Ca_3N_2在生成BN反应中的作用

Function of Ca_3N_2 in the Formation of BN

研究了Ｃａ３Ｎ２对高温常压下Ｂ４Ｃ与ＮＨ４ＣＬ生成ｈＢＮ反应的作用．在９５０℃，Ｂ４Ｃ与ＮＨ４Ｃｌ的反应产物中含少量 ｈＢＮ，加入Ｃａ３Ｎ２后ｈＢＮ含量无明显变化；在１２００℃，Ｂ４Ｃ与 ＮＨ４Ｃｌ的反应产物中 ｈＢＮ含量高于 ９５０℃时的含量，加入 Ｃａ３Ｎ２后 ｈＢＮ含量明显增加．分析表明： Ｃａ３Ｎ２在上述生成ｈＢＮ的反应中表现出催化作用．Ｃａ３Ｎ２对生成ｈＢＮ反应的催化作用弱于Ｌｉ３Ｎ，而且Ｃａ３Ｎ２和Ｌｉ３Ｎ都只有在熔融状态下才有催化作用．

The function of Ca3N2 on the reaction between B4C and NH4Cl was investigated.Under normal pressure and high temperature. The results showed that there was small amount of hBN formed in the reaction at 950℃, and little change took place after Ca3N2 was added. The amount of hBN achieved from the reaction at 1200℃ was more than that at 950℃, and much more hBN was gained after adding Ca3N2. It was concluded that Ca3N2 performed catalytic function in the formation of hBN. In addition, the results also indicated that the catalytic function of Ca3N2 was less ho that of Li3N, and they could only act as catalyst at melting state.