SYNTHESIS OF CUBIC BORON-NITRIDE USING LI3BN2,SR3B2N4 AND CA3B2N4 AS SOLVENT-CATALYSTS

被引：17

作者：

NAKANO, S ^{[1
]}

IKAWA, H ^{[1
]}

FUKUNAGA, O ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,DEPT INORGAN MAT,MEGURO KU,TOKYO 152,JAPAN

来源：

关键词：

D O I：

10.1016/0925-9635(94)90034-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three kinds of metal boron nitride, namely Li3BN2, Sr3B2N4 and Ca3B2N4, were prepared at normal pressure, and cubic boron nitride (c-BN) was synthesized at high pressure and high temperature using these compounds as solvent-catalysts. The synthetic regions of c-BN in P-T space were U-shaped, having a clear minimum threshold pressure. The threshold pressures were found to lie between 4.6 and 5.0 GPa with no temperature dependence for all examined solvent-catalyst systems. It was found that the temperature limit of c-BN synthesis is lower than that reported previously. The c-BN grains grown in the Ca3B2N4-containing system were about 500 mu m maximum which was several times larger than that of the grain sizes using other solvent-catalysts. The formation mechanism of c-BN was discussed on the basis of the dissolution and precipitation of BN in the solvent-catalyst.

引用

页码：75 / 82

页数：8

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[1] THE QUARTZ-REVERSIBLE-COESITE TRANSFORMATION - A PRECISE DETERMINATION AND THE EFFECTS OF OTHER COMPONENTS [J].