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Preparation and oxidation characteristics of ZrC-ZrB2 composite powders with different proportions

International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 521-528页

作者： Yu Wang Guohua Zhang Kuochih Chou State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

ZrC and ZrB2 are both typical ultra-high temperature ceramics,which can be used in the hyperthermal *** this study,a method for preparing ultrafine ZrC-ZrB2 composite powder was provided,by using the raw materials of nano ZrO2,carbon black,B4C,and metallic *** is worth pointing out that ZrC-ZrB2 composite powder with any proportion of ZrC to ZrB2 could be synthesized by this ***,a mixture of ZrC and C was prepared by carbothermal reduction of *** adjusting the addition amount of B4C,ZrC was boronized by B4C to generate ZrC-ZrB2 composite powder with different *** this method,five composite powders with different molar ratios of ZrC and ZrB2(100ZrC,75ZrC-25ZrB2,50ZrC-50ZrB2,25ZrC-75ZrB2,and 100ZrB2)were *** the temperature of boronization and decarburization process was 1473 K,the particle size of product was only tens of ***,the oxidation charac-teristics of different composite powders were investigated through oxidation *** oxidation resistance of ZrC-ZrB2 composite powder continued to increase as the content of ZrB2 increased.

关键词： borides carbides core-shell structures powders ultra-high temperature ceramic

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Microstructure and Oxidation Behavior of ZrB_(2)-SiC ceramics Fabricated by Tape Casting and Reactive Melt Infiltration

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无机材料学报 2024年第8期39卷 955-964页

作者： TAN Min CHEN Xiaowu YANG Jinshan ZHANG Xiangyu KAN Yanmei ZHOU Haijun XUE Yudong DONG Shaoming State Key Laboratory of high Performance ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

ZrB_(2)-based ceramics typically necessitate high temperature and pressure for sintering,whereas ZrB_(2)-SiC ceramics can be fabricated at 1500℃using the process of reactive melt infiltration with *** comparison to the conventional preparation method,reactive synthesis allows for the more facile production of ultra-high temperature ceramics with fine particle size and homogeneous *** this work,ZrSi_(2),B4C,and C were used as raw materials to prepare ZrB_(2)-SiC via combination of tape casting and reactive melt infiltration herein referred to as ZBC *** sample of ZrB_(2)-SiC was also prepared using ZrB_(2) and SiC as raw materials through an identical process designated as ZS *** analysis of both ceramic groups revealed smaller and more uniformly distributed particles of the ZrB_(2) phase in ZBC ceramics compared to the larger particles in ZS *** sets of ceramics underwent cyclic oxidation testing in the air at 1600℃for a cumulative duration of 5 cycles,each cycle lasting 2 *** of the oxidation behavior showed that both ZBC ceramics and ZS ceramics developed a glassy SiO_(2)-ZrO_(2) oxide layer on their surfaces during the *** layer severed as a barrier against *** ZBC ceramics,ZrO_(2) is finely distributed in SiO_(2),whereas in ZS ceramics,larger ZrO_(2) particles coexist with glassy SiO_(2).The surface oxide layer of ZBC ceramics maintains a dense structure because the well-dispersed ZrO_(2) increases the viscosity of glassy SiO_(2),preventing its crystallization during the ***,some SiO_(2) in the oxide layer of ZS ceramics may crystallize and form a eutectic with ZrO_(2),leading to the formation of ZrSiO_(4).This leads to cracking of the oxide layer due to differences in thermal expansion coefficients,weakening its barrier *** analysis of the oxidation resistance shows that ZBC ceramics exhibit less increase in oxide layer thickness and mass compared to ZS ceramics,su

关键词： ultra-high temperature ceramic ZrB2-SiC oxidation behavior reactive melt infiltration

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