粉末冶金技术2024，Vol.42Issue(2)：165-169,176,6.DOI:10.19591/j.cnki.cn11-1974/tf.2021090009
无压烧结SiC-金刚石多晶材料致密化及物理性能研究
Densification and physical properties of SiC-diamond polycrystalline materials produced by pressureless sintering
张秀玲 1陈宇红 2戚武彬 1张强 1海万秀2
作者信息
- 1. 北方民族大学材料科学与工程学院,银川 750021
- 2. 北方民族大学材料科学与工程学院,银川 750021||北方民族大学省部共建"粉体材料及特种陶瓷"重点实验室,银川 750021
- 折叠
摘要
Abstract
SiC-diamond polycrystalline materials doping by diamond with different mass fraction were prepared by pressureless sintering with AlN-Y2O3-Sc2O3 as liquid phase.The microstructure and thermal properties were analyzed by scanning electron microscopy and laser flash method,respectively.The effects of mass fraction(1.0%,2.5%,5.0%)and particle size(0.25 μm,1.00 μm)of diamond on the densification and mechanical properties of the SiC-diamond polycrystalline materials were studied.The results show that,the relative density of the sintered samples is over 94%when the diamond mass fraction is below to 5.0%,while the relative density of the sample with 5.0%diamond is lower than that of other samples.The relative density of SiC polycrystalline materials decreases with the increase of diamond content,and the excessive diamond in raw materials may reduce the densification of samples.Under the experimental conditions,the grain size does not grow abnormally.The hardness,fracture toughness,and bending strength of the samples are in ranges of 16～18 GPa,3.8～4.4 MPa·m1/2,and 239～540 MPa,respectively.The thermal conductivity and thermal diffusion coefficient of samples decrease with the increase of temperature,and the porosity is the main factor affecting the thermal conductivity of the sintered samples.关键词
碳化硅多晶材料/无压烧结/致密化/液相/力学性能/热性能Key words
SiC polycrystalline materials/pressureless sintering/densification/liquid phase/mechanical properties/thermal properties分类
矿业与冶金引用本文复制引用
张秀玲,陈宇红,戚武彬,张强,海万秀..无压烧结SiC-金刚石多晶材料致密化及物理性能研究[J].粉末冶金技术,2024,42(2):165-169,176,6.
