Abstract
To study the effect of B2O3 and P2O5 on fluorosilicic mica glass-ceramic sintering process, six sets of K2O-MgO-SiO2-F glasses were prepared by using B2O3 and P2O5 as sintering aid, respectively. Green bodies of the glass powder were formed by gel casting and sintered at 800, 850, 900, 950, 1000oC for 6 hours, resectively. The sintering and crystallization behavior were studied by thermal shrinkage , X-ray diffraction and SEM. The results showed that the shrinkage rate of the glass with 2wt% B2O3 and P2O5 was highest, while the rate of the glass with 5wt% P2O5 was lowest. An additional crystal other than fluorosilicic mica was precipitated in the glass ceramics generated by sintering of glass powder. The present results confirmed that the glass powder of pure K2O-MgO-SiO2-Fsystem had poor sinterability, while glass powder with minor addition of P2O5 and/or B2O3 showed good sinterability. This result was also verified by SEM.
Highlights
Fluoromica glass ceramics are widely used in the dental field because of their high esthetics, good mechanical properties and excellent machinability [1,2,3,4]
The second one is the “sintering method”, [9,10] i.e. the glass articles are fabricated from pulverized glass powders by conventional ceramic-shaping techniques and sintered to form glass ceramics
Vita is the most notable dental glass ceramics fabricated by sintering. It seems that the effect of various additives on the above-mentioned characteristics of sintered mica glass–ceramics has been discussed in only several papers [11,12]
Summary
Fluoromica glass ceramics are widely used in the dental field because of their high esthetics, good mechanical properties and excellent machinability [1,2,3,4]. The second one is the “sintering method”, [9,10] i.e. the glass articles are fabricated from pulverized glass powders by conventional ceramic-shaping techniques and sintered to form glass ceramics. Vita is the most notable dental glass ceramics fabricated by sintering. It seems that the effect of various additives on the above-mentioned characteristics of sintered mica glass–ceramics has been discussed in only several papers [11,12]. Efforts had been made on the understanding of the effect of B2O3 and P2O5 on the sintering of fluorosilicic mica glass ceramics. The green bodies of glass powders are fabricated by gel-casting. The densities of the dried powder compacts are around 60% of theoretical ones
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