V2O5对镁铝尖晶石质陶瓷材料烧结性能的影响
Effect of V2O5 on Sintering Performance of Magnesium Aluminum Spinel Ceramic Materials
吉国荣 1高云峰 1丰铭 1朱保顺 1田玉明2
作者信息
- 1. 山西科技学院 材料科学与工程学院,山西 晋城 048011
- 2. 山西科技学院 材料科学与工程学院,山西 晋城 048011;太原科技大学 材料科学与工程学院,山西 太原 030024
- 折叠
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Al2O3 为主要原料,V2O5 为添加剂,采用固相烧结法合成镁铝尖晶石(MgAl2O4)陶瓷材料.Al2O3、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V2O5,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V2O5 添加量低于5%时,V2O5 与 MgAl2O4 晶体固溶,优先取代 Al3+,添加量高于5%时,进而取代Mg2+,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 MgAl2O4 的反应烧结及晶体发育,但过量添加 V2O5 会导致V5+来不及进入晶格而分布于 MgAl2O4 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.
Abstract
In order to explore the effect of additives on the sintering properties of magnesia alumina spinel ceramic materials and the mechanism of action,MgAl2O4 ceramic material was synthesized by solid phase sintering method with MgO and Al2O3 as main raw materials and V2O5 as additive.The mass ratio of Al2O3 and MgO was 2.55∶1,and the mass fractions of V2O5 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 V2O5 is less than 5%,V2O5 and MgAl2O4 crystals preferently replace Al3+,and then replace Mg2+when the addition of V2O5 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 devel-opment of MgAl2O4 are promoted.When the addition of V2O5 is excessive,V5+has no time to enter the lattice,and is distributed at the grain boundary of MgAl2O4,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Key words
magnesium-aluminum spinel/vanadium pentoxide/microscopic structure/flexural strength引用本文复制引用
基金项目
晋城市重点研发项目(20220102)
晋城市重点研发项目(20220104)
校级项目(XKY010)
出版年
2024
NETL
NSTL
万方数据