Application of low-pressure plasma-spray coatings.

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  • 減圧雰囲気中プラズマ溶射の応用
  • ゲンアツ フンイキチュウ プラズマ ヨウシャ ノ オウヨウ

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Abstract

The plasma spray process can be used to produce coatings on metals, ceramics, etc., and as a result of recent technical innovations, new plasma systems-the high-power plasma system and low-pressure plasma-spray coating (LPC) -have been introduced to the market. LPC makes it possible to spray in inert atmospheres, there by utilizing higher-velocity plasma jets and enlarging the high-temperature zone. Thus coatings are virtually free of oxides, pores and trapped dust, and high-density coatings can be produced, so that such high-quality coatings can be applied as hot corrosion protection or a thermal barrier on gas turbine parts. It is also possible to make a free-standing object by removing the substrate after spraying -a process known as spray casting -in which a material having new properties is produced through formation of a super saturated solid solution and micronization of particles of precipitate and crystals.

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