Donald L Petersen

US Patent:

51185717, Jun 2, 1992

Filed:

Dec 21, 1990

Appl. No.:

7/631996

Inventors:

Donald H. Petersen - Grand Prairie TX

Assignee:

LTV Aerospace and Defense Company - Dallas TX

International Classification:

B32B 320
B23K10102
B23K10104

US Classification:

428586

Abstract:

A metal structural component (10) is formed by placing metal tubes (16) between two metal sheets (12) and plastically deforming the tubes (16) by injecting pressured gas therein. The injected gas expands the tubes by superplastic deformation until diffusion bonding occurs between the metal sheets (12) and expanded tubes (16) to form the desired support structure between the metal sheets (12).

US Patent:

41246659, Nov 7, 1978

Filed:

Mar 8, 1977

Appl. No.:

5/775668

Inventors:

Donald H. Petersen - Dallas TX
Warren C. Schwemer - Arlington TX

Assignee:

Advanced Technology Center, Inc. - Dallas TX

International Classification:

C04B 3556

US Classification:

264 28

Abstract:

The method of preparing very dense tungsten carbide bodies. A substantially stoichiometric mixture is prepared from tungsten particles and a carbon precursor, the precursor being a vinylidene chloride based polymeric material such as SARAN. A green body is pressed from the mixture, and said body is initially heated at a controlled rate to decompose on the order of 20% of the polymeric material, providing HCl gas which reacts with oxide contaminants on the metal particles to provide a clean, reactive metal surface for later reaction with the carbon. An intermediate baking step is provided to controllably evolve the gaseous products that result from continued decomposition of the polymeric material. After subsequent heating to 800. degree. -1300. degree. C, the body may be cooled to room temperature and machined to provide threads, apertures or the like.