氟化镁对高纯氧化镁陶瓷烧结性能与微观结构的影响

发布时间：2018-06-12 12:43

本文选题：氧化镁 + 烧结性能　；参考：《辽宁科技大学》2015年硕士论文

【摘要】：随着钢铁、玻璃等高温行业的发展,氧化镁陶瓷因其良好的高温使性能广泛应用于这些行业。但是由于氧化镁的离子键特性使其熔点达到2800℃,从而导致氧化镁陶瓷制品的烧结温度普遍较高,在制备陶瓷制品时会消耗大量能源,并且对生产设备要求苛刻。因此在不影响氧化镁陶瓷使用性能的前提下降低其烧结温度尤为重要。本文从原料和添加剂两方面入手研究氧化镁陶瓷的烧结性能。首先,以菱镁矿为原料制备轻烧氧化镁,探讨温度和时间对MgO晶粒生长的影响,选择最佳晶粒生长温度与保温时间,并以此为理论基础选取高纯氧化镁为原料,并添加MgF2制备氧化镁陶瓷。通过测试体积密度、气孔率、硬度、X-射线衍射,SEM等,分析不同含量添加剂在不同温度下对氧化镁陶烧结性能的影响。得到以下结论:950℃时氧化镁晶粒生长速率常数为6.7669×106nm7/min,氧化镁晶粒在950℃下生长速率较快,且晶粒生长较为均匀;1500℃下MgF2添加量为3wt%时氧化镁陶瓷收缩率最小,1600℃下MgF2添加量为5wt%时促进烧结性能最好,晶届清晰,晶粒生长最为完整。
[Abstract]:With the development of iron and steel, glass and other high temperature industries, Magnesium Oxide ceramics have been widely used in these industries because of their good high temperature. However, because of the ionic bond properties of Magnesium Oxide, the melting point of the Magnesium Oxide ceramics can be reached to 2800 degrees C, which leads to the high sintering temperature of the Magnesium Oxide ceramic products, which will consume a large amount of energy in the preparation of the ceramic products. The production equipment is demanding. Therefore, it is very important to reduce the sintering temperature without affecting the performance of Magnesium Oxide ceramics. In this paper, the sintering properties of Magnesium Oxide ceramics are studied from two aspects of raw materials and additives. First, the light burned Magnesium Oxide is prepared with magnesite as raw material, and the influence of temperature and time on the growth of MgO grain is discussed. Select the best grain growth temperature and heat preservation time, and take this as the theoretical basis, select high purity Magnesium Oxide as the raw material, and add MgF2 to prepare Magnesium Oxide ceramics. By testing the volume density, porosity, hardness, X- ray diffraction, SEM and so on, the influence of different content additives on the sintering properties of Magnesium Oxide ceramics at different temperatures is analyzed. The following conclusions are obtained: 9 At 50 C, the growth rate constant of the Magnesium Oxide grain is 6.7669 x 106nm7/min, the growth rate of the Magnesium Oxide grain at 950 C is faster and the grain growth is more uniform. The shrinkage of Magnesium Oxide ceramics is the smallest when the amount of MgF2 is added at 1500 C at 3wt%. When the addition of MgF2 at 1600 C is 5wt%, the sintering performance is the best, the crystal growth is clear and the grain growth is the most complete.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.1

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