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凝胶注模制备碳化钨多孔陶瓷
作者:霍思嘉 王东 王玉金 陈磊 邓伟志 周玉 
单位:哈尔滨工业大学材料科学与工程学院 特种陶瓷研究所 哈尔滨 150001 
关键词:凝胶注模 碳化钨 多孔陶瓷 
分类号:TQ174.9
出版年,卷(期):页码:2016,44(12):1681-1685
DOI:10.14062/j.issn.0454-5648.2016.12.01
摘要:

以甲基丙烯酰胺为单体、聚乙烯亚胺为分散剂,采用凝胶注模工艺制备WC坯体,经1 500 ℃保温2 h烧结,获得WC多孔陶瓷。结果表明:PEI含量为0.2%(质量分数)、pH值为9.5时,可以制备固相含量最高为45%(体积分数)的稳定WC浆料;多孔陶瓷孔径呈单峰分布;随着浆料固相含量从25%增加到45%,WC多孔陶瓷的孔隙率从61.8%(体积分数)下降到56.3%,WC多孔陶瓷的抗弯强度在20~40 MPa之间。

 
Porous tungsten carbide (WC) ceramics were prepared by a gel-casting method, then it was sintered at 1 500 for 2 h to get porous WC ceramic. The results show that the maximum solid loading in WC slurry dispersed with polyethyleneimine (PEI) is 45% (in volume fraction). The WC slurry with the minimum viscosity can be obtained under the optimal condition (i.e., pH value of 9.5 and the dispersant content of 0.2% (in mass fraction)). According to the results by mercury-injection test, the pore size distribution of the ceramics presents a unimodal model. The porosity of WC porous ceramics decreases from 61.8% (in volume fraction) to 56.3% when the solid loading of WC slurry increases from 25% to 45%. The flexural strength of WC porous ceramics is 20 to 40 MPa. This ceramic can be used for machining and the subsequent pressureless reactive melt infiltration.
 
基金项目:
国家自然科学基金(51172052, 51321061)。
作者简介:
霍思嘉(1993—),男,博士研究生。
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