Effect of High Temperature Annealing on the Microstructure of SCS-6 SiC Fibers

1991 ◽  
Vol 250 ◽  
Author(s):  
X. J. Ning ◽  
P. Pirouz ◽  
R. T. Bhatt
Keyword(s):  
High Temperature ◽  
Grain Growth ◽  
Creep Resistance ◽  
Fiber Strength ◽  
Outer Part ◽  
Carbon Films ◽  
Argon Atmosphere ◽  
High Temperature Annealing ◽  
Sic Fibers ◽  
Sic Fiber

AbstractThe effect of annealing the SCS-6* SiC fiber for one hour at 2000°C in an argon atmosphere is reported. The SiC grains in the fiber coarsen appreciably and the intergranular carbon films segregate to the grain junctions. It would appear that grain growth in the outer part of the fiber is primarily responsible for the loss in fiber strength and improvement in fiber creep resistance.

Lateral grain growth in poly-Si films by gas flame high temperature annealing

1996 ◽  
Vol 441 ◽  
Author(s):  
W. F. Qu ◽  
A. Kitagawa ◽  
Y. Masaki ◽  
M. Suzuki
Keyword(s):  
High Temperature ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Grain Growth ◽  
Strain Energy ◽  
Driving Forces ◽  
Stress Distributions ◽  
High Temperature Annealing ◽  
Gas Flame ◽  
Si Films

AbstractPoly-Si films with the preferential orientation to a random, a (100) and a (110) texture were annealed using a flat gas flame. Remarkable lateral grain growth of (111) grains was observed for poly-Si films with a random and a (110) texture, while in (100) texture films the growth of (100) grains predominated over other grains. There existed tensile stress in as-prepared films. Grains with different orientation were under a different tensile stresses, and such stress distributions on the orientation of grains were different for different textures. The tensile stress was found to become larger in grown grains after high temperature annealing, while the stress on shrunken grains decreased or turned to compressive stress after annealing. These results indicate that strain energy stored in grains is one of the important driving forces in secondary grain growth.

Carbon concentration dependent grain growth of Cu2ZnSnS4 thin films

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20178-20185 ◽  
Author(s):  
Vincent Tiing Tiong ◽  
Yi Zhang ◽  
John Bell ◽  
Hongxia Wang
Keyword(s):  
Thin Films ◽  
High Temperature ◽  
Grain Growth ◽  
Carbon Concentration ◽  
High Temperature Annealing ◽  
Czts Nanocrystals

Influence of carbon on the grain growth of CZTS nanocrystals during high temperature annealing.

Microstructural Investigation of Strength Degradation in A Developmental Cvd Sic Fiber At 2000° C

1997 ◽  
Vol 3 (S2) ◽  
pp. 743-744
Author(s):  
A. Garg ◽  
D. R. Hull ◽  
R. T. Bhatt
Keyword(s):  
Fiber Strength ◽  
Chemical Vapor ◽  
High Strength ◽  
Pyrolytic Carbon ◽  
Microstructural Investigation ◽  
Sic Fibers ◽  
Sic Fiber ◽  
Heat Treated ◽  
Carbon Coated ◽  
Increasing Demand

SiC fibers fabricated by chemical vapor deposition (CVD) methods are being used as reinforcement for metal and ceramic matrix materials because of their high modulus, high strength and good corrosion resistance. These fibers have a complex composite microstructure consisting of a pyrolytic-carbon coated graphite core and a SiC sheath which is often protected by a single or a double layer of carbon-rich coating. Commercially available SCS-6 SiC fibers with a diameter of ˜ 140 μm have been most widely in use for composite fabrication. However, with an ever increasing demand for thinner and stronger fibers, an experimental SiC fiber with a diameter of ˜ 50 μm and having a C-rich SiC sheath was developed by Textron Specialty Materials. The as-fabricated tensile strength of this fiber was found to be ˜ 6 GPa, which is ˜ 50 % higher than that of the SCS-6 fiber.While the room temperature tensile strengths of these fibers heat treated for 1 h in Ar to temperatures ≤ 1600° C were better than those of the SCS-6 fiber, strength of the 2000° C heated fibers decreased to < 1 GPa.

Improvement of the oxidation resistance of TiC-coated carbon black by high-temperature annealing in N2

RSC Advances ◽  
2016 ◽  
Vol 6 (30) ◽  
pp. 25601-25604
Author(s):  
Jianke Ye ◽  
Ke Bao ◽  
Yan Wen ◽  
Jiangtao Li
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Carbon Black ◽  
Grain Growth ◽  
Oxidation Resistance ◽  
Carbon Oxidation ◽  
High Temperature Annealing ◽  
Coated Carbon

The annealing of TiC-coated carbon black in N2 at 1000–1300 °C resulted in formation of a TiCxNy solid solution and grain growth, which significantly increased the commencement and completion temperatures of carbon oxidation.

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