摘要
以微米MgO(AR)为主要原料,纳米SiO_2(AR)为添加剂,制备镁基陶瓷材料,旨在提高MgO陶瓷烧结性能。通过XRD和SEM等检测手段对煅烧后试样的物相组成和微观结构进行表征,重点研究添加剂SiO_2对MgO陶瓷的物相组成、结构及相对密度影响。结果表明:添加SiO_2对MgO陶瓷基体起到促烧作用。随着SiO_2加入量的增加,烧后试样的相对密度和烧后线变化率呈先增大后减小趋势。加入4mol%的SiO_2,经1550℃煅烧后试样相对密度达到96.5%;引入的SiO_2与基体中的MgO生成M_2SO_4新相,同时钉扎在方镁石晶界及晶界气孔处,通过抑制方镁石相的晶界移动,进而阻碍方镁石晶粒的长大,促进了基体致密化程度。
To improve the sintering properties of MgO-based ceramic, it was prepared from micron-sized MgO as the main raw material and nano- SiO2 as additive. The phase composition and microstructure of sintered samples were characterized by X-ray diffraction and scanning electron microscopy, respectively.The effect of SiO2 additive on the composition, structure and relative density of MgO-based ceramic were investigated. The results show that the sintering properties of MgO-based ceramic could be promoted by introducing SiO2, the relative density and linear dimension change rate of the sintered sample firstly increase and then decrease with SiO2 additive increasing. The relative density of the sample introduced with 4 mol % SiO2 sintered 1550 ℃ reach 96.5%. MgO reacted with SiO2 to form forsterite, forsterite grain pined the periclase grain boundary and pores at the grain boundary, the grain boundary migration of its periclase phase could be hindered, it prevent the grain growth of periclase and the degree of densification increase.
作者
冯东
罗旭东
张国栋
谢志鹏
FENG dong LUO Xu-dong ZHANG Guo-dong XIE Zhi-peng(School of High Temperature Materials and Magnesium Resource Engineering,University of Science and Technology Liaoning,Anshan 114051,China State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering,Tsinghua University,Beijing 100084 ,China)
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第9期2306-2310,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(51402143)
辽宁省自然基金(601009802)
