晶粒生长对铁磷酸盐玻璃陶瓷固化体化学稳定性的影响

摘要

铁磷酸盐玻璃陶瓷可用于固化高放核废物。通过改变原料粉末尺寸和热处理的升温速率来控制成核的均匀性和晶核的生长速度，研究了在独居石玻璃陶瓷固化体中晶粒生长对固化体化学稳定性的影响。结果表明：粉末尺寸越小，越有利于形成均匀的晶核，固化体的化学稳定性越好，当粉末粒度小于38μm时浸出率达到最低值；热处理的升温速率越慢，所形成的微晶尺寸越均匀，固化体的化学稳定性越好，当升温速率为1℃／min时，样品的浸出率最低。%This paper presented the crystallization study of iron phosphate glass-ceramic which is a simpli- fied version of a new unclear host to be a potential candidate for the immobilization of highly concentrated radioactive wastes. The impact of changing the heating rate or the size of the glass powders during the ex- periment on the growth of the crystallization had been studied. It is observed that the slower the heating rate is, the more balanced the crystal is, and the smaller the size is, the more balanced the crystal is. The growth of the crystal is more balanced with slowing down the heating rate and decreasing the size of glass powders. The leaching rate of the samples is lowest when the size of the glass powders is less than 38μm in diameter and the heating rate is 1℃/min.