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 Title: |
US5527747:
Rapid process for the preparation of diamond articles
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lackey, Jr., Walter J.; Marietta, GA
Hanigofsky, John A.; Smyrna, GA
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| Assignee: |
Georgia Tech Research Corporation, Atlanta, GA
other patents from GEORGIA TECH RESEARCH CORP. (221085) (approx. 433)
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| Published / Filed: |
1996-06-18
/ 1995-07-12
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| Application Number: |
US1995000501433
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| IPC Code: |
Advanced:
C04B 41/45;
C04B 41/81;
C23C 16/04;
C23C 16/27;
Core:
C23C 16/26;
more...
IPC-7:
C04B 35/52;
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| ECLA Code: |
C04B41/45P; C04B41/81; C23C16/04D; C23C16/27;
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| U.S. Class: |
Current:
501/090;
423/446;
427/249.2;
427/900;
501/087;
501/095.1;
Original:
501/090;
501/087;
501/095;
423/446;
427/249;
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| Field of Search: |
427/249
423/446
501/087,90,95
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| Priority Number: |
| 1995-07-12 |
US1995000501433 |
| 1994-05-23 |
US1994000247511 |
| 1991-10-04 |
US1991000771735 |
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| Abstract: |
A rapid process for the preparation of diamond articles in which a porous, dense preform of diamond particles created by particle packing methods is subjected to forced flow chemical vapor infiltration of a carbon containing reagent gas resulting in the preparation of thick diamond articles.
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| Attorney, Agent or Firm: |
Deveau, Colton & Marquis ;
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| Primary / Asst. Examiners: |
Lewis, Michael; Hendrickson, Stuart L.
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Related Applications: |
| Application Number |
Filed |
Patent |
Pub. Date |
Title |
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| US1994000247511 | 1994-05-23 |
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| US1991000771735 | 1991-10-04 |
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| Parent Case: |
This is a continuation of application Ser. No. 08/247,511 filed on May 23, 1994, abandoned, which is a continuation of application Ser. No. 07/771,735 filed on Oct. 4, 1991, now abandoned.
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| Family: |
None
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First Claim:
Show all 22 claims |
What is claimed is:
1. A process for the preparation of a formed diamond article, comprising the steps of:
- (a) preparing a porous preform of constituents selected from the group consisting of diamond particles, ceramic fibers, ceramic powders, and mixtures thereof, said preform having at least two surfaces and a thickness, said preform having an initial density of between about than 30% and about 95% of theoretical density and being permeable to a gas including a carrier gas and a carbon vapor compound;
- (b) preparing a reagent gas including a carrier gas and a carbon vapor compound;
- (c) subjecting said preform to chemical vapor infiltration at a pressure of between about 10-2 torr and about 103 torr utilizing said reagent gas as the infiltrating medium wherein said reagent gas is passed into and through said preform by creating a pressure differential through said preform, said reagent gas entering said preform through a first surface of said at least two surfaces, infiltrating said thickness of said preform, and exiting said preform through a second surface of said at least two surfaces, said second surface being heated to a temperature of between about 500° C. and about 1200° C.;
- (d) depositing said carbon vapor compound onto said constituents within said preform resulting in the densification of said preform at a rate of approximately 0.05 mm/hr or greater; and
- (e) recovering a composite diamond article consisting of said constituents bonded together by said deposited carbon vapor compound and having a thickness of at least 1 mm.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 3 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
CHEMABS 125(10)118832A
CHEMABS 125(10)118832A
DERABS C1996-299866
DERABS C1996-299866
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| Other References: |
Int'l Encyc. of Composites, Ceramic Matrix Composites CVI: Chemical Vapor Infiltration (VCH, N.Y., Stuart M. Lee, Editor).
Lackey, W.J., et al., "Sphere-Pac-A Practical Remote Fuel Fabrication Concept", 23 Transactrons of the A.N.S. 276 (1979).
Lackey, W.J., et al., "Assessment of Gel-Sphere-Pac Fuel for Fast Breeder Reactors", ORNL-5468 (Oct. 1978).
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