Method for preparing yag nanometer powder by stearate melting method

Abstract

A method for preparing YAG nanopowder by stearate melting method, which belongs to the field of material technology and is carried out according to the following steps: (1) Mix stearic acid ethanol solution and yttrium nitrate solution to prepare yttrium-stearic acid mixed solution; (2) After heating, add ammonia dropwise and keep it warm to make yttrium stearate emulsion; (3) Centrifuge, wash and dry the solid phase to make yttrium stearate powder; (4) Mix ethanol stearate with The solution is mixed with the aluminum nitrate solution to make an aluminum-stearic acid mixed solution; (5) After heating, add ammonia dropwise and keep it warm to make an aluminum tristearate emulsion; (6) Centrifuge, and the solid phase is washed and dried. Aluminum tristearate powder is made; (7) The two powders are mixed and heated until melted and stirred evenly to form a solid precursor; (8) Calcined to make YAG nanopowder. The YAG nanopowder of the present invention has high purity, uniform particles and good dispersion, and is suitable for making phosphor powder and laser transparent ceramics; the method of the present invention has the advantages of high reaction temperature, low environmental pollution, and easy promotion.

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 (YttriumAluminumGarnet) 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-phase ...

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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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