STUDIES ON REFRACTORY FIBER RESEARCH.
Summary rept. no. 1, 14 Jul 59-30 Sep 60,
HUGHES AIRCRAFT CO CULVER CITY CALIF
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The greatest portion of the work in the program was devoted to the development of a carbon-arc fiberizing apparatus and glass fiberizing techniques. The carbon -arc provided a high temperature source capable of melting all the refractory materials investigated. The characteristics found to be most significant in fiberizing refractory glasses were the temperature, viscosity, and surface tension of the melted glass. Refractory glasses were screened by evaluating the fiberizing characteristics of their compositions, formulated according to the hypotheses of glass formation. Four oxide compositions which produced high fiber yields were selected for comparison with E-glass fibers produced by the same method. Tensile strength measurements of the fibers revealed no significant statistical difference in the strengths of the four compositions and E-glass. One refractory fiber composition was not visually affected when subjected to a temperature of 1250 C for one-half hour. Sufficient quantities of fibers were produced from the four selected refractory compositions for the fabrication of phenolic resin composite test specimens. Measurements of flexural strength, flexural modulus of elasticity, block compressive strength, and punch shear strength indicated that the refractory fiber-resin composites were slightly better than the E-glass-resin composites and compare favorably with chopped roving glass-phenolic resin composites. Author
- Laminates and Composite Materials