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1995, 05,
ZTA陶瓷ZrO2的韧化机制与断裂特征
基金项目(Foundation): 国家自然科学基金资助项目
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摘要:

选用无压烧结和热压烧结两种系列不同成分配比的ZrO_2韧化Al_2O_3(ZTA)陶瓷,在较宽的力学性能范围内研究7rO2的韧化机制对材料强度、韧性的贡献及其与断裂特征之间的关系。压痕裂纹揭示出ZrO_2的不同韧化机制有不同的开裂特征:微裂纹韧化的材料,压痕裂纹弯曲行进,并且沿着m-ZrO_2颗粒与基体的交界面扩展;相变韧化的材料,压痕裂纹穿越t-ZrO_2颗粒。此特征能很好地解释:微裂纹韧化可以提高材料的断裂韧性,但有可能降低材料的断裂强度,相变韧化既可以提高材料的断裂韧性,又可以提高材料的断裂强度。

关键词:
Abstract:

Two series of ZTA ceramics ( sintered with and without hot-pressing) of different compositionwere chosen to analyze the contributlon of the toughening mechanisms of ZrO2 to the fracture strength and thefracture toughness of the materials and to study the relationship between the toughening rnechanism and fracturecharacteristics of ZrO2. Indentation cracks show that different totighening mechanisms can produce differentcrack paths: crack propagations are deflected and branched alonig the m-ZrO2 particle-matrix interfaces for mate-rials toughened by microcracks ; crack propagations can go through t-ZrO2 grains for materials toughened bytransformation. The two cracking characteristics can be used to explain the following facts : microcrack toughen-ing can increase the fracttire toughness , but may decrease the fracture strength ; transformation toughening cannot only raise greatly the fracture toughness but also increase the fracture strength.

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参考文献

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基本信息:

中图分类号:TQ174.15

引用信息:

[1]梁开明,顾扣芬,顾守仁,孙传水.ZTA陶瓷ZrO_2的韧化机制与断裂特征[J].硅酸盐学报,1995(05).

基金信息:

国家自然科学基金资助项目

发布时间:

1995-10-26

出版时间:

1995-10-26

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