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为了探讨球磨作用对纳米A l2O3颗粒相变温度的影响,利用高能振动球磨机分别对纳米A l2O3进行不同时间的球磨,并将球磨作用后的A l2O3粉末在不同温度下进行退火处理。采用XRD、TEM、FT-IR及DTA等方法测定处理前后A l2O3粉末的结构、物相组成及相变温度。结果表明:随着球磨时间的增长,A l2O3的相变温度降低,当球磨时间达50 h时,-γA l2O3到θ-A l2O3相变以及-θA l2O3到-αA l2O3相变的温度均降低了100℃左右;球磨作用促进了A l2O3的晶化,同时可以造成纳米氧化铝的晶格缺陷,是导致相变温度降低的主要原因。
In order to investigate the effect of ball milling on the phase transition temperature of nano-Al2O3 particles, ball milling was performed on the nano-Al2O3 at different times by high-energy vibrating ball mill, and the A1203 powder after ball milling was annealed at different temperatures. The structure, phase composition and phase transition temperature of A l2O3 powder before and after treatment were determined by XRD, TEM, FT-IR and DTA. The results show that the phase transition temperature of A l2O3 decreases with the milling time increasing. When the ball milling time reaches 50 h, the temperatures of -γA l2O3 to θ-A l2O3 transformation and -θA l2O3 to -αAl2O3 phase transformation decrease About 100 ℃; ball milling promoted the crystallization of A l2O3, at the same time can cause lattice defects of nano-alumina, is the main reason leading to the phase transition temperature decreases.