| 摘要 |
PURPOSE:To obtain a sintered compact having promoted sintering properties of Cr3C2 and improved corrosion resistance, thermal shock resistance, hardness, strength and fracture toughness, by adding a specific ratio of ZrB2, TiB2, TiC, SiC or TiN to Cr3C2 and burning the mixture. CONSTITUTION:A mixture consisting of 0.5-50wt.% one or more kind of ZrB2, TiB2, TiC and TiN and 99.5-50wt.% Cr3C2 is burned at >=1,600 deg.C to provide the aimed sintered compact. Cr3C2 having >=99% purity, <=5mu, especially 1mu average particle size is preferably used as the above-mentioned Cr3C2 and similarly a compound having >=99% purity and <=10mu, especially <=5mu average particle is preferably used as ZrB2, TiB2, TiC, SiC or TiN. Although a mixture of these fine powders are normally obtained by uniformly each blending a fine powder with a fine powder or these fine powders may be simultaneously pulverized and blended. The burning time is about 30min-10hr, but properly selected according to raw material composition and raw material grain size. Ordinary- pressure sintering and hot press sintering as well as HIP is effective as the sintering method. |
