Milky white glass ceramic suitable for all electric melting and preparation process for milky white glass ceramic

Abstract

The invention provides a milky white glass ceramic material and a preparation process thereof. The milky white glass ceramic material contains the following components: 67 to 74 percent of SiO2, 8.0 to 12 percent of Na2O, 0.3 to 2.5 percent of K2O, 6 to 9 percent of Al2O3, 3 to 5 percent of B2O3, 0.3 to 2 percent of CaO, 0.3 to 2 percent of ZnO, 0.5 to 2.5 percent of BaO, 0.3 to 2 percent of MgO, 2.5 to 4.8 percent of F and 0.5 to 2 percent of Li2O. The material is prepared by the following steps of: (1) weighing the following raw materials in part by weight: 4 to 9 parts of alumina powder, 0.5 to 3 parts of barium carbonate, 0.15 to 3.5 parts of calcium carbonate, 0.5 to 3 parts of fluorite, 0.5 to 4 parts of dolomite, 0.5 to 5 parts of potassium nitrate, 0.3 to 2 parts of magnesium oxide, 5 to 11 parts of borax pentahydrate, 5 to 10 parts of soda ash, 3.5 to 9 parts of sodium fluosilicate, 7 to 20 parts of albite, 1 to 5 parts of sodium nitrate, 50 to 70 parts of quartz sand, 0.25 to 2 parts of zinc oxide and 1 to 5 parts of lithium carbonate, and mixing the raw materials to obtain a batch; (2) putting the batch into an electric melting furnace, and performing all electric melting at the temperature of between 1,320 and 1,520 DEG C to obtain molten glass; (3) adjusting the temperature of the molten glass, and molding in a mould by a pressing or centrifugal method; (4) putting a molded product into an annealing kiln, and annealing at the temperature of between 530 and 620 DEG C for more than 60 minutes; and (5) performing toughening treatment after annealing.

Description

technical field

[0001] The invention relates to the field of glass processing, in particular to a milky white glass ceramic material and a preparation process thereof. Background technique

[0002] Glass-ceramics (glass-ceramics; pyzoceram; microcrystalline glass), also known as glass-ceramic, is a kind of composite material combined with crystal phase and glass made through high-temperature melting, molding, and heat treatment.

[0003] The milky white glass ceramic material uses fluorite, sodium fluorosilicate, etc. as the opacifying agent. The opacifying agent is completely dissolved under high temperature conditions, and NaF and CaF crystal grains are precipitated during cooling. The refractive index of NaF and CaF crystal grains is different from that of the matrix glass. Scattering of light. The grain size of NaF and CaF is different, and different particles produce a kind of white scattering due to the overlapping of scattered light, which makes the glass ceramic pro...

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