A kind of preparation method of aluminum nitride-based fluorescent ceramics and related fluorescent ceramics
A technology of fluorescent ceramics and aluminum nitride, applied in the field of fluorescent ceramics, can solve the problems of low thermal conductivity and low luminous efficiency of fluorescent ceramics, and achieve the effects of high thermal conductivity, high luminous efficiency and improved thermal conductivity.
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[0027] Such as 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:
[0028] ① Mixing: Mix aluminum nitride and phosphor liquid phase to obtain aluminum nitride-phosphor powder slurry, the particle size of aluminum nitride is 0.1-1 μm, and the particle size of phosphor is 10-30 μm;
[0029] ② Removal of impurities: drying the aluminum nitride-phosphor powder slurry, and then calcining it in an aerobic atmosphere to remove water and organic matter to obtain aluminum nitride-phosphor powder powder;
[0030] ③Heat treatment: Aluminum nitride-phosphor powder is heat-treated to obtain fluorescent ceramics. The aluminum nitride-phosphor powder is subjected to high-pressure treatment before and / or during heat treatment. The heat treatment temperature is 1500-1850°C. under an oxygen atmosphere.
[0031] In the mixing step...
Embodiment 1
[0046] Weigh aluminum nitride with a particle size of 0.5-1 μm, put it into a ball mill jar, add an appropriate amount of grinding solvent, thickener and ceramic dispersant, and then add grinding bodies for ball milling. When the slurry in the ball mill becomes viscous and suspended, add YAG:Ce with a particle size of 15-25 μm 3+ For the phosphor particles, continue ball milling until the phosphor powder is evenly distributed, and then end the ball milling.
[0047] Then the slurry is taken out, dried in vacuum at constant temperature to obtain dry powder, and the dry powder is calcined in a muffle furnace to remove organic components in the dry powder to obtain high-purity aluminum nitride-phosphor powder. The powder is then sieved and granulated to obtain heat-treated raw material powder.
[0048] Weigh an appropriate amount of raw material powder and put it into a graphite mold, press and form it under a pressure of 5MPa, put the aluminum nitride-phosphor powder together w...
Embodiment 2
[0050] Weigh aluminum nitride with a particle size of 0.1-0.5 μm, put it into a ball mill jar, add an appropriate amount of grinding solvent, thickener and ceramic dispersant, and then add grinding bodies for ball milling. When the slurry in the ball mill becomes viscous and suspended, add LuAG:Ce 3+ For the phosphor particles, continue ball milling until the phosphor powder is evenly distributed, and then end the ball milling.
[0051] Then the slurry is taken out, dried in vacuum at constant temperature to obtain dry powder, and the dry powder is calcined in a muffle furnace to remove organic components in the dry powder to obtain high-purity aluminum nitride-phosphor powder. The powder is then sieved and granulated to obtain heat-treated raw material powder.
[0052] Weigh an appropriate amount of raw material powder and put it into a metal mold, perform compression molding under a pressure of 40MPa, and then undergo cold isostatic pressing molding at a pressure of 200MPa,...
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