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Dissertations / Theses on the topic 'Plasma Transferred Arc (PTA)'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Benegra, Marjorie. "Desenvolvimento \"in situ\" de aluminetos de níquel por plasma por arco transferido resistentes à oxidação." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-25102011-175019/.

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O presente trabalho objetiva o desenvolvimento in situ por plasma por arco transferido (PTA) de aluminetos de Níquel resistentes à oxidação, baseados em uma liga NiCrAlC referência. Para tanto, foram depositadas misturas preliminares de pós elementares e também utilizando o pó atomizado, variando somente a intensidade de corrente (130 e 160 A) para se obter diferentes misturas com o substrato. Após as deposições, a incorporação de elementos do substrato nos cordões não permitiu a formação de aluminetos para os revestimentos processados com a mistura de pós elementares. Estes apresen

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2

Pristavita, Ramona. "Transferred arc production of fumed silica : rheological properties." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99787.

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The thermal plasma production of fumed silica in a transferred arc consists of the decomposition of quartz to SiO (g) and oxygen followed by an oxidizing quench back to SiO2. The particles formed have diameters of the order of 10 to 20 nm and are linked in a three dimensional branched chain aggregate. Previous work by Addona and Munz (1999) demonstrated the technical feasibility of producing fumed silica using this method, but was unable to demonstrate the special rheological properties of the powder. The most important characteristic of fumed silica is the presence of hydroxyls on the surface

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3

Westhoff, Richard. "Modeling the non-transferred arc plasma torch and plume for plasma processing." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13239.

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4

Moura, Francisco José. "Vapour phase synthesis of AIN using a transferred arc plasma system." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41728.

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This work introduces a new concept for the synthesis of ultrafine aluminum nitride powder. A transferred arc plasma torch of 6.5 kW was used as a heat source to vaporize an aluminum ingot as a source of aluminum vapour for the synthesis of aluminum nitride outside the plasma chamber. The aluminum vapour produced in the plasma chamber was carried by the argon plasma gas to a tubular synthesis reactor where it reacted with ammonia injected radially. The effects of arc current, arc length and argon flow rate on the aluminum evaporation rate and the gas temperature reached in the mixing zone were

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5

Gans, Ira. "The production of ultrafine silica particles through a transferred arc plasma process /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65464.

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6

Tsantrizos, Panayotis G. "The characteristics of titanium tetrachloride plasmas in a transferred-arc systems /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75670.

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A stable transferred arc was produced with plasmagas containing up to 20 percent molar TiCl$ sb4$ in argon, helium and argon/hydrogen mixtures. This was achieved by replacing the commonly-used thoriated tungsten cathode tip with a tantalum carbide tip. Thus, corrosive reactions at the cathode surface, which were shown to be the cause of the observed instability, were prevented. This allowed the characteristics of stable titanium tetrachloride plasmas in a transferred arc reactor to be investigated.<br>Furthermore, an investigation was conducted into the feasibility of collecting titanium metal

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7

Silla, Vittorio. "The treatment of Li-ion battery waste in a transferred arc plasma reactor /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82634.

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In the new millennium, over 500 million rechargeable battery operated and miniaturized pieces of electronic equipment will be in circulation. A battery market survey showed that the average annual growth rate of Li-ion batteries will increase by 118%. The millions of spent Li-ion batteries will cause an environmental waste management problem. The cathode metals, which have a high market value (54 US$/kg cobalt) will leach into the earth when land filled.<br>A transferred arc process was proposed in which the Li-ion battery waste would be separated into volatile, slag and metal phases usi

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8

Liao, Xiaohong. "The synthesis of nano titania particles using a DC transferred arc plasma reactor." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104690.

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The effect of quench conditions on the properties of titanium dioxide produced using atransferred arc process was studied. Rutile phase TiO2 in the form of micron sized powder wasdecomposed and vaporized in a continuous feed DC transferred arc system. The hot gas streamexiting the reactor contained a mixture of the decomposition products of titania includingtitanium suboxides (TiO, Ti2O3), argon (Ar), and oxygen (O2). Rapid quenching of this gasstream with dry air resulted in the production of a titania aerosol. Collection of the product tookplace in the filtration system. The quench condition

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9

Chin, Earle J. "Carbothermic reduction of pyrochlore and niobium pentoxide in a transferred arc plasma : a thesis." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75989.

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The carbothermic reduction of pyrochlore and niobium pentoxide was studied, with and without the addition of iron as a solvent, in an argon transferred-arc plasma with a single stationary pellet reactor system. A conversion-time model, based on experimental and theoretical studies, was proposed to describe the carbothermic reduction reaction systems. The experimental results confirmed the applicability of the model.<br>The carbothermic reduction of pyrochlore and niobium pentoxide were studied in the temperature range 1530-2440 and 1625-2855 K, respectively. The rate was independent of particl

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10

Parisi, Paul Joseph. "Heat transfer and particulate feeding to a cylindrical enclosure in the presence of a plasma transferred-arc." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75781.

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The radiation heat transfer from an argon and a nitrogen transferred-arc column to a cylindrical enclosure was measured. The rate of heat transfer was successfully correlated in a non-dimensional manner, with respect to the arc length within the enclosure and the enclosure diameter for the section of the arc column located within the enclosure, and with respect to the arc length outside the enclosure and the enclosure diameter for the section of the arc column outside the enclosure.<br>It was discovered that tangential injection of a particulate feed material into the cylindrical enclosure led

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11

Chen, GangQiang. "Vitrification of simulated medium and high level Canadian nuclear waste in a continuous transferred arc plasma melter." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70289.

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A 40 kW transferred arc plasma melter was designed and built for the vitrification of nuclear waste. Borosilicate glass, high silica glass and sphene glass-ceramic were successfully melted with the waste using an argon plasma in both batch and continuous transferred arc plasma melters.<br>The use of both direct heating and indirect heating were examined in the continuous plasma melter. The loss of total glass weight and the elemental losses of Na, Cs, U and Nd were examined as a function of operating conditions. The losses of Cs during melting were from 25 to 73 wt% and depended on operating c

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12

Nady, Abdeljalil. "Caractérisation par diffraction des neutrons et rayonnement synchrotron de revêtement épais à base de cobalt obtenu par le procédé plasma à arc transféré." Reims, 2009. http://theses.univ-reims.fr/exl-doc/GED00001112.pdf.

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Le but de cette étude est de réaliser des dépôts à base de cobalt par projection métallique dans le domaine du forgeage. L’objectif à atteindre, pour rentabiliser le procédé au niveau industriel, est l’obtention d’un revêtement épais dont les conditions de déposition sont meilleures permettant de réaliser des revêtements homogènes exempt de fissures et de porosités. Un plan d’expérience de micrographie et de texture a permis de sélectionner, parmi les échantillons réalisés par différents procédés, ceux qui présente la bonne homogénéisation, un taux de dilution réduit et une zone affectée therm

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13

Yeh, Wei-Ting, and 葉威廷. "Microstructure and Corrosion Behavior of Dissimilar Gas Tungsten Arc Welding and Plasma Transferred Arc Overlay and Plasma Transferred Arc Overlay Weld between A508 and Inconel 52M." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/nqsj8d.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>105<br>In this study, cladding layer of Inconel 52M was deposited on A508 substrate material. Several layers and passes of Inconel 52M were welded on the surface of A508 by Half Weld-bead method using two welding processes namely GTAW and PTAW. Different welding methods and different welding parameters were found to have some effects on the microstructure of both the substrate material (A508) and the cladding layer (Inconel 52M). Dynamic potential test was carried out using 3.5 wt.% NaCl to check corrosion resistance on the cladding layer of Inconel 52M in comparison

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14

Wolfe, Tonya Brett Bunton. "Homogeneity of metal matrix composites deposited by plasma transferred arc welding." Phd thesis, 2010. http://hdl.handle.net/10048/1108.

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Thesis (Ph. D.)--University of Alberta, 2010.<br>Title from pdf file main screen (viewed on July 8, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Materials Engineering, Department of Chemical and Materials Engineering, University of Alberta. Includes bibliographical references.

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15

Lin, Hung-Mao, and 林宏茂. "Wear Characteristics of Cobalt-Base Superalloy Melted by Plasma Transferred Arc." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/58682864186818194987.

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碩士<br>國立成功大學<br>材料科學(工程)學系<br>86<br>The surface overlaying treatment is aimed to give different special properties to surfaces and substrates of materials. Microhardness, wear-resistance, corrosion-resistance etc. can be enhanced after treatment. Due to superior mechanical properties, spheroidal graphite (SG) cast irons are widely used in industries such as machine production, automobile components etc. These components generally need to have surfaces with higher microhardness to increase w

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16

Lin, Liang-Tung, and 林亮東. "Microstructural characterization of tungsten hardfacing of stainless steel by plasma transferred arc welding." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9at5p3.

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碩士<br>國立虎尾科技大學<br>材料科學與工程系材料科學與綠色能源工程碩士在職專班<br>104<br>The aim of this study was to evaluate the influence of ferritic stainless steel on mechanical and microstructural properties of tungsten powder plasma transferred arc hardfacing. The independently controllable process parameters were identified based on their significant effect on weld bead geometry were welding speed, welding current, plasma gas flow rate, powder feed rate and nozzle to workpiece distance. The working ranges of all selected parameters were fixed except welding speed. The results indicated that the hardness values were more

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17

CHEN, ZHI-MING, and 陳志明. "A study on surface alloying of high-Mn steel by plasma transferred Arc melting." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/30761091523663201547.

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18

Chuang, Chao-Tung, and 莊朝棟. "A Study on the Solidification Structure of Cast Iron Remelted by Plasma Transferred Arc Process." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/97864177163923599904.

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19

Deuis, Robert Leslie. "Aqueous corrosion and tribological properties of metal matrix composite coatings produced by plasma transferred arc surfacing." 1997. http://arrow.unisa.edu.au:8081/1959.8/80086.

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20

CHENG, JIN-BAO, and 程金保. "A study on interface microstructure and properties ofsome plasma transferred arc overlays on spheroidal graphite cast iron." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/19117750840199353446.

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21

Dai, Wen-Shyong, and 戴文雄. "A Study on the Plasma-Transferred-Arc Surface Modification and Silica Sand Erosion of Graphite Cast Irons." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/60430177688007528559.

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博士<br>國立成功大學<br>材料科學及工程學系<br>88<br>The mechanical properties of flake graphite and spheroidal graphite cast irons are influenced by graphite distributions and matrix structures. These two metallurgical factors were used as important variables for discussing the erosion behavior of graphite cast irons in this study. Besides, in order to realize the surface modification effects on the erosion resistance, plasma transferred arc (PTA) process was used to remelt the surfaces of graphite cast irons. The remelted surface layers of different solidification structures were obtained by varying the PT

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22

CHEN, WEI-REN, and 陳維仁. "Study on Microstructural and Mechanical Properties of Plasma Transferred Arc Cladding of Chromium Powder on Titanium Alloy." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/c9tb5s.

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碩士<br>國立虎尾科技大學<br>材料科學與工程系材料科學與綠色能源工程碩士班<br>106<br>In this study, chromium powder was cladded on the surface of Ti-6Al-4V alloy by the plasma transfer arc process, and heat input was controlled by welding parameters. In stationary conditions the other parameters, changing powder filler and presence or absence of different doped current parameters. The performance of cladded material was evaluated by microstructure and mechanical properties tests. The results showed that the microstructure of Ti-6Al-4V in general consists of equiaxed α enclosed by β phase. During cooling, β phase transformed to

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23

Chan, Wai-Sing, and 陳偉聲. "Overlaying Characteristics of Cobalt-Base Superalloy Formed on Spheroidal Graphite Cast Iron by Plasma Transferred Arc Melting Process." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/97299387388451847426.

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博士<br>國立成功大學<br>材料科學(工程)研究所<br>84<br>The purpose of this study is to overlay an alloy with high wear and corrosion resistant on SG cast irons in order to widen its application. Stellite 1,6 and 21 alloys were overlaid on SG cast irons with various carbon and silicon contents by plasma trans- ferred arc process. Furthermore, tearing property of the speci- mens after overlaying were also invertigated. Results revealed that the variation of the carbon and silicon contents has no

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24

曾昭景. "A study of surface modification of high-chromium white cast irons by powder plasma transferred arc melting method." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/11526608845308919718.

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25

Feng, Yi-Qun, and 馮軼群. "The Effects of Synchronous Vibration on Microstructural Evolution and Mechanical Property of Workpiece Deposited by Continuous Plasma Transferred Arc Additive Manufacturing." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/10455608586599218619.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>105<br>Plasma transferred arc (PTA) is one of the additive manufacturing technique. In this study, the PTA process with synchronous vibration was applied to clad AISI 316L and AISI M2 pieces. Different vibration frequencies were applied during cladding process. The microstructure, residual stress, tensile strength and hardness of clad pieces were examined and discussed. For the AISI 316L clad piece, the residual stress of clad piece with vibration was lower than that without vibration. The frequency which had the highest reduction rate 34.2% was the resonant. Also

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26

Xu, Wen-Nong, and 許文濃. "A study on the effects of grain size and silicon content on the characterisics of surface modification for spheroidal graphite cast iron by plasma transferred arc melting." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/88883323965580918705.

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27

Chen, Yi-Siou, and 陳毅修. "Effect of Cryogenic Treatment on Microstructural Characteristics and Corrosion Behavior of High-Chromium Cast Iron Coating on Spheroidal Graphite Cast Iron Deposited by Plasma Transferred Arc Process." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/89849281870265010959.

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碩士<br>遠東科技大學<br>機械工程研究所<br>103<br>Spheroidal graphite (SG) cast iron and medium carbon steel with high chromium cast iron surface coating are mainly used in wear rings, finishing rolls of hot rolled flat products, forming molds, furnace liners, cement crushers and grinding balls in mining and ducting equipment etc. Since these components may encounter problems such as abrasive wear, erosive wear and corrosion in the aforementioned applications, a common method for enhancing strength and hardness of these wearable components is the plasma transferred arc (PTA) overlaying process for surface mod

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