Composite material

a technology of composite materials and materials, applied in the field of composite materials, can solve the problems of inability to efficiently form thin films, high cost of composite materials containing diamonds or c-bns, and poor oxidation resistance of composite materials, and achieve the effects of facilitating the growth of ceramic powder grains in multi-component systems, high strength, and increased relative density

Inactive Publication Date: 2004-02-26
HONDA MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
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Benefits of technology

0058] During the sintering process, the grain growth of the multi-component system ceramic powder is facilitated by the coating film (grain growth-facilitating agent). Therefore, the relative density is further increased. Accordingly, the obtained composite material exhibits the high strength and the high toughness.

Problems solved by technology

However, the composite material containing diamond or c-BN is not excellent in oxidation resistance.
Further, the composite material containing diamond or c-BN is expensive.
However, when the thin film is formed by means of the PVD method or the CVD method, it is impossible to efficiently form the thin film, because the reaction efficiency is low and the reaction velocity is slow.
For this reason, the production cost of the composite material becomes expensive.
Further, the size and the shape of a workpiece are restricted, because the reaction chamber of the PVD apparatus or the CVD apparatus has a predetermined volume.
Furthermore, the thin film is readily peeled off under a high stress.
As described above, if it is intended to realize a high hardness of the composite material, then the composite material is chemically unstable, and the production cost is expensive.

Method used

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Embodiment Construction

[0059] W--Ti--Nb--N--C system ceramic powder, W--Ti--Nb--Al--N--C system ceramic powder, W--Ti--Zr--Nb--Ta--Al--N-C system ceramic powder, or W-Ti-Zr-Hf-Nb-V-N-C system ceramic powder and Co powder were mixed at a variety of weight ratios. The multi-component system ceramic powder had an average grain size of 2.5 .mu.m, and the Co powder had an average grain size of 1.4 .mu.m.

[0060] Each of the mixed powders was compacted into a rectangular parallelepiped of 70 mm.times.20 mm.times.20 mm at a pressure of 150 MPa. Only the compact, which contained W--Ti--Nb--N--C system ceramic powder, was preliminarily sintered at 927.degree. C. for 15 minutes, and then a xylene solution dispersed with h-BN was spray-applied to the surface of the preliminarily sintered product. Further, the preliminarily sintered product was sintered by performing a sintering treatment in a nitrogen atmosphere at 1400 to 1500.degree. C. for 60 minutes to obtain a composite material. On the other hand, each of the ot...

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Abstract

A compact is obtained from a mixed powder of a multi-component system ceramics composed of constitutive elements of at least two metal elements selected from the group consisting of Ti, Al, V, Nb, Zr, Hf, Mo, Ta, Cr, and W, N, and optionally C; and Fe, Ni, Co, or an alloy composed of a constitutive element of at least one metal element of Fe, Ni, and Co. A composite material is prepared by sintering the compact.

Description

[0001] The present invention relates to a composite material comprising a metal and a multi-component system ceramics composed of constitutive elements of two or more metal elements, N, and optionally C.[0002] The composite material, which is produced by sintering metal particles and ceramic powder together, has the high toughness originating from the metal and the high hardness and the high strength originating from the ceramics. Such a composite material is widely used in a variety of fields. For example, the tungsten carbide-cobalt system cemented carbide obtained by sintering tungsten carbide and cobalt, and the titanium carbide system cermet obtained by sintering titanium carbide and molybdenum are adopted as the edge for the cutting tool. Such a composite material is further blended, for example, with niobium carbide in some cases.[0003] The composite material usually has a sufficient hardness. However, the composite material is sometimes required to have a higher hardness dep...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C1/05C22C29/04C22C29/16
CPCB22F2999/00C22C1/056C22C29/04C22C29/16B22F3/1007B22F2201/02
Inventor KUWABARA, MITSUOOHTSUKA, MASANORI
Owner HONDA MOTOR CO LTD
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