Robert L Sadler

US Patent:

7332112, Feb 19, 2008

Filed:

May 24, 2004

Appl. No.:

10/852293

Inventors:

Kunigal N. Shivakumar - Greensboro NC, US
Vishnu Sarma Avva - Greensboro NC, US
Mannur J. Sundaresan - Greensboro NC, US
Felix Abali - Greensboro NC, US
Anthony Cunningham - Greensboro NC, US
Robert L. Sadler - Greensboro NC, US

Assignee:

N.C. A&T State University - Greensboro NC

International Classification:

C01B 31/02
C04B 35/532

US Classification:

264 295, 264 293, 264 296

Abstract:

An apparatus and method for forming a densified carbon-carbon composite. The apparatus includes: a green part molding station for forming a green part; a carbonization station for carbonizing the green part; and an impregnation station for impregnating the carbonized part with a substantially curing by-product free, high carbon yield resin. The impregnation station includes a mold forming a sealed enclosure configured in the shape of the carbonized part for receiving the carbonized part and a vacuum source for evacuating the mold. At least one resin injection port is in the mold and a supply of substantially curing by-product free, high carbon yield resin is connected to the resin injection port for injection into the mold. In the preferred embodiment, the substantially curing by-product free, high carbon yield resin is a cyanate ester having a viscosity of less than about 100 cps at 250 F. and a carbon yield value of greater than about 60 wt. %.

US Patent:

63256088, Dec 4, 2001

Filed:

May 17, 1999

Appl. No.:

9/313232

Inventors:

Kunigal N. Shivakumar - Greensboro NC
Vishnu Sarma Avva - Greensboro NC
Mannur J. Sundaresan - Greensboro NC
Felix Abali - Greensboro NC
Anthony Cunningham - Greensboro NC
Robert L. Sadler - Greensboro NC

Assignee:

North Carolina A&T State University - Greensboro NC

International Classification:

B29C 7036

US Classification:

4251291

Abstract:

An apparatus and method for forming a densified carbon-carbon composite. The apparatus includes: a green part molding station for forming a green part; a carbonization station for carbonizing the green part; and an impregnation station for impregnating the carbonized part with a substantially curing by-product free, high carbon yield resin. The impregnation station includes a mold forming a sealed enclosure configured in the shape of the carbonized part for receiving the carbonized part and a vacuum source for evacuating the mold. At least one resin injection port is in the mold and a supply of substantially curing by-product free, high carbon yield resin is connected to the resin injection port for injection into the mold. In the preferred embodiment, the substantially curing by-product free, high carbon yield resin is a cyanate ester having a viscosity of less than about 100 cps at 250. degree. F. and a carbon yield value of greater than about 60 wt. %.