配加铁粉对钒氮合金烧结过程的影响  

Effect of addition of iron powder on sintering process of vanadium-nitrogen alloy

作　　者：刘阳 徐靖 陈宇强 刘筱 LIU Yang;XU Jing;CHEN Yuqiang;LIU Xiao(School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学材料科学与工程学院,湖南湘潭411201

出　　处：《粉末冶金工业》2022年第4期17-24,共8页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(52105334);湖南省自然科学基金资助项目(2021JJ40206);湖南省重点研发计划资助项目(2022GK2043);湖南省教育厅优秀青年基金项目(21B0472)。

摘　　要：工业生产中,配加铁粉可大大提高钒氮合金产品的密度。为满足企业改进生产工艺、提升产品质量的需求,以工业V_(2)O_(5)粉、石墨粉和铁粉原料在推板窑中生产的钒氮合金产品为对象,研究了Fe在钒氮合金中的存在形式和对其烧结过程的影响,探讨了Fe的作用机理。结果表明,钒氮合金中Fe以Fe相形式存在,不规则夹杂分布在VN基体相之间;烧结过程中,Fe相在1200℃左右转变为液相,成为碳的一个液相扩散通道,碳热还原氮化反应由固固反应转变成固液反应,导致合金烧结的快速致密化发生;配加铁粉提高了钒氮合金产品致密度和含氮量,并降低其碳含量、氧含量。In industrial production, adding iron powder can greatly improve the density of vanadium-nitrogen(VN) alloy products. In order to meet the needs of enterprises to improve production process and product quality,taking the VN alloy products produced by industrial V_(2)O_(5)powder, graphite powder and iron powder raw materials in pusher kiln as the object, the existing forms of iron in VN alloy and its influence on its sintering process were studied, and the action mechanism of Fe was discussed. The results show that iron in VN alloy exists in the form of Fe phase, and irregular inclusions are distributed between VN matrix phases. In the sintering process, the Fe phase changes into liquid phase at about 1 200 ℃ and becomes a liquid diffusion channel of carbon. The carbothermal reduction nitridation reaction changes from solid-solid reaction to solid-liquid reaction, resulting in rapid densification of alloy sintering;Adding iron powder can improve the density and nitrogen content of VN alloy products, and reduce its carbon content and oxygen content.

关 键 词：V_(2)O_(5) 钒氮合金 铁粉 烧结致密化 碳热还原氮化反应 

分 类 号：TF124.5[冶金工程—粉末冶金]