Abstract:

In order to study the properties of zirconia products prepared from sintered porous zirconia aggregates,specimens were prepared using self-made sintered porous zirconia aggregates and municipal bubble zirconia as the aggregates,fused zirconia fine powder and zirconia micropowder as the matrix,water-soluble resin as the binder,hydraulic shaped,dried at 110 ℃,and then fired in a gas kiln at 1 800 ℃ for 6 h.The properties of the specimens were tested and the microstructure was analyzed.The results show that the specimen prepared with sintered porous zirconia aggregates has moderate bulk density and high cold crushing strength,and the hot modulus of rupture is equivalent to that of the specimens prepared using bubble zirconia as the aggregates,and the creep rate and the thermal conductivity are high.SEM analysis shows that the sintered aggregates have better bonding with zirconia matrix,which is the main reason for the strength increase,and the dispersed small pores are beneficial to blocking the heat conduction.

Key words: zirconia, sintered raw materials, light-weight aggregates, thermal conductivity, bubble brick

摘要：

为研究烧结氧化锆多孔骨料为原料制备氧化锆制品的性能,分别以自制烧结氧化锆多孔骨料和市售氧化锆空心球为骨料,电熔氧化锆细粉和氧化锆微粉为基质,水溶性树脂为结合剂,液压成型试样经110 ℃干燥后于燃气窑内1 800 ℃保温6 h烧成,检测了烧后试样的性能,分析了烧成试样的显微结构。结果表明:采用烧结氧化锆多孔原料为骨料制备的试样具有适中的体积密度和较高的常温耐压强度,高温抗折强度与氧化锆空心球为骨料试样的相当,压蠕变率和热导率较高。SEM分析表明,烧结骨料颗粒与氧化锆基质具有更好的结合性,是其强度提高的主要原因,弥散性小气孔有利于阻隔热量的传播。

关键词: 氧化锆, 烧结原料, 轻质骨料, 热导率, 空心球砖