4.7 Article

High-pressure synthesis and characterization of thermal-stable boron-doped diamond single crystals

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2008.07.015

关键词

Boron-doped diamond; Thermal stability; Fe-Ni-C-B system; High-pressure high-temperature (HPHT); Mechanical property

资金

  1. National Nature Science Foundation of China [50772060]
  2. Nature Science Foundation of Shandong Province [Y2007F12]
  3. Postdoctoral Innovation Foundation of Shandong Province [200702024]

向作者/读者索取更多资源

A high-pressure and high-temperature synthesis route from a Fe-Ni-C-B catalytic system to boron-doped diamond single crystals with gray color and about 300-500 mu m in diameter is reported in this paper. The Fe-Ni-C-B catalytic system was made by powder metallurgy method Using pure iron, nickel, and graphite powders as main raw materials and hexagonal boron nitride (h-BN) as the boron source. It is showed that from Raman spectra, the first-order Raman scattering peak is shifted to low frequency by 43 cm (1) and the full width at half maximum is increased by 7 cm(-1). The Raman spectra provide some indirect evidences fen the boron atoms being incorporated into diamond lattice. Especially, the covalent B-C bond in diamond with in absorption band at 2842 cm(-1) is directly detected in infrared absorption spectrum. The thermal stability and main mechanical properties of boron-doped diamond are greatly improved comparing with that of undoped diamond on base of the data of thermal etching rate, Static compressive strength and impact toughness, which were obtained at different testing temperatures in an and argon, respectively. In addition, the differential thermal analysis reveals that the oxidation resistance of boron-doped diamond is advanced by 168.3 degrees C. A boron coated atomic model is introduced to illustrate the origin of the excellent thermal stability of boron-doped diamond. (C) 2008 Published by Elsevier Ltd.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据