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Method for protecting precious metal crucible by coating crucible with high temperature resistant coating

A precious metal, high temperature resistant technology, applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problem of weak adsorption between the coating and the outer surface of the crucible, so as to increase the external specific surface area, increase the adsorption force, good protection effect

Active Publication Date: 2014-02-26
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

However, these methods are all directly sprayed on the outer surface of the iridium crucible, which has the problem of weak adsorption between the coating and the outer surface of the crucible.

Method used

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  • Method for protecting precious metal crucible by coating crucible with high temperature resistant coating

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Embodiment 1

[0029] 1. The melting point of LYSO:Ce crystal is about 2150°C. At present, iridium gold crucible is mostly used as the growth crucible of the crystal. The maximum working temperature of iridium is 2200°C. During the growth process of LYSO:Ce crystal, the volatilization of iridium gold causes The cost loss of the crystal growth is a major item of the crystal growth cost. In order to reduce the use loss of iridium, we firstly carry out surface treatment on the newly made iridium crucible, that is, after the surface of the iridium crucible is cleaned, in a closed glove box, Use alumina particles with a particle size of 800μm to spray the outer surface of the iridium crucible at a speed of 15-20m / s for 25 minutes to form extremely fine pits on the outer surface of the iridium crucible to increase the outer specific surface area of ​​the crucible, thereby increasing the coating and the crucible. Adsorption between external surfaces.

[0030] 2. The surface of the iridium crucible ...

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Abstract

The invention relates to a method for protecting a precious metal crucible by coating the crucible with a high temperature resistant coating. The method comprises the following steps: carrying out surface pretreatment on the precious metal crucible: blasting the outer surface of the precious metal crucible by using aluminium oxide particles at a high speed in an airtight box, so that ultrafine pits are formed on the outer surface of the precious metal crucible so as to increase the outer specific surface area of the crucible; and carrying out high-temperature plasma spraying of fine zirconium oxide sand on the pretreated outer surface of the precious metal crucible so as to form a dense zirconium oxide protective layer. According to the method, the ultrafine pits are formed on the outer surface of the precious metal crucible by carrying out high-speed fine particle blasting on the outer surface of the precious metal crucible so as to increase the outer specific surface area of the crucible, so that the adsorption capacity between the protective layer and the outer surface of the crucible is increased; and the dense zirconium oxide protective layer is formed through plasma spraying, so that the volatilization of the precious metal crucible is reduced, the using loss is reduced, and the growth cost of crystals is saved.

Description

technical field [0001] The invention relates to a protection method for a precious metal crucible, which belongs to the field of crystal growth, and more specifically belongs to the field of protection methods for the use of a precious metal crucible. Background technique [0002] Crystal materials are the basis of high-tech industries such as information, electronics, communications, and lasers. physics. With the continuous exploration of the field of crystals, more and more artificial crystals with excellent performance have been successfully developed. Most of these artificial crystals with excellent performance have high melting points, such as scintillation crystals such as lutetium silicate doped with cerium Lu 2 SiO 5 :Ce (LSO:Ce) has a melting point of about 2200°C, yttrium lutetium silicate (Lu (1-x) Y (x) ) 2 SiO 5 :Ce(LYSO:Ce) has a melting point of about 2150°C, cerium-doped lutetium aluminum garnet Lu 3 Al 5 o 12 The melting point of :Ce (LuAG:Ce) is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/10C23C4/11C23C4/134
Inventor 吴承戴灵恩唐佳陆晟丁栋舟毛日华杨建华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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