论文部分内容阅读
以紧密堆积的三级配SiC颗粒(粒径为325μm、212μm、80μm,质量比为17∶7∶1)为基础配方,将0wt%、1wt%、2wt%、3wt%和4wt%且粒径为5μm的SiC微粉添加到SiC耐磨材料中,经1600℃保温3 h烧制,研究了SiC微粉添加量对SiC耐磨材料结构和性能的影响。结果表明:SiC微粉可促进SiC耐磨材料的烧结致密化,并改善其力学性能,当其添加量为3wt%时,试样的综合性能较优,其体积密度和显气孔率分别为2.63 g/cm3和7.62%,硬度、抗折强度和磨损量分别为2458 HV、183 MPa和0.26 g/min。SiC耐磨材料烧结性能和力学性能的提高可归因于SiC微粉充填在SiC颗粒间,缩短了扩散传质路径,且较小粒径的SiC微粉具有较大的表面能,烧结时易于晶粒重排,保证了烧结网络的连续性,增大了颗粒间的结合程度。
Based on the closely packed three-stage SiC particles (325μm in diameter, 212μm in diameter and 80μm in mass ratio of 17: 7: 1), 0wt%, 1wt%, 2wt%, 3wt% and 4wt% 5μm SiC powder was added to the SiC wear-resistant material, and then sintered at 1600 ℃ for 3 h. The effect of SiC powder addition on the structure and properties of SiC wear-resistant material was studied. The results show that the SiC powder can promote the sintering densification of SiC wear-resistant material and improve its mechanical properties. When its addition amount is 3wt%, the comprehensive properties of the sample are better. The bulk density and apparent porosity are 2.63 g / cm3 and 7.62%, hardness, flexural strength and wear were 2458 HV, 183 MPa and 0.26 g / min. Sintering properties and mechanical properties of SiC wear-resistant materials can be attributed to the SiC particles filled in the SiC particles, shortening the diffusion mass transfer path, and the smaller size of the SiC powder has a larger surface energy, sintering easy to grain Rearrangement, to ensure the continuity of the sintered network, increasing the degree of integration between particles.