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Spinel transparent microcrystalline glass with low melting temperature, preparation method and performance enhancing method thereof

A technology of glass-ceramics and spinel, applied in the field of spinel transparent glass-ceramics and its preparation and performance enhancement, can solve the problem of high melting temperature, difficulty in ensuring glass clarification and uniformity, magnesium-aluminum-silicon glass Problems such as high temperature viscosity

Active Publication Date: 2020-04-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high aluminum and silicon content, the high-temperature viscosity of magnesium-aluminum-silicon glass is high, and the melting temperature is high, so it is difficult to ensure the clarity and uniformity of the glass.

Method used

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  • Spinel transparent microcrystalline glass with low melting temperature, preparation method and performance enhancing method thereof
  • Spinel transparent microcrystalline glass with low melting temperature, preparation method and performance enhancing method thereof
  • Spinel transparent microcrystalline glass with low melting temperature, preparation method and performance enhancing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh the raw materials: the glass batch is composed according to the mole percentage of oxides:

[0037]

[0038] Mix the batch materials evenly, heat them at 1580°C for 2 hours to melt them, cast them after clarification, anneal them at 600°C for 3 hours to obtain glass blocks, and then carry out nucleation and crystallization treatments. The specific parameters are: heat up to 750°C at room temperature ℃ for 5 hours, continue to heat up to 800 ℃ for 3 hours, the heating rate is 5 ℃ / min, after microcrystallization treatment, cool naturally with the furnace to obtain glass ceramics, as figure 1 ;

[0039] After testing, the main crystal phase of glass-ceramics is magnesium aluminum spinel (MgAl 2 o 4 ) and zinc-aluminum spinel (ZnAl 2 o 4 ),Such as Figure 5 . Sample Vickers hardness (H v ) is 748kgf / mm 2 .

Embodiment 2

[0041] Weigh the raw materials: the glass batch is composed according to the mole percentage of oxides:

[0042]

[0043] Mix the batch materials evenly, heat them at 1550°C for 3 hours to melt them, cast them after clarification, anneal them at 580°C and heat them for 4 hours to obtain glass blocks, and then carry out nucleation and crystallization treatments. The specific parameters are: heat up to 650 ℃ for 5 hours, continue to heat up to 850 ℃ for 3 hours, the heating rate is 5 ℃ / min, after the microcrystallization treatment, cool naturally with the furnace to obtain glass ceramics, as figure 2 ;

[0044] After testing, the main crystal phase of glass-ceramics is magnesium aluminum spinel (MgAl 2 o 4 ) and zinc aluminum spinel (ZnAl 2 o 4 ),Such as Figure 6 . Sample Vickers hardness (H v ) is 735kgf / mm 2 .

Embodiment 3

[0046] Weigh the raw materials: the glass batch is composed according to the mole percentage of oxides:

[0047]

[0048] Mix the batch materials evenly, heat them at 1580°C for 3 hours to melt them, cast them after clarification, and anneal them at 550°C for 3 hours to obtain glass blocks, and then carry out nucleation and crystallization treatments. The specific parameters are: heat up to 750°C at room temperature ℃ for 5 hours, continue to heat up to 870 ℃ for 3 hours, the heating rate is 5 ℃ / min, after the microcrystallization treatment, cool naturally with the furnace to obtain glass ceramics, such as image 3 ;

[0049] After testing, the main crystal phase of glass-ceramics is magnesium aluminum spinel (MgAl 2 o 4 ) and zinc-aluminum spinel (ZnAl 2 o 4 ),Such as Figure 7 ;

[0050] The glass particles are obtained by water quenching method, and the viscosity-temperature curve is measured by a rotational viscometer, as shown in Figure 9 , when the viscosity i...

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Abstract

The invention belongs to the field of inorganic materials, and relates to spinel transparent microcrystalline glass with a low melting temperature, a preparation method and a performance enhancing method thereof. The oxide component of the microcrystalline glass comprises: 48-55 mol% of SiO2, 14-17 mol% of Al2O3, 2-12 mol% of Na2O, 8-16 mol% of MgO, 2-12 mol% of ZnO, 0.5-4.5 mol% of TiO2, 0.1-3 mol% of ZrO2, and 0.5-1 mol% of Sb2O3. According to the invention, the spinel transparent microcrystalline glass is obtained through glass component design and heat treatment process control, has the melting temperature of less than 1500 DEG C and the transmittance of more than 80% in a visible light region, has the main crystal phases of magnesia-alumina spinel (MgAl2O4) and zinc-alumina spinel (ZnAl2O4), and has the Vickers hardness (Hv) of 800 kgf / mm<2>, wherein the Vickers hardness (Hv) can be improved by more than 15% after ion exchange with a KNO3 molten salt.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and relates to a spinel transparent glass-ceramic with relatively low melting temperature and its preparation and performance enhancing method. Background technique [0002] Glass-ceramics is a glass with a specific composition doped with a crystal nucleating agent or not doped with a crystal nucleating agent, and heat-treated under controllable conditions, so that the original single and uniform glass phase becomes a microcrystalline phase and a glass phase. Evenly distributed composite material. In general, glass-ceramics are heat-treated to obtain glass-ceramics, which are generally opaque due to light scattering at the interfaces between adjacent crystals and between the crystals and the residual glass phase. To make glass-ceramics transparent, the following two conditions need to be met: 1) The size of the precipitated crystals should be as small as possible, which should be smaller than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02
CPCC03C10/0036
Inventor 王静向维韩建军余炜
Owner WUHAN UNIV OF TECH
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