Lithium disilicate microcrystalline glass material prepared by using hybrid reaction sintering method and method

Abstract

The invention provides a lithium disilicate microcrystalline glass material prepared by using a hybrid reaction sintering method and the method. Raw materials for the material comprise lithium metasilicate crystal powder M, quartz sand glass powder S and lithium disilicate basic glass powder D, wherein a mol ratio of M to S to D is 1: 1-2: 0-8. The method comprises the following steps: subjecting lithium metasilicate glass and lithium disilicate basic glass to melting, water quenching and ball milling so as to prepare glass powder; subjecting lithium metasilicate glass powder to crystallization to obtain a crystal; adding the quartz sand glass powder and the lithium disilicate basic glass powder D; and uniformly mixing the above-mentioned three powders and carrying out sintering in a vacuum hot-pressing furnace so as to prepare lithium disilicate microcrystalline glass. The lithium disilicate microcrystalline glass produced by using the method has bending strength of 255 to 420 MPa and fracture toughness of 2.6 MPa.m1/2 to 3.5 MPa.m1/2. Compared with the prior art, the invention has the following advantages: production cost is reduced; desired pigments can be added into the mixed powder before sintering, which enables the problem of difficult color matching in a melting method to be overcome; a long rod-like crystal grain with length 5 times the size of a single glass powder sintered body is prepared; and a novel approach is opened up for toughening the lithium disilicate microcrystalline glass.

Description

technical field [0001] The invention belongs to the technical field of engineering ceramic preparation, and in particular relates to a lithium disilicate glass-ceramic material prepared by a mixed reaction sintering method and a method thereof. Background technique [0002] Lithium disilicate glass-ceramic is a series of precipitated lithium disilicate (Li 2 Si 2 o 5 ) is a general term for glass-ceramics with the main crystal phase. Its main component is Li 2 O and SiO 2 , in addition to adding P 2 o 5 , B 2 o 3 , ZrO 2 、K 2 O, Al 2 o 3 , CaO, CeO 2 , La 2 o 3 and other components to play the role of flux, nucleating agent and so on. In recent decades, researchers have conducted a lot of exploration and research on the composition design technology of basic glass, the nucleation and crystallization mechanism of glass-ceramics, the preparation technology of glass-ceramics and the relationship between composition-structure-performance, but fracture toughness, ...

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a lithium disilicate glass-ceramic material prepared by a mixed reaction sintering method and a method thereof, which reduces the production cost and allows the required pigment to be sintered before sintering. Adding it to the mixed powder solves the problems of color matching difficulties in the fusion method, and can prepare long rod-shaped grains up to 5 times the size of a single glass powder sintered, opening up a new way for toughening lithium disilicate glass-ceramics

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