Diffusion Bonding
Diffusion Bonding
(OP)
Understand that Diffusion bonding is not being used widely as an method of welding for fabrication of vessels and heat exchangers.
Currently we have a smally situation regarding the fabrication of Diffusion bonded item and hence i would like to know more on the application of diffusion bonding on various material and the parameters for diffusion bonding for various material.
Request some links that will give additional inputs.
Currently we have a smally situation regarding the fabrication of Diffusion bonded item and hence i would like to know more on the application of diffusion bonding on various material and the parameters for diffusion bonding for various material.
Request some links that will give additional inputs.





RE: Diffusion Bonding
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RE: Diffusion Bonding
The parameters tht control the diffusion bonding are ot discussed.
on "smally", It was an error.
I will be more careful next time
RE: Diffusion Bonding
materials in contact
cleanliness of surfaces
contact pressure
surface finish and flatness
temperature
time
We made some precision flow devices with intricate channels (think fluidics) that were stacked thin pieces of etched 304 stainless steel. The parts were first plated with a "strike" of copper, then loaded into a compression fixture and placed in a vacuum furnace for several hours at high temperature (over 1000 F). We also tried a hydrogen atmosphere and no copper coating, but had trouble with leakage using this approach.
There is information on diffusion bonding in the ASM metals handbooks, I believe in the joining volume.
RE: Diffusion Bonding
Looks like we are taking about same component.
Ours is an exchanger (Heat Exchanger with cross flow). Thin plates are stacked oneover the other.
The plates are etched to provide fluid channel
What coating would you sugbest on 6 Mo material and which atmosphere is best suited.
I know the temperature of the soak is 0.5* Melting point nd the the process is non pressure process.
RE: Diffusion Bonding
http://www.hydrocool.com/Files/HighEffHEX.pdf
Here are many pages of reports from NASA on diffusion bonding.
http://n
RE: Diffusion Bonding
Lastly, we had good luck with very thin foil sheets of braze alloys sandwiched between (simpler) parts. Ni/Pd and Ni/Au alloys.
RE: Diffusion Bonding
Here is another approach to getting a very thin bond line, in the order of nanometers that you may want to investigate.
http://www.rntfoil.com/technology/tech.html