CMC with multiple matrix phases separated by diffusion barrier

US7745022B2 · kind B2 · utility

Assignee

• SIEMENS ENERGY, INC. · US

Inventors

• Jay E. Lane · Murrysville, US
• Jay A. Morrison · Oviedo, US
• Steven C. Butner · San Marcos, US
• Andrew Szweda · Village of La Jolla, US

Key dates

• Filing date: Jul 20, 2006
• Grant date: Jun 29, 2010
• Expiry date: Feb 19, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249957
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A ceramic matrix composite (CMC) material (10) with increased interlaminar strength is obtained without a corresponding debit in other mechanical properties. This is achieved by infusing a diffusion barrier layer (20) into an existing porous matrix CMC to coat the exposed first matrix phase (19) and fibers (12), and then densifying the matrix with repeated infiltration cycles of a second matrix phase (22). The diffusion barrier prevents undesirable sintering between the matrix phases and between the second matrix phase and the fibers during subsequent final firing and use of the resulting component (30) in a high temperature environment.