Accession Number : ADA140529

Title :   Silicon Carbide Fiber/Mullite Composites from Rapidly Solidified Aluminosilicate Powder.

Descriptive Note : Final technical rept. 21 Jun-21 Dec 83,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Tressler,R E ; Messing,G L

PDF Url : ADA140529

Report Date : 01 Apr 1984

Pagination or Media Count : 20

Abstract : It has been demonstrated that mullite matrix ceramics can be formed by crystallizing an amorphous aluminosilicate powder in the presence of a transient liquid (B2O3) by hot pressing at 1050 deg C. A fiber-reinforced composite was fabricated by laying continuous SiC fibers between tape cast layers of the mullite composition and hot pressing at 1050 deg C and 21 MPa for 1/2 hr. The mechanical strength and toughness of samples tested perpendicular to the fiber direction were 110 MPa and 1.44 MPa.m, respectively. As these results were obtained with a porous, large grain size microstructure, that is not optimized, it is suggested that significant enhancement can be obtained through improvements in microstructure uniformity density, fiber distribution and by full crystallization of the mullite matrix. Thus, although a feasible method for fabricating SiC fiber reinforced mullite matrix ceramics has been demonstrated, realization of their full potential requires further study.

Descriptors :   *Powder metals, *Amorphous materials, *Solidification, *Composite materials, *Crystallization, Quick reaction, Heat treatment, Fabrication, Silicon carbides, Fibers, Liquids, Transients, Fiber reinforced composites, Matrix materials, Aluminum, Silicates, Hot pressing, Strength(Mechanics), Microstructure, Sampling, Toughness, Cracks, Argon, Oxygen, Air, Structural analysis

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Fabrication Metallurgy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE