A kind of solder for vacuum brazing high nitrogen steel and preparation method thereof

Abstract

The invention discloses brazing filler metal for vacuum brazing of high-nitrogen steel. The brazing filler metal for vacuum brazing of the high-nitrogen steel is composed of, by weight, 25-28 parts ofPd, 39-46 parts of Ni, 36-39 parts of Cr, 2.8-5.8 parts of vanadium plated nickel graphene, 12-15 parts of Mn, 7-11 parts of Re, 6-9 parts of Si and 2-5.5 parts of B. During preparation, a method comprises the following steps that firstly, distilled water, a water-based binding agent, acetone and ethyl alcohol are weighed, raw material alloy powder of the Pd, the Ni, the Cr, the vanadium plated nickel graphene, the Mn, the Re, the Si and the B is prepared according to the proportion and is ground to 106 micons-150 microns to be used; secondly, the acetone, the ethyl alcohol, the water-based binding agent and the distilled water which are obtained in the first step are arranged in a beaker and stirred, and a solution without sediment is obtained; and thirdly, 45-70 parts of the raw material alloy powder obtained in the first step is taken, 12-18 parts of an auxiliary additive is added into the 45-70 parts of the raw material alloy powder, a mixture is added into the solution obtained in the second step, stirring and vacuumizing are carried out, and the pasty brazing filler metal is prepared. According to the brazing filler metal, during brazing, the defect that in traditional welding, air holes are prone to being generated is overcome, the element of nitrogen is almost not lost, and the structure homogeneity of the high-nitrogen steel base metal is guaranteed.

Description

technical field [0001] The invention relates to the technical field of high-nitrogen steel welding, in particular to a solder used for vacuum brazing high-nitrogen steel and a preparation method thereof. Background technique [0002] High-nitrogen steel has the advantages of corrosion resistance, oxidation resistance, wear resistance and excellent mechanical properties. It is one of the important materials for the manufacture of aviation, ships and weapons. The welding technology of high-nitrogen steel is an important process that determines its application scope. link. At present, high-nitrogen steel welding technology is mainly based on friction welding, friction stir welding, TIG welding, MIG welding, explosive welding, gas shielded welding, laser and its hybrid welding. The nitrogen content of the steel itself is high, and the welding porosity problem caused by the nitrogen precipitation of the base metal often occurs during the welding process, which in turn induces th...

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Problems solved by technology

However, the vacuum brazing method is introduced into high-nitrogen steel welding (that is, the welding of high-nitrogen steel and high-nitrogen steel), especially for the self-made high-nitrogen steel of 1Cr26Mn22N (composed of 0.9-2.1 parts N, 51-65 parts Fe, 1.9 -2.7 parts of Ni, 23-28 parts of Cr, 19-25 parts of Mn, 1.2-1.6 parts of Mo, 0.2-0.6 parts of C, 0.02-0.05 parts of S, 0.05-0.08 parts of P and 0.5-0.8 parts of Si (by weight ) composition), because the existing brazing material cannot avoid the precipitation of nitrogen in high nitrogen steel on the one hand, and cannot ensure the uniformity of the structure of the high nitrogen steel base metal connection, on the other hand, due to the nitrogen in the brazing process Precipitation is easy to produce pores, which cannot guarantee the connection strength and service life of high nitrogen steel

At present, there is no data report on brazing filler metals for brazing high nitrogen steel

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