Fracture behavior of Al2O3/SiC-platelet composites

1996 ◽  
Vol 11 (10) ◽  
pp. 2528-2535 ◽  
Author(s):  
M. Belmonte ◽  
J. S. Moya ◽  
P. Miranzo ◽  
D. Nguyen ◽  
J. Dubois ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Mechanical Behavior ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Impurity Content ◽  
High Viscosity ◽  
Large Matrix ◽  
Alumina Composites ◽  
Shock Resistance

Mechanical behavior of hot-pressed SiC platelet reinforced alumina composites has been analyzed as a function of SiC platelet content for two different alumina matrix powders. Fracture toughness and flexural strength at temperatures ranging from 25 to 1200 °C, R-curve behavior, and thermal shock resistance have been determined. Small differences in the impurity content of the starting Al2O3 powders strongly determine the microstructure and the mechanical behavior of Al2O3/SiC-platelet composites. Low alkali content alumina led to composites with large matrix grain size which presented spontaneous microcracking. At high temperature, a high viscosity liquid phase is formed that shields cracks enhancing mechanical properties and R-curve behavior. A small amount of impurities reduced Al2O3 matrix grain size and avoided spontaneous microcracking. Enhanced fracture toughness (up to 30%) at room temperature, R-curve behavior, and thermal shock resistance were achieved for these materials.

Effect of AlF3 Content on Microstructure and Properties of Mullite/Al2O3 Composite Ceramics

2018 ◽  
Vol 922 ◽  
pp. 62-67
Author(s):  
Ke Zheng Sang ◽  
Fan Wang ◽  
De Jun Zeng ◽  
Hong Wei Li
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Diameter Ratio ◽  
Pressureless Sintering ◽  
Composite Ceramics ◽  
Microstructure And Properties ◽  
Shock Resistance ◽  
Mullite Whiskers

To reinforce the mullite/Al2O3 composite ceramics through formation of mullite whiskers, the composite ceramics were prepared by pressureless sintering using different AlF3 content. The microstructure, porosity, fracture toughness and thermal shock resistance of the composite ceramics were investigated. The results show that the addition of AlF3 can promote the mullite whisker formations, and the whiskers with the size of 3～10μm in diameter and a length-diameter ratio of 10～15 are obtained by sintering at 1600°C with the AlF3 content of 5wt%. Fracture toughness and thermal shock resistance of the composite ceramics are improved by the formation of mullite whisker. The fracture toughness of 4.79MPa•m1/2 can be obtained, and the 95.18% flexural strength remained after thermal shock.

Optimizing Performance of Magnesia-Spinel Brick Used at Cement Rotary Kiln

2011 ◽  
Vol 250-253 ◽  
pp. 588-594 ◽  
Author(s):  
Dong Wang ◽  
Yong Li ◽  
Yang Li ◽  
Rui Li ◽  
Yue Li
Keyword(s):  
Grain Size ◽  
Thermal Shock ◽  
Rotary Kiln ◽  
Thermal Shock Resistance ◽  
Raw Material ◽  
Crushing Strength ◽  
Magnesia Spinel ◽  
Cold Crushing Strength ◽  
Comprehensive Performance ◽  
Shock Resistance

Using high pure magnesia and magnesia-spinel as the main raw material, keeping the same quantity of spinel, specimens were made with different spinel size distribution (≤0.044mm, 1-0mm, 2-1mm, 3-2mm and 3-1mm). Dextrin and brine are the binder. Specimens were dried at the temperature of 110°C for 24 hours, sintered at the temperature of 1680°C holding 8 hours in a tunnel kiln. The properties and microstructure of the specimens were analyzed. The results are shown that the addition of spinel with grain size of 3-1mm improves sintering of magnesia-spinel brick, with the thermal shock resistance reaching 18 cycles, the cold crushing strength reaching 54 MPa, improving the comprehensive performance of the magnesia-spinel brick.

scholarly journals Grain Size Dependence of Thermal Shock Resistance in KZr2(PO4)3 Ceramic

1994 ◽  
Vol 102 (1188) ◽  
pp. 718-721 ◽  
Author(s):  
Naruhito KATAGIRI ◽  
Yasuhisa HATTORI ◽  
Toshitaka OTA ◽  
Iwao YAMAI
Keyword(s):  
Grain Size ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Size Dependence ◽  
Shock Resistance

Thermal shock resistance and fracture toughness during the graphitization process

Carbon ◽  
1981 ◽  
Vol 19 (2) ◽  
pp. 111-118 ◽  
Author(s):  
S. Sato ◽  
K. Kawamata ◽  
H. Awaji ◽  
M. Osawa ◽  
M. Manaka
Keyword(s):  
Fracture Toughness ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Shock Resistance
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