V_(2)O_(5)对镁铝尖晶石质陶瓷材料烧结性能的影响  

Effect of V_(2)O_(5)on Sintering Performance of Magnesium Aluminum Spinel Ceramic Materials

作　　者：吉国荣 高云峰 丰铭 朱保顺 田玉明 Ji Guorong;Gao Yunfeng;Feng Ming;Zhu Baoshun;Tian Yuming(School of Materials Science and Engineering,Shanxi Institute of Science and Technology,Jincheng,Shanxi 048011;School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi 030024)

机构地区：[1]山西科技学院材料科学与工程学院,山西晋城048011 [2]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《非金属矿》2024年第3期91-93,98,共4页Non-Metallic Mines

基　　金：晋城市重点研发项目(20220102,20220104);校级项目(XKY010)。

摘　　要：为探究添加剂对镁铝尖晶石陶瓷材料烧结性能的影响及作用机理,以MgO和Al_(2)O_(3)为主要原料,V_(2)O_(5)为添加剂,采用固相烧结法合成镁铝尖晶石(MgAl_(2)O_(4))陶瓷材料。Al_(2)O_(3)、MgO质量比为2.55∶1,在体系中引入质量分数分别为1%、3%、5%、7%的V_(2)O_(5),分析烧结后试样的物相组成、微观形貌、显气孔率及力学强度。结果表明,当V_(2)O_(5)添加量低于5%时,V_(2)O_(5)与MgAl_(2)O_(4)晶体固溶,优先取代Al^(3+),添加量高于5%时,进而取代Mg^(2+),发生缺陷反应,降低扩散阻力,显著增强体系中离子的互扩散速率,促进MgAl_(2)O_(4)的反应烧结及晶体发育,但过量添加V_(2)O_(5)会导致V^(5+)来不及进入晶格而分布于MgAl_(2)O_(4)晶界处,反而阻碍了质点的迁移和扩散,抑制烧结过程,从而不利于提高烧结性能。In order to explore the effect of additives on the sintering properties of magnesia alumina spinel ceramic materials and the mechanism of action,MgAl_(2)O_(4)ceramic material was synthesized by solid phase sintering method with MgO and Al_(2)O_(3)as main raw materials and V_(2)O_(5)as additive.The mass ratio of Al_(2)O_(3)and MgO was 2.55∶1,and the mass fractions of V_(2)O_(5)introduced into the system were 1%,3%,5%and 7%,respectively.The phase composition,micromorphology,apparent porosity and mechanical strength of sintered samples were analyzed.The results show that the addition of V_(2)O_(5)is less than 5%,V_(2)O_(5)and MgAl_(2)O_(4)crystals preferently replace Al^(3+),and then replace Mg^(2+)when the addition of V_(2)O_(5)is more than 5%.The defect reaction reduces the diffusion resistance and significantly enhances the interdiffusion rate of ions in the system.The reaction and crystal development of MgAl_(2)O_(4)are promoted.When the addition of V_(2)O_(5)is excessive,V^(5+)has no time to enter the lattice,and is distributed at the grain boundary of MgAl_(2)O_(4),which hinders the migration and diffusion of particles,and inhibits the sintering process,which is not conducive to the improvement of sintering performance.

关 键 词：镁铝尖晶石 五氧化二矾 显微结构 抗折强度 

分 类 号：TB321[一般工业技术—材料科学与工程] TQ174[化学工程—陶瓷工业]