Accession Number:

ADA265177

Title:

Processing and Properties of Coated HPZ Fiber Reinforced Glass-Ceramic Matrix Composites

Descriptive Note:

Final rept. May 1988-Jan 1993

Corporate Author:

UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT

Report Date:

1993-03-01

Pagination or Media Count:

123.0

Abstract:

The main objective of this program was to utilize fiber coatings to tailor, or engineer, the chemistry and bonding characteristics of the fiber matrix interface in glass-ceramic matrix composites reinforced with Dow Cornings polymer derived Si-N-C-0 HPZ fibers such that relatively weak bonding exists at the interface to allow matrix crack deflection to occur, thus increasing the toughness and damage tolerance of the composite, while at the same time maintaining the high temperature oxidative stability of the matrix coatingfiber interfacial region. In addition, for this particular system which is inherently reactive, the fiber coating must also act as a barrier to interdiffusion and reaction. A secondary objective of this program is to investigate advanced composite processing methods other than the traditional hot-pressing, such as hot isostatic pressing HIP and glass matrix transfer molding into integrally woven fiber preforms. During the performance of this contract, the microstructure and properties of HPZ fibers, CVD BN and SiCBN coatings on HPZ fibers, and barium magnesium aluminosilicate BMAS glass- ceramic composites fabricated with these coated fibers were investigated.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE