作　　者： ; ; ; ;

机构地区： 四川大学材料科学与工程学院

出　　处： 《硬质合金》 2008年第1期19-22,共4页

摘　　要： 采用等离子技术,在1600℃的温度和50 MPa的压力、不同保温时间的条件下实现TiN/AlN纳米复合粉的快速烧结。随着保温时间的延长,材料致密性有所改善,在保温15 min后获得最大密度,HRA=93,ρ=4.346 g/cm^3;随后由于颗粒的长大密度有所下降。XRD分析主相为TiN,局部温度过高导致氮缺位,晶格常数增大,衍射峰较烧结前略有左偏;次相为AlN,但由于在烧结过程中存在应力,其衍射峰较烧结前略有右偏,同时在烧结过程中有轻微氧化现象生成AlON相。用SEM分析了试样断口形貌,主要呈现沿晶断裂。 The SPS of TiN/AlN nanometer composite powder at different holding time in 1 600℃, 50 MPa were studied in this paper. The results show density of samples is improved with increasing of holding time, the highest density （0=4.346 g/cm3, HRA93） is obtained at holding 15 min, subsequently, it is reduced because of growing up the particles. X-ray diffraction show the main phase is TiN, the peak of TiN shift toward lower angle because of increases of lattice constants caused by the vacancy of nitrogen atom when the local temperature was too high, the second phase is AlN,the peak of AlN shift toward higher angle as the existing sintering stress and AIN is oxidized to AlON slightly.SEM of fracture surface of bulk displays brittleness broken along the crystal boundary.

关 键 词： 复合粉 烧结 高硬度

领　　域： [化学工程] [化学工程] [一般工业技术]