ZrO_2含量对超重力下燃烧合成快速凝固Al_2O_3/ZrO_2(4Y)复合陶瓷的影响  

Effect of ZrO2 Content on Rapidly Solidified Composite Ceramic Al_2O_3/ZrO_2(4Y) Prepared by Combustion Synthesis under High Gravity

作　　者：杨权[1,2] 赵忠民[1] 张龙[1] 潘传增[1] 宋亚林 刘明军[2] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003 [2]武汉军械士官学校特种车辆教研室,武汉430075 [3]烟台警备区,烟台264000

出　　处：《机械工程材料》2009年第8期40-45,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50672131)

摘　　要：采用超重力下燃烧合成技术，以快速凝固方式制备了Al2O3／ZrO2（4Y）复合陶瓷，用XRD、SEM与EDS等研究了ZrO2含量对复合陶瓷显微结构和性能的影响。结果表明：当复合陶瓷中ZrO2质量分数在34．1％～46．4％时，复合陶瓷的显微结构主要为棒晶；当质量分数为49．6％～53．7％时，其显微结构主要为形状不规则的ZrO2球晶；随着ZrO2含量的增加，复合陶瓷的相对密度逐渐降低（最高可达94．3％），而硬度和断裂韧度均呈先增高后降低的趋势，当ZrO2质量分数为42．6％时，硬度和断裂韧度均达到最高值，分别为13．1GPa和13．5MPa·m^1／2。Based on combustion synthesis technology under high gravity to prepare rapidly solidified composite ceramic Al2O3/ZrO2（4Y）, the influence of ZrO2 content on microstructure and properties of solidified composite ceramics Al2O3/ZrO2（4Y） was investigated through XRD, SEM and EDS. The results show that the main microstructure of the ceramic was rod-shaped eutectic colonies as the ZrO2 content was in the range of 34.1% --46. 4 %, and the microstructure transformed to be isolated spherically-shaped ZrO2 grains as the ZrO2 content was in the range of 49.6%- 53. 7%. With the ZrO2 content increasing, the relative density of the ceramic decreased, the maximum value was 94. 3%, whereas the hardness and the fracture toughness increased first and then decreased. The maximum hardness value of the composite ceramic reached 13. 1 GPa as the ZrO2 content was 42. 6%, and the maximum fracture toughness value of 13. 5 MPa · m^1/2 was also obtained.

关 键 词：AL2O3/ZRO2(4Y) 燃烧合成 超重力 ZrO2含量 

分 类 号：E917[军事]