摘要
以WC-10Co纳米复合粉末、YSZ纳米粉末与Al2O3亚微粉末为原料,采用热压烧结制备了性能优良的Al2O3/WC-10Co/ZrO2金属陶瓷.分别在1380,1450和1500℃烧结温度下制备Al2O3/WC-10Co/ZrO2金属陶瓷,通过考察烧结体的断裂韧性、洛氏硬度、密度、磁滞回线和断口形貌,研究了烧结温度对WC-10Co纳米复合粉末、YSZ纳米陶瓷粉末与Al2O3亚微粉末的复合粉末烧结性能的影响.确定合理的Al2O3/WC-10Co/ZrO2金属陶瓷烧结温度为1450℃.结果表明,质量分数为50%的WC-10Co纳米复合粉末、10%的YSZ纳米陶瓷粉末与和40%的亚微Al2O3粉末的复合粉末经过48h的高能球磨后,再经过1450℃热压烧结,可以得到晶粒尺寸小于1μm的整体性能较好的亚微Al2O3/WC-10Co/ZrO2金属陶瓷,其相对密度为97.5%,断裂韧性为7.4468MPa·m1/2,硬度为HRA94.0.
Al2O3/WC-10Co/ZrO2 cermets were prepared by a hot-pressing process by using WC 10Co nanocomposite powder, Y2O3 stabilized nanocrystalline ZrO2 powder and submicron Al2O3 powder. The influences of sintering temperature on the microstructure, grain size and properties were investigated according to the density, fracture toughness, Rockwell A hardness （HRA）, hysteresis loops and scanning electron microscopy （SEM） micrographs of fractured surfaces of the specimens. The results show that the composite powders （WC-10Co （50%）/Al203（40% ）/ZrO2（ 10% ） ） after being high-energy ball-milled for 48 h was hot-pressing sintered at 1450℃ then submicron Al2O3/WC-10Co/ZrO2 cermets with an average grain size of less than 1μm and better properties of 97.5 % in relative density, 7. 446 8 MPa· m^1/2 in fracture toughness, HRA 94.0 is achieved.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2006年第7期659-663,共5页
Journal of University of Science and Technology Beijing
基金
教育部科学技术重点研究项目(No.105123)
武汉理工大学校基金资助课题(No.xjj2005166)
