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Elevated temperature thermal properties of ZrB2-B4C ceramics
Affiliation:1. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, Henan, China;2. Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China;3. Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 5018055, Guangdong, China;4. Department of Chemistry and Chemical Biology, Rutgers University, Piscataway 08854, NJ, United States;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Key Scientific Research Base of Ancient Ceramics (Shanghai Institute of Ceramics, Chinese Academy of Sciences), State Administration for Cultural Heritage, Shanghai 201899, China;3. Key Laboratory of the Comprehensive Analysis Technology for Ancient Ceramics and its Application (Shanghai Institute of Ceramics, Chinese Academy of Sciences), Ministry of Culture and Tourism, Shanghai 201899, China;4. Jiangxi Provincial Institute of Cultural Relics and Archaeology, Nanchang 330008, China;5. Ji′an Academy of Jizhou Porcelain Kiln Firing Technology, Ji′an 343000, China;6. Jingdezhen Ceramic University, Jingdezhen 333403, China;1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100000, China;1. Jiangsu Collaborative Innovation Center For Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 211816, China;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Abstract:The elevated temperature thermal properties of zirconium diboride ceramics containing boron carbide additions of up to 15 vol% were investigated using a combined experimental and modeling approach. The addition of B4C led to a decrease in the ZrB2 grain size from 22 µm for nominally pure ZrB2 to 5.4 µm for ZrB2 containing 15 vol% B4C. The measured room temperature thermal conductivity decreased from 93 W/m·K for nominally pure ZrB2 to 80 W/m·K for ZrB2 containing 15 vol% B4C. The thermal conductivity also decreased as temperature increased. For nominally pure ZrB2, the thermal conductivity was 67 W/m·K at 2000 °C compared to 55 W/m·K for ZrB2 containing 15 vol% B4C. A model was developed to describe the effects of grain size and the second phase additions on thermal conductivity from room temperature to 2000 °C. Differences between model predictions and measured values were less than 2 W/m·K at 25 °C for nominally pure ZrB2 and less than 6 W/m·K when 15 vol% B4C was added.
Keywords:Zirconium diboride  Boron carbide  Thermal conductivity
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