Glass-ceramic with nanocrystal clusters distributed in glass phase and method for preparing same

A technology of glass-ceramic and nano-crystal, which is applied in the field of glass-ceramic and its preparation, can solve the problems of weakening glass phase performance, comprehensive utilization rate of less than 10%, and decline of glass-ceramic material performance, and achieve the effect of improving mechanical properties

Active Publication Date: 2017-06-27
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the comprehensive utilization rate of metal tailings in my country is less than 10%. Therefore, it is imminent to improve the comprehensive utilization of tailings.
The crystal phase of the existing silicate glass-ceramics is mainly composed of granular crystals or dendrites with an average size of several hundred nanometers to tens of microns; while the glass phase is a long-range disordered amorphous solid, which can be seen in high-resolution transmission electron microscopy. In the micro mode, it is observed that there are no crystal diffraction spots and long-range disordered arrangement of atoms, such as figure 1 shown; and in addition to Si and O, the glass phase of silicate glass-ceramics also often contains Ca, Mg, Al, Fe, Na and other cations that destroy the Si-O bond, which weakens the performance of the glass phase, and Ultimately resulting in a decline in the performance of the entire glass-ceramic material

Method used

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  • Glass-ceramic with nanocrystal clusters distributed in glass phase and method for preparing same
  • Glass-ceramic with nanocrystal clusters distributed in glass phase and method for preparing same
  • Glass-ceramic with nanocrystal clusters distributed in glass phase and method for preparing same

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Effect test

Embodiment 1

[0035] A method for preparing glass-ceramics distributed with nanocrystal clusters in a glass phase:

[0036] (1) According to the weight ratio of the chemical composition of the glass-ceramics: 50% SiO 2 , 20% CaO, 5.04% Al 2 o 3 , 7.73% MgO, 0.55% Na 2 O, 2% B 2 o 3 , 3%CaF 2 , 3.43% Fe 2 o 3 , 0.25%Cr 2 o 3 and 8% La 2 o 3 , the weight ratio of raw materials: 50% Baiyun Obo tailings, 15% fly ash, 15% SiO 2 , 6.75% CaO, 2% borax, 3% CaF 2 , 0.25%Cr 2 o 3 and 8% La2 o 3 ;

[0037] (2) Mixing: Put the raw materials with a good ratio into the ball mill for 60 minutes and grind to below 40 mesh;

[0038] (3) Melting: Put the uniformly mixed raw materials into the crucible, and use a high-temperature resistance furnace to melt, clarify and homogenize at 1400-1500°C;

[0039] (4) Forming and annealing: casting the melted and clarified glass solution on a stainless steel mold to form a basic glass sample, annealing the basic glass sample at 600°C for 4 hours and c...

Embodiment 2

[0044] A method for preparing glass-ceramics distributed with nanocrystal clusters in a glass phase:

[0045] (1) Weight ratio of raw materials: 50% Baiyun Obo tailings, 15% fly ash, 22% SiO 2 , 7.05% CaO, 2% borax, 3% CaF 2 , 0.25%Cr 2 o 3 and 0.7% La 2 o 3 +CeO 2 ;

[0046] (2) Mixing: Put the raw materials with a good ratio into the ball mill for 60 minutes and grind to below 40 mesh;

[0047] (3) Melting: Put the uniformly mixed raw materials into the crucible, and use a high-temperature resistance furnace to melt, clarify and homogenize at 1400-1500°C;

[0048] (4) Forming and annealing: casting the melted and clarified glass solution on a stainless steel mold to form a basic glass sample, annealing the basic glass sample at 600°C for 4 hours and cooling with the furnace to eliminate the stress in the sample;

[0049] (5) Heat treatment: Nucleate the basic glass sample after annealing at 680°C for 2 hours and crystallize it at 860°C for 2 hours to prepare a glass-...

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Abstract

The invention relates to a microcrystalline glass with nanocrystal clusters distributed in the glass phase, and a preparation method thereof. The microcrystalline glass contains 35-65wt% of SiO2, 10-30wt% of CaO, 3-15wt% of Al2O3, 3-15wt% of MgO, 0-5wt% of Na2O, 0-5wt% of K2O, 2-5wt% of B2O3, 1-8wt% of CaF2, 5-15wt% of Fe2O3, 0.01-5wt% of Cr2O3 and 0.1-8wt% of REO. Rare earth oxide (REO) is added to make crystal clusters formed in the glass phase in order to improve the mechanical performances of the microcrystalline glass. The microcrystalline glass prepared through the method has the advantages of low production cost, simple preparation method, wide application range and good mechanical performances.

Description

technical field [0001] The invention relates to a glass-ceramic and a preparation method thereof, in particular to a glass-ceramic with nano crystal clusters distributed in a glass phase and a preparation method thereof, belonging to the field of glass-ceramic ceramics. Background technique [0002] With the rapid economic development and the gradual depletion of primary resources such as metal minerals and coal, it is urgent to make high-value utilization of secondary resources such as tailings, blast furnace slag, and fly ash to accelerate the development of circular economy. At present, the comprehensive utilization rate of metal tailings in my country is less than 10%. Therefore, it is imminent to improve the comprehensive utilization of metal tailings. Many researchers have carried out the research and practice of tailings reprocessing, backfilling mines, and production of glass-ceramic, among which CaO- Al 2 o 3 -SiO 2 -MgO-based glass-ceramic whose main crystal ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/04C03B32/02
Inventor 陈华李保卫赵鸣张雪峰杜永胜马超邓磊波
Owner INNER MONGOLIA UNIV OF SCI & TECH
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