Ceramic powder and applications thereof
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsYasuhisa Nishi, Mitsuyoshi Iwasa
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Abstract
The present invention provides ceramic powder capable of being incorporated into rubber or a resin for the preparation of a composition, which shows excellent heat resistance and flame retardancy and which is used, for instance, as a semiconductor-sealing material. The ceramic powder has a multi-peak frequency distribution pattern having at least two peaks as a particle size distribution as determined using a laser diffraction-scattering type particle size-analyzer, wherein the maximum particle size for the first peak ranges from 40 to 80 μm and that for the second peak ranges from 3 to 8 μm and wherein the rate of the particles having a particle size of not less than 20 μm and less than 40 μm is not more than 20% by mass (inclusive of 0% by mass).
Claims7
Ceramic powder having a multi-peak frequency distribution pattern having at least two peaks as a particle size distribution as determined using a laser diffraction-scattering type particle size-analyzer, the maximum particle size for the first peak ranging from 40 to 80 μm and that for the second peak ranging from 3 to 8 μm, the rate of the particles having a particle size of not less than 20 μm and less than 40 μm being not more than 20% by mass (inclusive of 0% by mass), the ceramic powder having a chemical absorption amount of ammonia ranging from 0.1 to 1.8 μmole/g the ceramic powder being silica powder having an Al2O3 content ranging from 100 to 8,000 ppm, and
- the ceramic powder being produced by coating the surface of starting silica powder with alumina particles and then treating the coated powder with a flame to thus melt and sphere the coated powder.
Dependencies are inferred from the claim text.