F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
F01D 25/24 (2006.01) F02K 1/80 (2006.01)
Patent
CA 2680117
According to the invention, in order to assemble two parts (154, 162) made of materials having different thermal expansion coefficients at their edge portions (154a, 162a) and engaged with each other, the method comprises forming along the thinned edge of one of the parts tabs (170) separated by slots (172) and obtained by cutting or machining the material of the part, and assembling the parts by attaching them (174) to the tabs. The edge portions are mutually engaged in order to be brought into mutual substantially tight contact at the high temperatures achieved during operation. The invention can particularly be used for assembling parts respectively made of a metal and a ceramic-matrix composite material, in particular in an aircraft gas turbine such as the upstream and downstream secondary nozzles.
Pour assembler deux pièces (154, 162) en des matériaux ayant des coefficients de dilatation différents au niveau de parties de bord (154a, 162a ) engagées l une avec l autre, on forme le long du bord aminci de l une des pièces des languettes (170) séparées par des fentes (172) et obtenues par découpe ou usinage du matériau de la pièce et on assemble les pièces par fixation (174) au niveau de languettes. Les parties de bord sont engagées mutuellement de manière à être en contact mutuel sensiblement étanche aux températures élevées rencontrées en service. L'invention est notamment applicable à l assemblage de pièces respectivement en métal et en matériau composite à matrice céramique, en particulier dans une turbine à gaz aéronautique, par exemple tuyères secondaires amont et aval.
Sim & Mcburney
Snecma Propulsion Solide
LandOfFree
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