鳞片石墨/3Y-TZP复合陶瓷烧结及其力学性能  

Sintering and Mechanical Properties of Flake Graphite/3Y-TZP Composite Ceramics

作　　者：孙春阳 罗志安[1] 黄奥[1] 张美杰[1] 顾华志[1] Sun Chunyang;Luo Zhian;Huang Ao;Zhang Meijie;Gu Huazhi(Wuhan University of Science and Technology,Wuhan,430081)

机构地区：[1]武汉科技大学材料与冶金学院,武汉430081

出　　处：《陶瓷》2018年第10期40-44,共5页Ceramics

摘　　要：以十二烷基苯磺酸钠(SDBS)为分散剂制备FG/3Y-TZP复合粉体,并且把复合粉体进行二次工艺酒精浮选处理,采用氩气气氛常压高温烧结,制备系列FG/3Y-TZP复合陶瓷。研究鳞片石墨(FG)含量和浮选工艺对复合陶瓷材料的物相、显微结构的影响;建立了材料显微结构与其体密和断裂韧性的相互关系,讨论了浮选处理的FG/3Y-TZP复合陶瓷的增强、增韧机理。结果表明:制备的FG/3Y-TZP在高温烧结后均为四方相;浮选工艺对所制备样品的显微结构和性能有显著影响。随着浮选时间的提高,样品致密度也提高,晶粒进一步长大;在FG含量为1.5%左右时,致密度和抗折性能均达到峰值。而浮选工艺的引入,则进一步使氧化锆表面附着的鳞片石墨变小变薄,一方面填充气孔,另外还有助于提高鳞片石墨活性,使复合材料的晶界处阻碍裂纹产生或者扩展;但是由于分散性和含量问题,随着鳞片石墨含量的提高,致密度和断裂韧性在急剧下降。FG/ 3Y-TZP composite powders with different flake graphite （FG） content were prepared with sodium dodecyl benzene sulfonate （SDBS） as dispersant, and the composite powders were re alcohol flotation. The effect of flotation process on the physical phase and microstructure of composite ceramic materials was studied.The relationship between the microstructure of the material and its density and fracture toughness was established.The results showed that the FG / 3Y-TZP were all square phases after sintering at different tcmperatures.The flotation process has significant influence on the microstructure and properties of the samples.With the increase of sintering temperature, the density of samples increased, and the grain grew further.The introduction of floatation technology further reduces and thins the scale graphite attached to the surface of zirconia. On the one hand, the pores arc filled in, and the activity of the flake graphite is increased, so as to inhibit the grain growth and prevent the crack from occurring or spreading. However, due to the problem of disersibility and content, the density and fracture toughness of flake graphite decreased sharply with the increase of the content of flake graphite.

关 键 词：鳞片石墨 复合陶瓷 浮选 强韧化 

分 类 号：TQ174.758.22[化学工程—陶瓷工业]