摘要
本文探讨了3Y-ZrO2添加量及烧结温度对Al2O3陶瓷组成、微观结构、力学和防弹性能的影响。结果表明,随烧结温度的升高,添加3Y-ZrO2的Al2O3陶瓷的体积密度先增加后降低,表观气孔率的变化趋势相反,1550℃时,试样具有最高的体积密度和最低的气孔率,添加相通过钉扎作用促进Al2O3晶粒的细化,提高基体的烧结活性;添加后Al2O3陶瓷中主要包含a-Al2O3及少量的Tetragonal和MonoclinicZrO2,随3Y-ZrO2添加量增加,其在Al2O3中的分散均匀性先增加,后降低,当添加量为1.5%时,分散性最佳;当烧结温度从1450℃增加到1650℃时,试样的弯曲强度、维氏硬度和断裂韧性均先升高后降低,4#试样在1550℃具有最佳的力学性能,其弯曲强度为345.03 MPa、断裂韧性3.87 MPa×m^1/2,维氏硬度为1572.8MPa,优异的性能得益于3Y-ZrO2在Al2O3陶瓷中的均匀分布以及裂纹扩展时发生的T-M相变增韧。当Al2O3陶瓷的主要参数(包括:密度、弯曲强度、硬度和断裂韧性和厚度)的数值乘积大于4.49×10^7时,陶瓷片的防弹性能满足五级防护要求。
The effects of 3Y-ZrO2 and sintering temperature on composition,microstructure,mechanical properties and bulletproof properties of AI2O3 ceramics were studied.With increasing sintering temperature,the density of the Al2O3 ceramics with 3Y-ZrO2 was increased first and then decreased.At 1550℃,the sample has the highest density and the lowest porosity.The added particles can promote the refinement of A12O3 grains through pinning and improve the sintering activity.The AI2O3 ceramics mainly contain a-Al2O3 phase and a small amount of tetragonal and monoclinic ZrO2.With increasing content of 3Y-ZrO2,its dispersion uniformity in the Al2O3 matrix was increased first and then decreased.As the content is 1.5%,the dispersion uniformity is the highest.When the sintering temperature was increased from 1450℃to 1650℃,the bending strength,Vickers hardness and fracture toughness of the sample are all increased first and then decreased.The sample sintered at 1550℃has the highest mechanical properties,with a bending strength of 345.03 MPa,a fracture toughness of 3.87 MPa·m^1/2 and a Vickers hardness of 1572.8 MPa.The high mechanical properties are attributed to the uniform distribution of the 3Y-ZrO2 phase in the Al2O3 matrix and the T-M transformation toughening effect.When the product of the main parameters of the Al2O3 ceramics(including density,bending strength,hardness,fracture toughness and thickness)is larger than 4.49×10^7,the bulletproof of the ceramic chip meets the five level protection requirements.
作者
王玲
颜进
高朋召
谢志勇
许涛
高波
肖汉宁
WANG Ling;YAN Jin;GAO Pengzhao;XIE Zhiyong;XU Tao;GAO Bo;XIAO Hanning(College of Materials Science and Engineering,Huna University,Changsha 410082,Hunan,China;Hunan Zhongtai Special Equipment Co.,LTD,Linli 415211,Hunan,China;Hefei Cement Research and Design Institute Co.,Ltd.,Hefei,230051,Anhui,China)
出处
《陶瓷学报》
CAS
北大核心
2020年第2期219-227,共9页
Journal of Ceramics
基金
湖南省自科基金项目(2018JJ4011)
安徽省重点研究和开发计划项目(1804a09020080)。
关键词
AL2O3陶瓷
微观结构
力学性能
防弹性能
力学判据
Al2O3 ceramics
microstructure
mechanical property
bulletproof property
mechanical criterion
