无压烧结制备透辉石增韧补强氧化铝基结构陶瓷材料.pdf

第27卷第2期
粉末治金技术
2009年4月
Powder Metallurgy Technology
Apr 2009
无压烧结制备透辉石增韧补强氧化铝
基结构陶瓷材料
刘长霞)孙军龙张希华2)
1)(鲁东大学先进制造与自动化技术重点实验室,山东烟令264025)
2)(山东大学材料科学与工程学院,济南250061)
摘要:采用温度梯度无压烧结工艺制备了透辉石增初补强Al2O3基结构陶瓷材料,探讨了其烧结致密化
特性,对无压烧结后材料的硬度、断裂韧度和抗弯强度进行了测试和分析;分析了复合材料力学性能随透辉石
含量变化的关系;探讨了复合材料断面断裂方式的变化对其力学性能的影响。与纯Al203相比,透辉石/
Al203复合材料的力学性能得到明显提高,其中AD[97%AI203+3%(体积分数)透辉石]综合力学性能较
好,其硬度、抗弯强度和断裂韧度分别为15.57CPa、417MPa和S.2MPa?m2。力学性能提高的主要原因是
添加相与Al203基体之间界面反应的发生以及透辉石对复合材料的晶粒细化效应。
关键词:氧化铝;透辉石;结构陶瓷;无压烧结
Fabrication of diopside toughened alumina matrix structural ceramic
materials by pressureless sintering process
Liu Changxia Sun Junlong, Zhang Xihua
1)(Key Laboratory of Advanced Manufacturing Automation Technolo
University, Yantai Shandong 264025, China)
2)(School of Materials Science and Engineering, Shandong University, Ji'nan 250061, China)
Abstract Diopside toughened alumina matrix structural ceramic materials was developed by using the technology of
temperature gradient pressureless sintering. The sintering densification characteristics of the composites were studied
in this paper. The hardness, fracture toughness and bending strength of the composites were tested. Meanwhile, the
relations of volume content of diopside and mechanical properties of alumina matrix structural ceramic materials were
analyzed. The effect of fracture mechanism on the mechanical properties of the composites was studied. Results show
that, the mechanical properties of diopside/Al 0, composites are significan ly improved compared with pure alumina.
AD specimen(97 vol. AL, +3 wol. diopside ) with hardness of 15. 57 Gpa, strength of 417 Mpa and
toughness of 5. 2 Mpa.m", shows excellent performances. Interface reactions between the additives and alumina
matrix and the good grain refining effect of diopside on alumina contribute to the improvement in mechanical
properties.
Key words: alumina; diopside; structural ceramics; pressureless sintering
目前,A2,O3基结构陶瓷材料的制备主要依靠异性。因此,能够批量生产、装置大型化且低成本的
热压,其制品形状简单,生产效率低;烧结制品的微无压烧结便成为制备大尺寸Al203基结构陶瓷材料
观结构具有各向异性,导致其使用性能也具有各向的优选工艺。为了在无压烧结工艺下获得性能优良
鲁东大学引进人才基金(LY20074303,LY20074302);山东省自然科学基金(Y2007F29)
*刘长霞(1978-),女,讲师。E-mail.hester5371@yahoo.com.cn.
收稿日期:2008-01-02