等离子粉末堆焊是以等离子弧作为热源，应用等离子弧产生的高温将合金粉末与基体表面迅速加热并一起熔化、混合、扩散、凝固，等离子束离开后自激冷却，形成一层高性能的合金层，从而实现零件表面的强化与硬化的堆焊工艺。
本文主要对一种具有新的送粉方式——阴极内送粉的等离子堆焊枪的结构和性能进行了一定的探讨。
The main purpose of this paper is to introduce the structure and functions of plasma powder surfacing gun with cathode powder feeding.
就阀门密封面等离子弧堆焊的技术关键问题：毛坯加工、工艺选择及质量控制等。
The key problems of technique for plasma hardfacing for sealing face of valve such as blank making. Process selecting and quality controlling.
详细介绍了堆焊、激光熔覆、激光熔射、等离子熔化-注射等颗粒增强表层复合材料的制备方法，并分析了各种制备技术的优缺点。
Hardfacing, laser cladding, laser melt injection and plasma melt injection were introduced, and the virtues and defects of all the methods were discussed.
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