公开(公告)号：US4268323A

公开(公告)日：1981-05-19

申请号：US165002

申请日：1980-07-01

申请人： Thomas M. Jakubowski ,  William G. Wood

发明人： Thomas M. Jakubowski ,  William G. Wood

IPC分类号： C23C8/46 ,  C23C8/50 ,  C23C8/56 ,  C21D1/48

CPC分类号： C23C8/50 ,  C23C8/46 ,  C23C8/56

摘要： A process for case hardening steel is described. A fused bath of inert salt is maintained which bath is comprised of alkali or alkali earth halides, and alkali, or alkaline earth oxides or carbonates. To this fused bath is added urea, dicyanodiamide or pyrolysis/condensation products of urea or dicyanodiamide. This will form active ions containing carbon and/or nitrogen, and either the nitrogen and/or carbon will diffuse into the surface of a steel piece suspended in the bath to form either a nitride, carbonitride or carburized case depending upon the temperature of the bath, which is maintained between above 540.degree. C. and about 950.degree. C.

摘要翻译： 描述了表面硬化钢的方法。 保持惰性盐的熔融浴，该浴由碱金属或碱土金属卤化物以及碱金属或碱土金属氧化物或碳酸盐构成。 向该熔融浴中加入脲，二氰二酰胺或尿素或二氰基二酰胺的热解/缩合产物。 这将形成含有碳和/或氮的活性离子，并且氮和/或碳将扩散到悬浮在浴中的钢片的表面，以形成氮化物，碳氮化物或渗碳的情况，这取决于浴的温度 ，其保持在540℃至约950℃之间。