Method for producing composite materials and examples of such composite materials

US6737015B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Guenter Knoll · Stuttgart, DE
• Gert Lindemann · Lichtenstein, DE
• Friederike Lindner · Wolfsberg, AT
• Matthias Wiedmaier · Großenhain, DE

Key dates

• Filing date: Nov 1, 2000
• Grant date: May 18, 2004
• Expiry date: Nov 1, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/645
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for manufacturing composite materials from a parent substance containing silicon nitride and metal silicide, having fixed electrical properties. The molded articles are made, virtually with their final contours, prior to a sintering operation. The parent substance containing Si3N4 and a metal silicide is subjected to a gas pressure sintering in a nitrogenous atmosphere. The metal silicide is of the form Me5Si3, where Me is a metal. As a function of a sintering temperature, a lower limit of partial nitrogen pressures is selected so that Si3N4 is stable at the lower limit and an upper limit of the partial nitrogen pressures is selected so that Me5Si3 is stable at the upper limit. The resulting composite material is a silicon-containing composite material made of Si3N4 and the metal silicide. The metal silicide is selected from the group of Nb5Si3, V5Si3, Ta5Si3 and W5Si3.