摘要 |
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 Si<SUB>3</SUB>N<SUB>4 </SUB>having 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 Si<SUB>3</SUB>N<SUB>4 </SUB>particles. The invention further relates to a method for producing the silicon nitride mould parts.
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