NH_4HB_4O_7·3H_2O为硼源添加剂高温高压合成金刚石研究  

Research on Synthesizing Diamond with NH_4HB_4O_7·3H_2O as Addictive under HPHT

作　　者：卢喜瑞[1] 唐敬友[2] 刘党库[3] 姚怀[4] 

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]西南科技大学国防科技学院,绵阳621010 [3]江苏常发集团,常州213176 [4]河南科技大学材料科学与工程学院,洛阳471003

出　　处：《人工晶体学报》2008年第4期872-876,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金项目(No.50472102);四川省科技厅重点项目(05JY029-112);西南科技大学引进人才基金(ZK043130)

摘　　要：为了研究金刚石中硼元素含量对合成金刚石的颜色与热稳定性的影响。以石墨粉体和Fe70Ni30合金触媒为原料，NH4HB4O7·3H2O为硼源添加剂，采用静态高温高压技术合成出金刚石。利用体视显微镜观察合成金刚石的颜色；AES检测金刚石中B元素的含量；TG—DSC进行热稳定性分析。结果表明：合成金刚石的初始氧化温度均超过837℃，最高达到917．8℃；1200℃时热失重率在59％-96％之间，放热峰值在893—1144℃之间；随着硼元素含量的增加，合成金刚石的颜色由淡黄色逐渐向黑色转变，热稳定性提高。In order to investigate the influence of boron content on the color and thermal stability of diamond, synthesis experiments were conducted under high pressure and high temperature, using graphite, Fe70Ni30-alloyed catalyst powders as starting materials, and NH4HB4O7 · 3H2O as addictives The colors of synthetic diamond crystals were observed with the help of a stereomicroscope. The boron contents in the diamond crystals were quantitatively measured by the atomic-emitting spectrum （AES） method. Furthermore, thermal stability of synthetic diamond was analyzed by thermogravimetric analysis （TG） and differential scanning calorimetry （DSC） method. The results indicate that the synthesized diamond had the initial oxygenation temperatures of over 837℃, even up to 917.8 ℃, and the weight loss from 59% to 96% at 1200℃, but the exothermic summit of approximate 893℃, even up to 1144℃. With the increase of the boron content, the color of the diamond turned from yellow to dark, but the thermal stability of diamond got better.

关 键 词：NH4HB4O7·3H2O 添加剂 高温高压 合成 金刚石 

分 类 号：O78[理学—晶体学]