ZrO_2界面相对3D-Al_2O_3/Al_2O_3复合材料性能的影响
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摘要
实验主要采用溶胶凝胶法(sol-gel)制备3D-Al_2O_3/Al_2O_3复合材料,并在纤维和基体之间制备ZrO_2界面相,通过三点弯曲实验分析材料的力学性能;通过扫描电镜观察破坏规律。研究表明,所制备的3D-Al_2O_3/Al_2O_3复合材料,其基体的主要成分为α-Al_2O_3,引入ZrO_2界面相的复合材料弯曲强度达到75.2MPa,与无界面相复合材料弯曲强度(62.3 MPa)相比提高了20.7%,无界面相Al_2O_3/Al_2O_3复合材料断口平整,呈现脆性断裂,存在ZrO_2界面相的Al_2O_3/Al_2O_3复合材料断口有大量纤维拔出,表现出类似金属断裂的假塑性断裂特征。
3D-Al_2O_3/Al_2O composite was fabricated by sol-gel method. ZrO_2 interface was introduced in between fiber and matrix. Then the three-point bending test was used to measure the composite's flexural property, and the SEM was employed to observe the fracture microstructure. XRD results prove that the matrix is mainly composed of α-Al_2O. The flexural strength of Al_2O/Al_2O composite with ZrO_2 interface is 75.2 MPa, which is higher than that of Al_2O/Al_2O composite without the interface(62.3MPa). The SEM observation found that the fracture surface of the composite without interface is smooth, which is a result of the typical brittle fracture behavior. By contrast, the composite with ZrO_2 interface shows a result of the typical ductile fracture behavior.
3D-Al_2O_3/Al_2O composite was fabricated by sol-gel method. ZrO_2 interface was introduced in between fiber and matrix. Then the three-point bending test was used to measure the composite's flexural property, and the SEM was employed to observe the fracture microstructure. XRD results prove that the matrix is mainly composed of α-Al_2O. The flexural strength of Al_2O/Al_2O composite with ZrO_2 interface is 75.2 MPa, which is higher than that of Al_2O/Al_2O composite without the interface(62.3MPa). The SEM observation found that the fracture surface of the composite without interface is smooth, which is a result of the typical brittle fracture behavior. By contrast, the composite with ZrO_2 interface shows a result of the typical ductile fracture behavior.
引文
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