Effect of Seed Sizes on Growth of Large Synthetic Diamond Crystals

材料科学技术（英文）, 2008, 24(2): 153-156.

^1, , ^2, , ^3, , ^4, , ^5,

1.Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

2.State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

3.State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

4.State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

5.Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

基金项目: 国家自然科学基金(50172018)

Effect of Seed Sizes on Growth of Large Synthetic Diamond Crystals

Chuanyi ZANG ^1, , Rui LI ^2, , Hongan MA ^3, , Shangsheng LI ^4, , Xiaopeng JIA ^5,

1.Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

2.State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

3.State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

4.State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

5.Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China

Keywords： Temperature gradient method

For the growth of large synthetic diamond crystals by temperature gradient method (TGM), the grit sizes of seed crystals have great effects on the growth rate and quality of large grown crystals. Because of the limited area of seed surfaces, the maximum diffusion flux of carbon source, which could be absorbed by the seed, is related to the seed size. And with increasing the seed sizes, the growth rates also increase markedly. However, the seed sizes should be lower than a certain value, which determines the crystal quality directly. For example, with NiMnCo alloy as the metal solvent, when the seed size increases from 0.5 to 1.8 ram, the growth rate increases greatly from about 1.1 to 3.2 rag/h; when the size is beyond 2.0 mm, more and more metal inclusions would be incorporated into the grown crystals, and the crystal quality is destroyed heavily. Finite element analysis (FEA) shows that, due to the special assembly of growth cell, the diffusion of carbon source in the metal solvent is very inhomogeneous, which could be substantiated directly by the appearances and shapes of large grown crystals and the remains of carbon source. And this inhomogeneous diffusion of carbon source would be very harmful to the growth of large diamond crystals, especially when large-size seed crystals are used.

参考文献

[1]	H M Strong;R H Wentorf Jr .[J].Naturwissenschaften,1972,59:1.
[2]	R H Wentorf Jr .[J].Journal of Physical Chemistry,1971,75:1833.
[3]	H M Strong;R M Chrenko .[J].Journal of Physical Chemistry,1971,75:1838.
[4]	H Kanda .[J].BRAZILIAN JOURNAL OF PHYSICS,2000,30(03):482.
[5]	J E Shigley;R Abbaschian;C Clarke .[J].Gems and Gemology,2002,38(02):301.
[6]	H Sumiya;N Toda;S Satoh .[J].Diamond and Related Materials,1996,5:1359.
[7]	R. C. Burns;J. O. Hansen;R. A. Spits;M. Sibanda;C. M. Welbourn;D. L. Welch .Growth of high purity large synthetic diamond crystals[J].Diamond and Related Materials,1999(8-9):1433-1437.
[8]	A Yarnell .[J].Chemical and Engineering News,2004,82(05):26.
[9]	H Sumiya;N Toda;S Satoh .[J].New Diamond and Frontier Carbon Technology,2000,10:233.
[10]	H. Sumiya;N. Toda;S. Satoh .Growth rate of high-quality large diamond crystals[J].Journal of Crystal Growth,2002(Pt.2):1281-1285.
[11]	H Kanda;T Ohsawa .[J].Journal of Crystal Growth,1989,94:115.
[12]	R C Burns;V Cvetkovic;C N Dodge .[J].Journal of Crystal Growth,1990,104:257.
[13]	ZANG Chuan-Yi,JIA Xiao-Peng,MA Hong-An,TIAN Yu,XIAO Hong-Yu.Effect of Regrown Graphite on the Growth of Large Gem Diamonds by Temperature Gradient Method[J].中国物理快报（英文版）,2005(09):2415-2417.
[14]	C Y Zang;X P Jia;H A Ma;S S Li Y Tian and H Y Xiao .[J].Chinese Physics Letters,2006,23:214.
[15]	H M Strong;R E Hanneman .[J].Journal of Chemical Physics,1967,46:3668.

上一张下一张

计量

下载量()
访问量()

作者相关

在本站搜索
在百度学术搜索
在万方数据库搜索
在CNKI搜索

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网

Effect of Seed Sizes on Growth of Large Synthetic Diamond Crystals

参考文献