SiC微粉添加量对SiC耐磨材料结构和性能的影响  

Effect of SiC Micro-powder Addition on the Structure and Properties of SiC Wear-resistant Materials

作　　者：黄庆飞[1] 李文凤[1] 郭会师[2] 丁志静[1] 侯永改[1] 

机构地区：[1]河南工业大学材料科学与工程学院,郑州450001 [2]郑州大学高温材料研究所,郑州450052

出　　处：《人工晶体学报》2016年第11期2679-2682,共4页Journal of Synthetic Crystals

基　　金：河南工业大学高层次人才科研启动基金(150609);河南工业大学河南省省属高校基本科研业务费专项资金(31400722);校国自然申报支持(31400995)

摘　　要：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。SiC wear-resistant materials have been prepared with SiC micro-powder（5μm,the contents are 0wt%,1wt%,2wt%,3wt% and 4wt%,respectively） and three-graded SiC particles of the dense packing（particle sizes are 325 μm,212 μm,80 μm,and the mass ratio of them is 17 ∶ 7 ∶ 1,respectively） at the temperature of 1600 ℃ for 3 h.The effects of SiC micro-powder addition on the microstructure and properties of SiC wear-resistant materials are investigated.The results show that SiC micro-powder can promote the sintering densification and improve mechanical properties of SiC wearresistant materials.When the addition of SiC micro-powder is 3wt%,SiC wear-resistant materials can get the best performance,the bulk density and apparent porosity are 2.63 g/cm^3 and 7.62%,then the hardness,flexural strength and wear weight loss are 2458 HV,183 MPa and 0.26 g/min,respectively.The excellent sintering properties and mechanical properties can attribute to the effects of the SiC micropowder filling in the coarse SiC particles.The smaller particles with large surface energy can shorten the diffusion path and are beneficial to particle re-arrangement,so they guarantee the continuity of sintering network and increase the inter-particle bonding degree.

关 键 词：SIC微粉 SiC耐磨材料 力学性能 显微结构 

分 类 号：TQ174[化学工程—陶瓷工业]