Composite construction and manufacturing method thereof

Details Composite construction and manufacturing method thereof Composite construction and manufacturing method thereof

2005-04-12

2005-04-12

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S312200, C428S472000, C428S697000, C428S698000, C428S699000

Reexamination Certificate

active

06878434

ABSTRACT:
A composite construction1is obtained by coating the outer periphery of a core material2with a shell layer3.The core material2is composed of a first sintered body that is obtained by bonding, with a binder metal, a first hard particle composed of one or more of carbides, nitrides and carbonitrides of metals of Groups 4a, 5a and 6a of the Periodic Table, or a first ceramics obtained by bonding, with a sintering additive, a first ceramic particle composed of at least one of oxides, carbides, nitrides and carbonitrides selected from the group consisting of metals of Groups 4a, 5a and 6a of the Periodic Table, Al, Si and Zn. The shell layer3is composed of a second hard sintered body or second ceramics having a different composition from the first hard sintered body. The ratio of the residual free carbon amount Cinin the core material2to the residual free carbon amount Coutin the shell layer3,Cin/Cout, is 0.5 to 2. This prevents shrinkage during the time of sintering and also prevents the strength of the composite construction from lowering due to poor sintering.

REFERENCES:
patent: 4770935 (1988-09-01), Yamamura et al.
patent: 5645781 (1997-07-01), Popovic'
patent: 6063502 (2000-05-01), Sue et al.
patent: 6607835 (2003-08-01), Fang et al.

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