| ZrB2-SiC陶瓷的注浆成型与无压烧结 |
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| 引用本文： | 王新刚,刘吉轩,阚艳梅,张国军,王佩玲.ZrB2-SiC陶瓷的注浆成型与无压烧结[J].无机材料学报,2009,24(4):831. |
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| 作者姓名： | 王新刚 刘吉轩 阚艳梅 张国军 王佩玲 |
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| 作者单位： | 1. 中国科学院 上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室， 上海 200050； 2. 中国科学院 研究生院， 北京 100049 |
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| 基金项目： | 中国科学院"百人计划"项目，国家自然科学基金 |
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| 摘 要： | 研究了以聚乙烯亚胺 (PEI) 为分散剂，ZrB2粉体在水相中的分散性能. 结果显示ZrB2的等电点在pH为5.7，加入PEI后的等电点移到pH为11.5. 以PEI为分散剂，在pH为8.0处制备了固含量达45vol%的ZrB2-20vol%SiC陶瓷浆料. 采用注浆成型方法制备了相对密度为53%的ZrB2-SiC陶瓷坯体，并对其进行了无压烧结，同时研究了硼粉为烧结助剂对其致密化及性能的影响. 结果表明：硼粉为烧结助剂，实现了ZrB2-SiC陶瓷的完全致密化的同时，也降低了ZrB2-SiC陶瓷的烧结温度，2100℃烧结3h后的陶瓷维氏硬度为(17.5±0.5)GPa，弯曲强度为(406±41)MPa，断裂韧性为(4.6±0.4)MPa·m1/2.
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| 关 键 词： | ZrB2-SiC 注浆成型 无压烧结 |
| 收稿时间： | 2008-10-17 |
| 修稿时间： | 2008-12-19 |
Slip Casting and Pressureless Sintering of ZrB2-SiC Ceramics |
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| WANG Xin-Gang,LIU Ji-Xuan,KAN Yan-Mei,ZHANG Guo-Jun,WANG Pei-Ling.Slip Casting and Pressureless Sintering of ZrB2-SiC Ceramics[J].Journal of Inorganic Materials,2009,24(4):831. |
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| Authors: | WANG Xin-Gang LIU Ji-Xuan KAN Yan-Mei ZHANG Guo-Jun WANG Pei-Ling |
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| Affiliation: | 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The dispersion of ZrB2 particles in water was investigated using polyethyleneimine (PEI) as a dispersant. Results showed that the ZrB2 slurry had a isoelectric point of pH=5.7. The application of PEI changed the isoelectric point of the ZrB2 slurry to pH=11.5. High solids loading (45vol%) ZrB2-20vol% SiC slurries were prepared at pH=8.0 by adding 1.0wt% PEI. The green body prepared by slip casting had a relative density of 53%. The effects of boron as a sintering aid on the pressureless sintering process of the ZrB2-20vol% SiC ceramics were investigated. Nearly fully dense ZrB2- SiC composites were obtained by sintering at 2100℃ for 3 h. The sintered ceramics demonstrated a Vickers hardness of (17.5±0.5)GPa, a flexure strength of (406±41)MPa,and a fracture toughness of (4.6±0.4)MPa·m1/2. |
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| Keywords: | ZrB2-SiC |
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