IP Library › Granted Patent US 41,189
Granted Patent E1
US 41,189 · App. 12/362,529 · Granted Apr 6, 2010

Method of making enhanced CVD diamond

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Quick Facts
Patent No.
US 41,189
App. No.
12/362,529
Granted
Apr 6, 2010
Kind
E1
Abstract

Single crystal CVD diamond is heated to temperatures of 1500° C. to 2900° C. under a pressure that prevents significant graphitization. The result is a CVD diamond with improved optical properties.

Claims (12)

1. A method to improve the optical clarity of CVD diamond where the CVD diamond is single crystal CVD diamond, by raising the CVD diamond to a set temperature of at least 1500° C. and a pressure of at least 4.0 GPA outside of the diamond stable phase.

2. The method of claim 1 wherein the CVD diamond is a single crystal coating upon another material.

3. The method of claim 1 wherein the step of raising the temperature of the single crystal CVD diamond further comprises the step of:

raising the single crystal CVD diamond to a set temperature of about 1800° C. to about 2900° C.

4. The method of claim 1 wherein the step of raising the temperature of the single crystal CVD diamond further comprises the step of:

maintaining the temperature of the single crystal CVD diamond at the set temperature for less than about one minute.

5. The method of claim 1 wherein the step of raising the temperature of the single crystal CVD diamond further comprises the step of:

raising the temperature of the single crystal CVD diamond to at least 1500° C. over a time period of about one minute to five minutes.

6. The method of claim 1 wherein the step of raising the temperature of the single crystal CVD diamond comprises of the step of:

raising the temperature of the single crystal CVD diamond to about 2200° C. at a pressure of about 5.0 GPA.

7. The method of claim 1 further comprising the step of:

after reaching the set temperature, decreasing the temperature of the CVD diamond to ambient temperature while maintaining the pressure on the single crystal CVD diamond.