阅读说明：本技术 一种镍芯药皮钎涂材料 (Nickel-core chemical-coating brazing material ) 是由 龙伟民 裴夤崟 黄俊兰 孙华为 纠永涛 丁天然 张冠星 于 2019-10-18 设计创作，主要内容包括：本发明提供一种镍芯药皮钎涂材料,其为双层结构,呈丝状或条状,包括内芯材料以及包裹在内芯材料外部的药皮层,内芯材料为表面设有若干条沟槽的纯镍丝或纯镍条,药皮层包括以下重量份数的组分：5份有机粘结剂、15~45份WC颗粒、6份钎剂、其余为钎料金属粉,其制备方法包括：将钎料金属粉、WC颗粒、钎剂以及有机粘结剂配置成悬浮浆料加入压涂设备的涂粉缸中,将纯镍丝或纯镍条经送丝机构送入涂粉缸,用压涂设备将悬浮浆料均匀涂覆在纯镍丝或纯镍条表面,形成药皮层,经隧道烘箱烘干,经收卷装置,即得镍芯药皮钎涂材料,本发明镍芯药皮钎涂材料药皮的结合强度高,且克服了镍基钎料难加工成丝或条的难题,钎涂过程中可以实现自动化生产。(The invention provides a nickel-core chemical coating brazing material which is of a double-layer structure and is in a thread shape or a strip shape, and comprises an inner core material and a chemical coating layer wrapped outside the inner core material, wherein the inner core material is a pure nickel wire or a pure nickel strip with a plurality of grooves on the surface, and the chemical coating layer comprises the following components in parts by weight of 5 parts of organic binder, 15 ~ 45 parts of WC particles, 6 parts of brazing flux and the balance of brazing filler metal powder.)

1. The nickel-core chemical-coating brazing material is characterized by being of a double-layer structure and in a filament shape or a strip shape, the double-layer structure comprises an inner core material and a chemical coating layer wrapped outside the inner core material, the inner core material is a pure nickel wire or a pure nickel strip with a plurality of grooves arranged on the surface, the grooves are uniformly arranged on the circumferential surface of the pure nickel wire or the pure nickel strip and are arranged along the length direction of the pure nickel wire or the pure nickel strip, and the chemical coating layer comprises the following components, by mass, 5 parts of an organic binder, 15 ~ 45 parts of WC (wolfram carbide) particles, 6 parts of a brazing flux and the balance brazing filler metal powder.

2. The nickel-cored flux coating material according to claim 1, wherein: the granularity of the brazing filler metal powder is 80-120 meshes, and the granularity of WC is 20-60 meshes.

3. A nickel cored flux coated material according to claim 1 or 2, wherein: the brazing filler metal powder is metal powder of other elements left after Ni elements are removed from the nickel-based brazing filler metal.

4. The nickel-cored flux coating material according to claim 1, wherein: the brazing flux is a brazing flux which comprises a mixture of borax and calcium fluoride, and the ratio of borax to calcium fluoride is 90: 10.

5. the nickel-cored flux coating material according to claim 1, wherein: the diameter of the pure nickel wire or the pure nickel strip is 0.8-6.5 mm.

6. The nickel-cored flux coating material according to claim 1, wherein: the thickness of the coating layer is 0.5-3.5 mm.

7. The method for preparing the nickel-cored charge sheath brazing material according to any one of claims 1 ~ 6, which is characterized by comprising the following steps:

preparing a pure nickel wire or a pure nickel strip with a groove on the surface;

step two, weighing the brazing filler metal powder, the WC particles, the brazing flux and the organic binder according to the weight to prepare suspension slurry for later use;

step three, adding the suspension slurry prepared in the step two into a powder coating cylinder of a press coating device for later use;

and step four, feeding the pure nickel wire or the pure nickel strip prepared in the step one into a powder coating cylinder through a wire feeding mechanism, uniformly coating the suspension slurry on the surface of the pure nickel wire or the pure nickel strip by using press coating equipment to form a chemical coat layer, drying the chemical coat layer by using a tunnel oven, and rolling the chemical coat layer by using a rolling device to obtain the nickel core chemical coat brazing material.

8. The method for preparing the nickel-core sheath brazing material according to claim 7, wherein the method comprises the following steps: the pure nickel wire or the pure nickel strip in the first step is prepared by smelting, extruding and drawing electrolytic nickel, and 3-12 hard alloy bosses are uniformly arranged on the inner wall of a die hole of the wire drawing die along the circumferential direction.

9. The method for preparing the nickel-core sheath brazing material according to claim 7, wherein the method comprises the following steps: in the fourth step, the drying temperature of the tunnel furnace is 150-200 ℃.

Technical Field

The invention relates to the technical field of braze coating materials, in particular to a nickel-core sheath braze coating material.

Background

High-performance PDC drill bits, tools, dies and wear-resistant parts are required to have high wear resistance and corrosion resistance, if parts are made of integral wear-resistant alloy or corrosion-resistant material, the cost is high, and the requirements cannot be met in the aspect of integral mechanical performance, a reasonable solution is to apply a layer of wear-resistant or corrosion-resistant metal or alloy on the surface of the part by using a surface technology, and as for a wear-resistant layer, common methods are a physical vapor deposition method (PVD), a chemical vapor deposition method (CVD), a thermal spraying method, a surfacing method and a brazing method, the physical vapor deposition method and the chemical vapor deposition method can only obtain a very thin coating, and are high in price and large in use limitation; the hot spraying coating is a mechanically occluded coating, the bonding force between the coating and a substrate is poor, the heating temperature of surface overlaying is higher, thermal stress and deformation are easily generated, the surface formability is poor, the brazing method is that the brazing coating is metallurgically bonded with a base material system, the bonding strength is much higher than that of the mechanical bonding of hot spraying, the brazing coating is lower than the heating temperature during overlaying, the changes of the thermal stress and the base material performance are smaller, the surface of the brazing coating is smooth, the construction precision is high, and the required precision can be achieved through a small amount of processing;

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 the 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 and softness, at present, the nickel-based brazing filler metal is commonly used, is hard and brittle, has poor processability and is difficult to process into wire or strip-shaped brazing filler metal. The conventional method is that nickel-based brazing filler metal is firstly made into powdery brazing filler metal, then the powdery brazing filler metal and hard alloy particles, a binder, organic matters and the like are prepared into suspended slurry brazing coating materials, and the suspended slurry brazing coating materials are coated or stuck on the surface of a workpiece, so that in order to prevent oxidation of a base metal and the powdery brazing filler metal and promote wetting and spreading of the brazing filler metal on the surfaces of the hard alloy particles and the base metal, a brazing flux is always required to be continuously added in a brazing coating process, the working efficiency is low, a large amount of waste of the brazing.

Disclosure of Invention

The nickel-core chemical sheath brazing material provided by the invention can be rolled into a disc shape or a shaft shape, and automatic production can be realized in the brazing process.

The invention is realized by the following technical scheme:

the nickel-core chemical-coating brazing material is of a double-layer structure and is in a thread shape or a strip shape, the double-layer structure comprises an inner core material and a chemical coating layer wrapping the outer portion of the inner core material, the inner core material is a pure nickel wire or a pure nickel strip with a plurality of grooves arranged on the surface, the grooves are uniformly arranged on the circumferential surface of the pure nickel wire or the pure nickel strip and are arranged along the length direction of the pure nickel wire or the pure nickel strip, and the chemical coating layer comprises the following components, by mass, 5 parts of organic binder, 15 ~ 45 parts of WC particles, 6 parts of brazing flux and the balance brazing filler metal powder.

Furthermore, the granularity of the brazing filler metal powder is 80-120 meshes, and the granularity of WC is 20-60 meshes.

Further, the brazing filler metal powder is metal powder of other elements left after Ni elements are removed from the nickel-based brazing filler metal.

Further, the brazing flux is a brazing flux, the brazing flux comprises a mixture of borax and calcium fluoride, and the ratio of borax to calcium fluoride is 90: 10.

furthermore, the diameter of the pure nickel wire or the pure nickel strip is 0.8-6.5 mm.

Furthermore, the thickness of the coating is 0.5-3.5 mm.

A preparation method of a nickel-core coating braze-coating material comprises the following specific steps:

preparing a pure nickel wire or a pure nickel strip with a groove on the surface;

step two, weighing the brazing filler metal powder, the WC particles, the brazing flux and the organic binder according to the weight to prepare suspension slurry for later use;

step three, adding the suspension slurry prepared in the step two into a powder coating cylinder of a press coating device for later use;

and step four, feeding the pure nickel wire or the pure nickel strip into a powder coating cylinder through a wire feeding mechanism, uniformly coating the suspension slurry on the surface of the pure nickel wire or the pure nickel strip by using press coating equipment to form a chemical coat layer, drying the chemical coat layer by using a tunnel oven, and rolling the chemical coat layer by using a rolling device to obtain the nickel core chemical coat brazing material.

Further, in the step one, the pure nickel wire or the pure nickel strip is prepared by smelting, extruding and drawing electrolytic nickel, and 3-12 hard alloy bosses are uniformly arranged on the inner wall of the die hole of the wire-drawing die along the circumferential direction.

Further, in the fourth step, the drying temperature of the tunnel furnace is 150-200 ℃.

The invention has the beneficial effects that:

(1) the invention overcomes the difficulty that the nickel-based brazing filler metal is difficult to be processed into wires or strips, and the nickel-based brazing filler metal is composed of pure nickel wires or pure nickel strips at the core part and a small amount of brazing filler metal powder in surface grooves, thereby reducing the oxidation of the completely used powdery brazing filler metal and promoting the wetting spreading of the brazing filler metal, WC and a base metal;

(2) the proportion of brazing filler metal and WC particles in the brazing coating material is consistent, and the brazing coating quality can be effectively ensured in the brazing coating process;

(3) the brazing coating material is provided with brazing flux, and the quantitative and automatic addition of the brazing flux can be realized in the brazing coating process;

(4) the surface of the pure nickel wire or the pure nickel strip in the brazing coating material is provided with the groove, the bonding strength with the coating is high, the brazing coating material can be rolled into a disc shape or a shaft shape, and automatic production can be realized in the brazing coating process.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

reference numerals: 1. medicine cortex layer, 2, pure nickel wire or pure nickel strip.

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.

A brazing alloy in a nickel-core flux-cored coating brazing material is any one of BNi-2, BNi-3, BN82CrSiB and BN76CrP, the brazing material is of a double-layer structure and is in a filament shape or a strip shape, the double-layer structure comprises a pure nickel wire or a pure nickel strip 2 with a plurality of grooves arranged on the surface and a flux layer 1 wrapping the outside of the pure nickel wire or the pure nickel strip, the grooves are uniformly arranged on the circumferential surface of the pure nickel wire or the pure nickel strip and are arranged along the length direction of the pure nickel wire or the pure nickel strip, the diameter of the pure nickel wire or the pure nickel strip is 0.8-6.5mm, the thickness of the flux layer is 0.5-3.5 mm, the flux layer is an elastic composite layer, the flux layer comprises the following components, by mass, 5 parts of an organic binder, 15 ~ 45 parts of WC particles, 6 parts of a borax metal powder, the granularity of the brazing filler metal powder is 80-120 meshes, the granularity is 20-60 meshes, the flux layer comprises other elements, and the flux is a calcium fluoride mixture of the brazing flux and the calcium fluoride.