A kind of high-strength nickel-based solder containing boron and its melting method

Abstract

The invention discloses high-strength nickel-based brazing filler metal containing boron alkene. The high-strength nickel-based brazing filler metal containing the boron alkene is prepared from 60-160 parts of nickel, 16-29 parts of palladium, 6-15 parts of metalized boron alkene, 2.5-9.0 parts of rubidium, 2-16 parts of copper, 1-3.5 parts of carbon, 1.2-4.5 parts of chromium and 0.1-0.3 part of microelements in s smelting mode. A smelting method comprises the steps that the metalized boron alkene and 50-65% of nickel are smelted to prepare a nickel / boron alkene alloy material Al through a vacuum smelting furnace; then the chromium, palladium, copper and 25-30% of nickel are smelted in the vacuum smelting furnace to obtain an alloy A2; and the rubidium, microelements, carbon and the rest of nickel are smelted in the vacuum smelting furnace to obtain an alloy A3; and the alloy A2 and the alloy A3 are added in sequence after the alloy material A1 is smelted, a molten nickel-based alloy is obtained, and the silk-shaped or strip-shaped nickel-based brazing filler metal is obtained after the molten silver-based alloy is machined through a conventional method. The researched and developed nickel-based brazing filler metal containing boron alkene does not contain poisonous or harmful elements, and is environmentally friendly, moderate in smelting temperature, good in wettability and high in strength.

Description

technical field [0001] The invention relates to brazing materials, in particular to a high-strength nickel-based solder containing boron, and also relates to a melting method for the nickel-based solder. Background technique [0002] Nickel-based brazing filler metal is composed of nickel as the main body and adding elements that can lower its melting point (1452°C) and increase its thermal strength. Nickel-based brazing material has excellent corrosion resistance and heat resistance, and the brazing joint can withstand working temperatures as high as 1000 ° C. It is often used for brazing stainless steel, nickel alloys, cobalt alloys, etc. [0003] Since the nickel solder does not contain Ag, Cd, Zn or other high vapor pressure elements, that is, the vapor pressure of the nickel-based solder is very low, so it is especially suitable for brazing of vacuum systems and vacuum tubes, in honeycomb structures, thin-walled components, Widely used in large static structures, nucle...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent "nickel solder with excellent corrosion resistance" (ZL201580000285.1) discloses a nickel solder whose melting temperature is lower than 1000°C and has certain corrosion resistance to acid, but it is resistant to high temperature (higher than 1000°C), subjected to high external force (above 800 MPa), and high static structural parts for brazing, the nickel solder disclosed in this patent has great limitations

The use of boron in the field of nickel-based high-temperature solder is expected to overcome the shortcomings of the existing nickel-based alloy solder with low strength and poor high-temperature resistance, and then develop a new type of high-strength nickel-based solder

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