APA 12
APA 12 is used as a high temperature silver-based active braze for joining ceramics and other non-metallic components. For best results this alloy should be brazed under argon, hydrogen, or partial pressure of argon or hydrogen in a vacuum furnace. Take care not to outgas silver by brazing under deep vacuum at elevated temperatures.
Available Forms
Powder and paste
Properties
The properties of a brazed joint are dependent upon the base metal, joint design and brazing technique. For controlled atmosphere brazing or vacuum brazing the recommended radial joint clearance for silver base alloys falls within 0.000in – 0.002in (0.00mm – 0.05mm) range. For active brazing, the braze alloy shall be preplaced in locations of desired wetting.
Specs
Solidus
1580 F / 860 C
Liquidus
1673 F / 912 C
Disclaimer
The information and recommendations contained in this publication have been provided without charge & compiled from sources believed to be reliable and to represent the best information available on the subject at the time of issue. No warranty, guarantee, or representation is made by the Prince and Izant Company, Inc. as to the absolute correctness or sufficiency of any representation contained in this and other publications; Prince and Izant Company, Inc. assumes no responsibility in connection therewith; nor can it be assumed that all acceptable safety measures are contained in this (and other publications, or that other or additional measures may not be required under particular or exceptional conditions or circumstances.
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