摘要
以高纯氧化铝（Al2O3）和氧化锆（3Y—ZrO2）粉末为原料，在1450℃下通过真空热压烧结制备3Y-ZrO2／Al2O3细晶复相陶瓷致密块料，随后在1500—1650℃温度范围内进行涡轮盘模拟件的超塑挤压。结果显示，3Y—ZrO2／Al2O3陶瓷在1600℃具有最佳挤压性能，最大单位挤压力小于25MPa，最大压头速率达到0．14mm·min^-1，成形件质量良好，无明显缺陷。与变形前相比，尽管材料晶粒明显粗化，但是致密度有很大提高，断口SEM显示主要以穿晶断裂方式为主，所以成形件的弯曲强度、断裂韧度和维氏硬度并没有出现大的变化，甚至盘片部位还有所提高，分别由变形前的573MPa，7．1MPa·m^1/2。和17．7GPa提高到617MPa，8．1MPa·m^1/2和18．8GPa。
3Y-ZrO2/Al2O3 fine-grained ceramic composite compact was prepared at 1450℃ using vacuum hot-press sintering from high-purity Al2O3 powder and ZrO2 （3Y-TZP） powder. Subsequent superplastic extrusion on turbine disk model was attempted at temperature range of 1500℃to 1650℃. The results demonstrated that the material showed the best formability for extrusion at 1600℃ , at which the maximum extrusion pressure was less than 25MPa and the maximum punch speed was up to 0. 14mm · min^-1. Deformed samples owned good quality and there were no apparent flaws. Comparing with undeformed sample, extruded samples were observed apparent coarsening in grain size, while its density was higher. SEM micrographs of fracture surfaces showed that the main fracture type was transcrystalline fracture. There was no great change between deformed and undeformed material about the mechanical properties such as flexural strength, fracture toughness and Vichers-hardness. Moreover, the disk exhibited higher mechanical properties and flexural strength, fracture toughness and Vichers-hardness increased from 573 MPa, 7.1 MPa · m^1/2 and 17.7 GPa to 617 MPa, 8. 1 MPa · m^1/2 and 18.8 GPa respectively.
出处
《航空材料学报》
EI
CAS
CSCD
2008年第4期36-40,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金项目(50375037)
