scholarly journals Effect of sub-minute high temperature heat treatments on the thermal conductivity of carbon-bonded carbon fiber (CBCF) insulation

1995 ◽  
Author(s):  
R.B. Dinwiddie ◽  
G.E. Nelson ◽  
C.E. Weaver
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Carbon Fiber ◽  
Heat Treatments ◽  
Temperature Heat

Effect of β-Si3N4 Powder on Thermal Conductivity of Silicon Nitride Ceramics

2015 ◽  
Vol 655 ◽  
pp. 11-16 ◽  
Author(s):  
Xing Li Liu ◽  
Meng Meng Peng ◽  
Xiao Shan Ning ◽  
Yosuke Takahashi
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
High Temperature ◽  
Silicon Nitride ◽  
High Temperature Heat Treatment ◽  
Plasma Sintering ◽  
Nitride Ceramics ◽  
Temperature Heat ◽  
Spark Plasma ◽  
Temperature Heat Treatment

To investigate the influence of β-Si3N4 powder on thermal conductivity of silicon nitride, coarse, fine β-Si3N4 powder and various β-Si3N4/α-Si3N4 ratios of starting powders were adopted to fabricate ceramics by spark plasma sintering at 1600°Cand subsequent high-temperature heat treatment at 1900°C with the sintering additives of Y2O3 and MgO. It is found that with more fine β-Si3N4 powder in the starting powder, β-Si3N4 grains exhibit high thermal conductivity, which is partly resulted from the compaction of β-Si3N4 grains.

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.

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

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.

Sign in / Sign up

Export Citation Format

Share Document