Fibre-reinforced composite ceramics and method of producing the same

US6261981A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Gerd Dietrich · Burgrieden, DE
• Tilmann Haug · Weißenhorn, DE
• Andreas Kienzle · Thierhaupten, DE
• Christian Schwarz · Vuarrengel, CH
• Heike Stover · Dresden, DE
• Karl Weisskopf · Welzheim, DE
• Rainer Gadow · Aschau am Inn, DE

Key dates

• Filing date: Mar 28, 2000
• Grant date: Jul 17, 2001
• Expiry date: Mar 28, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/616
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention provides a fiber-reinforced composite ceramic containing high-temperature-resistant fibers, in particular fibres based on Si/C/B/N, which are reaction-bonded to a matrix based on Si, which is produced by impregnating fiber bundles of Si/C/B/N fibers with a binder suitable for pyrolysis and solidifying the binder, if desired subsequently conditioning the fiber bundles with an antisilicization layer suitable for pyrolysis, for example phenolic resin or polycarbosilane, subsequently preparing a mixture of fiber bundles, fillers such as SiC and carbon in the form of graphite or carbon black and binders, pressing the mixture to produce a green body and subsequently pyrolysing the latter under reduced pressure or protective gas to produce a porous shaped body which is then infiltrated, preferably under reduced pressure, with a silicon melt. This makes it possible to produce, in an efficient manner suitable for mass production, fiber-reinforced composite ceramics which have significantly improved properties compared with conventional composite ceramics and, in particular, are suitable for use in high-performance brake systems (FIG. 1).