高压物理学报

Effects of Pressure on the Recrystallized Graphite

HE Yi-Xing, HAO Zhao-Yin, WANG De-Rong, CHEN Yu-Fei

1992, 6(3): 161-168 . doi: 10.11858/gywlxb.1992.03.001

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Abstract:
Three sorts of recrystallized graphite grains (petal, sphere-like and piece) is the alloy have been observed with microscope. We found that the amount and morphology of the three sorts of recrystallized graphite grains varied with pressures and concluded that the existence of sphere-like recrystalli...

The Phase Transition of La2CuO4+ Synthesized in High Oxygen Pressure

ZHOU Jian-Shi

1992, 6(3): 169-174 . doi: 10.11858/gywlxb.1992.03.002

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Abstract:
In this paper, La2CuO4+ compound with superconducting phase content over 30%, has been obtained by using high oxygen pressure 2.3 PGa techniques, which is the highest oxygen pressure exerted so far on the La2CuO4. It is noteworthy that the excess oxygen content determined by iodimetric titration (=0...

The Surface Impurities Depth-Profiling on the Diamond

ZHANG Shu-Da, ZHU Yao-Hua

1992, 6(3): 175-179 . doi: 10.11858/gywlxb.1992.03.003

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Abstract:
The surface impurities on the diamond were determined and analyzed by the secondary ion mass spectroscopy (SIMS). In order to obtain the depth-profiling of the surface impurities, the ion erosion method was used. The total erosion time was 6 400 s by Ar+ at 15 keV, and N, Na, Mg and Si were chosen a...

A Study on Adiabatic Shear Banding of TC4-Titanium Alloy under Planar Shock Compression

GONG Zi-Zheng, FU Shi-Qin, JING Fu-Qian

1992, 6(3): 180-191 . doi: 10.11858/gywlxb.1992.03.004

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Abstract:
Investigations for adiabatic shear banding (ASB) of a TC4-titanium alloy under planar shock compression were performed by using a compressed gas gun of 57 mm bore diameter, and symmetric impact technique. The stresses in the target, from 3 to 15 GPa, were designed above the Hugoniot elastic limit, H...

The Effect of Different Additives on the Microstructure and Property of Sintered Diamond with Fine Grain Size

LI Shang-Jie, WANG Li-Wei, TAN Shu-Zhen

1992, 6(3): 192-197 . doi: 10.11858/gywlxb.1992.03.005

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Abstract:
The difference in the microstructures of the sintered bodies of diamonds with Si-Ti-B as additives and with nickel as additives was investigated. Effect of the two different additives in the sintering process at high temperature and ultra-high pressures was discussed. The wear resistance and oxidati...

Characteristics of Solid Argon and 4∶1 Methanol-Ethanol Mixture as Pressure-Transmitting Media under High Pressure and Low Temperature

LIU Zhen-Xian, LI Guo-Hua, HAN He-Xiang, WANG Zhao-Ping

1992, 6(3): 198-205 . doi: 10.11858/gywlxb.1992.03.006

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Abstract:
Characteristics of solid argon and 4∶1 methanol-ethanol mixture were systematically studied by using ruby fluorescence technique under high pressure and low temperature (77 K) in the gasket diamond anvil cells. The pressure distribution was determined by measuring the special shifts of the R1 line o...

A Study of Raman Spectra and the Soft Mode Phase Transition under Hydrostatic Pressure in Ba2-xLaxTi4O11

MENG Jin-Fang, ZOU Guang-Tian, CUI Qi-Liang, ZHAO Yong-Nian, LI Dong-Mei

1992, 6(3): 206-211 . doi: 10.11858/gywlxb.1992.03.007

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Abstract:
The Raman spectra of Ba2-xLaxTi4O11 under hydrostatic pressure have been completed. The behavior of the coupled soft mode is found. Through comparing the result of Ba2Ti4O11 obtained by termodynamics with the experimental data, it is believed that the coupling is one between q0 soft optical phonon w...

Formation of Bulk Metallic Glass Zr60Ni20Al20 by High Pressure Quenching

MAO Zi-Li, CHEN Hong, WANG Wen-Kui

1992, 6(3): 212-216 . doi: 10.11858/gywlxb.1992.03.008

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Abstract:
A bulk Zr60Ni20Al20 amorphous alloy was prepared by using high pressure quenching technique. The crystal growth velocity of the undercooled alloy melts at high pressure was estimated much smaller than at normal pressure, confirming that the high pressure quenching facilitates the formation of metall...

On the Boat Deformation in BN Diffusionless Phase Transition

XU Xiao-Wei, ZOU Guang-Tian

1992, 6(3): 217-220 . doi: 10.11858/gywlxb.1992.03.009

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Abstract:
The model of boat deformation is a diffusionless phase transition model describing rBNwBN transition under high static pressure, the boat deformation is easier than the chair deformation on the diffusionless phase transition of rBN.

A Study of the Emission Spectra from Shock Tube Wall under Detonation

LI Zhao-Ning, DENG Xiang-Dong, HU Dong, WANG Yong-Guo, CHENG Xin-Lu, SUN Zhu-Mei, GOU Qing-Quan

1992, 6(3): 221-225 . doi: 10.11858/gywlxb.1992.03.010

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Abstract:
The KODAK-2485 film is used to study the impurity spectrum appeared in the detonation spectrum of four hydracarbon fuels (heptane, isooctane, M-17 and W-11 emulsification) mixed with oxygen (or nitrogen). The emission spectra consists of the continuous emission spectra from detonation products, spec...

An EPR Investigation of Nitrogen Impurities in Synthesized Diamond

ZHAN Rui-Yun, TANG Gong-Ben, LIU Ya-Yan, LIU Gui-Zhen, XU Jie, SUN Wan-Ming

1992, 6(3): 226-229 . doi: 10.11858/gywlxb.1992.03.011

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Abstract:
EPR technique has been used to study the electronic structure of nitrogen impurities in synthesized diamond with pretreated graphite. The observed hyperfine splitting lines of 14N reveals the presence of for types of substitution nitrogen. A quantitative way has been proosed to estimate the spin con...

A Study of the Intensity High Density Polyethylene at Static High Pressure

YANG Guang-Qun, WANG Hui, WU Rui-Qi

1992, 6(3): 230-234 . doi: 10.11858/gywlxb.1992.03.012

PDF (1148)

Abstract:
High density polyethylene was crystallized at static high pressure from 1 GPa to 2 GPa. The Young's modulus of the sample treated by high-pressure compression was measured with the compression method. The results show that the Young's modulus is increased both with the pressure and the crystallinity...

Experimental Study on the Self-Sharpening Property of PDC

YANG BAO-De, MIAO Qing-Wei

1992, 6(3): 235-239 . doi: 10.11858/gywlxb.1992.03.013

PDF (746)

Abstract:
The rate of penetration of PDC bits relates closely to its self-sharpening property. This relation can be tested through rig test which is performed with standard PDC test bit. At the same time the average rate of penetration (v) and average rate of change in ROP () can describe the self-sharpening ...

1992 Vol. 6, No. 3

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