Preparation of CE:YAG glass-ceramics by combustion synthesis in hypergravity field

A technology of glass ceramics and supergravity field, which is applied in the field of combustion synthesis to prepare Ce:YAG glass ceramics, which can solve the problems of long preparation cycle, low YAG crystal phase content, and high production cost, and achieve short preparation cycle and high YAG crystal phase content , the effect of low production cost

Active Publication Date: 2016-01-06
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of Ce:YAG glass-ceramics by combustion synthesis in a high-gravity field can make up for the shortcomings of low YAG crystal phase content, long preparation period and high production cost in Ce:YAG glass-ceramics prepared by existing methods

Method used

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  • Preparation of CE:YAG glass-ceramics by combustion synthesis in hypergravity field
  • Preparation of CE:YAG glass-ceramics by combustion synthesis in hypergravity field
  • Preparation of CE:YAG glass-ceramics by combustion synthesis in hypergravity field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] CuO, Al, Y 2 o 3 , SiO 2 , B 2 o 3 , CeF 3 The raw materials are uniformly mixed according to the proportions shown in Table 1 and compacted to obtain a thermite prefabricated block with a relative density of 60%, and the obtained thermite prefabricated block is put into a graphite crucible and placed in a high-gravity device; then In a supergravity field with a vacuum degree of 10Pa and a centrifugal force of 5000g, the heat generated by the electrified tungsten spiral wire induces a high-temperature thermite reaction between various raw materials in the thermite prefabricated block, and the product of the thermite reaction, the glass ceramic melt and Metal melts are rapidly separated, densified and cooled in a supergravity field to obtain glass-ceramic solids and metal solids, wherein the glass-ceramic solids are Ce:YAG glass-ceramics obtained by spontaneous crystallization of glass-ceramic melts during cooling.

[0021] Table 1

[0022] components

[...

Embodiment 2

[0025] CuO, Al, Y 2 o 3 , SiO 2 , B 2 o 3 , CeF 3 The raw materials are uniformly mixed according to the proportion shown in Table 2 and compacted to obtain a thermite prefabricated block with a relative density of 50%, and the obtained thermite prefabricated block is put into a graphite crucible and placed in a high-gravity device; then In a supergravity field with a vacuum degree of 500Pa and a centrifugal force of 3000g, the heat generated by the electrified tungsten spiral wire induces a high-temperature thermite reaction between various raw materials in the thermite prefabricated block, and the product of the thermite reaction, the glass ceramic melt and Metal melts are rapidly separated, densified and cooled in a supergravity field to obtain glass-ceramic solids and metal solids, wherein the glass-ceramic solids are Ce:YAG glass-ceramics obtained by spontaneous crystallization of glass-ceramic melts during cooling.

[0026] Table 2

[0027] components

[...

Embodiment 3

[0030] CuO, Al, Y 2 o 3 , SiO 2 , B 2 o 3 , CeF 3The raw materials are uniformly mixed according to the proportions shown in Table 3 and compacted to obtain a thermite prefabricated block with a relative density of 40%, and the obtained thermite prefabricated block is put into a graphite crucible and placed in a high-gravity device; then In a supergravity field with a vacuum degree of 1000Pa and a centrifugal force of 500g, the heat generated by the energized tungsten spiral wire induces a high-temperature thermite reaction between various raw materials in the thermite prefabricated block, and the product of the thermite reaction is the glass ceramic melt. Metal melts are rapidly separated, densified and cooled in a supergravity field to obtain glass-ceramic solids and metal solids, wherein the glass-ceramic solids are Ce:YAG glass-ceramics obtained by spontaneous crystallization of glass-ceramic melts during cooling.

[0031] table 3

[0032] components

[003...

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Abstract

The invention belongs to the technical field of inorganic optical materials and particularly relates to a method for preparing Ce:YAG glass ceramic in a super-gravity field by combustion synthesis. According to the method, either of Al-CuO and Al-NiO is taken as a reaction system; Y2O3, SiO2, B2O3 and CeF3 are taken as diluents; in the super-gravity field (500-5000g), an aluminothermic reaction at high temperature is induced among all the raw materials; the products of the aluminothermic reaction, glass ceramic melt and metal melt are separated quickly, densified and cooled in the super-gravity field to obtain a glass ceramic solid and a metal solid, wherein the glass ceramic melt is subject to spontaneous crystallization during the cooling process to obtain the glass ceramic solid, namely, the Ce:YAG glass ceramic. The Ce:YAG glass ceramic prepared in the invention has the characteristics of high YAG crystalline phase content, short preparation period, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic optical materials, and in particular relates to a method for preparing Ce:YAG glass ceramics by combustion synthesis in a supergravity field. Background technique [0002] White LED has the advantages of all solid state, no pollution, high efficiency and long life, and will gradually replace traditional incandescent and fluorescent lamps, becoming a new generation of lighting sources. At present, commercial white LEDs are mainly combined with YAG:Ce 3+ The yellow phosphor forms white light and is encapsulated in epoxy resin. However, in practical applications, there are unavoidable problems such as uneven coating of phosphor powder, low thermal conductivity of epoxy resin and easy aging under long-term exposure to ultraviolet light, resulting in decreased brightness of phosphor powder, color drift, and shortened lifespan. As the market demand for high-power white LEDs continues to increase, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02
Inventor 李江涛贺刚徐昆源刘光华杨增朝郭世斌
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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