The effect of TiO2 on the crystallization behaviors of the glass ceramics prepared from granite tailings was investigated by differential scanning calorimetry （DSC）, X-ray diffraction （XRD）, and field emission sca...The effect of TiO2 on the crystallization behaviors of the glass ceramics prepared from granite tailings was investigated by differential scanning calorimetry （DSC）, X-ray diffraction （XRD）, and field emission scanning electron microscopy （FESEM）. The results showed that the crystallization peak temperature decreased firstly, and then increased with the increase of TiO2 content. The optimum addition amount of TiO2 was 8 wt%. With a single-step heat treatment at 924 ℃ for I h, augite precipitated as the only crystalline phase both on the surface and in the interior. The avrami parameter of the sample was 3.25, suggesting a two- dimensional crystallization mechanism. The activation energies for phase separation and crystallization of augite were 321.75 and 698.83 kJ/mol, respectively.展开更多
Cambodian Prime Minister Hun Sen’s visit to China in early February showcased the special“ironclad”friendship between China and Cambodia Cambodian Prime Minister Hun Sen made an official visit to China from Februar...Cambodian Prime Minister Hun Sen’s visit to China in early February showcased the special“ironclad”friendship between China and Cambodia Cambodian Prime Minister Hun Sen made an official visit to China from February 9 to 11.The visit was significant in that it took place at the beginning of the year marking the 65th anniversary of the establishment of China-Cambodia diplomatic relations and the“Year of China-Cambodia Friendship.”展开更多
基金Funded by the National Key Technology Support Program of China(No.2012BAA10B03)Hubei Provincial Science and Technology Department,China(No.2012BAA1001)
文摘The effect of TiO2 on the crystallization behaviors of the glass ceramics prepared from granite tailings was investigated by differential scanning calorimetry （DSC）, X-ray diffraction （XRD）, and field emission scanning electron microscopy （FESEM）. The results showed that the crystallization peak temperature decreased firstly, and then increased with the increase of TiO2 content. The optimum addition amount of TiO2 was 8 wt%. With a single-step heat treatment at 924 ℃ for I h, augite precipitated as the only crystalline phase both on the surface and in the interior. The avrami parameter of the sample was 3.25, suggesting a two- dimensional crystallization mechanism. The activation energies for phase separation and crystallization of augite were 321.75 and 698.83 kJ/mol, respectively.
文摘Cambodian Prime Minister Hun Sen’s visit to China in early February showcased the special“ironclad”friendship between China and Cambodia Cambodian Prime Minister Hun Sen made an official visit to China from February 9 to 11.The visit was significant in that it took place at the beginning of the year marking the 65th anniversary of the establishment of China-Cambodia diplomatic relations and the“Year of China-Cambodia Friendship.”
