Abstract
Atmosphere heat treatments with CH4/H2 mixture were applied to a batch sinter furnace. After debinding the injection molded SKH51 powder compacts, the 5 pieces of those were deoxdized in an alumina box with H2 under 840°C. Those were carburized in CH4/H2 mixture at 900°C for 1 h and sintered in decompressed Ar at 1230-1260°C for 1 h. The homogeneous sintered bodies without distortion could be obtained. All the relative densities were over 99% of theoretical density. The carbon contents were uniform among all the specimens and proportional to the ratios of CH4/H2.
