Braze system with matched coefficients of thermal expansion

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 1/19 (2006.01) B23K 1/00 (2006.01) B32B 15/04 (2006.01) C22C 49/14 (2006.01)

Patent

CA 2627786

A CTE modified braze composition that can be utilized to manufacture a strong, gastight joint where at least one of the joining members comprises a ceramic (e.g., a ceramic or a cermet). The braze composition is formulated so as to reduce the thermal stress that results from the mismatch of thermal expansion coefficients between a ceramic joining member and the braze or other joining members. The braze composition comprises a braze alloy in powder, paste or bulk form mixed with one or more particulate or fibrous fillers that exhibit a low (i.e., no more than 6 ppm/K) or negative coefficient of thermal expansion. The braze composition can be used to join members, at least one of which comprises ceramic, and to a composite member produced by joining the two or more members.

L'invention porte sur une composition de brasage à coefficient d'expansion thermique modifié qui peut être utilisée pour fabriquer un joint étanche aux gaz solide, l'un des éléments du joint au moins comprenant une céramique (p.ex., une céramique ou un cermet). La composition de brasage de l'invention est formulée de manière qu'elle réduit la contrainte thermique consécutive à un défaut d'appariement entre les coefficients d'expansion thermique d'un élément de joint céramique et la brasure ou les autres éléments de joint. La composition de brasage de l'invention comprend un alliage de brasage en poudre, en pâte ou en vrac, mélangé à une ou plusieurs charges particulaires ou fibreuses présentant un coefficient d'expansion thermique faible ou négatif (c'est-à-dire inférieur ou égal à 6 ppm/K). La composition de brasage de l'invention peut être utilisée pour unir des éléments, dont l'un au moins comprend de la céramique, l'invention se rapportant également à un élément composite produit par l'union d'au moins deux des éléments précités.

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