根据硬盘基板用材料的要求,制备了MgO-Al2O3-SiO2-TiO2-Y2O3 高弹性模量玻璃(１２０ＧＰａ)玻璃的弹性模量随组成的变化服从Ｍａｋｉｓｈｉｍａ－Ｍａｃｋｅｎｚｉｅ理论,ＭｇＯ、Ａｌ２Ｏ３、ＴｉＯ２、Ｙ２Ｏ３等具有较高单位体积离解能的氧化物有利于提高玻璃的弹性模量．但玻璃弹性模量的理论计算值低于测试值．这是因为Ｍａｋｉｓｈｉｍａ－Ｍａｃｋｅｎｚｉｅ理论没有考虑玻璃内阳离子的具体配位状态,对ＭｇＯ、Ｙ２Ｏ３堆积密度因子的推导存在误差．因此利用Ｍａｋｉｓｈｉｍａ－Ｍａｃｋｅｎｚｉｅ理论发展高弹性模量玻璃时应对ＭｇＯ、Ｙ２Ｏ３等氧化物的计算进行修正．
MgO-Al2O3-SiO2-TiO2-Y2O3 glasses with high elastic moduli were prepared for the substrates of hard disks. The elastic moduli of glasses
change with their compositions according to Makishima-Mackenzie theory. The oxides with big dissociation energies per unit volume, such as MgO, Al2O3, TiO2
and Y2O3, are beneficial to the elastic moduli of glasses. The elastic moduli calculated by means of Makishima-Mackenzie theory, however, are lower than the
measured data, the deviation can be attributed to the pretermission of the coordination structures of cation ions in glasses, and the packing volume factors of MgO and
Y2O3 are not accurately dealt with, so the calculated elastic moduli of the glasses containing MgO and Y2O3 should be corrected.
参考文献
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