【摘要】 目的 :探讨预烧结温度及升温速率对氧化铝玻璃复合体的物理及力学性能的影响 .方法 :采用高速率升温至14 0 0℃、14 5 0℃ ,低速率升温至 14 0 0℃、14 5 0℃ 4种方法烧结制备氧化铝玻璃复合体 ,对比测定AGC的密度、热膨胀系数、三点弯曲强度、断裂韧性、弹性模量和维氏硬度 .结果 :随着预烧结温度和升温速率的升高 ,其密度略有降低 ,三点弯曲强度、断裂韧性及弹性模量明显增加 ,高速率升温至 14 5 0℃与低速率升温至 14 5 0℃制备的AGC的三点弯曲强度及断裂韧性无显著差异 .低速率升温至 14 0 0℃制备的AGC的三点弯曲强度显著低于其他三组的三点弯曲强度 .在 14 5 0℃升温组中的维氏硬度高于 14 0 0℃升温组的维氏硬度 .结论 :多孔氧化铝的预烧结温度、升温速率均会对AGC的各项性能造成很大影响 ,但预烧结温度对AGC的各项性能起主要作用更多还原

【Abstract】 AIM: To study the effects of presintering temperature and the temperature elevation speed on the physical and mechanical properties of alumina glass composites (AGC). METHODS: The alumina glass composite was prepared respectively at 1400℃ and 1450℃ by fast or slow temperature elevation speed. The properties were measured, including density, thermal expansion coefficient, three point bending strength, fracture toughness, modulus of elasticity and Vickers hardness of AGC. RESULTS: With the increasing of presintering temperature and the temperature elevation speed, the density of AGC decreased while the bending strength, fracture toughness and modulus of elasticity increased markedly. There was no significant difference between the three point bending strength and fracture toughness of AGC at 1450℃ by fast or slow temperature elevation speed, while the three point bending strength and fracture toughness of AGC at 1400℃ by slow temperature elevation speed were significant lower than those in the other three groups. The bending strength of AGC at 1400℃ by slower temperature elevation speed was the lowest. The Vickers hardness of the 1450℃ groups was higher than that of the 1400℃ groups. CONCLUSION: Both presintering temperature and the temperature elevation speed influence the properties of AGC. Of the two, the presintering temperature has the greater effect.更多还原