We have studied the production method of porous ceramics with densely dispersed closed pores with some 10 micrometer spheres in diameter for an ultra light-weight pottery and an electrical and mechanical application. The closed pores were formed by mixing ceramic hollow micro spheres with the ceramic row material. The material of the hollow ceramic spheres and sintering condition were optimized with relation to the ceramic body. We succeeded to make 45% closed pores with spherical shape into the pottery bodies without any open pore. The flexural strength and the thermal conductivity of there porous ceramics are also discussed.
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