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A kind of high crystallinity transparent glass-ceramic crystallized by "melting-cooling" method

A glass-ceramic, high crystallinity technology, applied in the field of new glass materials, to achieve the effects of high transparency, lower production costs, and easy operation

Active Publication Date: 2018-06-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on the preparation of transparent glass-ceramics with high crystallinity (actual crystallinity / theoretical crystallinity close to 1.0) by spontaneous crystallization during the cooling process of glass melt

Method used

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  • A kind of high crystallinity transparent glass-ceramic crystallized by "melting-cooling" method
  • A kind of high crystallinity transparent glass-ceramic crystallized by "melting-cooling" method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The parts by weight of raw materials used consist of: 58.64 parts of quartz sand (equivalent to 58.35 parts of SiO 2 ), 16.80 parts of diammonium hydrogen phosphate (equivalent to 8.89 parts of P 2 o 5 ), 33.88 parts of sodium carbonate (equivalent to 19.41 parts of Na 2 O), 4.51 parts of magnesium oxide (equivalent to 4.42 parts of MgO), 9.02 parts of zinc oxide (equivalent to 8.93 parts of ZnO).

[0018] Weigh and mix uniformly according to the above composition and keep warm in an electric furnace at 1480°C for 3 hours, cast the homogenized glass melt into a steel mold preheated at 930°C, and then cool it in a precision annealing furnace at 15°C / min The speed drops from 930°C to 520°C. After annealing for 30 minutes and then cooling to room temperature with the furnace, a block of colorless and transparent glass-ceramic material is formed; when the thickness is 3.0mm, the transmittance at 650nm wavelength is 90%. The crystal is Na 3 PO 4 , and its crystallinity ...

Embodiment 2

[0020] The parts by weight of raw materials used consist of: 55.83 parts of quartz sand (equivalent to 55.55 parts of SiO 2 ), 15.99 parts of diammonium hydrogen phosphate (equivalent to 8.46 parts of P 2 o 5 ), 16.13 parts of sodium carbonate (equivalent to 9.24 parts of Na 2 O), 20.97 parts of potassium carbonate (equivalent to 14.05 parts of K 2 O), 4.29 parts of magnesium oxide (equivalent to 4.21 parts of MgO), 8.58 parts of zinc oxide (equivalent to 8.50 parts of ZnO).

[0021] Weigh and mix the above components evenly and keep warm in an electric furnace at 1490°C for 3 hours, cast the homogenized glass melt into a steel mold preheated at 880°C, and then heat it in a precision annealing furnace at a temperature of 15°C / min. The cooling rate is reduced from 880°C to 520°C. After annealing for 30 minutes, it is cooled to room temperature with the furnace to form a colorless and transparent glass-ceramic material; when the thickness is 3.0mm, the transmittance at 650nm ...

Embodiment 3

[0023] The parts by weight of raw materials used consist of: 57.20 parts of quartz sand (equivalent to 56.91 parts of SiO 2 ), 16.39 parts of diammonium hydrogen phosphate (equivalent to 8.67 parts of P 2 o 5 ), 24.78 parts of sodium carbonate (equivalent to 14.20 parts of Na 2 O), 10.74 parts of potassium carbonate (equivalent to 7.2 parts of K 2 O), 4.40 parts of magnesium oxide (equivalent to 4.31 parts of MgO), 8.79 parts of zinc oxide (equivalent to 8.70 parts of ZnO).

[0024] Weigh and mix the above components uniformly and keep warm in an electric furnace at 1500°C for 3 hours, cast the homogenized glass melt into a steel mold preheated at 880°C, and then heat it in a precision annealing furnace at a temperature of 15°C / min. The cooling rate is reduced from 880°C to 520°C. After annealing for 30 minutes, it is cooled to room temperature with the furnace to form a colorless and transparent glass-ceramic material; when the thickness is 3.0mm, the transmittance at 650n...

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Abstract

The invention relates to the field of glass novel materials, in particular to high-crystallinity transparent glass ceramics prepared by crystallization of a melting and cooling method. The high-crystallinity transparent glass ceramics are prepared by taking SiO2, Al2O3, P2O5, Na2O, K2O, MgO and ZnO as effective materials according to certain weight proportions. The preparation method comprises the following steps of mixing raw materials to prepare a uniform batch mixture; melting and insulating the batch mixture at the temperature of 1480 to 1510DEG C for 3 hours, and then casting a homogenized glass melt in a steel mold preheated at the temperature of 880 to 950DEG C; subsequently, cooling in a precision annealing furnace at the cooling speed of 15 to 25DEG C / per minute to glass transition temperature(Tg); annealing for 30 minutes to one hour, and then cooling along with the furnace to room temperature, thus obtaining the high-crystallinity transparent glass ceramic material. According to the high-crystallinity transparent glass ceramics disclosed by the invention, by controlling the cooling speed of a crystallization temperature interval, a glass melt is sufficiently crystallized in a slow cooling process, and further highcrystallinity is obtained, so that a secondary reheating process of traditional high-crystallinity transparent glass ceramics in the preparation method is omitted.

Description

technical field [0001] The invention relates to a method for preparing transparent glass-ceramics with high crystallinity by utilizing spontaneous crystallization in the cooling process of melt, and belongs to the field of new glass materials. Background technique [0002] Transparent glass-ceramic has been widely used in architectural decoration, laser gain medium and display fields because of its good physical and chemical properties. Its physical and chemical properties are closely related to the crystal content in glass-ceramic, so it is usually required to obtain as high crystallinity as possible. Regarding high crystallinity, it can be understood that the volume content of crystals in glass-ceramics is relatively high (generally greater than 50%); on the other hand, it can be understood that for a given certain crystal form, its actual crystallinity / theoretical crystallinity is close to 1.0 . Usually, people use the basic glass heat treatment method to obtain high cry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03B25/00
CPCC03B25/00C03C10/00
Inventor 刘树江
Owner QILU UNIV OF TECH