ALUMINA CERAMIC LID

PROBLEM TO BE SOLVED: To enhance the folding strength of an alumina ceramic lid which seals the cavity of a ceramic package. SOLUTION: An alumina ceramic lid 14 is bonded with solder 15 to the top face of a ceramic package 11 to seal its cavity 12. Primary grain of alumina, the raw material of the l...

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Hauptverfasser: NOZAKI TOSHIO, SHIGEMURA SHUJI, MINO KATSUJI
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creator NOZAKI TOSHIO
SHIGEMURA SHUJI
MINO KATSUJI
description PROBLEM TO BE SOLVED: To enhance the folding strength of an alumina ceramic lid which seals the cavity of a ceramic package. SOLUTION: An alumina ceramic lid 14 is bonded with solder 15 to the top face of a ceramic package 11 to seal its cavity 12. Primary grain of alumina, the raw material of the lid 14, is pulverized into a fine grain of 1-2 microns in a mean grain size and press-formed (after decay) to increase the contact points of the primary grain, thereby improving the sintering property. It is more treated to provide a sharp grain size distribution having D10-D90 (accumulated 10% and 90% grain sizes from the fine grain side) within ±70% of the mean grain size. Owing to this, the primary grain is roughly charged in the granular material before press-forming, thereby increasing the porosity to lower the granular material strength and improve the decay property (collapsing property) of the material. Thus, a compact and high-strength alumina sintered compact.
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SOLUTION: An alumina ceramic lid 14 is bonded with solder 15 to the top face of a ceramic package 11 to seal its cavity 12. Primary grain of alumina, the raw material of the lid 14, is pulverized into a fine grain of 1-2 microns in a mean grain size and press-formed (after decay) to increase the contact points of the primary grain, thereby improving the sintering property. It is more treated to provide a sharp grain size distribution having D10-D90 (accumulated 10% and 90% grain sizes from the fine grain side) within ±70% of the mean grain size. Owing to this, the primary grain is roughly charged in the granular material before press-forming, thereby increasing the porosity to lower the granular material strength and improve the decay property (collapsing property) of the material. 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subjects ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SEMICONDUCTOR DEVICES
SLAG
TREATMENT OF NATURAL STONE
title ALUMINA CERAMIC LID
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