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Method of coating micrometer sized inorganic particles

A technology of inorganic particles and particles, applied in the direction of granulating raw materials, devices for coating liquid on surfaces, coating particles, etc.

Inactive Publication Date: 2002-05-29
SARNOFF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not require the use of any solvent

Method used

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  • Method of coating micrometer sized inorganic particles
  • Method of coating micrometer sized inorganic particles

Examples

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Embodiment 1

[0025] 50 g of dry SrS:Eu:Er:Dy phosphor with a particle size of 1-100 μm that continuously emits orange light for tens of minutes when excited with UV or visible light was mixed with 5 g of fumed silica particles with an average particle size of 7 nm . Fumed silica particles having a particle size of about 2-3 to 50 nm are commercially available as Aerosil 300(R) from DeGussa Corporation. Their softening point is about 800°C.

[0026] The phosphor and silica particles were placed in a 200 ml cap-sealed container using a motor-driven mixer (TURBULA, a trade name of Glen Mills, New Jersey) with the aid of an approximately 1 / 2 inch x 1 / 2 inch Cylindrical ceramic grinding balls mixed them together for 30 minutes before placing them in the container. These ceramic grinding balls prevent powders and particles from agglomerating and are easily removed from coated inorganic particles using an appropriately sized screen.

[0027] These mixed powders were fired in a quartz tube furn...

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Abstract

A method for coating moisture sensitive inorganic particles, such as phosphors, comprising mixing the inorganic particles having a particle size of about 1 to 100 micrometers with nanometer-sized coating particles, and firing the mixture to soften or melt the nanometer-sized particles about the inorganic particles, forming a moisture impervious coating. The coated particles are washed to remove excess particles, and dried.

Description

[0001] This application claims priority to provisional application 60 / 134,918, filed May 19,1999. Background of the invention [0002] Inorganic particles sensitive to atmospheric species such as moisture can be coated by liquid-based or gas-phase methods. For example, a binder or a mineral or metal colloid can be dispersed in a liquid medium and distributed on the surface of the inorganic particles to be coated. However, these coating materials must be insoluble in and non-reactive with the solvent used. Gas-phase coating methods, for example using fluidized bed reactors, require high temperatures and long reaction times, which often lead to some surface reaction or modification of the particles to be coated. Furthermore, the equipment is complicated and expensive. [0003] As an example, long-lasting phosphors are known, which, after being struck by light, continue to emit light after causing the light source to disappear. For example, europium-activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02B01J2/00B05D3/12B05D7/00C01B17/42C09C3/06C09K11/02C09K11/08C09K11/56
CPCB01J2/006C09K11/025C09K11/7786C01P2004/60C01P2004/61C01P2004/64Y10S977/888
Inventor 田永驰
Owner SARNOFF CORP
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