Characterization models for thermal shock resistance and fracture strength of ultra-high temperature ceramics at high temperatures

2017 ◽  
Vol 90 ◽  
pp. 1-13 ◽  
Author(s):  
Ruzhuan Wang ◽  
Weiguo Li
Keyword(s):  
High Temperature ◽  
Thermal Shock ◽  
High Temperatures ◽  
Fracture Strength ◽  
Thermal Shock Resistance ◽  
Ultra High Temperature Ceramics ◽  
Shock Resistance ◽  
Ultra High Temperature

Temperature and Microstructures Dependent Thermal Shock Resistance Models for Ultra-High-Temperature Ceramics Considering Effect of Residual Stress

2013 ◽  
Vol 29 (4) ◽  
pp. 695-702 ◽  
Author(s):  
R. Z. Wang ◽  
S. G. Ai ◽  
W. G. Li ◽  
J. Zheng ◽  
C. Z. Zhang
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Thermal Shock ◽  
Fracture Strength ◽  
Thermal Shock Resistance ◽  
Temperature Dependent ◽  
Ultra High Temperature Ceramics ◽  
Micro Cracks ◽  
Shock Resistance ◽  
Ultra High Temperature

ABSTRACTBased on the researches on the temperature and microstructures dependent fracture strength and temperature dependent thermal shock resistance, the new thermal shock resistance models for ultra-high-temperature ceramics were proposed. The effect of density on the fracture strength of material was investigated. A damage term was introduced to reveal the effects of uncertain factors on fracture strength. The roles of residual stress and microstructure sizes at different initial thermal shock temperatures in the thermal shock resistance were studied using the models. The study showed that the models can reveal the relationships among the residual stress, microstructure sizes and the temperature dependent thermal shock resistance well. The better thermal shock resistance is found for ultra-high-temperature ceramics having small SiC grains and relatively large micro-cracks around SiC grains. Large enhancement in thermal shock resistance can be achieved through our studies.

EFFECTS OF THERMAL ENVIRONMENTS ON THE THERMAL SHOCK RESISTANCE OF ULTRA-HIGH TEMPERATURE CERAMICS

2008 ◽  
Vol 22 (14) ◽  
pp. 1375-1380 ◽  
Author(s):  
WEIGUO LI ◽  
DAINING FANG
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Thermal Environment ◽  
Transfer Condition ◽  
Ultra High Temperature Ceramics ◽  
Thermal Environments ◽  
Shock Resistance ◽  
Ultra High Temperature

In the present study, the temperature-dependent thermal shock resistance parameter of Ultra-High Temperature Ceramics (UHTCs) was measured based on the current evaluation theories of thermal shock resistance parameters, since the material parameters of UHTCs are very sensitive to the changes of temperature. The influence of some important thermal environment parameters on the thermal shock resistance and critical temperature difference of rupture of UHTCs were studied. By establishing the relation between the temperature and the thermal or mechanical properties of the UHTCs, we found that thermal shock behavior of UHTCs is strongly affected by the surface heat transfer coefficient, heat transfer condition and initial temperature of the thermal shock.

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