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我们所进行的尿素软氮化试验,遵循了毛主席的“自力更生”方针,用的原料完全立足于国内,完全抛开了有剧毒、价贵及部份进口的氰盐. 我厂内燃机车气阀是用4Cr14Ni14W2M.奥氏体耐热钢制造的,它要进行氮化处理,同时我们也想用氮化来提高刀具使用寿命.我们同工人同志密切配合,研究决定采用软氮化,经过反复试验及生产实践取得了一些成效.现介绍如下. 一、尿素软氮化的简单原理尿素软氮化是由尿素、碳酸盐、氯化盐按一定比例配制成盐浴.当加热500～560℃时利用尿素与碳酸盐的化学反应,生成氰酸盐,氰酸盐并进一步分解出氮原子及碳原子而在钢件表面进行氮碳共渗,其化学反应式如下:
Our urea nitrogen nitriding test, follow Chairman Mao’s “self-reliance” approach, the use of raw materials based entirely on the country, completely aside the highly toxic, expensive and part of the imported cyanide. I plant diesel locomotive Valve is made of 4Cr14Ni14W2M. Austenitic heat-resistant steel, it is subject to nitriding, and we also want to use nitriding to improve tool life. We work closely with the workers comrades, the study decided to use soft nitriding, after Repeated experiments and production practices have achieved some results are described below. A simple urea nitrogen nitriding urea soft nitriding urea, carbonate, chloride salt by a certain proportion formulated into a salt bath when heated 500 ~ 560 ℃, the use of chemical reaction of urea and carbonate to generate cyanate, cyanate and further decomposition of nitrogen atoms and carbon atoms in the steel surface nitrocarburizing, the chemical reaction is as follows: