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Aluminum nitride sintered body

a technology of nitride and sintered body, which is applied in the field of new materials, can solve the problems of increasing heat generation, insufficient resistance, and material problems of light transmitting members such as covers applied to light sources, and achieve excellent optical properties and high thermal conduction properties

Inactive Publication Date: 2008-03-27
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]According to the present invention, an aluminum nitride sintered body having resistance to plasma gas and high thermal conduction properties and having excellent optical properties is provided. Such an aluminum nitride sintered body is promising as, for example, a material of a high-luminance discharge lamp arc tube.

Problems solved by technology

Enhancement of luminance of light sources, however, increases heat generated, so that in the light sources of high luminous efficiency, materials of light transmitting members such as covers applied to the light sources become problems.
That is to say, although the alumina material has resistance to halogen gas, the resistance is still insufficient.
Moreover, because of low thermal conductivity of 30 W / mK, heat dissipation of a light source becomes insufficient, and therefore, there is a fear that the life of the light source is shortened.
Further, there is another problem of poor color rendering properties because the temperature of an arc tube surface becomes ununiform.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069]In a nylon pot having an internal volume of 2.4 liters, nylon balls whose iron cores had been coated with nylon and each of which had a diameter of 15 mm (surface hardness: not more than 100 kgf / mm2, density: 3.5 g / cm3) were placed, then 100 parts by weight of an aluminum nitride powder having an average particle diameter of 1.3 μm, a specific surface area of 3.39 m2 / g, an oxygen concentration of 0.8 wt % and a metallic element concentration of 35 ppm, 2 parts of a calcium aluminate compound (Ca3Al2O6) having an average particle diameter of 1.8 μm and a specific surface area of 3.75 m2 / g as a sintering additive powder and 40 parts by weight of ethanol as a solvent were added, and they were mixed by a wet process. In this mixing operation, the nylon balls occupied 40% (apparent volume) of the internal volume of the pot. The mixing was carried out for 3 hours by rotating the pot at a rotational speed of 70 rpm. The resulting slurry was dried to obtain an aluminum nitride powder....

example 2

[0072]The same procedure as in Example 1 was repeated except that the amount of the sintering additive was changed to 3 parts. The conditions for producing the aluminum nitride sintered body and the properties of the resulting aluminum nitride sintered body are set forth in Table 1.

example 3

[0073]The same procedure as in Example 1 was repeated except that the amount of the sintering additive was changed to 5 parts. The conditions for producing the aluminum nitride sintered body and the properties of the resulting aluminum nitride sintered body are set forth in Table 1.

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Abstract

[Object] It is an object of the present invention to provide an aluminum nitride sintered body having resistance to plasma gas and high thermal conduction and having excellent optical properties.[Solution means] The aluminum nitride sintered body of the present invention is characterized in that the proportion of positrons which are annihilated within a period of 180 ps (picoseconds) in the aluminum nitride crystal, as determined in the defect analysis using a positron annihilation method, is not less than 90%, and the sintered body preferably has a thermal conductivity of not less than 200 W / mK.

Description

TECHNICAL FIELD[0001]The present invention relates to a novel aluminum nitride sintered body. More particularly, the invention relates to an aluminum nitride sintered body which has excellent light transmission properties and can be preferably used particularly as a translucent cover for a light source of high luminous efficiency.BACKGROUND ART[0002]As light transmitting materials, materials that are transparent to visible light, such as transparent resin, glass, quartz and light transmitting alumina, have been heretofore properly used according to the use environment, cost, etc. For example, as a cover (window material) for a light source of low energy intensity or as a light transmitting material by which light of wavelength rather including no ultraviolet light is transmitted, a transparent resin or a glass is used. As a translucent cover for a light source rather including ultraviolet light or a light source having high energy intensity and thereby having a high temperature when...

Claims

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Application Information

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IPC IPC(8): C04B35/581
CPCC04B35/581C04B2235/9653C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3222C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/3865C04B2235/3895C04B2235/445C04B2235/446C04B2235/5409C04B2235/5436C04B2235/652C04B2235/6587C04B2235/662C04B2235/9615C04B2235/9623C04B35/6261
Inventor KANECHIKA, YUKIHIROAZUMA, MASANOBU
Owner TOKUYAMA CORP