-
摘要: 压力为5.7~6.0 GPa及1 370~1 500 ℃温度范围内，B4C在Ni70Mn25Co5系统中，高压相变为金刚石。合成的金刚石为深黑色，含硼量大于1wt%。粒度为20 m左右，晶形多为立方体与八面体的各种聚形。反应后的金属触媒中，存在Ni2B等硼化物；非金属残留物中，存在B13C2等高硼碳化物。Abstract: Diamond was synthesized by using B4C as the carbon source in the Ni70Mn25Co5-B4C system under 5.7～6.0 GPa and 1 370～1 500 ℃.This is the first example using pure B4C as the carbon source to synthesize diamonds, which is dark and contains more than 1wt% of boron. The synthesized diamond has a grain-size of about 20 m, is mainly a combination of cubic and octahedral bodies. After reaction, Ni2B compounds are found to exist in the metallic catalyst left, and B13C2 compounds with rich boron in the non-metallic remainders.
-
Key words:
- high temperature and high pressure /
- boron carbide /
- i70Mn25Co5 alloy /
- phase transition /
- diamond
-
Minorn A. Diamond and Related Materials, 1993, 2: 183-189. Wolf E. Oppermann H, Hennig H, et al. East German Patent DD 259147 (1988). Gerlach U, Hennig H, Oppermann H, et al. East German Patent DD 257375 (1988). 熊大和, 卢照田. 地质科学, 1985, 3: 259-266. Hong S M, Wakatsuki M. Journal of Materials Science Letters, 1993, 12: 283-285. 叶俐, 罗湘捷, 丁立业. 第八届全国高压学术讨论会(缩编文集). 高压物理学报, 1995, 9(增): 9-11. -
点击查看大图
计量
- 文章访问数: 7563
- HTML全文浏览量: 436
- PDF下载量: 811
下载:
