Thermally induced defects in a polycrystalline diamond layer on a tungsten carbide substrate

被引：11

作者：

Masina, B. N. ^{[1
,2
]}

Forbes, A. ^{[1
,3
]}

Ndwandwe, O. M. ^{[2
]}

Hearne, G. ^{[4
]}

Mwakikunga, B. W. ^{[4
,5
,6
]}

Katumba, G. ^{[1
]}

机构：

[1] CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa

[2] Univ Zululand, Dept Phys & Engn, ZA-3886 Kwa Dlangezwa, South Africa

[3] Univ Kwazulu Natal, Sch Phys, ZA-4000 Durban, South Africa

[4] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa

[5] CSIR, Natl Ctr Nanostruct Mat, ZA-0001 Pretoria, South Africa

[6] Univ Malawi, Dept Phys & Biochem Sci, Blantyre 0003, Malawi

来源：

PHYSICA B-CONDENSED MATTER | 2009年 / 404卷 / 22期

基金：

新加坡国家研究基金会;

关键词：

Laser heating; Thermal stresses; Polycrystalline diamond;

D O I：

10.1016/j.physb.2009.09.036

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this study we make use of laser heating of HTHP industrial diamond, to study temperature induced changes to the diamond structure, both chemically and mechanically, in the absence of mechanical forces. This has relevance to the efficacy of diamond as a hard material in such applications as rock drilling and material processing. We report on the induced defects when the diamond is irradiated with high power CO2 and Nd:YAG lasers respectively, and show that the thermal induced stresses in the diamond are sufficient to radically alter its physical properties, resulting in critical fracture. Raman spectroscopy, X-ray diffraction and scanning electron microscopy indicate that the heating does not result in graphitisation of the diamond, but rather diffusion from the non-diamond base results in cobalt and tungsten oxides forming on the diamond surface. This has a deleterious effect on the diamond performance. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：4485 / 4488

页数：4