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氮化在热处理行业中已成为常规工艺,其原理是氨气经加热分解后产生新生态氮原子与钢材表面金属原子结合,生成一种特别硬的硬化层(可达60HRC以上),从而使钢制零件表面提高耐磨性、耐腐蚀性,轴套类零件常用CrMoAl经氮化处理来提高其质量。 1.真空脉冲气体氮化工艺问题的提出 常规氮化在大暴露面上能较均匀地达到氮化目的。而对复杂零件小间隙内壁,往往氨气尚未进入缝隙,新生态氮原子就已与外暴露的金属原子结合而氮化,因此小间隙(或小孔)内壁用常规方法很难氮化。
Nitriding in the heat treatment industry has become a conventional process, the principle is the ammonia decomposition by heating the new nitrogen atoms and the surface of metal atoms combine to produce a particularly hard hardened layer (up to 60HRC above), so that the steel Parts surface to improve wear resistance, corrosion resistance, sleeve parts commonly used CrMoAl nitriding to improve its quality. 1. Vacuum pulse gas nitriding process proposed conventional nitriding in the large exposed surface can be more evenly to achieve the purpose of nitriding. However, for the small gap inner wall of the complex part, the ammonia gas often does not enter the gap, and the new ecological nitrogen atom has been combined with the exposed metal atoms to nitriding. Therefore, the inner wall of the small gap (or small hole) is hard to be nitrided by a conventional method.