阅读说明：本技术 一种镍基盘丝状钎涂材料 (Nickel-based disc wire-shaped brazing coating material ) 是由 龙伟民 张雷 黄俊兰 董显 路全彬 董博文 李文彬 周许升 于 2019-10-18 设计创作，主要内容包括：本发明提供一种镍基盘丝状钎涂材料,由多孔纯镍丝和压涂在纯镍丝孔内的粉料组成,多孔纯镍丝的原料包括镍金属粉和碳酸铵,粉料包括钎料金属粉和WC颗粒,其制备方法为：配制镍金属粉和碳酸铵,混合均匀后加工成坯件进行烧结,制得多孔坯件,将其进行挤压或拉拔,形成多孔纯镍丝,称取粉料组分,将其用水玻璃调制成团状粉料,放入压涂机料缸内,将多孔纯镍丝置于压涂机上进行压涂,纯镍丝孔外的粉料由压涂机出料模孔刮擦掉,烘干得成品,本发明以多孔纯镍丝和纯镍丝孔内金属粉原位合成镍基钎料,克服了镍基钎料难加工成丝或条的难题,降低了全部用粉状钎料的氧化,其具有高强韧性,可制成盘状或轴状,钎涂过程可实现自动化生产。(The invention provides a silk-shaped brazing material of a nickel-based plate, which consists of a porous pure nickel wire and powder pressed and coated in the pores of the pure nickel wire, wherein the raw materials of the porous pure nickel wire comprise nickel metal powder and ammonium carbonate, the powder comprises brazing filler metal powder and WC particles, and the preparation method comprises the following steps: preparing nickel metal powder and ammonium carbonate, uniformly mixing them, making them into blank, sintering to obtain porous blank, extruding or drawing to form porous pure nickel wire, weighing powder material component, making it into bulk powder material by using water glass, placing it into material cylinder of press-coating machine, placing the porous pure nickel wire on the press-coating machine and press-coating, scraping the powder material outside the pure nickel wire hole by using discharge die hole of press-coating machine, drying so as to obtain the invented product.)

1. A nickel-based disc wire-shaped brazing coating material is characterized in that: the brazing coating material is composed of a porous pure nickel wire and powder material pressed and coated in the pores of the pure nickel wire, wherein the powder material comprises the following components in parts by mass: 60-75 parts of brazing filler metal powder and 25-40 parts of WC particles, wherein the brazing filler metal powder is powder except nickel in the nickel-based brazing filler metal.

2. The wire-like brazing material for nickel-based disks according to claim 1, wherein: the raw materials of the porous pure nickel wire comprise nickel metal powder and ammonium carbonate.

3. The wire-like brazing material for nickel-based disks according to claim 1, wherein: the granularity of the brazing filler metal powder is as follows: 200 meshes to 300 meshes, and the granularity of WC is as follows: 80 meshes to 100 meshes.

4. The wire-like brazing material for nickel-based disks according to claim 2, wherein: the granularity of the ammonium carbonate is 40-60 meshes.

5. The method for preparing the wire-shaped nickel-based disc brazing material according to any one of claims 1 to 4, wherein the method comprises the following steps: the method comprises the following steps:

step one, preparing nickel metal powder and ammonium carbonate, uniformly mixing the nickel metal powder and the ammonium carbonate, processing the mixture into a blank, and sintering the blank to obtain a porous blank;

step two, extruding or drawing the porous blank prepared in the step one to form a porous pure nickel wire;

thirdly, weighing brazing filler metal powder and WC particles according to the weight, preparing the brazing filler metal powder and the WC particles into bulk powder by using a binder, and putting the bulk powder into a material cylinder of a press coater;

and step four, putting the porous pure nickel wire prepared in the step two on a press coater for press coating, scraping powder outside the pure nickel wire hole by a discharge die hole of the press coater, and drying to obtain a finished product.

6. The method for preparing the wire-shaped brazing material for the nickel-based discs according to claim 5, wherein the method comprises the following steps: the sintering process of the blank in the first step is as follows: and (2) sintering the molded blank in an inert gas protection furnace or a vacuum furnace at the sintering temperature: and (3) keeping the temperature at 850-900 ℃ for 1.5-2.5 h after the sintering temperature is reached.

7. The method for preparing the wire-shaped brazing material for the nickel-based discs according to claim 5, wherein the method comprises the following steps: and in the second step, the diameter of the porous pure nickel wire is 3.5-12.0 mm.

8. The method for preparing the wire-shaped brazing material for the nickel-based discs according to claim 5, wherein the method comprises the following steps: in the fourth step, the compacted density of the powder is 7.2-8.5.

Technical Field

The invention relates to the technical field of brazing coating materials, in particular to a nickel-based disc wire-shaped brazing coating material.

Background

The working surfaces of some parts require high wear resistance and corrosion resistance in practical application, if the parts are made of integral wear-resistant alloy or corrosion-resistant material, the cost is high, and the requirements on the aspect of integral mechanical property are often not met, a reasonable solution is to apply a layer of wear-resistant or corrosion-resistant metal or alloy on the surfaces of the parts by using a surface technology, and as for the wear-resistant layer, the common methods comprise a physical vapor deposition method, a chemical vapor deposition method, a thermal spraying method, a surfacing method and a recently developed brazing method, the thicknesses of the wear-resistant layers obtained by the former methods are limited, and the brazing method can obtain a coating with a larger thickness range;

braze coating is essentially a special braze, unlike conventional brazes where the braze coating material consists of two parts: one part is a common solder alloy, which has a relatively low melting temperature and is known as a low melting point component; the other part is hard alloy with high melting point, which is called high melting point component, theoretically, any brazing filler metal can form a low melting point component of the brazing coating material, but as a wear-resistant layer, the brazing filler metal is required to have certain hardness, the conventional brazing filler metal is a nickel-based brazing filler metal which is hard and brittle at present and has poor processability and is difficult to process into coiled or strip brazing filler metal.

Disclosure of Invention

The invention aims to solve the technical problems, provides the nickel-based disc filamentous brazing material, can solve the problem that the nickel-based brazing filler metal is difficult to process into wires or strips, realizes automatic brazing, improves brazing efficiency, and can also solve the problems of serious oxidation and poor brazing quality of slurry brazing materials.

The invention is realized by the following technical scheme:

the wire-shaped brazing material for the nickel-based plate consists of a porous pure nickel wire and powder pressed and coated in the pores of the pure nickel wire, wherein the powder comprises the following components in parts by mass: 60-75 parts of brazing filler metal powder and 25-40 parts of WC particles, wherein the brazing filler metal powder is powder except nickel in the nickel-based brazing filler metal.

Further, the raw materials of the porous pure nickel wire comprise nickel metal powder and ammonium carbonate.

Further, the granularity of the brazing filler metal powder is as follows: 200 meshes to 300 meshes, and the granularity of WC is as follows: 80 meshes to 100 meshes.

Further, the granularity of the ammonium carbonate is 40-60 meshes.

A preparation method of a nickel-based disc wire-shaped brazing material comprises the following steps:

step one, preparing nickel metal powder and ammonium carbonate, uniformly mixing the nickel metal powder and the ammonium carbonate, processing the mixture into a blank, and sintering the blank to obtain a porous blank;

step two, extruding or drawing the porous blank prepared in the step one to form a porous pure nickel wire;

thirdly, weighing brazing filler metal powder and WC particles according to the weight, preparing the brazing filler metal powder and the WC particles into bulk powder by using a binder, and putting the bulk powder into a material cylinder of a press coater;

and step four, putting the porous pure nickel wire prepared in the step two on a press coater for press coating, scraping powder outside the pure nickel wire hole by a discharge die hole of the press coater, and drying to obtain a finished product.

Further, the process of sintering the blank in the first step is as follows: and (2) sintering the molded blank in an inert gas protection furnace or a vacuum furnace at the sintering temperature: and (3) keeping the temperature at 850-900 ℃ for 1.5-2.5 h after the sintering temperature is reached.

Furthermore, the diameter of the porous pure nickel wire in the second step is 3.5-12.0 mm.

Furthermore, the powder compaction density in the fourth step is 7.2-8.5.

The invention has the beneficial effects that:

(1) the method prepares the porous pure nickel wire by utilizing the characteristic that ammonium carbonate is completely decomposed into gas at high temperature, and synthesizes the nickel-based brazing filler metal in situ by utilizing the high-temperature dissolution and melting of the porous pure nickel wire and the powder in the pores of the pure nickel wire, thereby not only overcoming the difficult problem that the traditional nickel-based brazing filler metal is difficult to process into wires or strips, but also lightening the oxidation problem of the whole powdery nickel-based brazing filler metal, and improving the brazing effect of the brazing coating material;

(2) the brazing coating material has high strength and toughness, can be rolled into a disc shape or a shaft shape, and can realize automatic production in the brazing coating process.

Drawings

FIG. 1 is a schematic structural diagram of a porous pure nickel wire according to the present invention.

Reference numerals: 1. pure nickel wire, 2, hole.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.