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Journal articles on the topic 'Vacuum processing'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Krishnamurthy, N., and A. K. Suri. "Material processing with vacuum." Journal of Physics: Conference Series 114 (May 1, 2008): 012016. http://dx.doi.org/10.1088/1742-6596/114/1/012016.

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2

Korolev, A. A., S. A. Krayukhin, G. I. Maltsev, and E. S. Filatov. "SILVER CRUST PROCESSING BY VACUUM." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy, no. 4 (January 1, 2017): 21–29. http://dx.doi.org/10.17073/0021-3438-2017-4-21-29.

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3

Collins, Don. "Dry vacuum gains for processing." World Pumps 2009, no. 514 (2009): 26–29. http://dx.doi.org/10.1016/s0262-1762(09)70246-9.

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4

Govindaraju, M., Deepak Kulkarni, and K. Balasubramanian. "Multipurpose Vacuum Induction Processing System." Journal of Physics: Conference Series 390 (November 5, 2012): 012011. http://dx.doi.org/10.1088/1742-6596/390/1/012011.

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5

Golan, Gady, and Alex Axelevitch. "Progress in vacuum photothermal processing (VPP)." Microelectronics Journal 37, no. 5 (2006): 459–73. http://dx.doi.org/10.1016/j.mejo.2005.07.014.

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6

O’Hanlon, John F. "Contamination reduction in vacuum processing systems." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 7, no. 3 (1989): 2500–2503. http://dx.doi.org/10.1116/1.575885.

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7

Kim, Hyung-Taek, and Dae-Yeon Kim. "Simulation of Vacuum Characteristics in Semiconductor Processing Vacuum System by the Combination of Vacuum Pumps." Journal of the Korean Institute of Electrical and Electronic Material Engineers 24, no. 6 (2011): 449–57. http://dx.doi.org/10.4313/jkem.2011.24.6.449.

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8

Fedoseev, Alexander V., G. I. Sukhinin, Igor V. Yarygin, Victor G. Prikhodko, and Sergey A. Novopashin. "VACUUM PROCESSING OF GOLD-BEARING CLAY MATERIALS." Interfacial Phenomena and Heat Transfer 7, no. 2 (2019): 123–29. http://dx.doi.org/10.1615/interfacphenomheattransfer.2019030520.

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9

Goldin, B. A., V. E. Grass, and Yu I. Ryabkov. "Vacuum carbothermal processing of low-iron bauxites." Glass and Ceramics 55, no. 9-10 (1998): 323–25. http://dx.doi.org/10.1007/bf02694780.

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10

Kim, Hyung-Taek. "Simulation of Vacuum Characteristics by Applications of Vacuum Valves in Display Processing." Journal of the Institute of Webcasting, Internet and Telecommunication 12, no. 2 (2012): 77–83. http://dx.doi.org/10.7236/jiwit.2012.12.2.77.

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11

Pap, Andrea E., Csaba Dücső, Katalin Kamarás, Gábor Battistig, and István Bársony. "Heavy Water in Gate Stack Processing." Materials Science Forum 573-574 (March 2008): 119–31. http://dx.doi.org/10.4028/www.scientific.net/msf.573-574.119.

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The high reactivity of the free silicon surface and its consequence: the “omnipresent” native silicon dioxide hinders the interface engineering in many processing steps of IC technology on atomic level. Methods known to eliminate the native oxide need in most cases vacuum processing. They frequently deteriorate the atomic flatness of the silicon. Hydrogen passivation by a proper DHF (diluted HF) treatment removes the native silicon oxide without roughening the surface while simultaneously maintains a “quasi oxide free” surface in a neutral or vacuum ambient for short time. Under such circumstances the last thermal desorption peak of hydrogen is activated at around 480-500°C where the free silicon surface suddenly becomes extremely reactive. In this study we show that deuterium passivation is a promising technology. Due to the fact that deuterium adsorbs more strongly on Si surface than hydrogen even at room temperature, deuterium passivation does not need vacuum processing and it ensures a robust process flow.

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12

Ford, W. K., J. Anderson, G. V. Rubenacker, et al. "Physical processing effects on polycrystalline YBa2Cu3Ox." Journal of Materials Research 4, no. 1 (1989): 16–22. http://dx.doi.org/10.1557/jmr.1989.0016.

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The effect of heating YBa2Cu3Ox in vacuum to 600 °C has been studied using photoelectron spectroscopy and diamagnetic susceptibility measurements. Evidence of two chemically distinct copper and barium species is found in single phase samples at room temperature cleaned by gentle heating at 450 °C. Such annealing also increases the volume diamagnetic susceptibility of the samples which suggests that the preferred stoichiometry of growth does not lead to an optimum superconducting phase. Samples cleaned by vacuum scraping or ion bombardment reveal more amorphous XPS structure and are less indicative of bulk properties.

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13

Zhang, Danning, Dirk Heider, and John W. Gillespie. "Void reduction of high-performance thermoplastic composites via oven vacuum bag processing." Journal of Composite Materials 51, no. 30 (2017): 4219–30. http://dx.doi.org/10.1177/0021998317700700.

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In this study, void reduction mechanisms during oven vacuum bag processing of high-performance carbon fiber thermoplastic composites are investigated. Entrapped air exists within the prepreg tape and between layers during lay-up and must be removed during processing to achieve aerospace quality (<1% void content) Key void reduction mechanisms during oven vacuum bag processing include through-thickness air diffusion and in-plane flow to the laminate edges through the permeable interlayer regions created by the prepreg surface roughness. Interlayer permeability between unidirectional and cross-ply laminates is measured experimentally and is sufficiently high for effective air removal during oven vacuum bag processing. Thick 72-layer carbon fiber/PEEK (poly (ether ether ketone)) laminates were fabricated with oven vacuum bag process under different edge sealing conditions. Void reduction in the laminate with sealed perimeter is dominated by air diffusion through the entire laminate thickness, and the laminate exhibits very high void content levels after oven vacuum bag processing. In the laminates with edges open to vacuum, air diffusion through a single layer and flow through the permeable interlayer lead to essentially void-free laminates. The findings show the importance of the interlayer permeability and edge conditions on the void reduction, and demonstrate that low void content can be achieved in thick section thermoplastic composite laminates via cost effective oven vacuum bag processing.

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14

KOBAYASHI, Takichi, and Hisao HOJO. "Digital Data Processing for Quartz Friction Vacuum Gauge." SHINKU 37, no. 4 (1994): 403–10. http://dx.doi.org/10.3131/jvsj.37.403.

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15

Korolev, Alexey, Gennagy Maltsev, Konstantin Timofeev, and Vladimir Lobanov. "Processing of Antimony-tin Concentrates by Vacuum Distillation." Metal Working and Material Science 20, no. 1 (2018): 6–21. http://dx.doi.org/10.17212/1994-6309-2018-20.1-6-21.

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16

Soltan, O. I. A., and L. V. Anisimova. "Hydrothermal processing of oat grain with vacuum humidification." Khleboproducty 28, no. 10 (2019): 53–55. http://dx.doi.org/10.32462/0235-2508-2019-28-10-53-55.

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17

Korolev, A. A., G. I. Maltsev, K. L. Timofeev, and V. G. Lobanov. "SB-PB-AG ALLOY PROCESSING BY VACUUM DISTILLATION." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy, no. 6 (December 14, 2018): 20–30. http://dx.doi.org/10.17073/0021-3438-2018-6-20-30.

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18

Butler, Shane W., John V. Ringwood, and Niall MacGearailt. "Prediction of Vacuum Pump Degradation in Semiconductor Processing." IFAC Proceedings Volumes 42, no. 8 (2009): 1635–40. http://dx.doi.org/10.3182/20090630-4-es-2003.00267.

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19

Vershina, A. K. "Combined plasma-vacuum processing of wood-cutting tools." Surface Engineering and Applied Electrochemistry 45, no. 3 (2009): 246–51. http://dx.doi.org/10.3103/s1068375509030120.

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20

Dexin, C. X., H. B. Harrison, and G. K. Reeves. "Titanium silicides formed by rapid thermal vacuum processing." Journal of Applied Physics 63, no. 6 (1988): 2171–73. http://dx.doi.org/10.1063/1.341080.

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21

Hoagland, David, and Andrew George. "Continuous permeability measurement during unidirectional vacuum infusion processing." Journal of Reinforced Plastics and Composites 36, no. 22 (2017): 1618–28. http://dx.doi.org/10.1177/0731684417721660.

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22

Valente, M. "Perfluoropolyether vacuum fluids for safety in semiconductor processing." Vacuum 35, no. 10-11 (1985): 511–12. http://dx.doi.org/10.1016/0042-207x(85)90383-5.

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23

Teruel, M. Rocío, Purificación García-Segovia, Javier Martínez-Monzó, M. Belén Linares, and M. Dolores Garrido. "Use of vacuum-frying in chicken nugget processing." Innovative Food Science & Emerging Technologies 26 (December 2014): 482–89. http://dx.doi.org/10.1016/j.ifset.2014.06.005.

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24

Kim, Hyung-Taek, and Man-Jae Seo. "Simulation of Conductance Effects on Vacuum Characteristics of High Vacuum System for Semiconductor Processing." Journal of the Korean Institute of Electrical and Electronic Material Engineers 23, no. 4 (2010): 287–92. http://dx.doi.org/10.4313/jkem.2010.23.4.287.

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25

Liu, Yuan Yuan, Z. F. Chi, J. W. Wang, Hai Guang Zhang, and Qing Xi Hu. "Bubble Image Processing Algorithm and Application in Vacuum Casting Equipment." Key Engineering Materials 426-427 (January 2010): 260–64. http://dx.doi.org/10.4028/www.scientific.net/kem.426-427.260.

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Bubbles in the manufacturing process are common. The bubbles often lead to the decrease of the product’s surface quality and internal performance. This paper summarized the published researches and applications of the detection and processing for bubble images, of which the advantages and disadvantages were also presented. Based on the above mentioned results, this paper then proposed a new bubble image processing algorithm for vacuum casting process, in which the characteristics of the bubbles in vacuum casting process and the problems possibly caused in detail were analyzed. According to the characteristics of bubbles in vacuum casting process, an image processing algorithms was designed using Matlab. The simulation result showed the efficiency of the proposed algorithm.

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26

Rosso, Mario, Eva Dudrová, Marco Actis Grande, and Róbert Bidulský. "Wear Characteristics of Vacuum Sintered Steels." Materials Science Forum 672 (January 2011): 17–22. http://dx.doi.org/10.4028/www.scientific.net/msf.672.17.

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The present paper is focused on the wear characteristic of vacuum sintered Cr-Mo-[Mn]-[Cu] steels. The effect of chemical composition and the processing conditions in a vacuum furnace were evaluated. In such furnaces the cooling rate is generally determined by the pressure of the gas (N2) introduced into the chamber, the average cooling rates were calculated in the range of 1240°C to 400°C. The wear characteristics were analyzed as function of the processing and microstructures of the tested alloys through pin on disk test. Sintering of specimens in vacuum together with rapid cooling resulted in the formation of dominant martensitic microstructures with some small bainitic areas. The effect of both surface hardness and microstructure on the wear behaviour of the investigated steels shows the relation between the hardness and the wear rate. The influence of processing condition on the amount of martensite is also presented.

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27

Carolina Marotti, Ana, Maurício Ferrapontoff Lemos, Jonas Farias Santos, Letivan Gonçalves de Mendonça Filho, and Jakler Nichele. "Evaluation of Processing Parameters for Densification of Composite Propellants." Journal of Aerospace Technology and Management, no. 1 (January 21, 2020): 11–14. http://dx.doi.org/10.5028/jatm.etmq.72.

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The present work investigated the effects of varying two parameters of a pilot-scale composite propellant plant: the mechanical vibration and the vacuum level. The application of mechanical vibration to the casted mold after the end of mixing has improved the propellant density. On the other hand, the change of the vacuum level had no significant effect. Static firing tests showed an increase in the gas generation rate with the increase of the number of voids.

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28

Yue, Wei Wei, Yi Mei Song, Dong Bo Zhou, Cai Liao, and Dan Ping Liu. "The Optimization Design of Vacuum Chamber in Vacuum Electron Beam Welding Machine." Advanced Materials Research 490-495 (March 2012): 1699–703. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.1699.

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Chamber deformation in vacuum electron beam welding machine directly affects the processing precision of whole equipment.In order to further improve performance of the welding machine,by the use of the computer simulation software, the Chamber structure in some type of vacuum electron beam welding machine,was optimized designed. And the optimized results were verified in a actual vacuum chamber. The results of deformation measurement show that the vacuum chamber optimization design is successful.

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29

Cherevko, Aleksandr, Valeriy Mykhaylov, Оlga Mayak, Andrey Shevchenko, Svitlana Prasol, and Aziz Sardarov. "PERSPECTIVES OF VEGETABLE PRESSED SKINS PROCESSING AND USE IN FOOD INDUSTRY." EUREKA: Life Sciences, no. 1 (February 3, 2021): 37–43. http://dx.doi.org/10.21303/2504-5695.2021.001633.

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Vegetable concentrates contain in their composition dietary fibers, microelements, color-forming substances, allowing to use them as a replacer of a main substance in food products rather successfully. The authors propose a way of vegetables processing into vegetable semi-products. Vacuum drying of vegetable pressed skins using vibration is provided. The method of vegetables processing into vegetable concentrates on an example of carrot provides raw material separation in juice and pressed skin with further separate processing of each component. For realizing the proposed method, a technological production line of concentrates of vegetable raw materials, including developed and studied equipment: vacuum evaporating apparatus with a device for heating and mixing, vacuum vibration dryer has been developed. Experimental studies of a swelling degree, solubility and reproduction of vegetable pressed skins have proved an advantage of drying raw materials under the influence of vibration that confirmed the choice of process parameters. Vegetable pressed skins at using vibration and vacuum have a swelling degree by 120…170 % more than at the convection drying regime

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30

Le, Hoang, Cao-Son Nguyen, and Anh-Hoa Bui. "EXPERIMENTAL PROCESSING OF ULTRA-LOW CARBON STEEL USING VACUUM TREATMENT." Acta Metallurgica Slovaca 24, no. 1 (2018): 4. http://dx.doi.org/10.12776/ams.v24i1.1070.

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This paper presents experimental process of ultra-low carbon (ULC) steel using vacuum heat treatment. After adjusting the chemical compositions as desired, the ULC steel was casted into plate, hot-forged and cold-rolled to sheet of 1 mm thickness, finally annealed at 800<sup>o</sup>C. Microstructure, crystalline phase, non-metallic inclusions and mechanical properties of the ULC steels were characterized by optical microscopy, X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and tensile test. Under argon vacuum atmosphere, decarburization occurred and C contents of the treated steels were reduced to 36 and 40 ppm corresponding to the decarburizing rate of 84.2 and 82.4%, respectively. The vacuum induction melting is thought to accelerate the rate of carbon removal from liquid steel. Electromagnetic force was attributed to promote the decarburization due to increasing the mass transfer coefficient during vacuum treatment. The annealed steels obtained a good combination of the strength and ductility; the total elongations were 45.2 and 42.9 %, while the yield strengths were 199 and 285 MPa, respectively. The results indicated that the ULC steels have only ferrite phase, of which grains size were 30 µm in average. The relative volume of non-metallic inclusions in the ULC steels was calculated as 0.23 vol. %, resulting positive contribution in the mechanical properties.

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31

Slavyanskii, A. A., E. V. Semenov, N. N. Lebedeva, and S. T. Antipov. "Calculation of period processing solution syrup in vacuum apparatus." Proceedings of the Voronezh State University of Engineering Technologies, no. 4 (January 1, 2016): 233–37. http://dx.doi.org/10.20914/2310-1202-2016-4-233-237.

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32

YABE, Akira. "Organic Synthesis and Material Processing with Vacuum Ultraviolet Light." Review of Laser Engineering 19, no. 11 (1991): 1066–72. http://dx.doi.org/10.2184/lsj.19.11_1066.

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33

Navarro, M., S. S. Bruce, B. Carol Johnson, A. V. Murthy, and R. D. Saunders. "Vacuum processing technique for development of primary standard blackbodies." Journal of Research of the National Institute of Standards and Technology 104, no. 3 (1999): 253. http://dx.doi.org/10.6028/jres.104.018.

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34

Saito, Y., F. Naito, C. Kubota, et al. "Material and surface processing in J-PARC vacuum system." Vacuum 86, no. 7 (2012): 817–21. http://dx.doi.org/10.1016/j.vacuum.2011.01.017.

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35

O’Hanlon, John F. "Advances in vacuum contamination control for electronic materials processing." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 5, no. 4 (1987): 2067–72. http://dx.doi.org/10.1116/1.574921.

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36

Shirazi, M., and S. E. Belinski. "Vacuum mechatronics and self-contained manufacturing for microelectronics processing." IEEE Transactions on Components, Hybrids, and Manufacturing Technology 13, no. 3 (1990): 473–77. http://dx.doi.org/10.1109/33.58847.

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37

Bonge, N. J. "A design analysis of intelligent, articulated vacuum processing systems." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 3, no. 3 (1985): 523–25. http://dx.doi.org/10.1116/1.572985.

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38

Huajun, Dong, Feng Yu, Guo Yingjie, Duan Wenyu, and Guo Fangzhun. "Vacuum Switches Arc Images Pre–processing Based on MATLAB." MATEC Web of Conferences 35 (2015): 03006. http://dx.doi.org/10.1051/matecconf/20153503006.

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39

Centea, Timotei, and Steven R. Nutt. "Manufacturing cost relationships for vacuum bag-only prepreg processing." Journal of Composite Materials 50, no. 17 (2015): 2305–21. http://dx.doi.org/10.1177/0021998315602949.

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40

Akazawa, H., and J. Takahashi. "High-performance beamline for vacuum-ultraviolet-excited material processing." Review of Scientific Instruments 69, no. 1 (1998): 265–69. http://dx.doi.org/10.1063/1.1148507.

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41

Nicholas, Nathan, and Bryce Shaffer. "All-Metal Scroll Vacuum Pumps for Tritium Processing Systems." Fusion Science and Technology 76, no. 3 (2020): 366–72. http://dx.doi.org/10.1080/15361055.2020.1712988.

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42

Kaniadakis, G., and P. P. Delsanto. "Simulation of desorption effects in vacuum by parallel processing." Il Nuovo Cimento D 15, no. 8 (1993): 1123–31. http://dx.doi.org/10.1007/bf02451882.

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43

Muradov, N. Z., A. D. Guseinova, L. M. Mirzaeva, R. Yu Ganbarov, and M. I. Rustamov. "Destructive processing of vacuum resid on iron oxide catalysts." Chemistry and Technology of Fuels and Oils 24, no. 4 (1988): 151–54. http://dx.doi.org/10.1007/bf00725186.

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44

BĒRZIŅŠ, AIVARS, MARGARITA TERENTJEVA, and HANNU KORKEALA. "Prevalence and Genetic Diversity of Listeria monocytogenes in Vacuum-Packaged Ready-to-Eat Meat Products at Retail Markets in Latvia." Journal of Food Protection 72, no. 6 (2009): 1283–87. http://dx.doi.org/10.4315/0362-028x-72.6.1283.

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Nine groups of different retail ready-to-eat vacuum-packaged meat products from 10 Baltic meat processing plants were analyzed for presence and numbers of Listeria monocytogenes at the end of shelf life. A total of 38 (18%) of 211 samples tested positive for L. monocytogenes serotype 1/2a (88%) or 1/2c (12%). The prevalence of L. monocytogenes in cold-smoked, sliced, vacuum-packaged beef and pork products (42%) was significantly higher than in cooked, sliced, vacuum-packaged meat products (0.8%) (P &lt; 0.001). Enumeration of L. monocytogenes showed that 84% of the positive samples contained &lt;100 CFU/g upon expiry of product shelf life. The numbers of L. monocytogenes exceeded 100 CFU/g only in cold-smoked, sliced, vacuum-packaged beef products. Identical pulsed-field gel electrophoresis types were recovered from different production lots of cold-smoked vacuum-packaged beef and pork products produced by the same meat processing plant, demonstrating L. monocytogenes contamination as a recurrent problem within one meat processing plant.

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45

Tanji-Suzuki, Haruka, Wenlan Chen, Renate Landig, Jonathan Simon, and Vladan Vuletić. "Vacuum-Induced Transparency." Science 333, no. 6047 (2011): 1266–69. http://dx.doi.org/10.1126/science.1208066.

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Photons are excellent information carriers but normally pass through each other without consequence. Engineered interactions between photons would enable applications as varied as quantum information processing and simulation of condensed matter systems. Using an ensemble of cold atoms strongly coupled to an optical cavity, we found that the transmission of light through a medium may be controlled with few photons and even by the electromagnetic vacuum field. The vacuum induces a group delay of 25 nanoseconds on the input optical pulse, corresponding to a light velocity of 1600 meters per second, and a transparency of 40% that increases to 80% when the cavity is filled with 10 photons. This strongly nonlinear effect provides prospects for advanced quantum devices such as photon number–state filters.

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46

Pabo, Eric F., Christoph Floetgen, Bernhard Rebhan, and Razek Nasser. "Advances in Aligned Wafer Bonding Enable by High Vacuum Processing." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2016, DPC (2016): 000488–541. http://dx.doi.org/10.4071/2016dpc-ta33.

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High volume aligned wafer bonding processes typically separate the wafer to wafer alignment process from the wafer bonding process and this wafer to wafer alignment is normally done in an ambient atmosphere. While this process flow has worked well and enabled the proliferation of MEMS devices in the last decade, it does have limitations. The primary issue is the exposure to water vapor and ambient atmosphere which limits the preprocessing that can be done and maintained on the wafers to be bonded. Performing the wafer to wafer alignment, handling, and wafer bonding in a high vacuum environment allow specialized preprocessing of the wafers prior to alignment and bonding. The most basic preprocessing enabled by this high vacuum environment is the open face dehydration bake of wafers prior to alignment to alignment and bonding. When done in a cluster tool, a chamber can be dedicated to baking out the wafers to minimizing the effect of outgassing on the final vacuum level in the MEMS device. If one wafer needs a high temperature bakeout and getter activation and one wafer is limited to a low temperature bakeout this is possible by using two chamber in the cluster tool – one for the high temperature backout and one for the low temperature bakeout. Microbolometers that use vanadium oxide as the sensor layer are an example of a device needing high and low temperature bakeout. Another preprocessing enabled by the high vacuum cluster tool is a surface treatment which removes oxides from the surface, increases the surface energy, and enables the formation of covalent bonds at room temperature in the case of Si-Si bonding. This low temperature covalent bond has been shown to have an oxide free interface with a minimized amorphous layer as well as very low metal contamination. Also, because the bonding is done at or near room temperature it is possible to bond materials with substantially different CTES such a GaN to SiC This new technology will enable improved vacuum encapsulation as well as the manufacture of new, high performance engineered substrates. The latest process results as well as process flows and required equipment capabilities will be presented.

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47

Tyrin, V. G., G. A. Mysova, K. N. Biryukov, et al. "JUSTIFICATION OF DESTRUCTION MODES OF ORGANIC LIVESTOCK AT THERMAL DRYING IN VACUUM." Problems of Veterinary Sanitation, Hygiene and Ecology 1, no. 1 (2019): 68–73. http://dx.doi.org/10.36871/vet.san.hyg.ecol.201901011.

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The article scientifically substantiates the modes of disinfection of organic waste on the basis of litter in the thermal method of their processing in vacuum. Experiments on the determination of the modes of disinfection of organic animal waste during their thermal processing method were carried out in a drying chamber Vacuum EcoDry loaded with prepared initial organic substrate into which test objects contaminated with suspensions of various groups of microorganisms: E. coli, S. aureus – 209 P, an atypical strain of mycobacteria B-5 and B. cereus. The results were evaluated by the survival of the test cultures after vacuum heat treatment (drying) of organic waste. Disinfection of organic animal waste during the technological process of vacuum drying is achieved at an installation temperature of 75 °C and more, at humidity of 75-80 mm Hg, an exposure of at least 50 minutes and allows you to get safe in the sanitary relation of the product of their processing.

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48

Suleymanova, L. A., A. S. Kolomatsky, and M. V. Marushko. "Processing Methods Used to Create High-Quality Porous Structure of Aerated Concrete." Materials Science Forum 992 (May 2020): 212–17. http://dx.doi.org/10.4028/www.scientific.net/msf.992.212.

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The efficiency of porous structure formation in aerated concrete can be improved by including the methods of thermal vacuum compaction or thermal vacuum compaction with vibration into the process as a means of creating high-quality composite cellular concrete. A graphic model of a phase composition change in the aerated concrete mix was developed allowing for an evaluation of the recipe and the mode of bubble porosity generation during hardening. This provides a control over the manufacturing processes and helps to produce aerated concrete with the specified porosity balance, which defines product properties.The effect of temperature and vacuum on molding sand during the initial stage of manufacture is proportional to the bubble porosity volume, which is important for a high-quality porous structure formation. In addition to the above, account must be taken of the combined effect of temperature, vacuum and volume ratio of phases in the base mix when using the proposed methods.Introduction of the developed processing methods into the manufacturing process improves the technology of aerated concrete production and allows for a fabrication of the finest advanced heat insulating and structural and heat insulating products.

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49

Banerjee, Satyajit, and Claus J. Joens. "Sintering Powder Metal Injection Molded (MIM) Titanium Alloys: In Vacuum or Argon?" Key Engineering Materials 704 (August 2016): 113–17. http://dx.doi.org/10.4028/www.scientific.net/kem.704.113.

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Titanium alloys processed by the powder metallurgy route (PM) are sintered in vacuum, the higher the better. This philosophy is carried over to MIM titanium alloys. In the MIM process a large amount of out gassing of binders takes place, which affects the vacuum level and hence the interstitial element pick up in the titanium. In this paper the effect of gaseous material in vacuum is discussed and an alternate method of debinding and sintering in argon is proposed. Three processing conditions are applied to MIM tensile bars made from Ti-6-4 materials. First they are debound and sintered under high vacuum, second debound under argon and sintered in high vacuum and third debound and sintered in flowing argon. The physical properties and interstitial element contents are presented and the effects of the material structures due to different processing on the properties are discussed.

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Tang, Rongfeng, Xiaomin Wang, Chenhui Jiang, et al. "Vacuum assisted solution processing for highly efficient Sb2S3 solar cells." Journal of Materials Chemistry A 6, no. 34 (2018): 16322–27. http://dx.doi.org/10.1039/c8ta05614e.

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Abstract:

Vacuum assisted solution processing is capable of fabricating Sb<sub>2</sub>S<sub>3</sub> films with high surface coverage, high crystallinity and phase purity, leading to a high power conversion efficiency of 6.78%.

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