用B_2O_3和B与Li_3N反应合成CBN  

Synthesis of cubic boron nitride by the reaction of B_2O_3-Li_3N and B-Li_3N

作　　者：吉晓瑞[1] 苏作鹏[2] 刘俊星[3] 杨大鹏[1] 张铁臣[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012 [2]河南大学物理与电子学院,河南开封475004 [3]嘉兴学院机电工程学院,浙江嘉兴314001

出　　处：《金刚石与磨料磨具工程》2007年第6期6-8,18,共4页Diamond & Abrasives Engineering

基　　金：国家自然科学基金资助项目(60176009)

摘　　要：本文研究了在高温高压下B2O3和B分别与Li3N的反应,并对反应生成物进行了X射线衍射分析与红外光谱表征。结果表明当反应条件达到4.0 GPa-1400℃和4.5 GPa-1450℃时,两体系中有CBN生成,低于此条件时BN只以hBN形式生成。上述反应条件低于传统的hBN-Li3N体系合成CBN时Li3BN2与hBN的共融条件5.5 GPa-1610℃。讨论和分析了两种体系中CBN晶体的生长特点,发现反应物熔点低有利于上述反应的发生。在高温高压下利用独立的含B和含N的单质或化合物间的化学反应制备CBN是应该积极探索的合成途径。In this paper, the chemical reactions between BE Os or B and Lis N were investigated under high pressure and high temperature. The phases of the reaction products were determined by X-ray diffraction （XRD） and Fourier transformation infrared （FTIR） spectroscopy analysis. The results showed that cubic BN was formed when the reaction pressure and temperature were up to 4.0 GPa - 1400 ℃ and 4.5 GPa - 1450 ℃ respectively. If the conditions were lower than that, the BN was formed only in hexagonal phase. The lowest conditions of CBN formation are clearly lower than the eutectic condition of Li3BN2 - hBN in Li3N - hBN system. The growth character of CBN crystal was discussed and analyzed. The results showed that reaction was easy to happen when the reactants have low melting point. The method of CBN synthesis by chemical reaction using compounds which contain boron or nitride is another way to prepare CBN and is worthy of investigation.

关 键 词：高温高压 化学反应 合成 CBN 

分 类 号：TQ164[化学工程—高温制品工业]