摘要
通过反应烧结成功地制得了in-situ SiC/MOSi_2复合材料,该复合材料的组织均匀致密,相对密度达97.8％,强化相SiC的粒径小于1μm,体积分数为19.8％.复合材料室温抗弯强度为542MPa,断裂韧性5.21MPa·m^(1/2),维氏硬度12.21 GPa;在1200℃和1400℃时的抗压强度为596MPa和175MPa,800℃时的维氏硬度为8.2 GPa.在Al_2O_3和SiC磨盘上表现出优异的耐磨性能。
SiC particle reinforced molybdenum disilicide matrix composite(SiC/MoSi_2 ) was fabricated by in-situ reaction sintering process successfully. The phase constituent of in-situ SiC/MoSi_2 composite is uniform and dense with a relative density of about 97.8 %. The grain-size of SiC is smaller than 1μm and the volume fraction is 19.8%. The strength, fracture toughness and vickers hardness at room temperatue are 542 MPa, 5.21 Gpa and 12.21 GPa, respectively. Compressive yield strength of the composite decreases from 596 MPa (1 200℃) to 175 MPa (1 400℃), Vickers hardness at 800℃ is 8.2 GPa. The wear resistance of the composite abraded on Al_2O_3 and SiC grind wheel is very excellent.
出处
《粉末冶金材料科学与工程》
EI
2000年第3期215-221,共7页
Materials Science and Engineering of Powder Metallurgy
关键词
二硅化钼
复合材料
原位生长
SIC
力学性能
molybdenum-disilicide
composite material
reaction sintering
silicon carbide
mechanical property
