| 摘要 |
PCT No. PCT/EP96/05452 Sec. 371 Date Jun. 26, 1998 Sec. 102(e) Date Jun. 26, 1998 PCT Filed Dec. 5, 1996 PCT Pub. No. WO97/22427 PCT Pub. Date Jun. 26, 1997The invention relates to the field of ceramic and hard metal industries and concerns a process for manufacturing hard metal parts, in particular those having a complex geometry, such as those used for example as machining tools and wear elements. The object of the invention is to create a process which allows the manufacture of hard metal parts with a complex geometry by using a stable dispersed hard metal-binder suspension, wherein the binder is a thermoplastic binder having a viscosity of 3 to 6 mPa s, and without using an organic solvent to eliminate the binder. For that purpose, a process is disclosed wherein a hard metal powder having an average grain size smaller than 2.0 mu m is mixed with a liquefied thermoplastic binder, with viscosity of the mixture being set upon a value of at least 100 mPa s and up to 4,000 mPa s during the whole production and treatment process. The thus obtained stable dispersed suspension is shaped into a molded body from which the thermoplastic binder is then expelled and the binder-free shaped body is then sintered. |
