Preparation method of oily paste forming body used for preparing pasty XHBNI-5 nickel-based brazing filler metal

Abstract

The invention relates to the technical field of welding, and aims to provide a preparation method of an oily paste forming body used for preparing pasty XHBNI-5 nickel-based brazing filler metal. Thepreparation method comprises the steps that ethyl cellulose, polymethyl methacrylate resin and polymethyl butyl acrylate resin are added into a mixer, and the mixture of the ethyl cellulose, polymethyl methacrylate resin and polymethyl butyl acrylate resin is fully mixed and then cooled to the room temperature so as to obtain a mixture I; and D100 dearomatization solvent oil is heated to 60 DEG C,and then 12-hydroxyl stearic acid is added for fully stirring until the 12-hydroxyl stearic acid is completely dissolved to obtain a mixture II; the mixture I is added into the mixture II and heatedto 80 DEG C, the mixture of the mixture I and the mixture II is fully stirring until the mixture is completely uniform, and a mixture III is obtained; and polyisobutylene succinimide and oleic acid are added into the mixture III, the mixture of the mixture III, polyisobutylene succinimide and the oleic acid are heated to 80 DEG C for stirring for 1 hour until the being completely uniform, and theoily paste forming body used for preparing the pasty XHBNI-5 nickel-based brazing filler metal is obtained. According to the preparation method of the oily paste forming body used for preparing the pasty XHBNI-5 nickel-based brazing filler metal, the paste forming body solves the problem of moisture returning caused by storage in a high-humidity environment of the pasty brazing filler metal afterthe pasty brazing filler metal is coated and dried is solved, and free of residue after the pasty brazing filler metal is subjected to vacuum brazing can be realized.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for preparing an oily paste used for preparing paste-like XHBNi-5 nickel-based solder. Background technique [0002] XHBNi-5 (NiCr29P6Si4) is a new type of nickel-based solder. Compared with BNi-5, it has the characteristics of low brazing temperature, good corrosion resistance of brazed joints, good fluidity and joint filling. It is gradually being used in many fields. Replace BNi-5 as brazing material. However, when XHBNi-5 nickel-based solder powder is formed into powder for vacuum brazing, under high vacuum conditions (vacuum degree not less than 1×10 -2 Pa), a large amount of nickel and chromium oxides will still be formed, resulting in brazing failure. Therefore, the role of the paste for the XHBNi-5 nickel-based solder powder is not only a simple carrier, but must have a high temperature vacuum brazing Reduce the oxidation of nickel-based solder after welding. ...

AI Technical Summary

Problems solved by technology

However, when XHBNi-5 nickel-based solder powder is formed into powder for vacuum brazing, under high vacuum conditions (vacuum degree not less than 1×10 -2 Pa), a large amount of nickel and chromium oxides will still be formed, resulting in brazing failure. Therefore, the role of the paste for the XHBNi-5 nickel-based solder powder is not only a simple carrier, but must have a high temperature vacuum brazing The effect of reducing the oxidation of nickel-based solder after welding

[0003] Due to the requirements of environmental protection and non-toxicity, water-based paste is mixed with solder powder to prepare paste solder in large quantities at present. However, water-based paste often contains a large amount of water-soluble components. In the field of timely welding, there is a risk of moisture absorption during storage. After moisture absorption, the paste solder that has been dried and solidified will return to a wet state, and it is easy to flow under the action of external force or gravity or capillary action, forming an uneven paste. Solder smear layer, resulting in the need to re-clean the surface to be soldered and then re-apply paste solder and dry and solidify, and this operation greatly reduces production efficiency, therefore, oil-based paste can be used as a supplement to water-based paste. Effectively improves the storage characteristics of solder paste in high humidity environment after application and drying

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