Low-melting-point corrosion-resistant nickel-based eutectic brazing material and application thereof

Abstract

The invention discloses a low-melting-point corrosion-resistant nickel-based eutectic brazing material and application thereof. The low-melting-point corrosion-resistant nickel-based eutectic brazingmaterial comprises the following components in percentage by mass: 10-14wt% of chromium, 8-12wt% of phosphorus, 9-11wt% of copper, 0.5-2wt% of tin, 0.08-0.12wt% of silicon and the rest of nickel and unavoidable impurities. The invention also discloses the application of the low-melting-point corrosion-resistant nickel-based eutectic brazing material in the field of stainless steel material or purecopper welding. The alloying functions of chromium, copper, silicon and phosphorus in nickel are utilized, the content of chromium, copper, silicon and phosphorus is controlled precisely to obtain eutectic composition, and thus the nickel-based eutectic brazing material with a lower melting point, corrosion resistance, high temperature resistance, high welding strength and high wettability is obtained and is especially suitable for brazing of stainless steel electric heating pipes, stainless steel watches, stainless steel jewelries and pure copper parts.

Description

technical field [0001] The invention relates to a brazing material, in particular to a low-melting-point corrosion-resistant nickel-based eutectic brazing material and its application, belonging to the field of welding technology. Background technique [0002] In the prior art, the brazing of stainless steel parts such as electric heating tubes is usually completed by continuous brazing under a hydrogen protective atmosphere. In order to obtain excellent welding tightness and long product life, the brazing filler metal used is mostly low-temperature eutectic nickel base solder. This is because the solid phase directly changes into the liquid phase during the melting process of the eutectic solder, and there is no solid-liquid coexistence phenomenon, so it has optimal fluidity, which can quickly fill the gap and ensure the sealing of the product. At the same time, low-temperature brazing can avoid the grain growth of the base metal to the greatest extent, and increase the se...

AI Technical Summary

Problems solved by technology

However, the components of these publicly reported solders are all non-eutectic components. The solder must go through the solid-liquid coexistence zone during the melting process. The existence of the solid phase will affect the solder fluidity and seam filling performance, and cannot meet the requirements of stainless steel with high sealing requirements. Brazing requirements for parts

In addition, the melting point of the related nickel-based alloys reported publicly is still higher than that of the BNi-7 alloy, which cannot meet the needs of the low-temperature brazing industry