摘要
采用真空热压烧结制备了Al_2O_3/TiC Al_2O_3/TiC/CaF_2自润滑叠层陶瓷材料,其平均维氏硬度为20.7GPa,断裂韧性为4.5 MPa·m^(1/2),在垂直于叠层方向和平行于叠层方向上的抗弯强度差别不大,分别为323 MPa和353 MPa。在环盘式摩擦磨损试验机上进行摩擦磨损实验,研究了该材料在干摩擦条件下与淬火45#钢配副时的摩擦磨损规律。用扫描电镜(SEM)及能量弥散X射线谱(EDS)观察了材料磨损前后的微观形貌并分析其成分组成及其磨损机理。结果表明:Al_2O_3/TiCAl_2O_3/TiC/CaF_2自润滑叠层陶瓷材料磨擦系数和磨损率均随着转速和载荷的升高而下降;具有自润滑特性;Al_2O_3/TiCAl_2O_3/TiC/CaF_2复合叠层陶瓷材料的磨损机理主要是磨粒磨损和黏着磨损。
Al2O3/TiC-Al2O3/TiC/CaF2 laminated composite ceramic material was prepared by vacuum hot pressing sintering. The Vickers hardness is 20.7 GPa and the fracture toughness is 4.5 MPa·.m^1/^2. The bending strength has little difference in the vertical direction and parallel direction which is respectively for 323 MPa and 353 MPa. Sliding wear tests against chilled 45# steel were performed on the ceramic composites using ring-disc method in dry conditions, worn morphology was observed by the scanning electron microscope （SEM） and the composition was investigated by energy- dispersive X-Ray spectroscopy （EDS）. Results show that the friction coefficient and wear rate decline with the increase of the load and rotating speed. The material has self-lubricated property. The main wear mechanisms of laminated composite are abrasive wear and adhesive wear.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2012年第5期538-544,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金青年科学基金项目51005100
中国博士后科学基金面上项目20110491572
东省科技发展计划2012GGX10324资助~~
关键词
复合材料
叠层陶瓷材料
自润滑
摩擦磨损
composites, laminated ceramic materials, self-lubrication, wear and friction
