Reliability of layerecl ceramics composites

陶瓷具有高强度、耐高温和高耐腐蚀性。然而，其固有的脆性成为影响其实际应用的一大问题。本研究的目的是利用层合技术开发实用的结构用材料，以提高材料的韧性。制备了陶瓷/陶瓷和陶瓷/玻璃材料，并对其力学性能进行了测试，分析了其微观断裂过程。结果表明，优化后的较大厚度和界面强度可以提高材料的韧性，而要提高韧性，脆性材料的组合是必要的。研制了陶瓷/金属层合板材料，并对其力学性能进行了分析。铝/氧化铝层板材料是在氧化铝板材流延成型后，采用真空扩散法制备的。给出了裂纹扩展阻力曲线。韧性值比单块氧化铝高五倍。用铝的应力-应变曲线也可以预测其R曲线行为。

Ceramics have a high strength, high temperature and high corrosion resistance. However, its intrinsic brittleness becomes a big problem for practical application. The objection of this research is to develop the practical materials for structural application to improve the toughness of materials using the technique of laminating. We produced the ceramics/ceramics and ceramics/glass materials and measured the mechanical properties and analied the micro fracture process. It was demonstrated that optimized lager thickness and interfacial strength could enhance the toughness of materials.To improve the toughness, the combination of brittle materials has alimifatiom. Also we developed the ceramics/metals laminate materials and analysed the mechanical properties. The aluminum/alumina laminate materials were fabricated by vacuum diffusion method after alumina sheets by tape casting. The crack propagation resistance curve demonstrated. The five times higher value of toughness compared with monolithic alumina. The R-curve behavior could be also predicted using stress-strain curve of aluminum.