High-temperature zirconium-based solder for brazing tungsten-copper alloy and stainless steel and its preparation and brazing method

Abstract

The invention discloses high-temperature Zr-based brazing filler metal for brazing of W-Cu alloy and stainless steel, as well as a preparation method and a welding method. The high-temperature Zr-based brazing filler metal comprises the following elements by weight: 10 to 12 percent of V, 3.0 to 9.0 percent of Nb, 3.0 to 4.0 percent of Si, 8.0 to 16 percent of Cu, 9.0 to 12 percent of Ni, 11 to 14 percent of Cr, 3.0 to 5.0 percent of Sn, and the balance of Zr. The brazing temperature of the brazing filler metal is 1010 to 1090 DEG C and moderate, so that the brazing filler metal is uniformly melted; tinsel made of the brazing filler metal can accelerate atomic diffusion and interface reaction in a high-temperature connection process, so that the wetting and spreading capabilities of the brazing filler metal are improved, the residual stress in a joint is reduced, and the mechanical property of the joint is improved. Through the adoption of the preparation method of the brazing filler metal, the preparation of the brazing filler metal can be reproduced repeatedly, so as to facilitate popularization and application; through the adoption of the brazing technology provided by the invention, sample pieces are connected through vacuum brazing, wherein the sample pieces are in a vacuum atmosphere while being heated, so that problems such as oxidation and pollution are solved, the surface wetting and spreading capabilities are relatively high, convenience is brought for filling of a brazing seam, the strength of the joint is improved, and the obtained welded joint can be stable and reliable.

Description

technical field [0001] The invention relates to a solder for connecting dissimilar materials, in particular to a zirconium-based high-temperature solder for brazing tungsten-copper alloy and stainless steel, a preparation method and a brazing process, and belongs to the field of welding technology. Background technique [0002] Tungsten-copper alloy material is compatible with the excellent performance of tungsten element and the same element, not only has high thermal conductivity and low thermal expansion coefficient, but also shows good high-temperature strength, thermal shock resistance, ablation resistance and dimensional stability, etc. , often used as high-temperature resistant connectors, heat dissipation substrates, heat sink materials and contact materials, widely involved in electronic packaging, integrated circuits, vacuum switches, processing electrodes, wireless communication devices and other components; in aerospace and national defense military fields, It ca...

AI Technical Summary

Problems solved by technology

[0005] Patent No.: 201210158935.3 (a tungsten-copper alloy and stainless steel brazing filler metal and brazing process) introduces a tungsten-copper alloy and stainless steel brazing filler metal and a welding process, but the wetting of the brazing filler metal on the surface of tungsten-copper alloy and stainless steel Wetness and fluidity are poor; during the brazing process, element diffusion is uneven, the structure is coarse, and brittle solid solution phases and brittle compounds are prone to appear. The strength of the joint after welding can only reach about 100MPa, which seriously affects the performance of the welded joint.

In the field of modern defense, the use of this solder cannot meet the strength requirements of welded joints