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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。
Using methacrylamide as monomer and polyethylenimine as dispersant, the WC green body was prepared by gelcasting and sintered at 1 500 ℃ for 2 h to obtain WC porous ceramic. The results showed that when the content of PEI was 0.2% (mass fraction) and the pH value was 9.5, the stable WC slurry with solid content up to 45% (volume fraction) could be prepared. The pore size of porous ceramic showed a unimodal distribution. The solid content increased from 25% to 45%, the porosity of WC porous ceramic decreased from 61.8% (volume fraction) to 56.3%, and the flexural strength of WC porous ceramic was between 20 and 40 MPa.