Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel

1991 Vol. 5, No. 4

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Explosive Shock Synthesis of Wurtzite Type Boron Nitride
TAN Hua, HAN Jun-Wan, WANG Xiao-Jiang, SU Lin-Xiang, LIU Li, LIU Jiang, CUI Ling
1991, 5(4): 241-253 . doi: 10.11858/gywlxb.1991.04.001
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Abstract:
Reported in the paper are techniques of wurtzite type boron nitride (wBN) synthesis from graphite type BN (gBN) by means of shock compressions created via explosive detonation. Recovered samples after shock processing are treated with molten alkalis and hydrochloric acid. Despite that the domestic g...
Pressure Induced fcc-hcp Phase Transition of Fe62Ni27Mn11 (wt%) Alloy at Room Temperature
YANG Hai-Bin, ZOU Guang-Tian, LI Ming-Hui
1991, 5(4): 254-262 . doi: 10.11858/gywlxb.1991.04.002
PDF (800)
Abstract:
By using Mao-Bell type diamond anvil cell (DAC) and an in situ high pressure powder X-ray diffraction method, the pressure induced phase transition and the isothermal compression of Fe62Ni27Mn11 (wt%) alloy were investigated at room temperature and high pressure up to 43.2 GPa. The crystal structure...
The Relationship of the Electronic Structure and EOS of LiH with the Ion Radius Ratio
TENG Ya-Gang, LI Shao-Meng, ZHANG Chun-Bin
1991, 5(4): 263-266 . doi: 10.11858/gywlxb.1991.04.003
PDF (860)
Abstract:
The computational results of ion crystal LiH at different WS radius ratios by using LMTO energy band method are presented. The compressibility is from =1.0 to =2.5. The effects on electronic structure, electronic occupation number and zero-temperature equation of state are examined. It is shown that...
A Study on Sintering Behavior of Silicon Nitride Si3N4 Micro-Powder under High Pressures
SHEN Zhong-Yi, SUN Ji-Rong, LIU Shi-Chao, LIU Yong, HUANG Zhen-Kun
1991, 5(4): 267-274 . doi: 10.11858/gywlxb.1991.04.004
PDF (750)
Abstract:
Silicon nitride (Si3N4) is a series of ceramic material with outstanding technological properties and has been widely investigated for various engineering applications. On the other hand, these kinds of ceramics are of covalent bounding and are very difficult to sinter. This investigation was conduc...
Study of Wurtzite-Type Boron Nitride and Its Applications (Ⅰ)Shock Wave Synthesis of Wurtzite-Type Boron Nitride
CHI Yuan-Bin, WANG Li-Zhong, XU Hong-Shan, LI Ming-Hui, CHEN Li-Xue, LI Shu-Qing, CHEN Yu-Fei
1991, 5(4): 275-285 . doi: 10.11858/gywlxb.1991.04.005
PDF (757)
Abstract:
Two kinds of hBN (hexagonal boron nitride) powder were used as raw material for synthesizing superhard BN by shock compression. Our explosive experimental assembly was similar to that of Japan Nippon Oil and Fast Company Ltd. After shock treatment the recovered mixture of BN and iron powders was imm...
A New Method for Polishing Sintered Diamond
XU Ji-An
1991, 5(4): 286-287 . doi: 10.11858/gywlxb.1991.04.006
PDF (910)
Abstract:
A smooth, fine and easy polishing method for sintered diamond with iron metal is reported in this paper.
Relative Electrical Resistance of Tungsten under High Pressure
PU Feng-Nian, BI Xiao-Qun, DING Yu-Zhen, GOU Qing-Quan
1991, 5(4): 288-290 . doi: 10.11858/gywlxb.1991.04.007
PDF (875)
Abstract:
The pressure dependence of relative electrical resistance of tungsten is measured in the DAC by our established method under the pressure from 0.8 GPa to 30.8 GPa. The measurement below 10 GPa is in good agreement with that of Bridgman. In the pressure range from 10 to 30.8 GPa, the relative electri...
The Experimental Research of Heat Resistance of Octahedral Boron-Skinned Diamond
ZHANG Qing-Fu, GOU Qing-Quan, LIU Lü-Hua, ZHANG Hui-Ping
1991, 5(4): 291-295 . doi: 10.11858/gywlxb.1991.04.008
PDF (1005)
Abstract:
This paper presents the experiment results on the boron atom permeated into the surface of natural octahedral diamond to form boron skin with ion implantation method. Analysis was done to find whether its heat resistance is the best. The XPS analysis and TGA analysis were carried out on octahedral B...
Sintering of Diamond-Tungsten Carbide Composite under High Pressure and High Temperature
LI Ying, ZOU Guang-Tian
1991, 5(4): 296-300 . doi: 10.11858/gywlxb.1991.04.009
PDF (694)
Abstract:
With small amount of TiH2 and other elements as the cement, a high quality diamond-tungsten carbide composite has been sintered at high pressure and high temperature with DS-029A type cubic press. In the experiment, dehydrogenation of TiH2 and purification of diamond powder were carried out simultan...
Approximate Calculations of Shock Adiabats for Porous Materials
LI Xiao-Jie
1991, 5(4): 301-306 . doi: 10.11858/gywlxb.1991.04.010
PDF (785)
Abstract:
In this paper, it is assumed that the linear relationship of shock adiabat, D=a+bu is valid for dense materials having different specific internal energies at zero-pressure. On the basis of this assumption and by using the thermal expansion relation at normal pressure, equations for calculating shoc...

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