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Lithium metasilicate glass ceramic and preparation method thereof

A technology of glass ceramics and lithium metasilicate, which is applied in the field of ceramics, can solve the problems of narrow crystallization temperature range, cumbersome production process, and long processing time, and achieve the effects of low production equipment requirements, simple production process, and shortened processing time

Active Publication Date: 2017-01-04
SHENZHEN UPCERA DENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the need for two heat treatments, the production process is relatively cumbersome, and the crystallization temperature range of lithium metasilicate is narrow and sensitive to the crystallization temperature, so the requirements for production equipment are relatively high
[0007] (2) The crystal form of lithium metasilicate obtained after the crystallization heat treatment is carried out by adopting the prior art of two-step heat treatment process is as follows figure 1 As shown, the crystal form is plate-like or flake-like. Due to the high degree of crystallization of the glass-ceramic product prepared by the two-step heat treatment process, the hardness of the lithium metasilicate glass-ceramic is relatively high, about 6000MPa. Such a lithium metasilicate Although glass ceramics are easier to process and form than lithium disilicate glass ceramics, due to their relatively high hardness, the wear of cutting burs or grinding tools is more severe during processing, which also makes the overall processing time longer
[0008] (3) The obtained lithium metasilicate glass-ceramic has poor transparency, and it is not easy to observe the defects existing in it, such as bubbles, hidden cracks, etc., which is not conducive to the quality inspection of the product

Method used

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  • Lithium metasilicate glass ceramic and preparation method thereof
  • Lithium metasilicate glass ceramic and preparation method thereof
  • Lithium metasilicate glass ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (a) According to each component in Example 1 in Table 1, it is converted into the weight of corresponding raw material. Then take by weighing the corresponding raw materials of each component, grind for 3 hours through a ball mill, pass through a 100-mesh sieve after mixing evenly, and make a batch;

[0052] Put the batch material into a corundum crucible, heat it to 1500 °C in a sintering furnace at a heating rate of 13 °C / min, and keep it warm for 1 hour to completely melt the batch material, remove the gas and clarify and homogenize to obtain a matrix glass liquid.

[0053] (b) Pour the matrix glass liquid into a metal mold at 300° C., and cool to room temperature to obtain a matrix glass body.

[0054] (c) Place the matrix glass body in a resistance furnace for heat treatment. The process parameters for heat treatment include: heating up to 480° C. at a heating rate of 5° C. / min and holding the temperature for 150 minutes. After the heat treatment, cool down to roo...

Embodiment 2

[0056] Each component of matrix glass liquid is with reference to embodiment 2 in table 1, and the difference of its preparation method and embodiment 1 is:

[0057] After the matrix glass liquid is prepared in step (a), the matrix glass liquid is directly poured into cold water for water quenching to obtain fine matrix glass fragments, and then the matrix glass fragments are dried at a temperature of 150°C In 2 hours, the dried matrix glass fragments were melted at a temperature of 1500°C to form a matrix glass liquid; then the matrix glass liquid was poured into a metal mold at 350°C, and cooled to room temperature to obtain a matrix glass body.

[0058] The process parameters of the heat treatment include: heating up to 560° C. at a heating rate of 8° C. / minute, and keeping the temperature for 120 minutes.

[0059] The prepared lithium metasilicate glass-ceramic is carried out scanning electron microscope test and XRD (X-ray diffraction) test, wherein,

[0060] The scannin...

Embodiment 3

[0077] Each component of matrix glass liquid is with reference to embodiment 3 in table 1, and the difference of its preparation method and embodiment 2 is:

[0078] The technical parameters of the heat treatment include: heating up to 520° C. at a heating rate of 5° C. / min, and keeping the temperature for 90 minutes.

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Abstract

The embodiment of the invention discloses a preparation method of lithium metasilicate glass ceramic, comprising the following steps: (a) preparing matrix molten glass; (b) pouring the matrix molten glass into a mould, and cooling to obtain a matrix glass body; and (c) placing the matrix glass body into a heating device, and carrying out heat treatment. According to the heat treatment, temperature rises at the heating rate of 5-20 DEG C / min to 450-600 DEG C, and thermal insulation is carried out for 20-150 min. After the heat treatment, furnace cooling is conducted to obtain the lithium metasilicate glass ceramic. In comparison with the prior art, the technical scheme has the following advantages: in the obtained lithium metasilicate glass ceramic, crystal morphology of the main crystalline phase lithium metasilicate is nanoscale and the crystal morphology is uniform spheres. Crystallization degree is low. Thus, hardness of lithium metasilicate glass ceramic is reduced. Abrasion to cutting needles or grinding tools can be reduced during the machining process, and the whole processing time is shortened.

Description

technical field [0001] The invention relates to the field of ceramics, in particular to a lithium metasilicate glass ceramic and a preparation method thereof. Background technique [0002] Lithium disilicate glass ceramics are widely used in the field of dental restoration due to their good mechanical properties and outstanding aesthetic effects. [0003] However, the strength of lithium disilicate glass ceramics is generally above 350 MPa, and it is not easy to form and process. In order to solve the problem of forming and processing, the prior art generally uses matrix glass to generate lithium metasilicate glass ceramics, then performs forming processing on lithium metasilicate glass ceramics, and finally heat-treats the formed lithium metasilicate glass ceramics, A lithium disilicate glass ceramic is obtained. Since the strength of lithium metasilicate glass-ceramic is lower than that of lithium disilicate glass-ceramic, molding and processing are relatively easy. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04
CPCC03B32/02C03C3/097C03C10/0027C03C10/0054
Inventor 郑艳春宋国轶王鸿娟
Owner SHENZHEN UPCERA DENTAL TECH
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