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利用钴包覆的纳米Al2O3和TiC粉料采用热压烧结法制备了抗弯强度为782MPa、断裂韧度为7.81MPa·m1/2的复相陶瓷材料,并建立了该种材料的显微结构示意图,从界面的角度分析了力学性能提高的原因。观察材料的断口形貌发现形成了晶内型结构,并观察到了裂纹的扩展路径以及裂纹的分叉、偏转、桥联等现象。
The composite ceramic materials with a bending strength of 782MPa and a fracture toughness of 7.81MPa · m1 / 2 were prepared by hot pressing sintering method using cobalt-coated nano-Al2O3 and TiC powders. The microstructure of the material was also established Schematic, from the interface point of view to analyze the reasons for the improvement of mechanical properties. Observation of the fracture surface morphology found that the formation of the intragranular structure, and observed the crack propagation path and crack bifurcation, deflection, bridging and so on.