scholarly journals INFLUENCE OF LOW TEMPERATURE HIGH PRESSURE AND HIGH TEMPERATURE HIGH PRESSURE TREATMENT ON STRUCTURE AND SUPERCONDUCTIVITY OF AMORPHOUS ALLOY La80Al20

1983 ◽  
Vol 32 (3) ◽  
pp. 354
Author(s):  
LIU ZHI-YI ◽  
ZHAO YOU-XIANG ◽  
LIU ZHEN-XING ◽  
CHEN GUI-YU ◽  
WANG CHAO-GUO ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Low Temperature ◽  
Amorphous Alloy ◽  
Pressure Treatment ◽  
High Pressure Treatment ◽  
High Temperature High Pressure

Changes in the defect structure of diamond due to high temperature+ high pressure treatment

1975 ◽  
Vol 344 (1636) ◽  
pp. 111-130 ◽  
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
High Temperature ◽  
Optical Absorption ◽  
Defect Structure ◽  
Pressure Treatment ◽  
High Pressure Treatment ◽  
X Ray ◽  
High Temperature High Pressure ◽  
Absorption Measurements

Type la and type IIa diamonds have been heated to temperatures in the range 2000-2300 °C under a pressure of about 4.8 GPa. The changes in the defect structure of these diamonds as a result of the heat treatm ent have been examined by optical absorption measurements, integrated X-ray spike measurements and by electron microscopy. Type la diamonds changed colour from colourless to yellow after being heated for 1 min in the temperature range 2250-2300 °C and it has been shown that the yellowing was due to scattering. The scattering centres responsible were elliptically shaped cracks in the cube planes with their longest dimension in a <110> direction

scholarly journals Revealing the Defects Introduced in N- or Ge-doped Cz-Si by γIrradiation and High Temperature-High Pressure Treatment

2008 ◽  
Vol 114 (2) ◽  
pp. 439-446 ◽  
Author(s):  
K. Wieteska ◽  
A. Misiuk ◽  
M. Prujszczyk ◽  
W. Wierzchowski ◽  
B. Surma ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Pressure Treatment ◽  
High Pressure Treatment ◽  
High Temperature High Pressure

scholarly journals Numerical Simulation and Design of a High-Temperature, High-Pressure Fluid Transport Pipe

2020 ◽  
Vol 10 (17) ◽  
pp. 5890
Author(s):  
Jiyoung Yoon ◽  
Junkyu Park ◽  
Jinhyoung Park
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
High Pressure ◽  
High Temperature ◽  
Low Temperature ◽  
Fluid Transport ◽  
Projectile Velocity ◽  
Gas Leakage ◽  
And Performance ◽  
High Temperature High Pressure

When designing a hand caliber with a high-temperature, high-pressure internal fluid transport pipe, reliability, safe use, and performance must be considered. Reliability refers to the stress caused by thermo-mechanical load; safe use refers to the low-temperature burns that might occur upon contact, and high-temperature burns caused by gas leakage occurring in the cylinder gap; and performance refers to projectile velocity. In this study, numerical simulation methods for heat transfer, structure analysis, and gas leakage are proposed so that solutions can be designed to account for the above three criteria. Furthermore, a hand-caliber design guide is presented. For heat transfer and structural analysis, mesh size, the transient convective heat transfer coefficient, and boundary conditions are described. Regarding gas leakage, methods reflecting projectile motion and determination of the molecular weight of the propellant are described. As a result, a designed hand caliber will have a high reliability, because the thermo-mechanical stress is lower than the yield stress. There will be little risk of low-temperature burns, but there will be a high temperature-burn risk, owing to gas leakage in the cylinder gap. The larger the cylinder-gap size, the greater the gas leakage and the smaller projectile velocity. The presented numerical simulation method can be applied to evaluate various aspects of other structures that require high-temperature, high-pressure fluid-transport pipes.

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