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EP0442303A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

CVD Diamond workpieces and their fabrication

Assignee: General Electric Co
•
Filing: 1991-01-25
•
Granted: —
•
Expires: 2011-01-25
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Abstract

Abstract The present invention is addressed to a method for making diamond workpieces which comprises the steps of placing in a chamber a pattern heated to an elevated CVD diamond-forming temperature, the pattern being the negative of the workpiece. A hydrocarbon/hydrogen gaseous mixture is provided within the chamber in the next step. The gaseous mixture then is at least partially decomposed in the chamber to form/deposit the CVD diamond layer on a surface of the pattern. In the final step, the CVD diamond layer is removed from the pattern to form the workpiece which possesses the surface characteristics of the surface of the pattern upon which it was formed. Appropriate workpieces that can be made in accordance with the inventive process include convergent, divergent, and flat optical mirrors; nozzles, wire dies, and tubular shaped workpieces; curved, angular, and re-entrant shaped workpieces useful in grinding, cutting, wear, and other applications; and a variety of additional products.

Inventors

  • 👤 Robert Charles Devries
  • 👤 Thomas Richard Anthony
  • 👤 James Fulton Fleischer

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-26 20:30
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/26; C23C16/27; C23C16/01

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 95 words
A method for making a three-dimensional diamond workpiece which comprises: (a) placing in a chamber a pattern heated to an elevated CVD diamond-forming temperature, said pattern being the negative of said workpiece; (b) providing a hydrocarbon/hydrogen gaseous mixture within said chamber; (c) at least partially decomposing said gaseous mixture in said chamber to form a CVD diamond layer on a surface of said pattern; and (d) removing said pattern from said CVD diamond layer to form said diamond workpiece which possesses the surface characteristics of the surface of the pattern upon which it was formed.
Claim 2
Dependent Claim 24 words
The method of claim 1 wherein the molar ratio of hydrocarbon to hydrogen in said gaseous mixture ranges from between about 1:10 and 1:1,000.
Claim 3
Dependent Claim 14 words
The method of claim 2 wherein said gaseous mixture additionally comprises an inert gas.
Claim 4
Dependent Claim 16 words
The method of claim 1 wherein said pressure ranges from between about 0.01 and 1,000 Torr.
Claim 5
Dependent Claim 22 words
The method of claim 1 wherein said annulus is heated to a CVD diamond-forming temperature ranging from between about 500° and 1100°C.
Claim 6
Dependent Claim 14 words
The method of claim 1 wherein said hydrocarbon of said gaseous mixture comprises methane.
Claim 7
Dependent Claim 18 words
The method of claim 1 wherein said pattern is manufactured from metal, an alloy, a ceramic, or carbon.
Claim 8
Dependent Claim 21 words
The method of claim 1 wherein said formed CVD diamond layer ranges in thickness from between about 1 and 2000 micrometers.
Claim 9
Dependent Claim 26 words
The method at claim 1 wherein the surface of said pattern upon which said CVD diamond layer is formed has been finished to optical mirror quality.
Claim 10
Dependent Claim 18 words
The process of claim 1 wherein the surface upon which said CVD diamond layer is formed is cylindrical.
Claim 11
Dependent Claim 16 words
The method of claim 1 wherein said removed CVD diamond layer is attached to a support.
Claim 12
Dependent Claim 16 words
The method of claim 11 wherein said support is a metal, an alloy, or a ceramic.

References Cited (Backward Citations)

EP0400947A1 Cited

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