Near-infrared fluorescent ceramic block as well as preparation method and application thereof
A fluorescent ceramic and near-infrared technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of fluorescent powder epoxy resin or silica gel aging, reduce device performance and service life, and poor thermal conductivity, etc., to achieve Low cost, simple process, and easy-to-obtain raw materials
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[0090] The invention also provides a preparation method of near-infrared fluorescent ceramics. The preparation method comprises the following steps:
[0091] S1, providing raw materials and performing ball milling, drying, and burning in sequence to obtain powder;
[0092] S2, performing grinding, molding, and cold isostatic pressing on the powder in sequence to obtain a green body;
[0093] S3, in an oxygen atmosphere, sintering the green body to obtain prefabricated ceramics;
[0094] S4, annealing the prefabricated ceramics in a reducing atmosphere to obtain fluorescent ceramic blocks.
[0095] In step S1, according to (A 1-q D. q ) 3-r C r (Ga 1-s E. s ) t-v Cr v o 12The stoichiometric ratio of the reaction raw materials was weighed. Commercially available micron or nanometer raw materials with a purity of more than 99% can be used without further processing of the raw materials, which can save costs and facilitate industrialization.
[0096] Preferably, the r...
Embodiment 1
[0111] When q=0, r=0, s=0, t=5, v=0.0001, and A is Gd and Y, the general chemical formula of the near-infrared fluorescent ceramic is (Gd, Y) 3 Ga 4.9999 Cr 0.0001 o 12 .
[0112] The preparation method of this near-infrared fluorescent ceramic is as follows:
[0113] According to the proportion of the above formula, weigh commercially available high-purity Gd 2 o 3 , Y 2 o 3 , Ga 2 o 3 、Cr 2 o 3 as a reaction material. Use polytetrafluoroethylene balls with a diameter of 5mm as the grinding balls for the weighed reaction raw materials, and use absolute ethanol as the ball milling medium. , balls and media were put into a polytetrafluoroethylene ball mill jar, and ball milled in a planetary ball mill at a speed of 300 rad / min for 12 hours to obtain a slurry. After the slurry was dried at 70°C for 12h in a blast drying oven, it was fired at 600°C for 2h to obtain a powder.
[0114] The powder was ground in a corundum crucible, passed through a 200-mesh sieve, and ...
Embodiment 2
[0118] When q=0.1, r=0.01, s=0.2, t=5, v=0.01, A is Gd, D is Lu, C is Ce, and E is Al, the chemical general formula of this near-infrared fluorescent ceramic is (Gd 0.9 Lu 0.1 ) 2.99 Ce 0.01 (Ga 0.8 al 0.2 ) 4.99 Cr 0.01 o 12 .
[0119] The preparation method of this near-infrared fluorescent ceramic is as follows:
[0120] According to the proportion of the above formula, weigh commercially available high-purity Gd 2 o 3 、Lu 2 o 3 、Ce 2 (CO 3 ) 3 , Ga 2 o 3 、Al 2 o 3 、Cr 2 o 3 as a reaction material. The weighed reaction raw material is used as a grinding ball with a diameter of 5mm polytetrafluoroethylene ball, and absolute ethanol is used as a ball milling medium. The balls and media were put into a polytetrafluoroethylene ball mill tank, and the slurry was obtained after ball milling in a planetary ball mill at a speed of 300 rad / min for 12 hours. After the slurry was dried at 70°C for 12h in a blast drying oven, it was fired at 900°C for 2h to obtai...
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