Preparation method of surface devitrified glass-ceramics

A glass-ceramic and crystallization technology, which is applied in the field of surface crystallization glass-ceramic preparation, can solve the problems of low efficiency and achieve the effect of simple process, good effect and clear steps

Active Publication Date: 2018-09-07
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned surface crystallization methods all need to introduce a crystallizer into the glass to achieve surface crystallization, and the efficiency is low.

Method used

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  • Preparation method of surface devitrified glass-ceramics

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preparation example Construction

[0028] The invention provides a method for preparing surface devitrified glass-ceramics, which comprises:

[0029] Step 1. Provide raw materials, which include zinc oxide, boron oxide and silicon dioxide with a molar ratio of (25-60):(5-50):(5-30); grind and mix the raw materials;

[0030] Step 2, heating and melting the raw materials obtained in step 1 to obtain molten glass;

[0031] Step 3, forming and annealing the molten glass obtained in step 2 to obtain an intermediate product;

[0032] Step 4, heat-treating the intermediate product obtained in Step 3 to obtain surface devitrification glass-ceramics.

[0033] Among the above raw materials, the molar ratio of zinc oxide, boron oxide and silicon dioxide is preferably (30-60):(25-40):(5-20), more preferably 60:30:10. As a preferred version of the present invention, the raw material also includes aluminum oxide and / or sodium oxide; the molar ratio of aluminum oxide to zinc oxide is (0-4): (25-60); the molar ratio of sodiu...

Embodiment 1

[0044] The glass raw material composition is 60% ZnO, 30% B 2 o 3 , 10% SiO2 2 , Weigh 120g of glass raw materials, mix the raw materials evenly and place them in a platinum-rhodium alloy crucible, put them in a high-temperature furnace at 1400°C for 2 hours, then pour the melt into a preheated graphite mold for molding, and quickly send it into In the annealing furnace, keep warm at 550°C for 2 hours, and then cool to room temperature with the furnace. Then cut the glass into glass pieces of 5*5*20mm and put them at 650° C. for 5 hours to obtain surface crystallized glass-ceramics. The thickness of the devitrified layer measured by scanning electron microscope is about 53 μm. Grind the heat-treated surface crystallization glass into powder, and the phase measured by XRD is Zn 3 (BO 3 ) 2 ,Such as figure 2 Shown in Example 1.

Embodiment 2

[0046] The glass raw material composition is 60% ZnO, 30% B 2 o 3 , 10% SiO2 2 , Weigh 120g of glass raw materials, mix the raw materials evenly and place them in a platinum-rhodium alloy crucible, put them in a high-temperature furnace at 1400°C for 2 hours, then pour the melt into a preheated graphite mold for molding, and quickly send it into In the annealing furnace, keep warm at 550°C for 2 hours, and then cool to room temperature with the furnace for later use. Then cut the glass into 5*5*20mm glass block, put it in 585℃ for 2h, then raise it to 650℃ at 5℃ / min and keep it for 5h to get crystallized glass. The thickness of crystallized layer measured by scanning electron microscope is approx. 65 μm. Grind the heat-treated surface crystallization glass into powder, and the phase measured by XRD is Zn 3 (BO 3 ) 2 ,Such as figure 2 Shown in Example 2.

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Abstract

The invention relates to the technical field of glass, in particular to a method for preparing surface crystallization glass ceramics. The method comprises the steps of 1, providing raw materials and grinding and evenly mixing the raw materials, wherein the raw materials are zinc oxide, boron oxide and silicon dioxide which are mixed based on the molar ratio of (25-60):(5-50):(5-30); 2, heating and melting the product generated in step 1 to obtain glass metal; 3, conducting molding and annealing on the glass metal generated in step 2 to obtain an intermediate product; 4, conducting heat treatment on the intermediate product generated in step 3 to obtain the surface crystallization glass ceramics. According to the method, no crystallization agent is required, processes are simple, steps are clear, cost is low, and surface crystallization effect is good.

Description

technical field [0001] The invention relates to the technical field of glass, in particular to a method for preparing surface crystallized glass-ceramics. Background technique [0002] The strength of general glass is not very high, about 50MPa, but the theoretical strength value is about 9810-29420MPa. The reason is that there are countless small cracks on the surface of the glass that cannot be seen with an optical microscope, which are called Griffith cracks. These cracks are semi-elliptical and act as stress centers. When the glass is loaded, the fracture process starts from the cracks first, earlier than that of glass without defects. This is why there is a large difference between the actual strength of the glass surface and the theoretical strength. Defects on the glass surface are far more fragile than the inside of the glass, so if you want to greatly improve the strength of the glass, you must first take measures on the glass surface. Surface devitrification gla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02
CPCC03C10/00
Inventor 王觅堂李梅方龙柳召刚胡艳宏张晓伟
Owner INNER MONGOLIA UNIV OF SCI & TECH
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