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Method for Fabricating Ultrahigh Temperature Carbide/Metal Composites by Reaction Sintering

IP Title

Reaction Sintered Zirconium Carbide/Tungsten Composite Bodies and a Method of Producing Same

Detailed Technology Description

None

Supplementary Information

Patent Number: US7648675B2
Application Number: US2006539384A
Inventor: Zhang, Shi C. | Hilmas, Gregory E. | Fahrenholtz, William G.
Priority Date: 6 Oct 2006
Priority Number: US7648675B2
Application Date: 6 Oct 2006
Publication Date: 19 Jan 2010
IPC Current: C22C000105
US Class: 419017
Title: Reaction sintered zirconium carbide/tungsten composite bodies and a method for producing the same
Usefulness: Reaction sintered zirconium carbide/tungsten composite bodies and a method for producing the same
Novelty: Method of sintering transition metal carbide and transition metal matrix composite, involves blending transition metal oxide powder with transition metal powder, forming powder into green component and heating green component

Industry

Environmental/Green Technology

Sub Category

Solar Cell

Application Date

Oct 6, 2006

Application No.

7,648,675

Others

*Abstract

ABSTRACT OF THE DISCLOSURE U.S. PATENT APP 11/539,384 - Reaction Sintered Zirconium Carbide/Tungsten Composite Bodies and a Method for Producing the Same: A method of sintering a composite body characterized by a transition metal carbide phase (such as a ZrC phase) substantially evenly distributed in a second, typically refractory, transition metal (such as W) matrix at ambient pressures, including blending a first predetermined amount of first transition metal oxide powder (such as ZrO2) with a second predetermined amount of second transition metal carbide powder (such as WC powder). Next the blended powders are mixed to yield a substantially homogeneous powder mixture and a portion of the substantially homogeneous powder mixture is formed into a green body. The body is fired to a first temperature, wherein the first transition metal oxide is substantially reduced and the simultaneously generated CO and gas are evolved from the body to substantially eliminate oxides from the green body, and the body is heated to a second temperature and sintered to yield a composite body of about 99 percent theoretical density and characterized by a first transition metal carbide phase distributed substantially evenly in a second transition metal matrix.Non-Confidential Abstract of Invention: This invention comprises a reaction sintering method to produce a composite consisting of an ultrahigh temperature transition metal carbide (e.g., ZrC, HfC, TaC, etc.) bonded by an ultrahigh temperature transition metal (e.g., W). More specifically, this invention consists of forming a precursor mixture of a transition metal carbide (e.g., WC) with a transition metal oxide (e.g., ZrO2). The precursor mixture is subsequently reaction sintered under sufficient time, temperature, and atmospheric conditions so as to convert the precursor transition metal oxide to a transition metal carbide, convert the transition metal carbide into a transition metal, while eliminating the undesirable oxide to produce an ultrahigh temperature transition metal carbide/transition metal composite.

*IP Issue Date

Jan 19, 2010

*IP Publication Date

Nov 26, 2009

*Principal Investigator

Name: Shi Zhang, Research Engineer

Department:

Name: Greg Hilmas, Professor of Ceramic Engineer

Department:

Name: Bill Farenholtz, Associate Professor

Department:

Country/Region

USA