摘要
以超细Al_(2)O_(3)粉末为主要原料,添加一定量的氧化钇、氧化镧、氧化镁等烧结助剂,分别加入1号(5%聚乙烯醇A)、2号(5%阿拉伯树胶)和3号(2%聚乙二醇+6%聚乙烯醇B)粘结剂,在1500~1600℃下常压烧结制备氧化铝陶瓷。通过对Al_(2)O_(3)陶瓷样品的体积收缩率、体积密度、抗弯强度、维氏硬度、物相组成和显微结构等方面进行测试分析,对比研究了不同种类粘结剂和烧结温度对Al_(2)O_(3)陶瓷相关性能和显微结构的影响。结果表明:使用1号和3号粘结剂的陶瓷样品的硬度和强度随着烧结温度的增加而逐渐增大,均在1600℃达到最大值;使用2号粘结剂的陶瓷样品的硬度随着烧结温度的增加出现先增大再减小的变化趋势,在1550℃下达到最大值(892.5HV)。与2号和3号粘结剂相比,添加1号粘结剂在1600℃下所制备的Al_(2)O_(3)陶瓷样品的综合性能最佳,其抗弯强度和维氏硬度分别达到238.49 MPa和991.7HV。在该条件下所制备的Al_(2)O_(3)陶瓷样品呈块状断纹结构,可见样品断裂时晶粒拔出留下的痕迹,晶粒之间的界面结合非常紧密,赋予Al_(2)O_(3)陶瓷优异的综合性能。
Alumina ceramics were prepared by pressureless sintering at 1500~1600℃using ultrafine Al_(2)O_(3)powder as the main raw material,adding a certain amount of yttrium oxide,lanthanum oxide,magnesium oxide and other sintering aids,and adding No.1(5%polyvinyl alcohol A),No.2(5%gum arabic)and No.3(2%polyethylene glycol and 6%polyvinyl alcohol B)binders respectively.The effects of different kinds of binders and sintering temperature on the related properties and microstructure of Al_(2)O_(3)ceramics were comparatively studied by analyzing the volume shrinkage,bulk density,flexural strength,Vickers hardness,phase composition and microstructure of Al_(2)O_(3)ceramic samples.The results show that the hardness and strength of ceramic samples with No.1and No.3 binders increase with the increase of sintering temperature,and reach the maximum value at 1600℃.However,the hardness of ceramic samples with No.2 binder increases first and then decreases with the increase of sintering temperature,and reaches the maximum value(892.5HV)at 1550℃.Compared with No.2 and No.3binders,the Al_(2)O_(3)ceramic samples prepared by adding No.1 binder at 1600℃have the best comprehensive properties,and their flexural strength and Vickers hardness reach 238.49 MPa and 991.7HV,respectively.The Al_(2)O_(3)ceramic samples prepared under these conditions have a block-shaped broken grain structure,and the traces left by the grains pulled out when the samples are fractured can be seen.The interface between the grains is very closely bonded,giving the Al_(2)O_(3)ceramics excellent comprehensive properties.
作者
曹宇
胡继林
陈占军
刘哲皓
陈都
彭秧锡
CAO Yu;HU Jilin;CHEN Zhanjun;LIU Zhehao;CHEN Du;PENG Yangxi(Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials,School of Materials and Environmental Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China)
出处
《粉末冶金工业》
CAS
北大核心
2023年第5期119-124,共6页
Powder Metallurgy Industry
基金
湖南省重点研发计划资助项目(2021GK2015)。
关键词
粘结剂
氧化铝陶瓷
烧结助剂
力学性能
显微结构
binder
alumina ceramic
sintering aid
mechanical property
microstructure
