Hole Traps Produced by High-Temperature Heat Treatments of Silicon Above 1300 °C

1990 ◽  
Vol 120 (1) ◽  
pp. K11-K14 ◽  
Author(s):  
Y. Kamiura ◽  
M. Yoneta ◽  
F. Hashimoto
Keyword(s):  
High Temperature ◽  
Heat Treatments ◽  
Temperature Heat

Mo-W Interdiffusion and the Influence on Potassium Bubbles in W Lamp Wire

1996 ◽  
Vol 458 ◽  
Author(s):  
B. P. Bewlay ◽  
C. L. Briant ◽  
M. L. Murray
Keyword(s):  
High Temperature ◽  
Tungsten Wire ◽  
Heat Treatments ◽  
Diffusion Couples ◽  
Microstructural Changes ◽  
Heat Treated ◽  
Temperature Heat ◽  
Microprobe Data ◽  
Equiaxed Grains

ABSTRACTThe effects of Mo contamination on the microstructure of lamp-grade tungsten wire are investigated in this study. Mo is often used as the mandrel material in the coiling of lamp filaments, and when utilized during high temperature heat treatments significant amounts of Mo can diffuse into the W. In this study, W-Mo diffusion couples were prepared and heat treated at temperatures of 2500°C and above to intentionally contaminate the W with Mo. After dissolution of the Mo and additional high temperature heat treatments of the W, equiaxed grains were observed in the W and excessive porosity was also observed. Explanations for these microstructural changes are discussed. Microprobe data were also obtained to quantify interdiffusion between the W and Mo.

EFFECTS OF HEAT TREATMENTS ON THE ON-LINE SERVICE LIFE OF A PRESS DIE MANUFACTURED BY W-EDM

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5631-5636
Author(s):  
KYE-KWANG CHOI ◽  
YONG-SHIN LEE
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Service Life ◽  
Heat Treatments ◽  
Electric Discharge Machining ◽  
Manufacturing Method ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
On Line ◽  
Temperature Heat Treatment

Effects of heat treatments on the on-line service life of a press die manufactured by W-EDM are studied. In this work, four manufacturing processes for a press die are considered: (1) milling and then grinding, (2) wire-cut electric discharge machining (W-EDM), (3) low temperature heat treatment after W-EDM, and (4) high temperature heat treatment after W-EDM. On-line punching experiments for an automobile part of BL646-chain are performed. The amount of wear of the die and punch, roll-over and burnish depth in the punched chain are measured every 1,000 strokes. Overall productivities are carefully compared. Finally, it is concluded that heat treatment after W-EDM for a press die can enhance its on-line service life. Especially, high temperature heat treatment after W-EDM is very attractive as a fast and cheap manufacturing method for a press die.

scholarly journals An Experimental Study on the Slippage Effects of Sandstone under Confining Pressure and Low Pore Pressure Conditions

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Zhengdai Li ◽  
Jianping Zuo ◽  
Yue Shi ◽  
Fei Xu ◽  
Meilu Yu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Pore Pressure ◽  
Wave Velocity ◽  
Heat Treatment Temperature ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Slippage Effect ◽  
Temperature Heat ◽  
The Impact

Due to the influences of various factors, such as temperature, stress, and composition, the research regarding rock permeability has been complicated. This study examined the variation laws of sandstone specimens under changing rates of confining and pore pressures after high-temperature heat treatments. The results showed that the free water in the rock volatilized during the low-temperature heat treatments in the range of 100°C to 300°C, with the increase of the heat-treatment temperature above 500°C; the crystal water in the rock is gradually separated out; and the particles in the samples had undergone phase transformations resulting in increased permeability. According to ultrasonic wave velocity test results, the internal cracks of the samples expanded with the increases in the heat-treatment temperatures. In addition, the high-temperature heat treatments were found to improve the accuracy of the direction of the Earth’s stress when using circumferential wave velocity anisotropy methods. Under the influence of slippage effects, as the pore pressure increased, the measured permeability of the samples decreased and the slippage effect occurs in the rock samples with the permeability of 10-3 μm2~10-6 μm2. The experimental results showed that the contribution rate of the slippage effect decreases with the increase of the heat-treatment temperature of the specimen, and the contribution rates of the sandstone slippage effect were generally higher than 5%. Therefore, the impact effects on the permeability of sandstone slippage should be considered in practical engineering processes.

Interface Reaction of SiO2and GaAs during High-Temperature Heat-Treatments

1980 ◽  
Vol 19 (6) ◽  
pp. 1107-1110 ◽  
Author(s):  
Shuzo Mizutani ◽  
Mutsuhiro Mori ◽  
Tetsuo Ono ◽  
Takeo Miyazawa ◽  
Iwao Ohdomari
Keyword(s):  
High Temperature ◽  
Interface Reaction ◽  
Heat Treatments ◽  
Temperature Heat
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