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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第12卷    第3期    总第48期    2002年6月

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文章编号:1004-0609(2002)03-0561-05
TiB-Ti基金属陶瓷的燃烧合成
汪建利1,张光胜1,张幸红2

(1.安徽机电学院 机械工程系,芜湖 241000;
2. 哈尔滨工业大学 复合材料研究所, 哈尔滨 150001
)

摘 要: 通过自蔓延高温燃烧合成,结合准热等静压工艺 (SHS/PHIP)制备了相对密度超过94%的TiB-xTi基金属陶瓷复合材料,研究了金属Ti含量对燃烧合成TiB-Ti基金属陶瓷复合材料的影响。研究结果表明:随着Ti含量的增加,绝热温度、燃烧温度和燃烧速度均降低,反应产物主要由TiB和Ti两相组成,部分产物还有TiB2相存在,产物组织中,TiB相主要有针状、棒状和片状等形态,增强相的尺寸随Ti含量的增加而减小;随Ti含量的增加,产物的抗弯强度、抗拉强度、抗压强度和断裂韧性提高,且在Ti含量为40%(质量分数)时达到最大值。

 

关键词: 燃烧合成;准热等静压;金属陶瓷;硼化钛

Combustion synthesis of TiB-Ti cermets
WANG Jian-li1,ZHANG Guang-sheng1,ZHANG Xing-hong2

1.Department of Mechanical Engineering,
Anhui Institute of Mechanical and Electronical Engineering,
 Wuhu 241000, China;
2.Center for Composite Materials,Harbin Institute of
Technology, Harbin 150001, China

Abstract:The TiB-Ti cermets with high relative density were fabricated by self-propagating high temperature synthesis and pseudo hot isostatic pressing (SHS/PHIP) process. The effect of Ti content on TiB-xTi cermets was investigated . The adiabatic temperatures,combustion temperatures and combustion velocity decrease with Ti content increasing for TiB-xTi system. The synthesized TiB-Ti cermets mainly consist of TiB and Ti phases,but little TiB2 phase exists in some products. TiB phase has three morphologies, i.e. needle-like,rod-like,plate-like,  in the microstructure of synthesized TiB-xTi composites. The size of TiB grain decreases with an increasing amount of metal addition. The introduction of Ti into TiB-xTi cermets results in a drastic increase in the bending strength,tensile strength,compression strength,fracture toughness, and the maximum value is obtained with the addition of 40%Ti(mass fraction). It is proved that 40% metal content is the optimal constituent for synthesized TiB-Ti cermets.

 

Key words: combustion synthesis; pseudo hotisostatic pressing; cermet; titanium boride

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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