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Method for coating a metal crucible member with a glass and ceramic mixture

一种混合物、坩埚的技术，应用在坩埚部件领域

Active Publication Date: 2011-10-05
ORANO RECYCLAGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However no effect on the porosity of the coating was addressed, and by reproducing these experiments the inventors were able to ascertain that there was no effect, while the microstructure of the coating was not significantly altered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] I) 1°) Anyone is therefore directed to select a glass with a glass transition temperature Tg below about 650°C, and preferably below about 500°C, for addition to the coatings described herein, which will provide a wider range, and are therefore more likely to produce beneficial results.

[0029] 2°) Then heat treatment is considered according to the following conditions.

[0030] a) The heat treatment first consists of glazing, ie intense and short heating to ensure melting of the surface or the entire volume of the coating, followed by quenching in air. To relieve thermal stress from quenching, glazing is continued and annealed at a temperature insufficient to oxidize the substrate, and typically below 550°C for a glass transition temperature of 500°C. Glazing lasts a few minutes, while annealing lasts several hours. The temperature at which glazing is performed is about 3 / 2 times the glass transition temperature, and here it may comprise about 800°C to 850°C.

[00...

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PUM

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Abstract

Angular sectors of a cylindrical wall of a crucible for vitrification of waste, built in steel and subject to high temperatures, are coated with a mixture of mainly glass and ceramic, the coating being subject to a heat treatment comprising a step between 650 DEG C. and 850 DEG C. so as to perform surface melting of the mixture filling the open porosity, improving dielectric strength and the cohesion of the coating, but without producing any excessive thermal expansion or oxidation of the substrate which would lead to fast flaking of the coating.

Description

technical field [0001] It is an object of the present invention to provide a method of coating a metal crucible, and such a crucible part. [0002] The method according to the invention is designed in particular for crucibles which are used in vitrification processes which induce high-temperature induction heating of a load in the crucible, wherein the crucible is cooled. Such crucibles are used for refining glass from oxides, incinerating low- and moderately reactive nuclear organic waste in molten glass baths, and vitrifying high-, medium- and low- reactive nuclear waste or liquid waste. The crucible is placed on a refractory concrete bottom and placed in a magnetic field generated by an inductor in which a high-frequency current flows, thereby generating heat in the crucible load. The cylindrical wall of the crucible, advantageously metal, will be subject to significant heating due to the molten load it contains and to evolutions due to the induced current it is subjected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/14C23C4/10C23C28/00
CPCC23C4/10C03C2207/04C03C8/14
Inventor P·布兰G·贝拉尔J·拉孔布
Owner ORANO RECYCLAGE