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Title:
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
Document Type and Number:
WIPO Patent Application WO/2012/090542
Kind Code:
A1
Abstract:
Provided are a polycrystalline silicon ingot casting mold and a method for producing polycrystalline silicon ingot casting molds, with which high-quality silicon ingots can be obtained at high yields by minimizing adhesions with the surfaces of the silicon ingot casting molds, and fragments and damage that occur when solidified silicon ingots are released from the molds. The method for producing a polycrystalline silicon ingot casting mold having a release layer is characterized by being provided with: a slurry-forming step for forming a slurry by mixing a silicon nitride powder with water, said silicon nitride powder being obtained by blending a silicon nitride powder (A) having an average particle diameter along the short axis of 0.6 to 13 μm and an oxygen content of 0.3 to 1.0 wt% with a silicon nitride powder (B) having an average particle diameter along the short axis of 0.1 to 0.3 μm and an oxygen content of 1.3 to 20 wt% at a weight ratio of 5:5 to 9:1; a slurry coating step for coating the surface of the mold with the slurry; and a heating step for heating the mold at 400 to 800°C in an atmosphere containing oxygen, after the slurry coating step.

Inventors:
YAMAO TAKESHI (JP)
FUJII TAKAYUKI (JP)
JIDA SHINSUKE (JP)
Application Number:
PCT/JP2011/067108
Publication Date:
July 05, 2012
Filing Date:
July 27, 2011
Export Citation:
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Assignee:
UBE INDUSTRIES (JP)
YAMAO TAKESHI (JP)
FUJII TAKAYUKI (JP)
JIDA SHINSUKE (JP)
International Classes:
C01B33/02; B22C1/00; B22C3/00; C01B21/068
Domestic Patent References:
WO2008026688A12008-03-06
Foreign References:
JP2001510434A2001-07-31
JP2004291029A2004-10-21
JP2007261832A2007-10-11
JP2005095924A2005-04-14
JP2001198648A2001-07-24
JP2007261832A2007-10-11
JP2907366B21999-06-21
JP2907367B21999-06-21
JP3282456B22002-05-13
Other References:
See also references of EP 2660200A4
Attorney, Agent or Firm:
ITAMI, Masaru et al. (JP)
Itami 勝 (JP)
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Claims: