Patent ID: 6109505
Filing Date: 2000-08-29
Classification: B22F,B23K,C23C,Y02T

Abstract:
A method of diffusion brazing parts made of a superalloy A using a filler material obtained from a brazing powder, said method comprising the following steps:(a) preparing a predetermined quantity of a superalloy powder having a composition identical to said superalloy A of said parts, and a quantity, in a weight ratio to said superalloy powder of between 0.1% and 40%, of a powder of at least one flux element selected from the group of boron and silicon;(b) mixing the powders prepared in step (a) and placing the powder mixture together with a plurality of balls into a container, then closing the container and maintaining it under a controlled atmosphere, said balls and said container being made of said superalloy A;(c) placing said container in a grinder and maintaining movement of the container for a period of from 30 seconds to 500 hours in order to incorporate the flux element onto the surface of the grains of said superalloy powder to thereby form a so-called single component powder;(d) chemically cleaning the surfaces of said parts to be brazed in a bath;(e) thermochemically treating said parts in a furnace;(f) depositing a filler on said surfaces of said parts, said filler consisting of said single-component powder obtained in step (c);(g) carrying out a thermal brazing cycle in said furnace wherein the temperature is increased in steps up to a brazing temperature of between 1050.degree. C. and 1400.degree. C. depending on the superalloy, and is then held for a time of from 15 to 30 minutes; and(h) carrying out a thermal diffusion treatment in said furnace under a controlled atmosphere for a period of between 4 and 16 hours.