自蔓延高温合成TiB_2+Al_2O_3/NiAl复合材料  

SHS of Al_2O_3+TiB_2/NiAl Compound Composites

作　　者：黑鸿君[1] 崔洪芝[1] 谢艳春[1] 张金玲[1] 袁建军[1] 曹丽丽[1] 张海波[1] 

机构地区：[1]山东科技大学材料科学与工程学院,青岛266510

出　　处：《山东陶瓷》2007年第6期3-6,共4页Shandong Ceramics

摘　　要：Al2O3+TiB2复相陶瓷材料具有金属材料无法比拟的高硬度、高熔点、高导热、低膨胀系数、高耐磨性、高温化学稳定性等优良的性能,但由于两种材料都属于硬而脆的材料,复合后仍然存在脆性大、裂纹敏感性强、抗机械冲击性和温度急变形差等缺点。为了克服这些缺点,本文探索了在陶瓷相中添加金属间化合物(NiAl或FeAl)。X射线衍射结果表明合成产物的主要组成相分别为Al2O3+TiB2、Al2O3+TiB2+NiAl及Al2O3+TiB2+FeAl,反应按预期进行,且燃烧合成反应进行的较为彻底。通过对不同成分反应产物的致密度、强度、断裂韧性对比,可知产物的致密度在FeAl含量为15%时达到最高99.5%,Al2O3+TiB2+NiAl体系中NiAl含量为20%达到最高98.5%。随金属间化合物含量的增加,合成复合材料的硬度下降,而断裂韧性提高。Al2O3＋TiB2 composite ceramic materials have much more excellent performances： high hardness, high melting-- point, high-- thermal conductivity, low-- expansion coefficient, high-- wearing feature, pyrochemistry stability and so on, which metal material is unable to achieve. But both of them belong to hard brittle materials, they still have some shortcomings, iust as high brittleness, strong crack--sensitivity, weak of mechanical impact properties and temperature deformation. In order to improve these shortcomings, in this page NiAl and FeAl intermetallic compounds were appended to the composite ceramics. As the result of the XRD picture, Al2O3＋TiB2, Al2O3-TiB2 ＋NiAl and Al2O3＋TiB2 ＋FeAl are the maior phase composition, which indicated that SHS reactions were thoroughly processed. Over passing the comparison of the density, hardness and fracture toughness property of the reaction products with different component, the tiptop of the density is 99.5% when the content of FeAl is 15%, while it is 98. 5% when the content of NiAl is 20%. The more content of NiAl and FeAl intermetallic compound, the lower hardness and the higher fracture toughness of the synthetical composites.

关 键 词：自蔓延高温合成 Al2O3+TiB2复相陶瓷 金属间化合物 NIAL FEAL 

分 类 号：TB33[一般工业技术—材料科学与工程]