发明名称 |
PROCESS FOR THE PREPARATION OF POWDER FOR OPTICALLY TRANSPARENT CERAMIC MADE OF GAMMA-ALUMINIUM OXYNITRIDE AND THE POWDER OBTAINED THEREOF |
摘要 |
<p>The process consists in reacting aluminium nitride with alpha -alumina and with an alumina with a high specific surface or a precursor which generates an alumina with a high specific surface. More precisely, the process consists in mixing the aluminium nitride, the alpha -alumina and the alumina with a high specific surface or the precursor of such an alumina, in drying the said mixture, in heating the said mixture at a temperature sufficient to obtain a gamma -aluminium oxynitride powder and then in grinding the powder thus obtained. The agglomerated gamma -aluminium oxynitride powder is characterised in that the porosity of the agglomerate is greater than 75%. The ground gamma -aluminium oxynitride powder is characterised in that 100% of the particles have a size of less than 10 mu m and in that it has a transmittance of at least 8% measured at 2500 cm<-1> on a KBr disc with a thickness of 0.9 mm containing 3.33% of gamma -aluminium oxynitride.</p> |
申请公布号 |
KR970010339(B1) |
申请公布日期 |
1997.06.25 |
申请号 |
KR19940006605 |
申请日期 |
1994.03.30 |
申请人 |
ELF ATOCHEM S.A. |
发明人 |
BALCHELARD, ROLAND;DISSON, JEAN-PIERRE;MORLHON, BRUNO |
分类号 |
C01B21/072;C01B21/082;C01F7/00;C04B35/58;(IPC1-7):C01F7/00 |
主分类号 |
C01B21/072 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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