Rare earth-mixing high strength lithium bisilicate sitall material and preparation method thereof

Abstract

The invention relates to a rare earth-mixing high strength lithium bisilicate sitall material and a preparation method thereof. Parent glass of the invention includes the following components according to molar percentage: 61.2 to 66.0 percent of SiO2, 0 to 2.5 percent of B2O3, 0 to 1.6 percent of Al2O3, 1.0 to 3.7 percent of P2O5, 0 to 2.3 percent of ZrO2, 1.0 to 1.8 percent of K2O, 24.2 to 31.8 percent of Li2O, 0 to 2.0 percent of MgO, 0 to 2.0 percent of CaO, and 0.5 to 4.2 percent of La2O3+Y2O3. A corresponding raw material prepared from the oxidates is processed by the steps of ball milling, 80 mesh sieve sieving and uniform mixing to obtain a batch; the batch is led into a copple to be melted after the temperature from 1480 to 1520 DEG C is maintained for 2 to 3 hours, and the melted batch is cast into a stainless steel mould to be molded and then is annealed at 500 DEG C for 0.5 hour; and the step of coring is carried out in a resistance furnace at the temperature from 500 to 550 DEG C for 1 hour, and the step of crystallization is carried out at the temperature from 600 to 850 DEG C for 2 hours. The crystallization degree of the sitall is as high as 60 to 70 percent, the flexural strength is 100 MPa or more higher than the sitall to which the rare earth oxides are not added, the highest flexural strength reaches 334 MPa, the maximum elastic modulus reaches 143 GPa, and the highest fracture toughness reaches 3.34 MPa-m. The sitall of the invention has favorable stability, and the heat treatment temperature is lower and is easy to control.

Description

Technical field [0001] The present invention relates to glass-ceramic materials and preparation methods thereof, in particular to rare earth-doped high-strength lithium disilicate glass-ceramics and preparation methods thereof. Background technique [0002] Since its successful development, crystallized glass has been widely used in biomedicine, machinery, electronics, aerospace engineering and other fields. In the past few decades, researchers have conducted extensive 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 composition-structure-property relationship. Compared with traditional glass, crystallized glass has excellent thermal, mechanical and electrical properties, such as low thermal expansion coefficient, high compressive strength, high flexural strength, high elastic modulus, high fracture toughness, etc. However, the f...

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Problems solved by technology

Although the glass-ceramic materials obtained by this method have high strength and fracture toughness, the preparation process is complicated, the equipment conditions are high, and it is difficult to obtain translucent materials.

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