Method for preparing YAG (yttrium aluminum garnet) nano-powder through stearate melting method

Abstract

The invention discloses a method for preparing YAG (yttrium aluminum garnet) nano-powder through a stearate melting method and belongs to the technical field of materials. The method comprises the following steps: (1) mixing a stearic acid ethanol solution and a yttrium nitrate solution to prepare a yttrium-stearic acid mixed solution; (2) heating the yttrium-stearic acid mixed solution and dropwise adding ammonia water, insulating the heat and preparing yttrium stearate emulsion; (3) performing centrifugal separation, washing a solid phase, drying and preparing yttrium stearate powder; (4) mixing the stearic acid ethanol solution and an aluminum nitrate solution to prepare an aluminum-stearic acid mixed solution; (5) heating the aluminum-stearic acid mixed solution, dropwisde ammonia water, insulating the heat and preparing aluminum tristearate emulsion; (6) performing centrifugal separation, washing a solid phase, drying and preparing aluminum tristearate powder; (7) mixing the two powders, heating into a molten state, uniformly stirring, thus obtaining a solid precursor; and (8) calcining to prepare the YAG nano-powder. The prepared YAG nano-powder is high in purity, uniform in particles and high in dispersibility and is suitable for preparing fluorescent powder and laser transparent ceramics. The method has the advantages of low reaction temperature, simplicity in popularization and the like and hardly causes environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing YAG nanometer powder by a stearate melting method. Background technique [0002] YAG (Yttrium Aluminum Garnet) is the abbreviation of yttrium aluminum garnet, chemical formula Y 3 A1 5 o 12 , belongs to the cubic crystal system, the chemical properties are very stable, and it has good optical and mechanical properties. Doped with Ce 3+ 、Dy 3+ , Yb 3+ 、Nd 3+ Rare earth ions such as rare earth ions can be used to prepare rare earth phosphors and laser transparent ceramics, which have great applications in lighting, laser, medicine, and national defense. [0003] Good nano powder is the key to application, which requires YAG powder to have precise stoichiometric ratio (Y:Al=3:5), high purity, controllable particle size; high dispersion, no hard agglomeration The particle size is uniform; the current methods for preparing YAG powder include solid-phas...

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Problems solved by technology

[0003] Good nano powder is the key to application, which requires YAG powder to have precise stoichiometric ratio (Y:Al=3:5), high purity, controllable particle size; high dispersion, no hard agglomeration The particle size is uniform; the current methods for preparing YAG powder include solid-phase method and wet chemical method, but both have certain shortcomings; the solid-phase reaction method requires high reaction temperature (1300~1500°C), long reaction time, and Multiple ball milling, ball milling is easy to introduce impurities to cause lattice defects, and ball milling is difficult to achieve a high uniformity of chemical composition; wet chemical methods include precipitation method, sol-gel method, combustion method, solvothermal method, etc.; these methods of synthesizing YAG powder Although the phase formation temperature is relatively low, the precursor contains surface water molecules and structural water, and the resulting surface tension and powder agglomeration caused by hydrogen bonds are difficult to eliminate, and the difference in the solubility and sedimentation rate of the precursor cations, Difficult to obtain powders with precise stoichiometric ratio and uniform composition

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