注浆成型工艺制备高耐磨氧化铝陶瓷(英文)  

FABRICATION OF ALUMINA CERAMICS WITH HIGH WEAR RESISTANCE BY SLIP CASTING

作　　者：郝洪顺[1] 徐利华[1] 仉小猛[1] 杨剑英[1] 刘明[1] 尹航[1] 

机构地区：[1]北京科技大学无机非金属材料系,北京100083

出　　处：《硅酸盐学报》2008年第11期1615-1619,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金重点项目(50332010);国家科技支撑计划(2006BAB12B03,2006BAB12B05)资助项目

摘　　要：以氧化铝粉末为原料,采用注浆成型工艺制备高耐磨氧化铝陶瓷。采用正交设计的方法来优化胶态成型工艺参数,聚丙烯酸的加入量(质量分数)为1.0%,球磨时间为10h,pH值为11时浆料可达到最大的沉降高度。利用最佳注浆成型工艺,1200℃烧结1h和1540℃烧结2h制备的氧化铝陶瓷结构致密,晶粒大小均匀,微孔较小,体积密度为3.86g/cm3,硬度为11.02GPa,断裂韧性为3.31MPa·m1/2。氧化铝陶瓷烧结体的摩擦实验结果表明:在水润滑条件下的摩擦系数比在干摩擦时小得多,磨损量则较大。利用扫描电镜对干摩擦和水润滑条件下磨损实验后的氧化铝陶瓷的微观形貌进行了分析,发现在干摩擦条件下,主要是黏着脆性磨损;在水润滑条件下,主要是化学腐蚀磨损。Advanced alumina ceramics with high wear resistance were fabricated by slip casting. An orthogonal design was utilized to optimize the colloidal process parameters. The slurry with the largest sedimentation height was prepared when the addition mass fraction of polyacrylic acid was 1.0%, the milling time was 10 h, and the pH value was 11 in the colloidal process. The alumina ceramic prepared by forming using the slurry and sintering at 1 200℃for i h and 1 540℃ for 2 h had a dense and uniform microstructure with high bulk density of 3.86 g/cm3, a high hardness of 11.02 GPa, and a high fracture toughness of 3.31 MPa-m1/2. The friction and wear test results show that the friction coefficient of alumina ceramics under dry friction was lower than that under water lubrication, while the wear mass loss under dry friction was more than that under water lubrication. The mechanism of high wear resistance of the as-fabricated alumina ceramics was determined by observing the microstructure under scanning electronic microscopy. The wear mechanism of alumina ceramics under dry friction is mainly adhesion brittlement rupture and breaking off, while that under water lubrication is mainly chemical fretting wear.

关 键 词：氧化铝陶瓷 注浆成型 正交设计 磨损机理 

分 类 号：TB321[一般工业技术—材料科学与工程]