高压物理学报

A Method of Solving One-Dimension Rigid-Thermo-Visco-Plastic Flow with Cylindrical Symmetry

LI Xiao-Jie, LI Yong-Chi

1996, 10(2): 81-86 . doi: 10.11858/gywlxb.1996.02.001

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Abstract:
Assuming the material incompressible, the partial differential control equations of one-dimension cylindrical flow can be reduced into the ordinary differential equations. These equations can then be solved by using available method for ordinary differential equations. As an example, the collapse of...

Influence of High Pressure on Crystal Field Parameters for GdOBr:Er

LI Hong-Nian, CHI Yuan-Bin, WANG Li-Zhong, LIU Shen-Xin

1996, 10(2): 87-96 . doi: 10.11858/gywlxb.1996.02.002

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Abstract:
The fluorescence spectra of GdOBr:Eu at room temperature and under high pressure up to 12 GPa were measured and analyzed. 43 lines were observed at ambient pressure in the wavenumber of 13 000～21 500 cm-1. From the fluorescence spectra, the major part of the 7F0～5 and all the 5D0~2 stark levels were...

The Crystallization of BN and the Synthesis of cBN at High Pressure and Temperature

MA Xian-Feng, YAN Xue-Wei

1996, 10(2): 97-101 . doi: 10.11858/gywlxb.1996.02.003

PDF (861)

Abstract:
The crystallization of amorphous, turbostratic and low crystalline degree hexagonal BN was found at high pressure and temperature and the conversion behavior of various BN with different crystallinity to cBN were studied. Results show that the synthesis of cBN is getting difficult as the crystallini...

The Influence of Impurities in Liner Materials on the Behavior of Shaped Charge Jets

WANG Tie-Fu, ZHAO Tong-Hu, RUAN Wen-Jun, WANG Lei

1996, 10(2): 102-106 . doi: 10.11858/gywlxb.1996.02.004

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Abstract:
In this paper, the influence of impurities on the behavior of shaped charge jets was investigated by fire tests of depleted uranium shaped charge liner. The results of these tests indicate that impurity carbon have an important influence on the behavior of depleted uranium shaped charge jet. As the ...

Studies on the Recrystallization of Graphite during the Process of Diamond Growth under Excess Pressure

LUO Xiang-Jie, LUO Bo-Cheng, LUO Jun-Yi, CHEN Shi-Tu, DING Li-Ye

1996, 10(2): 107-113 . doi: 10.11858/gywlxb.1996.02.005

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Abstract:
Characteristics of co-growing of recrystallized graphite have been reported during the epitaxial growth process of diamond seed under excess pressure. Spontaneous diamond nucleation was inhibited by recrystallized graphite grains which abundantly distributed in lower temperature zone of metal solven...

The Mechanism of the Negative Bias-Enhanced Nucleation of Diamond

YANG Guo-Wei

1996, 10(2): 114-121 . doi: 10.11858/gywlxb.1996.02.006

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Abstract:
The mechanism of substrates negative bias-enhanced nucleation of diamond, in the growth of diamond thin films by plasma CVD methods is suggested. A relationship between the effect of bias-enhanced nucleation and deposition condition such as the reaction pressures and carbon fractions are obtained fr...

The Flyer Plate Velocity in Explosive Welding under the Critical Conditions

WANG Zhi-Ping, HE Zhi, FU Ming-Lin, LIU Shu

1996, 10(2): 122-129 . doi: 10.11858/gywlxb.1996.02.007

PDF (661)

Abstract:
By analyzing the parameters, it is found that the critical velocity of flyer plate impacting with the parent plate depends principally on the properties of flyer plate and almost has nothing to do with the explosives and its detonation parameters under critical conditions. The results were tentative...

Study on the Emission Spectra from Fast Reaction of Aluminum Powder

LI Zhao-Ning, GOU Qing-Quan, WANG Yong-Guo, HU Dong

1996, 10(2): 130-136 . doi: 10.11858/gywlxb.1996.02.008

PDF (760)

Abstract:
Optical multichannel analyzer (OMA) was used to investigate the emission spectra from the fast reaction of aluminum powders driven by hydrogen-oxygen detonation in shock tube. The spectra from the reactions of two sizes of aluminum powders throughout of the 240～850 nm wavelength region has been dete...

A Embryonic Form of wBN Crystal in Zone of cBN Growth

ZHANG Tie-Chen, YU San, GUO Wei-Li, LIU Jian-Ting, ZOU Guang-Tian, LI Dong-Mei

1996, 10(2): 137-140 . doi: 10.11858/gywlxb.1996.02.009

PDF (736)

Abstract:
In the present paper, embryonic form of wBN crystal was observed in hBN-catalyst system after treatments under static high pressure(～5.0 GPa) and high temperature (～1500 ℃), the size of the embryonic crystal was about 20～30 nm. It is larger than the critical nuclei and smaller than the critical crys...

A Discussion on Some Problem in Fractal Descriptions of Some Fracture Problems

GAO Feng, XIE He-Ping

1996, 10(2): 141-144 . doi: 10.11858/gywlxb.1996.02.010

PDF (738)

Abstract:
Fractal geometry can provide quantitative methods to describe numerous irregular and complicated phenomena in nature, and has widely been used in many scientific fields. However people find that many similar experiments produce contradictory results, and thus make exploration from views of fractal r...

Application of Aluminum in Correcting the Elastic Wave Velocity Measurement of Materials at High Pressure

XU You-Sheng, XIE Hong-Sen, ZHANG Yue-Ming, XU Ji-An, SONG Mao-Shuang, XU Zu-Ming

1996, 10(2): 145-150 . doi: 10.11858/gywlxb.1996.02.011

PDF (923)

Abstract:
A lot of wave velocity data for minerals and rocks have been obtained since the method of elastic wave velocity measurement has been established in YJ-30MN press fitted with a wedge-type cubic anvil at high pressure and high temperature. Many geological problems have been explained by using this vel...

Effect of Filament Temperature on in Situ Absorption Spectrum and Diamond Film Growth

CUI Jing-Biao, MA Yu-Rong, FANG Rong-Chuan

1996, 10(2): 151-156 . doi: 10.11858/gywlxb.1996.02.012

PDF (689)

Abstract:
In situ infrared absorption spectroscopy has been used to study chemical vapor deposition (CVD) diamond growth process. The effects of filament temperature on in situ infrared absorption and diamond film growth are investigated. We find that the absorption of CH4 radicals is always exist while that ...

A New Method of Manganin Piezoresistance Measurement

WANG Xiang, FU Qiu-Wei

1996, 10(2): 157-160 . doi: 10.11858/gywlxb.1996.02.013

PDF (786)

Abstract:
Different techniques in commonly used piezoelectric manganin gauge measurement with constant current supply are briefly discussed, along with their advantages and disadvantages. A new method with higher fidelity and accuracy by using digital oscilloscope is introduced, which can improve not only the...

1996 Vol. 10, No. 2

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