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Theoretical and Experimental Research on Thermal Shock Resistance of High-Temperature Ceramic

Author: GuoYue
Tutor: MengSongHe
School: Harbin Institute of Technology
Course: Engineering Mechanics
Keywords: Ultra - high temperature ceramic Thermal shock resistance Glass phase Biot number R-curve
CLC: TQ174.13
Type: Master's thesis
Year: 2008
Downloads: 112
Quote: 1
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Abstract


The high-temperature ceramic materials have excellent mechanical and thermophysical properties and high chemical stability , have been the high-temperature ceramic materials are used as the main candidate materials for high-temperature field , ZrB2 - based ceramic materials in recent years as the representative of the ultra - high-temperature ceramic materials is expected to to return the aircraft to the most promising structural materials . However , the high - temperature ceramic materials will be due to the impact of heat generated by the drastic changes in temperature , thermal shock performance is good or bad is an important indicator for assessing whether the material can be applied in the service environment . This paper , through the analysis of the material resistance to thermal shock evaluation theory , compared the suitable for evaluation ZrB2 -based high-temperature ceramic materials thermal shock resistance , thermal shock factor R , the applicability of thermal stress fracture theory is verified by experiments . Study crack propagation and ceramic materials thermal shock affect the relationship between the resistance and the use of the the Viker indentation method and envelope method for the determination of the crack growth resistance R curve , draw the mechanism of the two materials system thermal shock resistance differences . ZrB2-SiC material system against two different third additive - containing , within the range of 200 to 1500 ° C thermal shock test, and measuring the remaining flexural strength . Thermal shock temperature difference of about 400 ℃ , the remaining strength of the two materials system dump . Temperature change curve can be seen from the residual strength with ceramic materials , add graphite ( ZSC) relative to add AlN ceramic material ( ZSA) better thermal shock resistance , its main reasons : 1, ZSC has a relatively high thermal conductivity and relatively low thermal expansion coefficient; 2, graphite introduced to increase the soft phase of the share , to consume the crack propagation caused by the energy , so ZSC having more obvious increased resistance curve and better resistance to thermal shock performance. This paper analyzes the thermal load factors of the thermal shock test on the material properties . Calculated Biot's values ??of the thermal shock test . Material surface roughness , surface oxidation , material composition , and microstructure on the thermal shock resistance of high temperature ceramic materials . The test and analysis results show that , for the large grain size , internal defects is small, the smooth surface of the ZrB2 - based high - temperature ceramic material thermal shock better performance .

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory > Physical properties
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