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Damage Tolerance of Silicon Carbide‐ and Alumina‐Matrix Surface Composites
Author(s) -
Day P. S.,
Skamser D. J.,
Faber K. T.,
Jennings H. M.,
Johnson D. Lynn
Publication year - 1996
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.1151-2916.1996.tb08558.x
Subject(s) - composite material , materials science , chemical vapor infiltration , ceramic matrix composite , silicon carbide , indentation , mullite , composite number , ceramic , fabrication , chemical vapor deposition , medicine , alternative medicine , optoelectronics , pathology
A method for the fabrication of a ceramic‐matrix composite (CMC) layer on the surface of a monolithic substrate via chemical vapor infiltration (CVI) is described. Preforms consisted of tows of fibers wound onto the surface of monolithic cylindrical tubes. Nicalon fibers were wound onto mullite substrates and infiltrated with β‐SiC from CH 3 SiCl 3 /H 2 gas mixtures in a cylindrical cold‐wall reactor. Similarly, Nextel fibers were wound onto A1 2 O 3 substrates and infiltrated with α‐Al 2 O 3 from AlCl 3 /H 2 /CO 2 /N 2 gas mixtures. Composites with densities as high as 88% of the theoretical value were fabricated in 8 h. The effective fracture strength of the SiC‐ and Al 2 O 3 ‐matrix surface composites, as determined from diametral compression tests of C‐ring specimens, was found to be insensitive to damage caused to the outer diameter by a Vickers indentation. The tolerance of the SiC‐matrix surface composites to surface damage was retained in specimens subjected to oxidation at 1000°C for 6 h.