Method to form dense complex shaped articles

US6315945A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• James M. Macki · Sequim, US
• Eric A. Ness · Beaverton, US
• Robert T. Nilsson · Midland, US
• Ellen M. Dubensky · Midland, US
• Walter J. Rozmus · Traverse City, US
• Clifford A. Kelto · Williamsburg, US
• Edward E. Timm · Coleman, US

Key dates

• Filing date: Jan 20, 1998
• Grant date: Nov 13, 2001
• Expiry date: Jan 20, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2237/76
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A consolidated complex shaped article having a density of at least about 95 percent of theoretical density is prepared by placing a plurality of separate bodies in an arrangement, such that each separate body is in contact with at least one other separate body to form an aggregate body and wherein at least one of the separate bodies is essentially dense. The material of each separate body is comprised of a ceramic, a cermet or a metal. The aggregate body is then consolidated at a consolidating temperature, superatmospheric pressure and time at temperature and time at superatmospheric pressure sufficient to form a consolidated shaped article. In consolidating the aggregate body, the consolidating temperature is a temperature that fails to form a liquid within at least one separate body and the superatmospheric temperature is applied for at least a portion of the time at the consolidating temperature.