High Temperature Performance, Reliability and Simulation of GaAs Mesfets with CVD Diamond Heat Sinks

1992 ◽  
Vol 260 ◽  
Author(s):  
L. Zhu ◽  
Pin F. Tang ◽  
A. Christou
Keyword(s):  
High Temperature ◽  
Thermal Characteristics ◽  
Temperature Stability ◽  
Cvd Diamond ◽  
Heat Sinks ◽  
Infrared Microscopy ◽  
Element Analysis ◽  
Temperature Performance ◽  
Thermal Measurements ◽  
Microscopy Techniques

ABSTRACTAn investigation of the temperature stability and high temperature characteristics of GaAs FETs on CVD diamond heat sinks was carried out by modeling the high temperature electrical characteristics for GaAs MESFETs and by experimentally measuring the elevated temperature performance. The thermal characteristics were determined experimentally using infrared microscopy techniques. The thermal measurements by infrared microscopy were correlated with results of a finite element analysis calculation of the GaAs FET thermal distribution. Reliability testing at 230°C resulted in an MTF of approximately 2000 hours.

Impact of Rheological Properties of Fiber Asphalt Mortar on Mixture Road Performance

2013 ◽  
Vol 734-737 ◽  
pp. 2287-2291 ◽  
Author(s):  
De Dong Guo
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Properties ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Fiber Content ◽  
High Temperature Stability ◽  
Temperature Performance ◽  
Low Temperature Performance ◽  
Asphalt Mortar

Fiber asphalt concrete has been more and more widely used in highway construction. For analyzing high and low temperature performance of fiber asphalt mixture, rheological properties of fiber asphalt mortar were studied through indoor test. Impact of Rheological properties of the fiber asphalt mortar on high temperature and low temperature properties of asphalt mixture was analyzed. Results showed that the larger fiber content was, the better performance of asphalt mixture's high temperature stability, fiber asphalt mortar rut factor and rutting tests results of asphalt mixture were linear correlation, reflecting the high temperature performance of asphalt mixture; With the increase of fiber content, variation of stiffness modulus, creep rate indicators and mixture low temperature performance was consistent, and rheological properties of fiber asphalt mortar could characterize low temperature performance of asphalt mixture.

Finite Element Analysis of Temperature Characteristicon the Pressure Sensor Based on the Shell of Piezo Gauge

2010 ◽  
Vol 156-157 ◽  
pp. 117-122
Author(s):  
Xin E. Li ◽  
Jing Zu ◽  
Peng Xu
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Thermal Barrier Coating ◽  
Temperature Stability ◽  
Chamber Pressure ◽  
Thermal Barrier ◽  
Element Analysis ◽  
Temperature Characteristics ◽  
Barrier Coating ◽  
Novel Method

When the gun chamber pressure is tested, its instantaneous high temperature up to 3000 , Sensor directly touches the high temperature gas. According to this special use environment, A novel method is proposed in this paper: the thermal barrier coating (TBC) is added to protect the sensor against its thermal deformity. And temperature characteristics of the sensor with TBC are analyzed through finite element. finally, its temperature characteristics were experimentally tested. Results show that the thermal barrier coating plaied heat insulation role, temperature stability of the sensor is good.

TD-NICKEL

Alloy Digest ◽  
1965 ◽  
Vol 14 (7) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Melting Point ◽  
Physical Properties ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Temperature Stability ◽  
Temperature Performance

Abstract TD-NICKEL is a dispersion hardened nickel alloy offering high-temperature stability and useful mechanical properties virtually to the melting point of the base metal. It is easy to fabricate. It is capable of operating for long periods of time at high temperatures without degradation of mechanical properties. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-103. Producer or source: E. I. DuPont de Nemours & Company Inc..

REFRACTALOY 70

Alloy Digest ◽  
1961 ◽  
Vol 10 (8) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Temperature Stability ◽  
Nickel Chromium ◽  
Temperature Performance ◽  
Westinghouse Electric Corporation ◽  
Oxidation Resistant ◽  
Westinghouse Electric

Abstract REFRACTALOY 70 is a super heat and oxidation resistant alloy containing high percentages of nickel, chromium, cobalt and molybdenum. It has an exceedingly low creep rate at elevated temperatures and shows marked high temperature stability. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Co-2. Producer or source: Westinghouse Electric Corporation. Originally published July 1953, revised August 1961.

HARVEY HA8116

Alloy Digest ◽  
1967 ◽  
Vol 16 (2) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Creep Resistance ◽  
Base Alloy ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Temperature Stability ◽  
Temperature Performance ◽  
Aluminum Company ◽  
Alpha Titanium

Abstract HARVEY HA8116 is an alpha titanium-base alloy having outstanding creep resistance and high temperature stability. It is non-heat treatable. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, and machining. Filing Code: Ti-50. Producer or source: Harvey Aluminum Company.

TIMETAL 6-2-4-2

Alloy Digest ◽  
2007 ◽  
Vol 56 (6) ◽  
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Creep Strength ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Temperature Stability ◽  
Temperature Performance

Abstract Timetal 6-2-4-2 has a combination of tensile strength, creep strength, toughness, and high-temperature stability for long-term application at temperatures up to 538 deg C (1000 deg F). This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, and joining. Filing Code: TI-140. Producer or source: Timet.

scholarly journals Multiscale Study on the Effect of Nano-Organic Montmorillonite on the Performance of Rubber Asphalt

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaoge Tian ◽  
Ren Zhang ◽  
Zhen Yang ◽  
Yantian Chu ◽  
Yichao Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Storage Stability ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Scanning Calorimetry ◽  
Microscopic Mechanism ◽  
Organic Montmorillonite ◽  
Temperature Performance ◽  
And Storage

In order to improve the high-temperature performance, antiaging performance, and storage stability of rubber asphalt, nano-organic montmorillonite (NOMMT) was mixed with rubber asphalt. Macroscopic influences of NOMMT on rubber asphalt were measured through penetration, softening point, ductility, rotational viscosity tests, dynamic shear rheology test, and bending beam rheology test at low temperature and were conducted on rubber asphalt with different contents of NOMMT. Then, the microscopic mechanism of NOMMT on the microscopic performance of rubber asphalt was studied through using scanning electron microscopy (SEM), infrared spectroscopy (IR), and differential scanning calorimetry (DSC). The results showed that the rubber particles were smoother, uniform, and dispersed after NOMMT was introduced, and the compatibility between NOMMT and crumbed rubber powder was good. Some stable structures were formed in the composite modified asphalt. The disappearance of alcohol phenol and the increase in related groups such as alkane, benzene, and hydrocarbon indicated that chemical reaction occurred between NOMMT and rubber asphalt, resulting in the changes of the performance of the composite modified system, so that high-temperature stability, antiaging properties, and storage stability were improved but its low-temperature performance was decreased.

Study on High Temperature Performance of Asphalt Mixture Based on Rutting Test

2015 ◽  
Vol 744-746 ◽  
pp. 1316-1319
Author(s):  
Yi Wang ◽  
Wei Li
Keyword(s):  
High Temperature ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Temperature Stability ◽  
Maximum Aggregate Size ◽  
Test Results ◽  
High Temperature Stability ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Nominal Size

In order to deeply reveal the high temperature stability of asphalt mixture, rutting test was implemented to evaluate the high temperature stability of asphalt mixture, and the evaluation index is dynamic stability. The effect of asphalt type, degree of compaction, gradation type and nominal maximum aggregate size on rutting test results was studied respectively. The results showed that: modified asphalt can improve the high temperature stability of asphalt mixture effectively; the anti-rutting performance of asphalt mixture reduces gradually with decrease of the degree of compaction; the anti-rutting performance of SAC-16 is greater than that of AC-16; and the anti-rutting performance of asphalt mixture is improved with increase of the nominal size of aggregate.

Study on High Temperature Stability of Off-Axis Aspherical Collimator

2013 ◽  
Vol 552 ◽  
pp. 292-297
Author(s):  
Lei Liu ◽  
Guo Hua Cao
Keyword(s):  
High Temperature ◽  
Linear Expansion ◽  
Focal Length ◽  
Temperature Stability ◽  
Wavefront Aberration ◽  
Linear Expansion Coefficient ◽  
High Temperature Stability ◽  
Element Analysis ◽  
Test Requirements ◽  
Test Process

The collimator is a kind of necessary optical instrument for camera in the assembly, adjustment, and test process. In order to meet the high precision camera test requirements within the temperature in a range of 20°C±10°C, a set of off-axis aspherical collimator with high accuracy and high temperature stability is designed. Mirrors use silicon carbide materials. Collimator tube is made of Indium steel materials. After finite element analysis, difference value of the linear expansion coefficient kept within a certain range and reasonable reflector support and the collimator can keep accurate stability within a certain temperature range. After test, off-axis collimator with Ф400mm diameter and, 8m focal length at 20°C±10°C, the wavefront aberration is kept in the range from1/5λ（P-V, λ=632.8nm) to 1/30λ(RMS).The precision of the collimator can meet design requirement.

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