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A method for preparing wollastonite glass-ceramics

A technology for glass-ceramic and wollastonite, which is applied in the field of preparing wollastonite glass-ceramic, can solve the problems of different crystallization conditions on the surface and inside, no coarse crystal flowers, shallow densification depth of the surface layer, etc.

Active Publication Date: 2020-10-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CaO-SiO 2 The system is not a glass system that is easy to crystallize, and the precipitation of wollastonite crystals is relatively difficult. In order to precipitate wollastonite crystals in the glass, the chemical composition and heat treatment process of the basic glass have strict requirements.
At present, sintered wollastonite glass-ceramics still has many pores, large sintering deformation, shallow densification depth of the surface layer, different crystallization conditions on the surface and inside, and the precipitated grains are fine and do not show coarse crystal flowers, resulting in microcrystalline The appearance of the glass is not beautiful enough, etc.

Method used

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  • A method for preparing wollastonite glass-ceramics
  • A method for preparing wollastonite glass-ceramics
  • A method for preparing wollastonite glass-ceramics

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Experimental program
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Effect test

Embodiment 1

[0022] The present invention uses a high-voltage electric field to induce crystallization to prepare wollastonite glass-ceramics. The method includes two processes: melting of matrix glass, crystallization and sintering of glass-ceramics, and is specifically carried out according to the following steps:

[0023] 1) Mixing of raw materials: CaCO 3 , SiO 2 、Na 2 O.B 2 o 3 , ZnO, Al 2 o 3 , MgO, K 2 O.P 2 o 5 Mix well to obtain a mixture. The specific ratio of raw materials is shown in Table 1 below.

[0024] The weight percentage of each raw material of table 1 embodiment 1

[0025] CaCO 3

SiO 2

Na 2 o

B 2 o 3

ZnO al 2 o 3

MgO K 2 o

P 2 o 5

total wt.% 26 54 4 2.5 3 3.5 2 2 3 100

[0026] 2) Use absolute ethanol to prepare the mixture into a slurry, the mass ratio of absolute ethanol to the mixture is 2.6:1; the slurry is ball milled for 4 hours and then put into a drying box, and the dr...

Embodiment 2

[0034] 1) Mixing of raw materials: CaCO 3 , SiO 2 、Na 2 O.B 2 o 3 , ZnO, Al 2 o 3 , MgO, K 2 O.P 2 o 5 (One or more of lanthanum oxide, cerium oxide, neodymium oxide, erbium oxide or terbium oxide) are mixed evenly to obtain a mixture. The specific raw material ratios are shown in Table 3 below.

[0035] The weight percent of each raw material of table 3 embodiment 2

[0036] CaCO 3

SiO 2

Na 2 o

B 2 o 3

ZnO al 2 o 3

MgO K 2 o

P 2 o 5

total wt.% 38 49 3 1.5 2 1.5 1.5 1.5 2 100

[0037] 2) Use absolute ethanol to prepare the mixture into a slurry, the mass ratio of absolute ethanol to the mixture is 2.8:1; the slurry is ball milled for 4 hours and then put into a drying box, and the drying temperature is 40°C. Dry it, then keep it at 850°C for 3 hours to get a calcined block, put the calcined block into a high-purity corundum crucible, keep it in a muffle furnace at 1480°C for 4 hours t...

Embodiment 3

[0043] 1) Mixing of raw materials: CaCO 3 , SiO 2 、Na 2 O.B 2 o 3 , ZnO, Al 2 o 3 , MgO, K 2 O.P 2 o 5 (One or more of lanthanum oxide, cerium oxide, neodymium oxide, erbium oxide or terbium oxide) are mixed evenly to obtain a mixture. The specific ratio of raw materials is shown in Table 5 below.

[0044] The weight percent of each raw material of table 5 embodiment 3

[0045] CaCO 3

SiO 2

Na 2 o

B 2 o 3

ZnO al 2 o 3

MgO K 2 o

P 2 o 5

total wt.% 34 51 3 2 2 1.5 1.5 1.5 2.5 100

[0046] 2) Use absolute ethanol to prepare the mixture into a slurry, the mass ratio of absolute ethanol to the mixture is 2.55:1; the slurry is ball milled for 4 hours and then put into a drying box, and the drying temperature is 40°C. Dry it, then keep it at 850°C for 4.5h to get a calcined block, put the calcined block into a high-purity corundum crucible, and keep it at 1480°C for 3.5h in a muffle furnace ...

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Abstract

The invention discloses a method for preparing wollastonite glass-ceramics. The method comprises uniformly mixing CaCO3, SiO2, Na2O, B2O3, ZnO, Al2O3, MgO, K2O and P2O5 to obtain a mixed material, blending the mixed material and anhydrous ethanol to obtain slurry, carrying out uniform ball milling mixing on the slurry, carrying out drying, melting the mixture at a high temperature to obtain a clear glass liquid, pouring the glass liquid into cold water for quenching to obtain glass fragments, drying the glass fragments, carrying out crushing and ball milling to obtain glass powder, pressing to mold the glass powder, and sintering the molded glass powder in a direct current high voltage electric field to obtain wollastonite glass-ceramics. Through the high voltage electric field, the growth of grains during sintering is promoted so that the glass-ceramics can precipitate a lot of large size crystals and the sample of the wollastonite glass-ceramics form crystal pattern appearance. The crystals and a glass base have different refractive indexes so that shining effects are formed and the appearance of the wollastonite glass-ceramics is greatly improved.

Description

technical field [0001] The invention relates to a preparation process of glass-ceramics, in particular to a method for preparing wollastonite glass-ceramics. Background technique [0002] Wollastonite glass-ceramic is a new building decoration material that replaces natural stone. Compared with ordinary stone, the glass-ceramic plate has a dense structure, natural luster and clear texture, uniform, soft and delicate texture, bright colors, and no radioactivity. Pollution, weathering resistance, wear resistance, compression and other physical and chemical performance indicators are better than natural granite, much higher than natural marble. From the perspective of on-site construction, the wollastonite glass-ceramic plate is easy to install, reliable in process, and has certain machinability. After heating and softening, it can be processed into the required shape, which is convenient and time-saving. Therefore, this material is considered as a high-grade green building de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00
CPCC03C10/0009
Inventor 张佩朱建锋林营杨海波方媛武清武文玲
Owner SHAANXI UNIV OF SCI & TECH
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