Brazing wire for ultrahigh-temperature wear-resistant coating of titanium alloy and preparation method of brazing wire

Abstract

The invention provides a brazing wire for an ultrahigh-temperature wear-resistant coating of a titanium alloy. The brazing wire comprises a tubular brazing filler metal strip layer for the titanium alloy and Co coated Cr2O3 composite particles with which the brazing filler metal strip layer for the titanium alloy is filled. The proportion of the Co coated Cr2O3 composite particles in the brazing wire for the ultrahigh-temperature wear-resistant coating of the titanium alloy ranges from 31% to 41.7%. The brazing filler metal strip layer for the titanium alloy comprises, by mass percent, 10%-13%of Ni, 1.1%-1.4% of Ag, 0.6%-0.9% of Mn, 0.4%-0.5% of La, 1.3%-2.93% of Sn, 1.6%-1.8% of Nd and the balance Cu. The invention further provides a method for preparing the brazing wire for the ultrahigh-temperature wear-resistant coating of the titanium alloy. By means of the brazing wire, the wettability and the bonding strength between a brazing layer and a titanium alloy matrix can be improved.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to a brazing wire for a titanium alloy ultra-high temperature wear-resistant coating and a preparation method thereof. Background technique [0002] At present, titanium and titanium alloys are widely used in industrial production and social life. Due to their small specific gravity, high strength, good corrosion resistance and biocompatibility, titanium and titanium alloys are widely used in aerospace, chemical industry, biomedicine and civil life. The important roles in other fields are different and replaced. Especially in the application in the field of aerospace, in order to improve the high temperature and wear resistance of the spacecraft surface, it is necessary to install a layer of ultra high temperature wear resistant coating on the surface of titanium and titanium alloy. [0003] Common methods for forming ultra-high temperature wear-resistant coatings on the ...

AI Technical Summary

Problems solved by technology

Among them, the thickness of the ultra-high temperature wear-resistant coating formed by physical vapor deposition and chemical vapor deposition is usually relatively thin; the ultra-high temperature wear-resistant coating formed by plasma spraying and flame spraying can generally only reach a thickness of about 0.5 mm; and Although the surfacing welding method can form a thicker wear-resistant coating, the heating temperature is higher, and the coating and the titanium alloy substrate are prone to thermal stress; although the brazing method can obtain a relatively large thickness range at a lower welding temperature Coating, but because titanium is a highly chemically active metal, brazing is more difficult, it needs to be brazed under the protection of vacuum or inert gas, and the silver-based, palladium-based, titanium-based or aluminum-based solder used for brazing Among them, due to the high price of palladium and silver, and the titanium-based brazing material itself is relatively brittle, the processing performance is poor, and the aluminum-based brazing material has low brazing strength, so it can only be used in working conditions that do not require high strength.