Title:
【発明の名称】硬質金属複合体およびその製造方法
Document Type and Number:
Japanese Patent JPH04502347
Kind Code:
A
Abstract:
PCT No. PCT/DE89/00740 Sec. 371 Date Jun. 10, 1991 Sec. 102(e) Date Jun. 10, 1991 PCT Filed Nov. 27, 1989 PCT Pub. No. WO90/07017 PCT Pub. Date Jun. 28, 1990.The invention relates to a composite hard metal body of hard material, a binder and embedded reinforcing material, as well as to a process for the production of the composite hard metal body by methods of powder metallurgy. In order to create a composite hard metal body with improved toughness under load, improved hardness and a lower fracture susceptibility, the invention proposes to build in monocrystalline, preferably needle-shaped and/or platelet-shaped reinforcing materials, coated with an inert layer with respect to the binder metal phase and consisting of borides and/or carbides, and/or nitrides and/or carbonitrides of the elements of Groups IVa or Va or mixtures thereof and/or coated monocrystalline reinforcing material of SiC, Si3N4, Si2N2O, Al2O3, ZrO2, AlN and/or BN. The composite hard metal body is produced by powder-metallurgical methods, whereby the reinforcing material in a deagglomerated and graded state, optionally coated by CVD or PVD with a layer which is inert with respect to the binder metal phase, is blended with the ground mixture of hard materials and binder, dried, granulated, uniaxially pressed or isostatically pressed at low temperatures and then the composite body is produced by sintering, respectively a combined or separate sintering/HIP-process or through axial hot-pressing. The axial hot-pressing is preferred in cases where the reinforcing material surpasses 20% by volume, under this level the other mentioned processes are preferred.
Inventors:
Dryel Claus
Kolaska Hans
Kolaska Hans
Application Number:
JP50012589A
Publication Date:
April 23, 1992
Filing Date:
November 27, 1989
Export Citation:
Assignee:
Krupp Vidia Gesellschaft Mito Beschlenktel Haftung
International Classes:
C22C29/02; C22C1/05; C22C29/00; C22C29/06; C22C29/08; C22C29/10; C22C29/16; C22C47/14; C22C49/08; C22C49/14; (IPC1-7): C22C1/05; C22C1/09; C22C29/02; C22C29/08
Attorney, Agent or Firm:
Mitsuyoshi Esaki (3 outside)