Sintering-Crystallization Behavior and Properties of Low Expansion Lithium Aluminosiliate Glass-Ceramics
Low expansion Li2O-Al2O3-SiO2(LAS)glass-ceramics were prepared using sintering method.The effect of ZnO partially substitution for Li2O on the microstructure,sintering behavior,crystallization behavior and properties of LAS glass-ceramics was investigated.The results show that the substitution of ZnO for Li2O reduces the initial crystallization temperature of LAS glass-ceramics,leading to significant amount of Li2Al2Si3O10 phase precipitating out after holding at 800 ℃ for 10 min,which hinders the sintering shrinkage of glass.In contrast,the LAS glass-ceramics without ZnO exhibits slower crystallization at 800℃,which is beneficial for sintering densification process.When the sintering temperature is 1 100℃,the main crystalline phase present in glass-ceramics is identified as β-spodumene.The coefficient of thermal expansion of glass-ceramics without ZnO is 1.747 x 10-6 K-1,the flexural strength is 138.4 MPa,the dielectric constant is 3.52 and the dielectric loss is 0.001 6.
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