| 摘要 |
Hard metal composite body consisting of hard metals, a binder and an intercalated reinforcing material, and process for producing a hard metal composite body by powder metallurgical methods. A hard metal composite body which possesses improved toughness, hardness and breaking strength is obtained by incorporating monocrystalline reinforcing materials in whisker and/or lamina form composed of borides and carbides, and/or nitrides and/or carbonitrides of the Group IVa or Group Va elements or mixtures thereof, preferably provided with a coating inert to the binder metal phase, and/or a coated monocrystalline reinforcing material made of SiC, Si3N4, Si2N2O, Al2O3, ZrO2, AlN and/or BN. The hard metal composite body is produced by powder metallurgical methods. The deagglomerated and graded reinforcing material, possibly provided with a coating inert to the binder metal phase and deposited by CVD or PVD, is mixed with the ground mixture of hard metals and binders. It is then dried, granulated, pressed uniaxially or isostatically at low temperature, and subjected to sintering or combined or separate sintering/high-temperature isostatic pressing or to axial hot-pressing. The axial hot-pressing is preferably carried out when the content of the reinforcing material is greater than 20 vol. %. At lower contents, the other processes are preferred. |
