摘要
以化学计量配比的Ti,B元素为原料,在高温高压条件下成功制备出颗粒均匀、致密性大于99%的二硼化钛(TiB_2)体材料.物性测试结果表明:TiB_2的维氏硬度高达39.6GPa(接近超硬材料的40GPa);并呈现出金属导电特性,电阻率在10^(-8)Ω.m的数量级(接近TiB_2单晶样品值).TiB_2的高硬度与金属特性,可能与该方法制备的TiB_2体材料中均匀的细小晶粒尺寸有关.该方法为制备功能陶瓷材料提供了新的思路.
Bulk titanium borides （TiB2） have been successfully synthesized from the stoichiometric boron and titanium powders at high pressure and high temperature （HPHT）. The density of TiB2 is higher than 99%. The Vicker＇s hardness of TiB2 as synthesized is 39.6 GPa which is near to result of the supehard materials. While TiB2 show good metallic characters with the resistivity, 10-8 Ωm, which is near to the value of the single crystal of TiB2. The enhanced properties of TiB2 as synthesized may be attributed to the higher density and uniform crystal size.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第2期483-489,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:51172091
51032001
91022029)
国家基础科学人才培养基金(批准号:J1103202)
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关键词
TIB2
高温高压
维氏硬度
titanium borides, high pressure and high temperature, vicker＇s hardness
