Ablative-resistant dielectric ceramic articles

Compositions: ceramic – Ceramic compositions – Refractory


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C04B 3558




A tough, ablative-resistant, dielectric ceramic material is constructed using powder metallurgy techniques. The composite comprises a boron nitride particulate phase immersed in an Al.sub.2 O.sub.3 matrix. The boron nitride particles are preferably 3-5 microns in size, and create the capability of sustaining thermal strains without generating the thermal stresses that lead to material failure. The composite displays superior mechanical strength characteristics.

patent: 3811900 (1974-05-01), Fassell
patent: 3852078 (1974-12-01), Wakatsuki et al.
patent: 4007049 (1977-02-01), Rossi et al.
patent: 4218253 (1980-08-01), Dworak et al.
Rice; R. W. et al., "Thermal Structure Ceramic Composites", Ceram. Eng. and ci. Proc., 1:7-8, pp. 424-443.
Sanders; W. A. et al., Report No. NASATN D-6890, "Evaluation of Oxidation Resistant Nonmetallic Materials at 1204.degree. C. in a MACH 1 Burner".
Claussen; N., "Fracture Toughness of Al.sub.2 O.sub.3 with an Unstabilized ZrO.sub.2 Dispersed Phase", J. Am. Cer. Soc. 59:1-2, pp. 49-51, (1976).
Claussen; N. et al., "Effect of Induced Microcracking on the Fracture Toughness of Ceramics", Am. Cer. Soc. Bull. 56:6, pp. 559-562, (1977).


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