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Fabrication and Properties of Ceramic Composites with a Boron Nitride Matrix
Author(s) -
Kim DongPyo,
Gofer Cameron G.,
Economy James
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08850.x
Subject(s) - materials science , composite material , boron nitride , ceramic , ceramic matrix composite , borazine , fabrication , flexural strength , brittleness , fiber , dielectric , coating , boron , medicine , chemistry , alternative medicine , optoelectronics , organic chemistry , pathology
Boron nitride (BN) matrix composites reinforced by a number of different ceramic fibers have been prepared using a low‐viscosity, borazine oligomer which converts in very high yield to a stable BN matrix when heated to 1200°C. Fibers including Nicalon (SiC), FP (A1 2 O 3 ), Sumica and Nextel 440 (Al 2 O 3 ‐SiO 2 ) were evaluated. The Nicalon/BN and Sumica/BN composites displayed good flexural strengths of 380 and 420 MPa, respectively, and modulus values in both cases of 80 GPa. On the other hand, FP/BN and Nextel/BN composites exhibited very brittle behavior. Nicalon fiber with a carbon coating as a buffer barrier improved the strength by 30%, with a large amount of fiber pullout from the BN matrix. In all cases except for Nicalon, the composites showed low dielectric constant and loss.