The effect of alumina contamination from the ball-milling of fused silica on the high temperature properties of injection moulded silica ceramic components

2011 ◽  
Vol 31 (6) ◽  
pp. 977-981 ◽  
Author(s):  
P.J. Wilson ◽  
S. Blackburn ◽  
R.W. Greenwood ◽  
B. Prajapti ◽  
K. Smalley
Keyword(s):  
High Temperature ◽  
Ball Milling ◽  
Fused Silica ◽  
High Temperature Properties ◽  
Ceramic Components ◽  
Silica Ceramic

Effect of Carbothermal Reduction Nitriding of Si/SiO2 Composite Green on Properties of Fused Silica Ceramics

2020 ◽  
Vol 12 (7) ◽  
pp. 934-938
Author(s):  
Liang Tian ◽  
Qinglin Hou ◽  
Yingxia Wang ◽  
Yihui Hou ◽  
Tao Chen
Keyword(s):  
High Temperature ◽  
Carbothermal Reduction ◽  
Fused Silica ◽  
Solid Content ◽  
Nitrogen Compounds ◽  
Green Body ◽  
Nitriding Reaction ◽  
Different Temperatures ◽  
Silica Ceramic

Si/SiO2 composite green body with solid content of 50% was prepared by low toxic gel system and sintered in nitrogen at high temperature. Nitrogen compounds were synthesized in situ on fused silica ceramic substrate. The influence of different temperatures on nitriding reaction was discussed: different temperatures were used for nitriding at 1350 °C, 1400 °C, 1450 °C, 1500 °C. The effect of different nitriding times on nitriding reaction was discussed: different holding times were used for nitriding +1 h, 1.5 h, 2 h and 2.5 h. The best nitriding process was obtained by analyzing the composition, microstructure and properties of the nitrided samples.

scholarly journals Influence of Al2O3 content on mechanical properties of silica-based ceramic cores prepared by stereolithography

2021 ◽  
Author(s):  
Wen Zheng ◽  
Jia-Min Wu ◽  
Shuang Chen ◽  
Chang-Shun Wang ◽  
Chun-Lei Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Flexural Strength ◽  
Room Temperature ◽  
Linear Shrinkage ◽  
Fused Silica ◽  
Al2o3 Content ◽  
High Temperature Mechanical Properties ◽  
Silica Ceramic ◽  
Excellent Chemical

AbstractSilica ceramic cores have played an important part in the manufacture of hollow blades due to their excellent chemical stability and moderate high-temperature mechanical properties. In this study, silica-based ceramics were prepared with Al2O3 addition by stereolithography, and the influence of Al2O3 content on mechanical properties of the silica-based ceramics was investigated. The Al2O3 in silica-based ceramics can improve the mechanical properties by playing a role as a seed for the crystallization of fused silica into cristobalite. As a result, with the increase of Al2O3 content, the linear shrinkage of the silica-based ceramics first decreased and then increased, while the room-temperature flexural strength and the high-temperature flexural strength first increased and then decreased. As the Al2O3 content increased to 1.0 vol%, the linear shrinkage was reduced to 1.64% because of the blocked viscous flow caused by Al2O3. Meanwhile, the room-temperature flexural strength and the high-temperature flexural strength were improved to 20.38 and 21.43 MPa with 1.0 vol% Al2O3, respectively, due to the increased α-cristobalite and β-cristobalite content. Therefore, using the optimal content of Al2O3 in silica-based ceramics can provide excellent mechanical properties, which are suitable for the application of ceramic cores in the manufacturing of hollow blades.

Inhibiting crystallization of fused silica ceramic at high temperature with addition of α-Si3N4

2020 ◽  
Author(s):  
Jun Liu ◽  
Qinghu Wang ◽  
Yawei Li ◽  
Xiong Liang ◽  
Xueqing Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Fused Silica ◽  
Silica Ceramic

CENTRALLOY G4879 MICRO

Alloy Digest ◽  
2013 ◽  
Vol 62 (5) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
High Temperature Properties ◽  
Uniform Dispersion ◽  
Dislocation Movement

Abstract Centralloy G4879 Micro is a cast nickel alloy with very good high-temperature properties. The alloy has carbides in a uniform dispersion that impede dislocation movement. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on casting, machining, and joining. Filing Code: Ni-708. Producer or source: Schmidt & Clemens Inc..

High-temperature properties of liquid-phase-sintered α-SiC

2000 ◽  
Vol 282 (1-2) ◽  
pp. 109-114 ◽  
Author(s):  
Robert P. Jensen ◽  
William E. Luecke ◽  
Nitin P. Padture ◽  
Sheldon M. Wiederhorn
Keyword(s):  
High Temperature ◽  
Liquid Phase ◽  
High Temperature Properties

Study on Properties of the Blends with Direct Coal Liquefaction Residue and Asphalt

2014 ◽  
Vol 488-489 ◽  
pp. 316-321 ◽  
Author(s):  
Jie Ji ◽  
Yong Shang Zhao ◽  
Shi Fa Xu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Processing Method ◽  
Coal Liquefaction ◽  
Direct Influence ◽  
Processing Methods ◽  
High Temperature Properties ◽  
Additive Content ◽  
Direct Coal Liquefaction ◽  
Coal Liquefaction Residue

This paper studies the properties of the blends composed of DCLR (direct coal liquefaction residue) and asphalt using two different processing methods, compares the regulation that the DCLR additive content and processing method take influence on the high-temperature properties, low-temperature properties and durability of the blends. It is found that the DCLR can improve the high-temperature properties of asphalt but degrade its low-temperature properties. The properties of blends composed of DCLR, asphalt and furfural extract oil are tested and analyzed by adding a certain amount of furfural extract oil into it, which shows that adding DCLR can improve the high-temperature properties of asphalt and reduce its low-temperature properties but can hardly cause any impact on the properties of the blends. In addition, the processing method has a direct influence on the properties of blends.

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