摘要
采用熔融法制备了不同P2O5含量的CaO-MgO-Al2O3-SiO2玻璃样品,研究了P2O5对该系微晶玻璃析晶的影响规律。结果表明:在所研究的CaO-MgO-Al2O3-SiO2玻璃中,P2O5的最大溶解量在10.0%质量分数左右,超过其饱和溶解度后将析出α-磷酸钙相。玻璃中添加4.0%质量分数P2O5时以表面析晶为主,析出晶体为钙长石和少量硅灰石。随着P2O5含量的提高,α-磷酸钙逐渐析出,同时钙长石和硅灰石的析出逐渐降低。进一步提高P2O5含量抑制了玻璃的表面析晶,促进了玻璃的分相和整体析晶。当P2O5的含量达到10%时,玻璃以整体析晶为主,在分相区内外区域析出晶体的形态非常相似,均呈现为细小粒状。
The base glasses in CaO-MgO-Al2O3-SiO2 melt-quenching method and the effect of P2O5 on the system with various P2O5 contents were prepared by crystallizing behavior was investigated. The results indicate that the maximum solid solution of P2O5 in the glass studied is around 10.0wt%, beyond which, crystalline phase of α-calcium phosphate [ α-Ca3 （PO4）2] will prec P2O5, as the surface-dominated crystallization is suggested and the crystallin major phase and wollastonite （CaSiO3 ） as a minor phase are contents, another crystal, α-calcium phosphate ipitate. In the sample with 4.0wt% e phases of anorthite （ CaAl2Si2O8 ） formed. With the increase of P2O5 , is also observed. And with the precipitation of the α- calcium phosphate phase, the diffraction peaks＇ intensity of anorthite and wollastonite phases decreased. Further increasing the content of P2O5 additive suppresses the surface crystallization and induces the phase-separation and the bulk crystallization. In the glass with 10. 0% PzO5 contents, the bulk crystallizations are predominated and the crystalline phases with particle shapes are observed. It is found that morphology of microstructures in the inner of phase-separated regions is similar to that of non-phaseseparated regions.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2008年第1期208-212,共5页
Journal of Synthetic Crystals
基金
山东省中青年科学家奖励基金资助项目(2006BSB1283)
