Alpha-siaion powder and method for producing the same

A manufacturing method, Sialon technology, applied in chemical instruments and methods, Sialon, luminescent materials, etc., can solve the problems of deterioration of luminescence characteristics, influence of fluorescence characteristics, etc.

Inactive Publication Date: 2007-09-12
NAT INST FOR MATERIALS SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] When the α-Sialon powder obtained by the conventional α-Sialon powder manufacturing method is used as a phosphor, because the surface part of the particle mainly responds to the excitation light, there is a problem that the surface defects introduced by the pulverization process will affect the phosphor. The fluorescence characteristics have a large influence, making the luminescence characteristics worse

Method used

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  • Alpha-siaion powder and method for producing the same
  • Alpha-siaion powder and method for producing the same
  • Alpha-siaion powder and method for producing the same

Examples

Experimental program
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Embodiment 1

[0061] In Example 1, as raw material powders, (a) silicon nitride powder (manufactured by Ube Industries, E10 grade), (b) aluminum nitride powder (manufactured by Tokuyama, F grade), (c) calcium carbonate powder (Kanto Chemical manufacture, special grade reagent), (d) europium oxide powder (manufactured by Shin-Etsu Chemical Industry, RU grade) to prepare α-Sialon powder. The mixing ratio is set to (a) silicon nitride (Si 3 N 4 ): (b) aluminum nitride (AlN): (c) calcium carbonate (CaCO 3 ): (d) europium oxide (Eu 2 o 3 )=52.3:36.2:10.9:0.6 (molar ratio), in an ethanol solvent, carry out 1 hour of wet ball milling with a silicon nitride pot and ball, filter, and dry to obtain a mixed powder.

[0062] 25 g of the mixed powder was filled into a boron nitride crucible with an inner diameter of 50 mm and a height of 40 mm, and lightly tapped. At this time, the bulk density of the mixed powder calculated from the filling height is 0.45g / cm 3 . A cap made of boron nitride was ...

Embodiment 2

[0066] In embodiment 2, the internal diameter of 25g of the same mixed powder raw material as in embodiment 1 is carried out under the pressure of 20MPa under the mold of 40mm to carry out uniaxial compression molding, and the obtained bulk density is 1.2g / cm 3 of shaped objects. This molded product was placed in the same crucible as in Example 1, and heat-treated under the same conditions. The bulk density of the molded product after heat treatment becomes 1.4g / cm 3 , slightly densified compared with that before heat treatment. Then, in the same manner as in Example 1, it was ground in a mortar so that it could pass through a sieve with a mesh size of 45 μm to obtain a synthetic powder. The pulverization of the product of Example 2 is slightly worse than that of Example 1.

[0067] According to the XRD measurement, it can be seen that the crystal phase of the product of Example 2 is a single phase of α-Sialon. According to the particle size distribution measurement of the...

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Abstract

An +--sialon which is represented by general formula: (M1)x (M2) Y (Si, Al) 12 (O, N) 16 (wherein M1 represents one or more elements selected from the group which consists of Li, Mg, Ca, Y and lanthanoid (except La and Ce) and M2 represents one or more elements selected from the group which consists of Ce, Pr, Eu, Tb, Yb and Er and wherein 0.3 < X + Y < 1.5 and 0 < Y < 0.7) is synthesized by loading a container with a mixed powdery material of silicon nitride, aluminum nitride, an M1 containing compound and an M2 containing compound and at need aluminum oxide so that its bulk density is not more than 1.5 g / cm 3 , heat-treating the mixed powdery material at 1,600 to 2,000 DEG C in a nitrogen atmosphere. The +--sialon is pulverized to make an +--sialon powder, which can be utilized as a phosphor material for a while LED which uses a blue or an ultraviolet LED as its light source.

Description

technical field [0001] The present invention relates to α-Sialon powder and its manufacturing method. The α-Sialon powder can be used for phosphors and the like of white light-emitting diodes with blue light-emitting diodes or ultraviolet light-emitting diodes as light sources. Background technique [0002] α-sialon (Si-Al-O-N), which is a solid solution of α-silicon nitride, is used for sliding parts and high-temperature applications due to its high hardness, excellent wear resistance, high-temperature strength and oxidation resistance. Structural components and other uses. [0003] This α-type Sialon has the following structure: specific elements (Ca and Li, Mg, Y or lanthanide metals other than La and Ce) are inserted and solid-solved between the lattices. In order to maintain electrical neutrality, Si-N The bonds are partially replaced by Al-N bonds (a part may also be replaced by Al-O bonds). In recent years, it has been found that by properly selecting such intercala...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082C09K11/08C09K11/80H01L33/00C09K11/64
CPCC01B21/0826C09K11/0883C04B2235/3206C04B2235/3865C04B35/597C04B2235/3229C04B2235/3217C04B2235/3873C04B2235/3208C01P2004/61C04B2235/5481C04B2235/9646C01P2002/84C04B2235/442C04B2235/608C04B2235/3203C04B2235/3224C04B35/6262C04B2235/766C01P2004/52C04B2235/3225C01B21/0821C09K11/7734C09K11/77348
Inventor 三友护广崎尚登江本秀幸伊吹山正浩
Owner NAT INST FOR MATERIALS SCI
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