水热合成氮化硼过程中二次氮源加入温度对物相的影响  

Effect of Introducing Secondary Nitrogen Source Temperature on Phases of BN

作　　者：李凯[1] 廉刚[2] 姜海辉[1] 赵显[1] 王琪珑[2] 崔得良[1] 陶绪堂[1] 

机构地区：[1]山东大学晶体材料国家重点实验室,济南250100 [2]山东大学化学与化工学院,济南250100

出　　处：《人工晶体学报》2007年第6期1215-1219,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.20473048;No.90206042);教育部科学技术研究项目(No.104110;No.305010);科技部重大基础研究前期专项项目(No.2005CCA00900);山东省科技攻关计划项目(No.2005GG3203110)

摘　　要：立方氮化硼是一种具有很高应用价值的超硬材料,但目前合成立方氮化硼需要十分苛刻的条件,严重限制了它的应用范围。为了在温和条件下合成立方氮化硼,我们提出了水热选相原位合成方法,并对主要的影响因素进行了研究。本文中,我们探讨了水热合成立方氮化硼过程中,二次氮源的加入温度对产物中物相种类及其含量的影响。结果表明:随着二次氮源加入温度的升高,样品中立方氮化硼的含量逐渐增加,当该温度达到300℃时,可以得到单相立方氮化硼。比较反常的是,当二次氮源的加入温度为260℃时,立方氮化硼的含量却反常地减少。为了解释这个现象,我们提出了一个物相转变势垒的初步模型,并对有关实验现象进行了初步分析。Cubic boron nitride （cBN） is a superhard material with high applications. However, rather harsh conditions are required to synthesize it, which severely limits its applications. For synthesizing single-phase cBN by using hydrothermal synthesis route, we have developed a new phase-selective method, and the major factors have been investigated . In this paper, we report the effect of the temperature of introducing secondary nitrogen source on the different phases and their contents of BN samples. The experimental results revealed that cBN content of the samples increased with the increase of the temperature of introducing secondary nitrogen source. When the temperature was raised to 300℃, single-phase cBN could be prepared. However, when the temperature reached 260℃, cBN content decreased to its minimum value. the related phenomenon has been In order to explain this result, we have analyzed. proposed a potential model, and

关 键 词：立方氮化硼 水热合成 选相原位方法 二次氮源 

分 类 号：TQ126[化学工程—无机化工]