摘要
以方镁石-尖晶石微孔陶瓷骨料、电熔镁砂、电熔尖晶石、-αAl2O3微粉等为原料,制备含轻骨料镁尖晶石材料,研究了烧成温度和锆英石加入量对试样性能和显微结构的影响。结果表明,随着烧成温度的升高,试样的致密化程度逐步提高;试样强度先增大后减小,在1 600℃时达到最大值。在1 600℃热处理下,随着w(ZrSiO4)的增加,试样的体积密度增大,显气孔率变小,试样力学强度在w(ZrSiO4)为4%时达到最大值。w(ZrSiO4)为4%的试样整体显微结构致密,固相直接结合程度提高;并且方镁石和尖晶石晶粒的晶粒尺寸粗大,晶粒发育比较完整。
Effects of calcination temperature and zircon addition （0, 2%, 4%, 6%, 8%） on the properties and microstructures of magnesia-spinel refractories containing lightweight aggregates were studied using magnesia-spinel microporous aggregate, fused magnesia, fused spinel, α-Al2O3 micro powder as starting materials. The result shows that the densification of the samples improves with calcination temperature; the strength increases with temperature before 1 600 ℃, after which the strength decreases with temperature..After fired at 1 600 ℃, with the increase of zircon addition the bulk density of the samples increases while apparent porosity decreases. When zircon addition is 4 %, the strength is the best, and the photomicrograph of the sample exhibits a densely packed microstructure, with larger and better developed grains of periclase and spinel. Meanwhile, the direct bonding of solid phases is reinforced.
出处
《武汉科技大学学报》
CAS
2009年第1期78-81,共4页
Journal of Wuhan University of Science and Technology
关键词
烧成温度
锆英石
镁尖晶石
显微结构
calcination temperature
zircon
magnesia-spinel
microstructure
