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Preparation method of fluorescent ceramic containing aluminum oxide matrix and related fluorescent ceramic

A technology of fluorescent ceramics and alumina, applied in the preparation of fluorescent ceramics and related fluorescent ceramics field, can solve the problems of low thermal conductivity and low luminous efficiency of fluorescent ceramics, and achieve high thermal conductivity, high luminous efficiency, and improved thermal conductivity. Effect

Active Publication Date: 2017-10-24
APPOTRONICS CORP LTD
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Problems solved by technology

[0005] In view of the defects of low thermal conductivity and low luminous efficiency of the prepared fluorescent ceramics in the above-mentioned prior art, the present invention provides a method for preparing fluorescent ceramics with high thermal conductivity and high luminous efficiency, which includes the following steps in sequence:

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  • Preparation method of fluorescent ceramic containing aluminum oxide matrix and related fluorescent ceramic

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preparation example Construction

[0024] like figure 1 It is a flowchart of a method for preparing fluorescent ceramics according to an embodiment of the present invention. As shown in the figure, the preparation method includes the following steps in sequence:

[0025] ① Mixing: uniformly mix alumina, fluorescent powder, sintering aid and grinding solvent to obtain fluorescent ceramic precursor slurry. ~0.1μm;

[0026] ②Calcination: Dry the fluorescent ceramic precursor slurry, and then calcinate it in an aerobic atmosphere to remove water and organic matter, and obtain fluorescent ceramic precursor powder;

[0027] ③ Sintering: Sinter the fluorescent ceramic precursor powder to obtain fluorescent ceramics. The sintering temperature is 1250-1550°C, the sintering pressure is 30-200MPa, and the sintering is carried out in an oxygen-free atmosphere. High pressure pretreatment above 5MPa.

[0028] In the mixing step, the first is the selection of raw materials. In this embodiment, ultra-fine alumina powder wi...

Embodiment 1

[0042] The raw materials are high-purity ultra-fine alumina nano-powder with a particle size of 0.08-0.2 μm, high-purity ultra-fine nano-yttrium oxide powder with a particle size of 0.05-0.1 μm, and high-purity ultra-fine nano-magnesia powder with a particle size of 0.05-0.1 μm. 0.05-0.1μm, choose YAG:Ce 3+ Phosphor powder, the particle size is 15-20μm.

[0043] Weigh a certain amount of alumina powder (39.9wt%), yttrium oxide powder (0.05wt%), magnesium oxide powder (0.05wt%) and YAG:Ce 3+ Phosphor powder (60wt%). Put alumina powder, yttrium oxide powder and magnesium oxide powder into a polytetrafluoroethylene ball mill jar, add an appropriate amount of ethanol as a grinding solvent, add an appropriate amount of ceramic dispersant as a dispersant, and use ultra-low loss rate zirconia balls Carry out ball milling for the first time, and the ball milling time is 5h.

[0044] After the first ball milling, add YAG:Ce 3+ The fluorescent powder is put into the ball milling tan...

Embodiment 2

[0049] The raw materials are high-purity ultra-fine alumina nano-powder with a particle size of 0.08-0.2 μm, high-purity ultra-fine nano-yttrium oxide powder with a particle size of 0.05-0.1 μm, and high-purity ultra-fine nano-magnesia powder with a particle size of 0.05-0.1 μm. 0.05-0.1μm, choose YAG:Ce 3+ Phosphor powder, the particle size is 15-20μm.

[0050] Take a certain amount of alumina powder (30wt%), yttrium oxide powder (0.5wt%), magnesium oxide powder (0.5wt%) and YAG:Ce 3+ Phosphor powder (69wt%). Put alumina powder, yttrium oxide powder and magnesium oxide powder into a polytetrafluoroethylene ball mill jar, add an appropriate amount of ethanol as a grinding solvent, add an appropriate amount of ceramic dispersant as a dispersant, and use ultra-low loss rate zirconia balls Carry out the first ball milling, and the ball milling time is 24h.

[0051] After the first ball milling, add YAG:Ce 3+ The fluorescent powder is put into the ball mill tank, and the secon...

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Abstract

The invention provides a preparation method of a fluorescent ceramic containing aluminum oxide matrix. The preparation method sequentially comprises the following steps: mixing aluminum oxide, fluorescent powder and a sintering additive and calcining to obtain fluorescent ceramic precursor powder; sintering the powder to obtain the fluorescent ceramic. The grain diameter of each component is selected to be a pre-set size and the fluorescent ceramic precursor powder is subjected to high-pressure treatment under the condition of 5MPa or above before a sintering process; the fluorescent ceramic precursor powder bears the high pressure of 30MPa to 200MPa in the sintering process and the sintering temperature is 1250 DEG C to 1550 DEG C; the sintering is carried out under an oxygen-free atmosphere. According to the preparation method provided by the invention, the aluminum oxide enters a liquid phase at relatively low temperature under the condition that the fluorescent powder has an unchanged crystal new look in a preparation process and the uniform and dense fluorescent ceramic with low porosity is obtained; the heat-conducting performance and luminous efficiency of the fluorescent ceramic are extremely improved.

Description

technical field [0001] The invention relates to the field of fluorescent ceramics, in particular to a method for preparing fluorescent ceramics with an alumina matrix and related fluorescent ceramics. Background technique [0002] With the development of laser display technology, the technology of blue laser excitation of fluorescent materials to obtain visible light has been continuously paid attention to. The current research direction is mainly to develop new fluorescent materials (wavelength conversion materials) based on the characteristics of laser excitation phosphor powder. The main The requirements are high luminous brightness, ability to withstand high-power laser irradiation, high optical conversion efficiency, and high thermal conductivity. [0003] Traditional fluorescent ceramics are mainly developed for the luminous characteristics of LEDs. Due to the low power of LED chips and the low power density of blue light emitted, the luminous efficiency of luminous ce...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/645
CPCC04B35/10C04B35/622C04B35/645C04B2235/3206C04B2235/3224C04B2235/3225C04B2235/5436C04B2235/5445C04B2235/602C04B2235/9607C04B2235/9646C09K11/64
Inventor 李乾王艳刚陈雨叁许颜正
Owner APPOTRONICS CORP LTD
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