Research on Binder Techniques for High Temperature Radome Structures
Technical Report,17 Oct 1961,17 Jan 1962
GENERAL ELECTRIC CO SCHENECTADY NY SCHENECTADY
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Substitution of glass microspheres for particulate fibers in the silica fiber-reinforced aluminum phosphate laminates resulted in low viscosity binder. For the most part laminates were weak. Little or no improvement in electrical properties was observed. Two formulations, however, appeared worthy of investigation. Based on the improved flexural strength obtained in previous experiments by substituting asbestos in formulations containing particulate fibers, asbestos was added to glass microsphere formulations. No marked increase in strength was noted. The lower strength may be due to the chrysotile type asbestos reacting with the aluminum phosphate to a lesser extent in the presence of the microspheres. Substitution of silica microspheres for particulate fillers resulted in much lower viscosity, probably due to the fact that the silica does not react in the formulation. The laminates appeared tough, but since the molds were not filled with the lower viscosity binder, more silica must be used to fill molds to obtain valid data for future tests. Improved laminate modulus and strength using palygorskite or palygorskite paper as filler was indicated. Baymal colloidal alumina appeared to be the aluminum hydroxide material suitable for use with palygorskite.
- Ceramics, Refractories and Glass
- Laminates and Composite Materials