关键词: 稳定剂, 氧化锆空心球, 线膨胀率, 热导率, 抗热震性

Abstract: In order to prepare high purity zirconia bubble products with better heat insulation performance,high purity zirconia bubble refractories with different types of stabilizers were prepared using CaO stabilized zirconia bubble particles and powder,Y₂O₃ stabilized zirconia bubble particles and powder,or CaO+Y₂O₃ stabilized zirconia bubble particles and powder as the main raw materials,respectively,industrial Y₂O₃ micropowder as the sintering aid,and water-soluble resin as the binder,vibration pressure forming,and firing at 1 800 ℃ for 6 h.The effect of the stabilizer types on the properties of high purity zirconia bubble refractories was studied.The results show that:(1)the main phase of the samples is cubic zirconia;the zirconia bubble particles and powder are well bonded;the sample with CaO stabilizer has relatively narrow and interconnected network pores,moderate mechanical properties and the best thermal shock resistance;the sample with Y₂O₃ stabilizer has uneven,dispersed and isolated pores,and the worst mechanical properties;the sample with CaO+Y₂O₃ stabilizer has smaller and more even pores,obvious densification trend,and the best mechanical properties,but the worst thermal shock resistance;(2)the linear expansion rate and thermal conductivity of the samples gradually increase with the temperature increasing;at high temperatures,the sample with CaO stabilizer has the lowest linear expansion rate and thermal conductivity;(3)overall,the sample with CaO stabilizer has the best performance.

Key words: stabilizer, zirconia bubbles, linear expansion rate, thermal conductivity, thermal shock resistance