Lithium disilicate glass-ceramics composite material using ZrO2 as reinforcing phase and method for making same

Abstract

The present invention relates to a lithium disilicate glass-ceramic composite material with ZrO₂ as the reinforcing phase and thepreparation method, which solve the problems that the production cycle is long, the cost is high, the products can be easily formed and the mechanical properties of the lithium disilicate glass-ceramic is lower. The present invention is composed of the lithium disilicate base glass and zirconia powders. The preparation method goes in that the ball milling is carried out according to the components of the original glass; the desiccated raw materials are placed in a corundum crucible so as to be melted under high temperature; the glass solution is poured into the distilled water to go into water quenching so as to be changed into 1 to 2mm glass particles; the ball milling is applied to the glass particles after going into the water quenching so as to obtain the glass powders; the lithium disilicate glass powder is taken to be mixed with the zirconia powders and the ball milling is applied to the lithium disilicate glass powder and the zirconia powders with the alcohol as the medium; the vacuum heating-press sintering is implemented and then the lithium disilicate glass-ceramic composite material with ZrO₂ as the reinforcing phase is prepared. The present invention is uneasily deformed, has short production cycle and low cost and has excellent bending strength and fracture toughness indexes.

Description

technical field [0001] The invention relates to a glass-ceramic composite material and a preparation 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. Because the system glass-ceramics has the advantages of low melting point and adjustable coefficient of thermal expansion, it is widely used in the fields of electronic packaging and biomedicine. In 1998, Ivoclar and the University of Zurich jointly researched and developed lithium disilicate dental glass-ceramic materials by using a hot-press casting process. It has perfect natural luster, good mechanical properties and chemical corrosion resistance, and can meet the application requirements of dental crowns and connecting bridges. However, it still cannot meet the requirements for the use of root materials that require higher mechanical properties. The use of zir...

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Problems solved by technology

[0003] In order to solve the existing melting method, the present invention directly adds zirconia into the glass ingredients, which will increase the difficulty of melting; while the increase of viscosity in the sintering method will hinder the sintering of glass and zirconia, resulting in a decrease in the density of the material; -The production cycle of the gel method is long, the cost is high...