Manufacturing
Brazing filler metals are pre-placed near or in the joint, preferably using a paste. The paste is composed by brazing filler metal powder mixed with a binder (water or solvent based) with powder content at about 80-90%. The binder determines the rheological properties of the paste which is chosen depending on how the paste is applied to the base material. Common applications techniques are dispensing screen printing, roller coating and spraying.
When the paste is applied to the base material the whole part is heated in a vacuum furnace (or in reducing atmosphere), the binder is burned off at about 500°C and at the brazing temperature the brazing filler metal melts and wets the surfaces of the base powder by capillary forces. When cooling down a leak free, metallurgical joint is formed.
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Brazing Paste applied
using syringes |
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Final results after high
temperature brazing |
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