Preliminary study on combining K₂O-Al₂O₃-SiO₂ system dental glass ceramic with Al₂O₃ ceramic

Abstract

Relationship between K₂O-Al₂O₃-SiO₂ system dental glass ceramics and Al₂O₃ ceramics was investigated. 4 groups of glass ceramic with the same components but different thickness (0.8, 1.2, 1.6, and 2.0 mm) were sintered on Al₂O₃ base ceramics according to the same thermal treatment system of leucite micro-crystallization reported in previous literatures. The products of each group were analyzed by polarizing microscope, X-ray diffractometer, and an INSTRON material testing machine. Under the thermal treatment system, leucite crystals were formed in samples of each group, and dispersed evenly. Meanwhile, the compressive strengths of group 3 and group 4 were higher than those of group 1 and group 2. Samples of group 3 showed better mechanical properties than others. The conclusions are drawn that Leucite crystals can be controlled in K₂O-Al₂O₃-SiO₂ system glass ceramic-Al₂O₃ ceramic composite material, and the thickness of glass ceramic has a notable influence on the compressive strength of this ceramic composite material.

Keywords

glass ceramics / Al₂O₃ ceramics / composite ceramic material / compressive strength

References

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