Fabrication of Single Crystalline SiC Layer on High Temperature Glass

1997 ◽  
Vol 144 (5) ◽  
pp. L111-L113 ◽  
Author(s):  
Q.‐Y. Tong ◽  
T.‐H. Lee ◽  
P. Werner ◽  
U. Gösele ◽  
R. B. Bergmann ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystalline

Carbon-doped single-crystalline SiGe/Si thermistor with high temperature coefficient of resistance and low noise level

2010 ◽  
Vol 97 (22) ◽  
pp. 223507 ◽  
Author(s):  
H. H. Radamson ◽  
M. Kolahdouz ◽  
S. Shayestehaminzadeh ◽  
A. Afshar Farniya ◽  
S. Wissmar
Keyword(s):  
High Temperature ◽  
Temperature Coefficient ◽  
Noise Level ◽  
Low Noise ◽  
Temperature Coefficient Of Resistance ◽  
Single Crystalline ◽  
Carbon Doped

Advancements in Fast Epitaxial High-Temperature Brazing of Single-Crystalline Nickel-Base Superalloys

2009 ◽  
Author(s):  
Britta Laux ◽  
Sebastian Piegert ◽  
Joachim Ro¨sler
Keyword(s):  
High Temperature ◽  
Gas Turbines ◽  
Base Material ◽  
Secondary Phases ◽  
Single Crystalline ◽  
Thermodynamic Simulations ◽  
Nickel Base Superalloys ◽  
Stray Grains ◽  
Nickel Base ◽  
Nickel Manganese

High temperature diffusion brazing is a very important technology for filling cracks in components from single-crystalline nickel-base superalloys as used in aircraft engines and stationary gas turbines: alloys, which are similar to the base material, are enhanced by a fast diffusing melting-point depressant (MPD) like boron or silicon, which causes solidification by diffusing into the base material. Generally, epitaxial solidification of single-crystalline materials can be achieved by use of conventional braze alloys, however, very long hold times are necessary to provide a complete diffusion of the MPD out of the braze gap. If the temperature is lowered before diffusion is completed, brittle secondary phases precipitate, which serve as nucleation sites for stray grains and, therefore, lead to deteriorating mechanical properties. It was demonstrated in earlier works that nickel-manganese-based braze alloys are appropriate systems for the braze repair of particularly wide gaps in the range of more than 200 μm, which allow a significant shortening of the required hold times. This is caused by the complete solubility of manganese in nickel: epitaxial solidification can be controlled by cooling in addition to diffusion. In this work, it will be shown that the nickel-manganese-based systems can be enhanced by chromium and aluminium, which is with regard to high-temperature applications a very important aspect. Furthermore, it will be demonstrated that silicon, which could be identified as appropriate secondary MPD in recent works, can be replaced by titanium, as this element has additionally a γ′ stabilizing effect. Several braze alloys containing nickel, manganese, chromium, aluminium and titanium will be presented. Previously, the influence of the above mentioned elements on the nickel-manganese-based systems will be visualized by thermodynamic simulations. Afterwards, different compositions in combination with a heat treatment, which is typical for nickel-base superalloys, will be discussed: a microstructure, which is very similar to that within the base material can be presented.

scholarly journals Single-crystalline perovskite wafers with a Cr blocking layer for broad and stable light detection in a harsh environment

RSC Advances ◽  
2018 ◽  
Vol 8 (27) ◽  
pp. 14848-14853 ◽  
Author(s):  
Qian Wang ◽  
Dongliang Bai ◽  
Zhiwen Jin ◽  
Shengzhong (Frank) Liu
Keyword(s):  
High Temperature ◽  
Harsh Environment ◽  
Blocking Layer ◽  
Ambient Conditions ◽  
Light Detection ◽  
Single Crystalline

Perovskite single-crystalline wafer based photodetectors are prepared with broad photodetection, and show little degradation at high-temperature or with storage under ambient-conditions.

High temperature creep transitions in single crystalline Ni3Al(Ta, B)

1993 ◽  
Vol 8 (10) ◽  
pp. 2510-2514 ◽  
Author(s):  
J. Wolfenstine ◽  
H.K. Kim ◽  
J.C. Earthman
Keyword(s):  
High Temperature ◽  
Stress Exponent ◽  
Applied Stress ◽  
Antiphase Boundary ◽  
Dislocation Climb ◽  
Single Crystalline ◽  
Dislocation Glide ◽  
Boundary Interaction ◽  
Creep Characteristics ◽  
Good Agreement

The high temperature (T = 1083–1388 K, 0.65–0.84 Tm) creep behavior of single crystalline Ni3Al(Ta, B) was investigated. A change in the creep characteristics as a function of applied stress was observed at the uppermost testing temperatures of 1288 and 1388 K. At low applied stress levels the Norton law stress exponent is equal to 4.3; for higher stresses the stress exponent is equal to 3.2. Different creep curves were observed, depending on the value of the stress exponent. The change in stress exponent and nature of the creep curve correspond to a change in the controlling deformation mechanism from dislocation climb to viscous dislocation glide for Ni3Al(Ta, B). The experimentally observed transition stress values between climb and viscous glide are in good agreement with values predicted from theory, assuming that the major force retarding viscous dislocation glide in Ni3Al(Ta, B) is the antiphase boundary interaction.

High Temperature Deformation of Single Crystalline Cr3Si (A15) Intermetallic Compound

1990 ◽  
Vol 213 ◽  
Author(s):  
C. Steve Chang ◽  
D. P. Pope
Keyword(s):  
High Temperature ◽  
Intermetallic Compound ◽  
Single Crystals ◽  
Intermetallic Compounds ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Slip Systems ◽  
Compression Tests ◽  
Single Crystalline ◽  
Slip Traces

AbstractHigh temperature compression tests were performed on Cr 3Si single crystalline and poly crystalline samples. Slip systems were determined to be of the {001}<010> type based on an analysis of slip traces and Laue spots. Single crystals show significant compressive ductility at temperatures above 0.7Tm. The implication of cube slip on the ductility of A15-type intermetallic compounds is discussed.

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