CeO_(2),Y2O_(3)和ZrO_(2)掺杂Ti/Al_(2)O_(3)复合材料的制备与力学性能

Fabrication and Mechanical Properties of Ti/Al_(2)O_(3) Composites with CeO_(2),Y_(2)O_(3) and ZrO_(2) Doped

实验采用无压气氛烧结方法,在1450℃的Ar气氛中制备了四组样品,分别为CeO_(2)、Y2O_(3)和Zr O_(2)掺杂的Ti/Al_(2)O_(3)复合材料以及未掺杂的空白Ti/Al_(2)O_(3)复合材料。通过四组样品显微结构的对比以及相对密度的计算,探讨了三种烧结助剂对Ti/Al_(2)O_(3)复合材料致密化的影响。计算结果表明,Ti/Al_(2)O_(3)-CeO_(2)复合材料的孔隙率为19.33%,具备最佳的相对密度。四组样品力学性能的计算结果发现,本实验样品中Ti/Al_(2)O_(3)-CeO_(2)复合材料同样具有最优异的力学性能,弯曲强度和断裂韧性分别达到178.26 MPa±2.14 MPa和2.53 MPa×m^(1/2)±0.11 MPa×m^(1/2),强度和韧性相对于空白的Ti/Al_(2)O_(3)复合材料提高了20%以上。此外,采用了X射线衍射分析了四组烧结样品的物相成分。结果表明,Ti与Al_(2)O_(3)之间发生界面反应,生成产物为Ti Al和Ti3Al,CeO_(2)掺杂组样品烧结过程中发生反应生成Ce-Al-O三元化合物,促进了复合材料的致密化烧结。同时,对复合材料力学性能的提升起到了良好的效果。

Ti/Al_(2)O_(3) composites doped with CeO_(2),Y_(2)O_(3) and ZrO_(2) and without were successfully prepared via pressureless sintering in Ar atmosphere at 1450°C.After a comparison of the microstructure of four samples and calculation of their relative density,this paper analyzes the reinforced effect of various sintering aids on the densification of Ti/Al_(2)O_(3) composites in comparison with blank materials.The results suggested that Ti/Al_(2)O_(3)-CeO_(2) composites possess the optimal relavent density when the porosity reaches 19.33%.Calculation results of the mechanical properties of four samples indicate Ti/Al_(2)O_(3) composites demonstrate best mechanical properties with bending strengthen of 178.26 MPa±2.14 MPa,and fracture toughness of 2.53 MPa·m^(1/2)±0.11 MPa·m^(1/2),respectively,which have both increased 20%than blank Ti/Al_(2)O_(3) compositeswas.In addition,phase composition of four samples are analyzed via X ray diffraction.The findings suggest surface reaction between Ti and Al_(2)O_(3) produces TiAl and Ti_(3)Al.While firing process with CeO_(2) doping produces ternary compound Ce-Al-O,which in turn accelerates the densification firing of the composite and help improve the mechanical properties of the composites.