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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

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Front Mater Sci    2013, Vol. 7 Issue (2) : 184-189    https://doi.org/10.1007/s11706-013-0203-y
RESEARCH ARTICLE
Thermal shock behavior of ZrB2--SiC ceramics with different quenching media
Chang-An WANG1(), Ming-Fu WANG2
1. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Science and Technology on Scramjet Laboratory, Beijing 100074, China
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Abstract

The thermal shock behavior of ZrB2--SiC ceramics was studied with water, air and methyl silicone oil as quenching media, respectively. The temperature of all coolants was room temperature (25°C) and the residual strength of the ceramics after quenching was tested. The strength of the ceramics after water quenching had an obvious drop when the temperature difference, ΔT, was about 275°C, while the residual strength of the specimens quenched by air and silicone oil only varied a little and even increased slightly when the temperature difference was higher than 800°C. The different thermal conductive coefficient of the coolants and surface heat transfer coefficient resulted in the differences in the thermal shock behavior. The formation of oxidation layer was beneficial for improving the residual strength of the ceramics after quenching.
Keywords ultra-high temperature ceramic (UHTC)      zirconium diboride (ZrB2)      silicon carbide (SiC)      thermal shock resistance      mechanical property     
Corresponding Author(s): WANG Chang-An,Email:wangca@mail.tsinghua.edu.cn   
Issue Date: 05 June 2013
 Cite this article:   
Chang-An WANG,Ming-Fu WANG. Thermal shock behavior of ZrB2--SiC ceramics with different quenching media[J]. Front Mater Sci, 2013, 7(2): 184-189.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-013-0203-y
https://academic.hep.com.cn/foms/EN/Y2013/V7/I2/184
Fig.1  Structure used for specimen cooled in air: side view (left) and top view (right).
MaterialThermal conductivity /(W·m-1·K-1)
Water0.6
Methyl silicone oil0.16
Air0.026
Tab.1  Thermal conductivity of the coolants at room temperature []
Fig.2  Residual strength values as a function of the change in temperature difference for specimens quenched into water.
Fig.3  Surface morphology of the specimen after water quenching with a temperature difference of 300°C and 600°C.
Fig.4  Residual strength values as a function of the change in temperature difference for specimens quenched into oil and air.
Model of convective heat transferts /(W·m-2·K-1)
Natural convection: gas2-25
Liquid50-1000
Forced convection: gas25-250
Liquid50-25,000
Phase transition convection: boiling2500-100,000
Condensation2000-100,000
Tab.2  Convective heat transfer coefficient of some typical heat transfer model []
Fig.5  Microstructure and energy dispersive spectroscopy (EDS) pattern of oxidation layer formed on the surface.
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