Reliability of layerecl ceramics composites

陶瓷具有高强度、高温和高耐腐蚀性。然而，其固有脆性成为实际应用中的一个大问题。本研究的目的是开发实用的结构材料，利用层压技术提高材料的韧性。制备了陶瓷/陶瓷和陶瓷/玻璃材料，测量了其力学性能，分析了其微断裂过程。结果表明，优化层厚和界面强度可以提高材料的韧性。为了提高韧性，脆性材料的结合具有一定的局限性。开发了陶瓷/金属复合材料，并对其力学性能进行了分析。采用真空扩散法制备了铝/氧化铝复合材料。给出了裂纹扩展阻力曲线。韧性值比单片氧化铝高5倍。用铝的应力-应变曲线也可以预测r曲线的行为。

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.