US5945167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing composite material
Assignee: Honda Motor Co Ltd
•
Filing: 1997-07-15
•
Granted: 1999-08-31
•
Expires: 2017-07-15
Abstract
Abstract A grain growth accelerator in a form dispersed in an aqueous solution or an organic solvent is introduced into a preliminarily fired body, and thereafter the preliminarily fired body is fired in a main firing process. In the main firing process, a volumetric diffusion of metal and grain growth of ceramic particles are caused as the firing temperature increases. Therefore, it is possible to manufacture a composite material which has such a gradient function that it is ceramic-rich on its surface and metal-rich in its inside, a high degree of surface hardness and toughness, and an interface-free structure.
Inventors
- 👤 Mitsuo Kuwabara
- 👤 Mitsuhiro Funaki
- 👤 Kazuhito Hiraga
- 👤 Tetsuya Ohishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:41
CPC Classifications
C; C22; C22C; C22C29/00; C22C1/00; C22C1/04; C22C1/05; C22C1/051; B; B22; B22F; B22F5/00; B22F2005/001; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
A method of manufacturing a metal-ceramic composite material, comprising the steps of: producing a molded body of a mixture of a powder of a ceramic and a powder of metal particles, wherein at least some of said metal particles are disposed adjacently to each other in said molded body so as to be in contact along contacting regions thereof; preliminary firing the molded body into a preliminarily fired body, the preliminary firing being conducted at a temperature and for a period of time sufficient to enable said contacting regions of said metal particles in said body to become fused together by volumetric diffusion while maintaining contiguous pores in said molded body; impregnating said preliminarily fired body with a solution of a metal salt containing a ceramic grain growth accelerator which comprises at least one of iron, manganese, chromium, and an organic metal salt, or an alloy thereof; and finally firing said preliminarily fired body to promote grain growth of the ceramic near the surface of said body to thereby produce a metal-ceramic composite body having a gradient in which the percentage of metal component of said composite body increases inwardly from a surface thereof.
Claim 2
Independent Claim
194 words
A method of manufacturing a metal-ceramic composite material, comprising the steps of: producing a molded body of a mixture of a powder of a ceramic and a powder of metal particles, wherein at least some of said metal particles are disposed adjacently to each other in said molded body so as to be in contact along contacting regions thereof; preliminary firing the molded body into a preliminarily fired body, the preliminary firing being conducted at a temperature and for a period of time sufficient to enable said contacting regions of said metal particles in said body to become fused together by volumetric diffusion while maintaining contiguous pores in said molded body; impregnating said preliminarily fired body with a solution of a metal salt containing a ceramic grain growth accelerator which comprises at least one of iron, manganese, chromium, and an organic metal salt, or an alloy thereof; and finally firing said preliminarily fired body to promote grain growth of the ceramic near the surface of said body to thereby produce a metal-ceramic composite body having a gradient in which the percentage of metal component of said composite body increases inwardly from a surface thereof.
Claim 3
Dependent Claim
18 words
The method according to claim 1, wherein said metal salt comprises a nitrate, an acetate, or a chloride.
Claim 4
Dependent Claim
27 words
The method according to claim 1, wherein said organic metal salt comprises at least one of iron, nickel, and cobalt, manganese, and chromium, or an alloy thereof.
Claim 5
Dependent Claim
39 words
The method according to claim 1, wherein during said step of producing the molded body, a load is applied to said mixture to produce said molded body, said load being lower than a range for elastically deforming said metal.
Claim 6
Independent Claim
212 words
A method of manufacturing a metal-ceramic composite material, comprising the steps of: producing a molded body of a mixture of a powder of a ceramic and a powder of metal particles, wherein at least some of said metal particles are disposed adjacently to each other in said molded body so as to be in contact along contacting regions thereof; preliminarily firing the molded body into a preliminarily fired body, the preliminary firing body being conducted at a temperature and for a period of time sufficient to enable contacting regions of said metal particles in said body to become fused together by volumetric diffusion while maintaining contiguous pores in said molded body; impregnating said preliminarily fired body with a solution of a metal salt containing a ceramic grain growth accelerator which comprises at least one of chromium, manganese, iron, nickel, and cobalt, or a mixture thereof; finally firing said preliminarily fired body to promote grain growth of the ceramic near the surface of said body to thereby produce a metal-ceramic composite body having a gradient in which the percentage of metal component of said composite body increases inwardly from a surface thereof; and forming a tip on said metal-ceramic composite body, thereby producing a composite body having a tip of cermet or carbide.
Claim 7
Independent Claim
212 words
A method of manufacturing a metal-ceramic composite material, comprising the steps of: producing a molded body of a mixture of a powder of a ceramic and a powder of metal particles, wherein at least some of said metal particles are disposed adjacently to each other in said molded body so as to be in contact along contacting regions thereof; preliminarily firing the molded body into a preliminarily fired body, the preliminary firing body being conducted at a temperature and for a period of time sufficient to enable contacting regions of said metal particles in said body to become fused together by volumetric diffusion while maintaining contiguous pores in said molded body; impregnating said preliminarily fired body with a solution of a metal salt containing a ceramic grain growth accelerator which comprises at least one of chromium, manganese, iron, nickel, and cobalt, or a mixture thereof; finally firing said preliminarily fired body to promote grain growth of the ceramic near the surface of said body to thereby produce a metal-ceramic composite body having a gradient in which the percentage of metal component of said composite body increases inwardly from a surface thereof; and forming a tip on said metal-ceramic composite body, thereby producing a composite body having a tip of cermet or carbide.
Claim 8
Dependent Claim
18 words
The method according to claim 5, wherein said metal salt comprises a nitrate, an acetate, or a chloride.
Claim 9
Dependent Claim
29 words
The method according to claim 5, wherein said organic metal salt comprises at least one of iron, nickel, and cobalt, manganese, and chromium and tungsten or a mixture thereof.
Claim 10
Dependent Claim
39 words
A method according to claim 5, wherein during said step of producing the molded body, a load is applied to said mixture to produce said molded body, said load being lower than a range for elastically deforming said metal.
References Cited (Backward Citations)
US3757878A
Cited
US3816081A
Cited
US4746363A
Cited
US4916029A
Cited
JPS6326346A
Cited
US4800065A
Cited
US5223195A
Cited
US5139720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-08-30 | 2003-03-01 | 2003-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-30 | 2007-03-01 | 2007-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-30 | 2011-03-01 | 2011-08-31 | $7700.00 | Window Closed / Lapsed |