Copper, nickel and manganese alloy brazing filler metal powder and preparation method thereof

Abstract

The invention discloses copper, nickel and manganese alloy brazing filler metal powder which is prepared from the following components in percent by mass: 28-30% of nickel, 27-30% of manganese, 4-6% of cobalt, 0.6-1.4% of silicon, 0.8-1.6% of ferrum, 0.1-0.3% of boron, 0.08-0.2% of phosphorus, less than 0.1% of oxygen, less than 0.05% of sulfur, less than 0.1% of carbon, less than 0.5% of total amount of other impurities and the balance copper. The invention also discloses a method of preparing the copper, nickel and manganese alloy brazing filler metal powder. The method comprises the following steps: uniformly mixing raw materials; putting the raw materials in vacuum induction melting gas atomization powder manufacturing equipment to be smelted to a mixed liquid alloy; and atomizing anddispersing the mixed liquid alloy to obtain the copper, nickel and manganese alloy brazing filler metal powder. The copper, nickel and manganese alloy brazing filler metal powder is small in difference of composition content and generation of an intermediate brittle phase is reduced. The heating and smelting processes and atomization are controlled, so that the copper, nickel and manganese alloy brazing filler metal powder which is uniform and stable in chemical component and low in impurity content is obtained.

Description

technical field [0001] The invention belongs to the technical field of brazing material preparation, and in particular relates to a copper-nickel-manganese alloy solder powder and a preparation method thereof. Background technique [0002] Thousands of parts are involved in an aircraft engine, and the number of parts to be welded is extremely large. Among them, copper-nickel-manganese alloy solder is a commonly used brazing material for various parts. [0003] Since the copper-nickel-manganese alloy solder contains eight elements, the properties of each element vary greatly, and it is easy to form an intermediate brittle phase, resulting in high brittleness of the alloy material itself, which does not have the plasticity required for rolling processing. When used in the field of brazing material, it cannot be prepared into welding wire and welding strip, so the use of brazing filler metal powder is an important way for this alloy to be used in titanium alloy welding. [000...

AI Technical Summary

Problems solved by technology

However, due to the differences in the properties of each alloy itself, the different composition requirements, the control of oxygen content, the control of impurity components, and the requirements of particle size and yield, the key process technologies and methods are very different, and the preparation technology of different alloy materials has not yet been specified. The rules can be followed, and other alloy powder making processes cannot be simply used to produce copper-nickel-manganese alloy solder

In addition, copper-nickel-manganese alloy brazing filler metals contain boron, phosphorus and other elements, which are easily burned during the smelting process, causing the composition control of alloy elements to deviate from the required value, and it is difficult to produce alloy brazing filler metals that meet the requirements.

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