【摘要】 用分散剂聚丙烯酸铵（NH4PAA）和海因环氧树脂与ZrO₂粉末以及去离子水混合成ZrO₂陶瓷浆料,采用凝胶注模法制备ZrO₂陶瓷坯体,在1 500℃无压烧结后获得ZrO₂陶瓷材料,研究浆料的流变性能,并分析分散剂加入量、固相含量和烧结温度对凝胶注模ZrO₂陶瓷生坯和烧结体组织与性能的影响。结果表明,当分散剂（NH4PAA）和海因环氧树脂的添加量（均为质量分数）分别为0.8%和8%,固相ZrO₂的体积分数为50%时,获得黏度为0.46 Pa/s的适合浇注的ZrO₂陶瓷浆料,所得的陶瓷生坯表面光洁、不起皮、不开裂,强度达61.05 MPa,经过1 500℃烧结后的ZrO₂陶瓷抗弯强度为672.52MPa,相对密度达98.26%,其结构均匀、致密性好,以四方相t-ZrO₂为主。更多还原

【Abstract】 ZrO₂ slurry was prepared by the mixture of dispersant NH4 PAA, hydantoin epoxy resin, ZrO₂ powders and deionized water. The body of ZrO₂ ceramic was prepared by gel-casting, and then was sintered without pressure at 1500 ℃. The rheological properties of ZrO₂ slurry and the effects of dispersant amount, solid contents and sintering temperature on the microstructure and properties of ZrO₂ ceramic were investigated. The results show that, the suitable gel-casting ZrO₂ slurries with the viscosity of 0.46 Pa/s can be obtained when the addition（all are quality score） of the dispersant and hydantoin epoxy resin is 0.8 and 8%, respectively, and the solid phase volume fraction is 50%. The surface of as-prepared ZrO₂ ceramic green bodies are smooth without cracking and exfoliation, and the flexure strength can reach to 61.05 MPa. After sintering at 1 500 ℃, the flexrule strength of ZrO₂ ceramic can reach to 672.52 MPa and the relative density is 98.26%. The zirconia ceramics show good homogeneity and well dense structure, mainly consisting of tetragonal ZrO₂ phase.更多还原