Low-temperature copper-based brazing filler metal for high-temperature resistance clean steel and preparation method thereof

Abstract

The invention provides a low-temperature copper-based brazing filler metal for high-temperature resistance clean steel and a preparation method thereof. The low-temperature copper-based brazing filler metal is prepared by raw materials in percentage by weight as follows: 4-10% of Ni, 10-30% of Mn, 0.2-1.8% of Zr, 0.2-3.5% of Hf, 0-1% of W, 0-1% of Co, 0.1-0.25% of Ti, 0.02-0.2% of B, 0.8-2.0% of Ge, 0-0.5% of Li and a residual amount of Cu. According to the low-temperature copper-based brazing filler metal provided by the invention, various trace elements are added in copper, so that the using property of the brazing filler metal is improved; a melting process is protected by using gas, a high-temperature resistant quartz glass tube is inserted into molten brazing filler metal alloy after being vacuumized to be in a negative pressure state, so that filament welding strips with different diameters can be directly obtained; techniques of later-stage squeezing, drawing in a reducing manner and the like can be cancelled; the introduction amount of impurities in a production process of the brazing filler metal can be reduced; the cleanliness of the brazing filler metal is improved; the brazing filler metal does not contain an easily-volatile element Zn and can be applicable to vacuum brazing; the brazing filler metal does not contain silver and does not contain any toxic elements; and the brazing filler metal has the advantages of low cost, no pollution, good brazing property and the like.

Description

technical field [0001] The invention relates to a low-temperature copper-based solder composition which can be made into filaments or flakes for high-temperature-resistant clean steel brazing and a preparation method thereof. Background technique [0002] Impurities in steel have a great influence on the production and performance of steel, so the research on clean steel is of great significance. Now, clean steel has been widely used as a material used under harsh conditions. Research and development and production of high-quality clean steel brazing materials with good production and service performance are becoming an important direction for the development of today's welding materials industry. [0003] At present, the solders used for brazing connection of steel materials in the process of use include tin-based, silver-based, copper-based, manganese-based, nickel-based, etc. The tin-based solder has a relatively low melting point, but its strength is also relatively low...

AI Technical Summary

Problems solved by technology

[0006] However, the solder produced by the current production process has a high brazing temperature for ordinary copper-based solder, which is likely to have a certain impact on the structure of the base metal; and second, the impurity content is generally high, which cannot meet the requirements for clean steel brazing.

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