US 12,472,574 B2
Method for joining, by direct brazing, a first part and a second part, including steps of preparing the surface of at least one of the parts
Grégory Largiller, Grenoble (FR); Philippe Emonot, Grenoble (FR); and Rayisa Voytovych, Echirolles (FR)
Assigned to COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, Paris (FR)
Appl. No. 18/260,803
Filed by COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, Paris (FR)
PCT Filed Jan. 10, 2022, PCT No. PCT/FR2022/050053
§ 371(c)(1), (2) Date Jul. 10, 2023,
PCT Pub. No. WO2022/148941, PCT Pub. Date Jul. 14, 2022.
Claims priority of application No. 2100219 (FR), filed on Jan. 11, 2021.
Prior Publication US 2024/0075546 A1, Mar. 7, 2024
Int. Cl. B23K 1/00 (2006.01); B23K 1/20 (2006.01); B23K 35/26 (2006.01); B23K 103/00 (2006.01); B23K 103/16 (2006.01); B23K 103/18 (2006.01)
CPC B23K 1/206 (2013.01) [B23K 35/262 (2013.01); B23K 2103/172 (2018.08); B23K 2103/18 (2018.08); B23K 2103/50 (2018.08)] 13 Claims
OG exemplary drawing
 
1. A method for assembling a first part and a second part by brazing, comprising the following steps:
i) preparing a first part made of carbon, a titanium-based material, a nickel- based material or a CoCr alloy according to the following sub-steps a) to d):
a) providing the first part made of carbon, titanium-based, nickel-based or made of a CoCr alloy,
b) carrying out a plasma treatment with a neutral gas, on the first part whereby the part is cleaned and an active surface is formed on the part,
c) depositing a first layer comprising an active element over the active surface of the first part, the active element being a carbide-forming element,
d) depositing a second layer made of gold over the first layer, whereby the first layer is protected from oxidation and wetting of a filler material is improved during heating;
ii) preparing a second part made of carbon, a titanium-based material, a nickel-based material or a CoCr alloy, the second part being, advantageously, prepared according to sub-steps a) to d) as defined in step i);
iii) bringing the filler material into contact with the first part and with the second part whereby an assembly is obtained;
iv) heating the assembly obtained at the step iii) up to an assembly temperature higher than the melting temperature of the filler material, so as to melt the filler material, and maintaining the assembly temperature for a hold time period, the assembly temperature being lower than 450° C.;
v) cooling the assembly so as to form a solder joint between the first part and the second part, whereby the parts are assembled.