US 2003/0195122 A1 · Composite body of silicon carbide and binderless carbon, process for producing such composite body, and article of manufacture utilizing such composite body for tribological applications

Abstract

A composite body of silicon carbide having binderless, allotropic carbon granules distributed throughout is produced. The nominal size of the binderless allotropic carbon granules can range from 5 to 500 micrometers. The concentration of the binderless allotropic carbon particles can vary from 1.0 to 35.0 weight percent. The process to produce such a composite body is to sinter silicon carbide with binderless, carbon-yielding precursor granules. The composite body is utilized in tribological applications. The dense, impervious silicon carbide-binderless carbon composite exhibits excellent physical and tribological characteristics when used as a mechanical face seal, a sliding bearing arrangement, or some other rubbing component.

Claims98

Dependent claims

A composite body of silicon carbide comprising:

a. sintered silicon carbide matrix formed by the pressureless self-sintering method;
and
b. binderless allotropic carbon granules distributed throughout the silicon carbide matrix.

A process for producing a composite body of silicon carbide comprising the steps of:

a. forming a mixture comprising:
i. liquid medium,
ii. silicon carbide,
iii. sintering aid,
iv. wetting agent,
v. anti-flocculant agent,
vi. carbon-yielding organic compound,
vii. temporary binder,
viii. organic lubricant, and
ix. binderless, carbon-yielding precursor granules, free of non-shrinking carbon;
b. pressing the mixture to form a consolidated body;
c. curing the consolidated body;
d. carbonizing the consolidated body;
and
e. sintering the consolidated body.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/122,293Filed 12 Apr 2002

Published

16 Oct 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification28 codes

C04B 35/6263
Wet mixtures: characterised by their solids loadings, i.e. the percentage of solids
C04B 35/565
Based on carbides or oxycarbides: based on silicon carbide
C04B 35/62655
Thermal treatment of powders or mixtures thereof other than sintering: drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
F16D 69/02
Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces: composition of linings ; Methods of manufacturing

Composite body of silicon carbide and binderless carbon, process for producing such composite body, and article of manufacture utilizing such composite body for tribological applications

Life of this patent

Composite body of silicon carbide and binderless carbon, process for producing such composite body, and article of manufacture utilizing such composite body for tribological applications

Life of this patent

Abstract

Claims98