Mould parts of silicon nitride and method for producing such...

Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Having pulling during growth

Reexamination Certificate

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C423S406000, C423S344000, C117S213000, C117S900000, C419S039000, C419S056000

Reexamination Certificate

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07422631

ABSTRACT:
The present invention relates to silicon nitride mould parts, particularly crucibles for use in connection with directional solidification and pulling of silicon single crystals. The mould parts consist of Si3N4having a total open porosity between 40 and 60% by volume and where more than 50% of the pores in the surface of the mould parts have a size which is larger than the means size of the Si3N4particles. The invention further relates to a method for producing the silicon nitride mould parts.

REFERENCES:
patent: 4515755 (1985-05-01), Matsuo et al.
patent: 5618765 (1997-04-01), Takeuchi et al.
patent: 2003/0176271 (2003-09-01), Kriegesmann
patent: 2004/0211496 (2004-10-01), Khattak et al.
patent: 1160223 (2001-12-01), None
patent: 59-162199 (1984-09-01), None
English Translation of Office Action dated Nov. 6, 2004 in Norwegian Patent Application No. 20023865.
English Translation of Office Action dated Apr. 28, 2003 in Norwegian Patent Application No. 20023865.

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