低温烧结空心微珠多孔陶瓷及其性能研究-材料学专业论文.docxVIP

中北大学学位论文 中北大学学位论文 万方数据 万方数据 孔陶瓷的表观密度降低效果显著。其中工艺 2 制备的空心微珠多孔陶瓷随着烧结温度的 升高，表观密度降低的更多。烧结温度为 650oC 时，样品中气孔为孔径较小的连通孔， 工艺 1 和 2 制备的样品的表观密度分别为 0.90 和 1.21 g/cm3，当烧结温度为 800oC 时， 样品中气孔孔径迅速增大，工艺 1 和 2 制备的样品的表观密度分别为 0.30 和 0.21 g/cm3， 工艺 2 制备的样品抗压强度为 0.59 MPa。 4. 在工艺 2 的基础上添加 MgCO3 制备空心微珠多孔陶瓷，研究了外加剂 MgCO3 对空心微珠多孔陶瓷的性能影响规律。研究结果表明：随烧结温度的升高，添加 MgCO3 使空心微珠多孔陶瓷的表观密度逐渐降低，样品中气孔的孔径逐渐增大。烧结温度为 650oC 时，样品的表观密度为 1.22 g/cm3，烧结温度为 800oC 时，样品的表观密度降低为 0.21 g/cm3，抗压强度为 1.27 MPa，平均体积吸水率 5.81%。采用工艺 2 添加沸石粉和 MgCO3 后制备的多孔陶瓷样品，烧结温度为 800oC，样品的表观密度同为 0.21 g/cm3， 但添加 MgCO3 后制得的样品的气泡数量更多，孔径更小，孔径分布更均匀，抗压强度 更高。 关键词：空心微珠，多孔陶瓷，表观密度，微观结构，抗压强度 V Study on properties of porous ceramics prepared by hollow sphere at low temperature sintering Abstract China is a country with rich mineral resources, but per capita relative shortage of resources. Low utilization rate of the ore resource lead to a serious waste of resources. High value-added development and utilization of mineral resources are important for releasing the contradiction between economic growth and resource shortages. Inorganic hollow sphere is a new type of light industrial base material, with its unique characteristics, such as low density, high strength, low thermal conductivity, low water absorption, high dispersion, electrical insulation and good thermal stability , et al. In this paper, natural mineral powders were used as raw materials to fabricate hollow sphere by particle stabilized foamed slurry and spray drying technology, then hollow spheres were used to fabricate hollow sphere porous ceramics with low density and high strength by sintering at a low temperature. The microstructure and mechanical properties of hollow sphere ceramics were investigated. The main research conclusions are as follows: The effect of sintering temperature on porosity formation mechanism and properties of porous ceramics was investigated. The results show that porous ceramics can be prepared at low sintering temperatures (650-860oC). With the increase of sintering te