热压烧结燃烧合成Ti_3AlC_2粉体的研究  

Study on Sintering of SHS Ti_3AlC_2 Powders by Hot Pressing

作　　者：郭俊明[1] 戴志福[1] 刘贵阳[1] 刘杰[1] 陈克新[2] 周和平[2] 

机构地区：[1]红河学院理学院,云南蒙自661100 [2]清华大学材料系,北京100084

出　　处：《稀有金属材料与工程》2007年第A01期124-127,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50542005;90610011);云南省自然科学基金项目(2005C0078M;2006E0091M)

摘　　要：以燃烧合成Ti3AlC2粉体为原料,研究了不同热压温度下Ti3AlC2粉体的热压烧结过程。实验结果表明,热压烧结Ti3AlC2粉体可得到Ti3AlC2致密块体陶瓷,Ti3AlC2粉体的热压烧结活性比直接使用Ti、Al(或Al4C3)和C为原料热压烧结的活性高,热压烧结温度以1400～1500℃之间为佳;烧结温度为1450℃,压力25MPa,Ar保护,保温2h的条件下,烧结Ti3AlC2粉体可得理论相对密度为99.05%,维氏硬度2.8GPa,抗弯强度426.02MPa,断裂韧性10.08MPa·m1/2的烧结块体;烧结样品的密度和断裂韧性随烧结温度升高而增大,抗弯强度在高于1400℃时随热压温度升高而降低。Abstract： The dense polycrystalline Ti3AlC2 ceramics are produced by hot pressing using SHS Ti3AlC2 powders as starting materials. The sintered activation of the powders is better than using Ti, Al （or Al4C3） and C as raw materials by hot pressing. The optimal sintering temperatures of SHS Ti3AlC2 powders is from 1400 ℃ to 1500 ℃. The density, Vickers hardness, bending strength and fracture toughness of the Ti3AlC2 ceramics sample by hot pressing at 1450 ℃ for 2 h under pressure of 25 MPa and in Ar atmosphere are 99.50% of the theoretical value, 2.8 GPa, 426.02 MPa and 10.08 MPa·m^1/2, respectively. The densities and fracture toughnesses of sintered samples are increased with the increment of sintering temperature, but the bending strength are decreased above 1400 ℃.

关 键 词：TI3ALC2 热压 燃烧合成 三元碳化合物 显微结构 

分 类 号：TB383.3[一般工业技术—材料科学与工程]