摘要
分别采用甲基丙烯酸(MAA),3-(异丁烯酰氧)丙基三甲氧基硅烷(γ-MPS)和硬脂酸(SA)作为改性剂对ZrO2粉体进行表面改性,然后制成光固化浆料,通过红外光谱,结合粒度分析、沉降实验和流变测试等手段,研究改性剂对粉体粒度分布以及浆料的稳定性与粘度的影响和作用机制。结果表明,改性剂以化学吸附的方式存在于ZrO2粉体表面,可有效减少粉体团聚。对ZrO2粉体进行表面改性,可提高光固化浆料的稳定性,并降低浆料粘度。添加0.5%MAA(质量分数)的改性效果最好,在剪切速率为1 s^-1下的浆料粘度由156.2 Pa·s降为47.1 Pa·s。固相含量(质量分数)为75%的ZrO2浆料经过光固化成形和1 500℃烧结3 h后,得到密度为6.02 g/cm^3,硬度(HV(10))为1 290的ZrO2陶瓷。
The surface of ZrO2 powder was modified by MAA,3-(isobutyryloxy)propyltrimethoxysilane(γ-MPS)and stearic acid(SA),and then the stereolithography slurry was prepared.By means of infrared spectrum,particle size analysis,sedimentation experiment and rheological test,the effect and mechanism of modifier on particle size distribution,stability and viscosity of slurry were studied.The results show that the modifier exists on the surface of ZrO2 powder in the form of chemical adsorption,which can effectively reduce the agglomeration of powder.The surface modification of ZrO2 powder can improve the stability and reduce the viscosity of the stereolithography slurry.Adding 0.5%MAA(mass fraction)has the best modification effect.The viscosity of the slurry decreases from 156.2 Pa·s to 47.1 Pa·s at the shear rate of 1 s^?1.ZrO2 green bodies are formed via stereolithography with slurry of 75%solid content and sintered at 1500℃for 3 h.ZrO2 ceramics with density of 6.02 g/cm3 and hardness(HV10)of 1290 are obtained.
作者
李青
刘耀
蔡伟金
石原
刘绍军
LI Qing;LIU Yao;CAI Weijin;SHI Yuan;LIU Shaojun(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Shenzhen Research Institute of Central South University,Shenzhen 518057,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2020年第2期140-147,共8页
Materials Science and Engineering of Powder Metallurgy
基金
深圳市科技创新攻关项目(20170410221235842)。
关键词
光固化成形
氧化锆
表面改性
粘度
固化深度
stereolithography
zirconia
surface modification
viscosity
cure depth
