Method for producing by laser gastight and high-temerature...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 37/00 (2006.01) B23K 1/005 (2006.01) C04B 35/505 (2006.01) C04B 35/565 (2006.01) C04B 35/653 (2006.01)

Patent

CA 2501802

The invention concerns the fields of ceramics and laser technology and relates to a method, with which, for example, low-melting-point or radioactive materials can be enclosed inside a container made of a ceramic material. The aim of the invention is to produce a durable, gas-tight and high-temperature resistant union between parts made of a non-oxidic ceramic material. To this end, the invention provides a method in which shaped parts made of the ceramic material are provided, on their surfaces to be joined, with a solder consisting of 80 - 30 % by mass of yttrium oxide and/or 55 - 15 % by mass of zirconium oxide, 5 - 70 % by mass of aluminum oxide, 0 - 50 % by mass of silicon dioxide, and 0 - 10 % by mass of silicon. Afterwards, a laser serves to increase the temperature at the joining location to a temperature that exceeds the melting temperature of the solder without the presence of a protective gas atmosphere or a vacuum.

L'invention a trait au domaine des céramiques et de la technologie laser et concerne un procédé permettant par exemple d'intégrer des matériaux à bas point de fusion ou des matériaux radioactifs dans un contenant en céramique. L'objectif de cette invention est de produire une liaison durable, étanche aux gaz et résistante aux températures élevées entre des composants en céramique non oxydante. A cet effet, le procédé selon l'invention consiste à : recouvrir les surfaces de pièces moulées en céramique destinées à être assemblées, d'une brasure comprenant 80 à 30 % en masse d'oxyde d'yttrium et/ou 55 à 15 % en masse d'oxyde de zirconium, 5 à 70 % en masse d'oxyde d'aluminium, 0 à 50 % en masse d'oxyde de silicium et 0 à 10 % en masse de silicium ; puis à augmenter la température régnant au niveau du point d'assemblage de façon qu'elle dépasse la température de fusion de la brasure, au moyen d'un laser mais sans atmosphère gazeuse protectrice, ni vide.

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