Preparation method of nano-crystal glass ceramic

A technology of glass ceramics and nano crystals, which is applied in the field of preparing nano crystal glass ceramics by microwave heat treatment, which can solve the problems of high raw material cost, low energy consumption, and long crystallization time, and achieve fast heating speed, high density, heating and sintering fast effect

Inactive Publication Date: 2014-08-20
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention: to overcome the disadvantages of high raw material cost, nucleation, and long crystallization time in the prior art, and provide a method for preparing nanocrystalline glass ceramics by microwave heat treatment, which can easily obtain a crystal grain size of Nanocrystalline glass ceramics with nanoscale and uniform structure, easy to control the crystal nucleus formation and growth process, low energy consumption, energy saving and environmental protection

Method used

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  • Preparation method of nano-crystal glass ceramic
  • Preparation method of nano-crystal glass ceramic
  • Preparation method of nano-crystal glass ceramic

Examples

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Effect test

Embodiment 1

[0034] Embodiment one: A kind of method for preparing nanocrystalline glass ceramics

[0035] 1) Taking the basic glass composition in Table 1 as an example, make a glass product, then send the glass product into a microwave oven to heat up, and keep it at 560°C for 20 minutes;

[0036] 2) Continue heating the glass product to 630°C, keep it warm for 25 minutes, and carry out microwave heat treatment in the process of crystal nucleus formation;

[0037] 3) On the basis of the microwave heat treatment of the crystal nucleus formation process, the microwave heat treatment of the crystal nucleus growth is carried out on the glass products;

[0038] Gradually heat the glass product, the specific heating method is as follows:

[0039] (1) Continue to heat up to 640°C, and keep warm at this temperature for 5 minutes;

[0040] (2) Heat up to 660°C and keep warm for 5 minutes;

[0041] (3) Heat up to 680°C and keep warm for 5 minutes;

[0042] (4) Heat up to 710°C and keep warm ...

Embodiment 2

[0047] Embodiment two: A kind of method for preparing nanocrystalline glass ceramics

[0048] 1) Taking the basic glass composition in Table 1 as an example, make a glass product, then heat it in a microwave oven, and keep it at 570°C for 20 minutes;

[0049] 2) Raise the temperature to 620°C, keep it warm for 30 minutes, and perform microwave heat treatment in the process of crystal nucleus formation;

[0050] 3) On the basis of the microwave heat treatment of the crystal nucleus formation process, the microwave heat treatment of the crystal nucleus growth is performed on the glass products;

[0051] Gradually heat the glass product, the specific heating method is as follows:

[0052] (1) Heat up to 645°C and keep warm for 4 minutes;

[0053] (2) Heat up to 652°C and keep warm for 4 minutes;

[0054] (3) Heat up to 672°C and keep warm for 4 minutes;

[0055] (4) Heat up to 702°C and keep warm for 4 minutes;

[0056](5) Heat up to 742°C and keep warm for 4 minutes;

[...

Embodiment 3

[0059] Embodiment three: A kind of method for preparing nanocrystalline glass ceramics

[0060] 1) Taking the basic glass composition in Table 1 as an example, make a glass product, then heat it in a microwave oven, and keep it at 580°C for 20 minutes;

[0061] 2) Continue to heat up to 610°C, keep it warm for 35 minutes, and carry out microwave heat treatment in the process of crystal nucleus formation;

[0062] 3) On the basis of the microwave heat treatment of the crystal nucleus formation process, the glass product is subjected to the microwave heat treatment of the crystal nucleus growth.

[0063] Gradually heat the glass product, the specific heating method is as follows:

[0064] (1) Heat up to 645°C and keep warm for 6 minutes;

[0065] (2) Heat up to 655°C and keep warm for 6 minutes;

[0066] (3) Heat up to 675°C and keep warm for 6 minutes;

[0067] (4) Heat up to 715°C and keep warm for 6 minutes;

[0068] (5) Heat up to 745°C and keep warm for 6 minutes;

...

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Abstract

The invention relates to a preparation method of nano-crystal glass ceramic. The preparation method comprises the steps of delivering a formed glass product into a microwave oven for microwave heat treatment to realize crystal nucleus formation and growth processes; finally, cooling to the room temperature. The heat treatment temperature in the crystal nucleus formation process is 610-630 DEG C; the heat treatment temperature of the crystal nucleus growth process is 640-780 DEG C. The crystal nucleus formation and growth are controlled precisely by means of microwaves, so that the nano-crystal glass ceramic with a nano-scale crystal grain size and a uniform structure can be relatively easily obtained. Due to the adoption of microwave heating, the whole material can be simultaneously heated, the heating speed is high, no thermal inertia is generated, and the temperature and time in the crystal nucleus formation and growth processes can be precisely controlled; the preparation method is simple in process, capable of effectively reducing the cost, free of pollution, capable of saving energy and environmentally friendly; in addition, the main technical indexes of the obtained nano-crystal glass ceramic product are relatively good.

Description

technical field [0001] The invention relates to a method for preparing nanocrystalline glass ceramics, in particular to a method for preparing nanocrystalline glass ceramics by using microwave heat treatment. Background technique [0002] With the development of high technology, traditional materials can no longer meet the requirements due to their own insurmountable limitations. Due to their unique and excellent properties, nanomaterials have been a research hotspot in the field of materials in recent years. Glass ceramic has good mechanical properties and can obtain extremely smooth surface, which is suitable for bearings; with its high strength and good wear resistance, it can replace steel to make chute, ball mill lining and grinding body; in addition, it can also manufacture special Cutting tools, piston heads, clutches, rotating vanes, etc. Because the expansion coefficient of glass ceramics can vary in a wide range, it can be welded well with metals; its electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04
Inventor 张雪峰李保卫贾晓林
Owner INNER MONGOLIA UNIV OF SCI & TECH
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