Synthetic beta-spodumene solid solution, microcrystalline glass prepared from synthetic beta-spodumene solid solution and preparation method of microcrystalline glass

Abstract

The invention belongs to the technical field of inorganic materials, and relates to a synthetic beta-spodumene solid solution, microcrystalline glass prepared from the synthetic beta-spodumene solid solution and a preparation method of the microcrystalline glass In the synthetic beta-spodumene solid solution, according to the theoretical mass ratio of Li2O to Al2O3 to nSiO2 in the chemical formulaLi2OAl2O3nSiO2 of the beta-spodumene solid solution, n is larger than 4 and smaller than or equal to 8, corresponding raw materials containing Li2O, Al2O3 and SiO2 are prepared according to the ratiorequired by synthesis and sintered at the sintering temperature, and the synthesized Li2OAl2O3nSiO2 is obtained, wherein the part of SiO2 of which n is greater than 4 is excessive free SiO2 absorbedin beta spodumene crystal lattices or added SiO2 to form the beta-spodumene solid solution. The microcrystalline glass is prepared from the synthesized beta spodumene solid solution and matrix glass.The microcrystalline glass comprises the following chemical components in percentage by weight: 68%-78% of SiO2, 14.0%-22.0% of Al2O3, 2%-5.5% of Li2O, 0.3%-1.8% of MgO, 1%-3% of ZnO, 1%-3% of B2O3, 0%-3% of BaO, 0.2%-0.4% of ZrO2, 0-1.5% of TiO2, 0%-0.3% of K2O and 0%-0.3% of Na2O.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and relates to a synthetic β-spodumene solid solution, a glass-ceramic made from the synthetic β-spodumene solid solution and a manufacturing method thereof. Background technique [0002] Spodumene is a mineral raw material whose chemical formula is Li 2 O·Al 2 o 3 4SiO2 2 , chemical composition LiAl[Si 2 o 6 ], where Li 2 The theoretical content of O is as high as 8.03%. Spodumene concentrate generally contains Li 2 O is 6.3 to 7.5%. In fact, the content usually ranges from 2.91 to 7.66%, which may be the natural spodumene minerals always contain Na + , Mg 2+ 、K + , Ca 2+ , Fe 2+ 、Cr 3+ , Mn 2+ Wait for a small amount of ions, due to the replacement of lithium by sodium and potassium. When spodumene is roasted to about 1000 °C, it rapidly transforms into β-type spodumene, and its lattice structure can absorb free SiO 2 and additional SiO 2 , forming a solid solution...

AI Technical Summary

Problems solved by technology

Therefore, due to the higher amount of Na in the natural spodumene mineral + 、K + Oxide, excess sodium, potassium replacement lithium reduces Li 2 The content of O changes the lattice structure of β-spodumene generated at the transition temperature, and absorbs free SiO 2 and additional SiO 2 The ability to form β-spodumene solid solution decreases, and the excess K 2 O, Na 2 The additive effect of the high thermal expansion coefficient of O makes the excess Na + 、K + Impurity of natural spodumene reduces the effect of lowering the thermal expansion coefficient

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