公开(公告)号：US5158625A

公开(公告)日：1992-10-27

申请号：US680423

申请日：1991-04-04

申请人： Benoit Lhote ,  Philippe Queille ,  Jean-Pierre Zumbrunn ,  Eric Duchateau

发明人： Benoit Lhote ,  Philippe Queille ,  Jean-Pierre Zumbrunn ,  Eric Duchateau

IPC分类号： C21D1/18 ,  C21D1/613 ,  C21D1/767 ,  C21D1/773 ,  F27D17/00

CPC分类号： C21D1/613 ,  C21D1/767 ,  C21D1/773

摘要： Process for heat treating articles by hardening them in a recirculating gas medium which is in contact with the treated articles, the hardening gas being cooled by means of a heat exchanger, of the type in which helium is used as hardening gas, and is stored under holding pressure in a buffer container, wherein at the end of a hardening operation, a helium load is extracted from the treatment enclosure, in final phase by means of pump until a primary vacuum is obtained, the extracted helium is brought to purifying pressure by means of a compressor associated to a mechanical filter, and the helium under purifying pressure is sent to a purifier in which impurities are removed, after which it is transferred, if desired, after recompression in the buffer container.

摘要翻译： 通过在与处理物接触的再循环气体介质中硬化它们来进行热处理的方法，硬化气体通过热交换器被冷却，其中氦气用作硬化气体，并被储存在 在缓冲容器中保持压力，其中在硬化操作结束时，通过泵在最终阶段从处理外壳中提取氦负载，直到获得初级真空，通过装置将提取的氦气提纯到压力 与机械过滤器相关联的压缩机，并且将净化压力下的氦气送至其中除去杂质的净化器，然后如果需要，在缓冲容器中再压缩后将其转移。