与常规等离子喷涂相比,低压等离子喷涂技术在真空或低压下进行等离子喷涂,可制备更低杂质、更高致密度、更高结合强度的涂层. 介绍了常规等离子喷涂焰流速度高、工艺稳定性好、沉积效率高、可控性好的特点,详细阐述了低压等离子喷涂技术清洁、高速、长焰流、预热、电清理的工艺优势,说明了低压等离子喷涂技术在热障涂层、抗气蚀涂层、面向等离子体材料等功能性涂层制备上的应用,最后从完善相关理论、与其他技术联用、工艺在线可控、气氛压力更低等方面,以及在航空、航天、电子等领域的运用,对低压等离子喷涂技术的发展进行了展望.
Low pressure plasma spraying ( LPPS) is a plasma spraying process under vacuum or very low pressure,which pre-pares coatings with lower impurity content, higher density and higher bending strength compared to the coatings prepared by Air plasma spraying( APS) . This paper reviewed the characteristics of APS such as high flame speed, high stability, high deposition efficiency and good controllability, introduced the many technological advantages of LPPS, including clean spraying environment, high speed and long flame flow, auto-preheat and electric cleaning. This paper also reviewed the application of LPPS in some func-tional coatings, such as thermal barrier coating, anti-cavitation erosion coating and plasma facing materials. Furthermore, this pa-per forecasted the development trend of LPPS, including enriching related theory, combining with other technologies, on-line process control and a much lower atmosphere pressure, and its further application in aviation , aerospace, electronic and many oth-er fields.
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