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以ZrO2前驱体混合液作为浸渍液,莫来石毡为前驱体附着骨架,采用真空压力浸渍工艺制备出莫来石毡/氧化锆多孔复合材料。研究了不同烧结温度(1 300、1 350、1 400和1 450℃)下该多孔复合材料的物相组成、体积密度、开口气孔率、压缩强度及显微结构。结果表明,烧结之后的多孔复合材料发生了四方相氧化锆到单斜相氧化锆的转变,相转变过程直接导致较低烧结温度(1 300和1 350℃)下制备的多孔复合材料体积密度低于烧结前的;而在较高烧结温度下,晶粒间更加紧密联结并生长出大晶粒,材料致密化程度和压缩强度提高,其中,1 450℃烧结制备的多孔复合材料体积密度为2.16g/cm3,开口气孔率约为46.5%,平均压缩强度达到31.6MPa。
ZrO2 precursor composite was used as impregnating solution and mullite felt was used as precursors to attach the framework. The mullite felt / zirconia porous composite was prepared by vacuum pressure impregnation. The phase composition, bulk density, open porosity, compressive strength and microstructure of the porous composites were investigated at different sintering temperatures (1 300, 1 350, 1 400 and 1 450 ℃). The results show that the transformation of tetragonal zirconia to monoclinic zirconia occurs in the porous composite after sintering, and the phase transformation directly leads to the low bulk density of porous composites prepared at lower sintering temperatures (1 300 and 1 350 ℃) At the higher sintering temperature, the grains are more closely linked and grow large grains, the degree of material densification and compressive strength increase, of which, the bulk density of porous composites prepared by sintering at 1 450 ℃ is 2.16 g / cm3, open porosity of about 46.5%, the average compressive strength of 31.6MPa.