| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum carburizing method and a vacuum carburizing device capable of suppressing production of soot and tar in the vacuum carburizing treatment and performing the carburizing treatment at a low cost. SOLUTION: In the vacuum carburizing method, a work 8 is carburized while feeding hydrocarbon gas thereto as a main carbon source under a vacuum atmosphere. In this condition, hydrocarbon gas used in the carburizing treatment is mixed with hydrocarbon gas to be fed. A recirculation line 6 or 106 to circulate gas to be exhausted from a carburizing chamber 1 again is provided in the vacuum carburizing device. COPYRIGHT: (C)2005,JPO&NCIPI
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