A kind of fluorescent ceramics with characteristic microstructure and its preparation method and application
A technology of fluorescent ceramics and micropores, applied in ceramic products, applications, chemical instruments and methods, etc.
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[0045] The present invention relates to a design and preparation method of the internal microporous structure of fluorescent ceramics. Specifically, the present invention adopts Y 3-x-y-z Ce x Lu y Gd z Al 5-a Ga a o 12 Phosphor powder (where 02 o 3 , or add an appropriate amount of Al 2 o 3 As a matrix material, it is mixed and shaped, and after sintering, a single-phase or multi-phase fluorescent ceramic with a characteristic microstructure can be obtained. The single-phase or multi-phase fluorescent ceramics have a characteristic microstructure rich in micropores, wherein, the single-phase fluorescent ceramics only contain one phase of fluorescent crystal particles, and the multi-phase fluorescent ceramics include non-luminescent Al 2 o 3 The second phase and the above-mentioned fluorescent crystal particles. Among them, the fluorescent crystalline particles are made with yttrium aluminum garnet (Y 3 Al 5 o 12 ) is formed by doping rare earth element Ce and Lu,...
Embodiment 1
[0066] will be commercially available Y 3 Al 5 o 12 : Ce yellow fluorescent powder (100g), 2g polyvinyl alcohol are put into high-purity alumina ball mill jar, add the high-purity alumina ball (75g) and dehydrated alcohol (80g) that diameter is 5mm respectively, place ball mill on the planetary ball mill After 12 hours, the slurry was fully dried in an oven at 80°C for 12 hours, then ground, passed through a 100-mesh nylon sieve, and placed in a reagent bottle for later use.
[0067] Use the discharge plasma rapid sintering technology to sinter the uniformly mixed raw material powder, weigh 0.65g raw material powder each time, put it into a graphite mold with an inner diameter of 15mm, and put a layer of graphite paper inside the graphite mold to isolate the raw material powder body and graphite mold. The outer side of the mold is covered with a layer of heat-insulating carbon felt to prevent the heat from spreading on the surface of the mold. During the sintering process,...
Embodiment 2
[0072] will be commercially available Y 3 Al 5 o 12 : Ce yellow phosphor (39g), Al 2 o 3 Put the raw material (61g) and 0.1g dextrin into the alumina ball mill tank, add high-purity alumina balls (75g) and absolute ethanol (80g) with a diameter of 5mm respectively, place the ball mill on the planetary ball mill for 24h, and then grind the slurry Put it in an oven at 80°C for 12 hours to fully dry it, then grind it, pass through a 100-mesh sieve, and put it in a reagent bottle for later use.
[0073] After the powders were subjected to direct dry pressing (10 MPa) and cold isostatic pressing (200 MPa), the hot pressing sintering process was carried out at 10 °C min -1 The heating rate was increased to 1400℃, and the composite fluorescent ceramics were prepared under the sintering pressure of 40MPa.
[0074] The upper and lower surfaces of the sintered samples were machined respectively, and then polished to a thickness of 0.1 mm on a polishing machine.
[0075] The proces...
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Abstract
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