There are many engineering properties for brazing filler metals, such as the wetting ability of certain metal surfaces; electrical and thermal conductivity; ability to join similar or dissimilar materials; malleability; and the ability to be fabricated in forms of sheet, wire, tubing and powder. But one critical property for brazing alloys is melting temperature. Identifying the melting characteristics of brazing alloys is necessary for developing accurate and efficient brazing procedures.
DTA is used to measure the melting profile of metals based on the principle that at any pre-set rate of heating, the temperature of the metal - while melting - stays constant. DTA records the temperature difference (ΔT) between the test sample that undergoes melting and the reference sample that remains solid at all temperatures (T) during the test. A plot of ΔT vs. T is generated showing the onset point where the test metal starts to melt (solidus) as well as the peak point where the test metal becomes completely molten (liquidus).
Pure metals and eutectic alloys melt at a single temperature, whereas all non-eutectic alloys melt over a range that exists between two known temperature points, the solidus and the liquidus. Below the solidus temperature the metal is completely solid and above the liquidus the alloy is entirely liquid. When the material lies between these two points it is comprised of both solid and liquid constituents which coexist.
Prince & Izant (P&I) uses Differential Thermal Analysis (DTA) for quality control and assurance purposes to ensure and verify that all our brazing filler metals feature consistent lot-to-lot melting characteristics. DTA is also extensively used by our engineering team for R&D projects and is a key part of P&I’s scientific instrumentation capabilities. We perform DTA measurements as a part of technical support for our customers to help in troubleshooting their brazing practices and procedures.
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