Ube Industries, Inc.

Takayuki Fujii

Takeshi Yamao

Masataka Fujinaga

Shinsuke Jida

Michio Honda

Koji Shibata

Takuji Ohmaru

A method of producing a silicon nitride powder includes heating an amorphous Si&#x2014;N(&#x2014;H)-based compound in which assuming that the specific surface area is RS (m/g) and the oxygen content ratio is RO (mass %), RS/RO is 500 or more, at a temperature rising rate of 12 to 100&#xb0; C./min in a temperature range from 1,000 to 1,400&#xb0; C. while flowing the compound by a continuous firing furnace.

Silicon nitride powder production method, silicon nitride powder, silicon nitride sintered body and circuit substrate using same

Provided are a polycrystalline silicon ingot casting mold and a method for producing a polycrystalline silicon ingot casting mold, with which high-quality silicon ingots can be obtained at high yields by minimizing sticking with the surfaces of the silicon ingot casting mold, and losses and damages that occur when solidified silicon ingot is released from the mold. The method for producing a polycrystalline silicon ingot casting mold having a release layer, including: forming a slurry by mixing a silicon nitride powder with water, coating the surface of the mold with the slurry, and heating the mold at 400 to 800&#xb0; C. in an atmosphere containing oxygen, after coating the slurry.

Polycrystalline silicon ingot casting mold and method for producing same, and silicon nitride powder for mold release material for polycrystalline silicon ingot casting mold and slurry containing same

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Ube, Japan

Takayuki Fujii