CN110711972A - Nickel-core chemical-coating brazing material - Google Patents
Nickel-core chemical-coating brazing material Download PDFInfo
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- CN110711972A CN110711972A CN201910992621.5A CN201910992621A CN110711972A CN 110711972 A CN110711972 A CN 110711972A CN 201910992621 A CN201910992621 A CN 201910992621A CN 110711972 A CN110711972 A CN 110711972A
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- brazing
- nickel
- pure nickel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
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.
Description
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.
Example 1:
selecting BNi-2 brazing alloy (BNi85.4Cr7Si4.5B3.1Fe3), taking pure nickel wires with the diameter of 1.0mm and the length of 11 meters and provided with grooves on the surface, weighing 70 g of the nickel wires, wherein the total mass of the brazing alloy is 82 g because the percentage of Ni is 85.4%, calculating the mass percentages of other elements Cr, Si, B and Fe in the brazing alloy according to the mass percentages of all elements of the brazing alloy to be 12 g totally, and if the mass percentage of WC is 15%, the mass percentage of a brazing flux is 6%, and the percentage of a binder is 5%, the mass percentage of the brazing alloy in the whole coating material is (100-15-6-5) = 74%. Calculating the quality of the whole coating layer by the total mass and the mass percentage of the brazing alloy, thereby calculating the quality of WC, the quality of a brazing flux and the quality of a binder, wherein WC particles are cast tungsten carbide powder of 20-30 meshes, and the brazing flux is borax: calcium fluoride = 90: 10 of a brazing flux.
The brazing filler metal powder Cr, Si, B, Fe, WC particles, brazing flux and binder are prepared into suspension slurry, the suspension slurry is placed in a powder coating cylinder of press coating equipment for standby, pure nickel wires or pure nickel strips with the diameter of 1.0mm and the length of 11 m enter a hydraulic cylinder through a wire feeding mechanism and enter the powder coating cylinder, the suspension slurry is uniformly coated on the surfaces of the pure nickel wires or the pure nickel strips through the press coating equipment to form a chemical coating layer, and the chemical coating layer is dried through a tunnel furnace and enters a winding device to prepare the nickel-core chemical coating brazing material.
The base material was Q235 carbon steel, and the product of this example was subjected to an abrasive wear test performed on an MLG-130A dry rubber wheel abrasive wear tester. The dimensions after brazing were 57 mm. times.25.5 mm. times.6 mm. The test load is 20N, the abrasive is 120-type brown corundum, the rotating speed of the rubber wheel is 100r/min, the sand flow is 100g/min, the abrasion time is 15min, the abrasion of the coating is expressed by weight loss, and the test result is 38 mg. The test result of the traditional suspension slurry brazing material prepared by adopting BNi-2 brazing filler metal powder, cast tungsten carbide powder and the like in the same proportion in the same brazing process and the abrasive particle abrasion test is 45mg, and the abrasion resistance of the brazing material is obviously higher than that of the traditional powder brazing material.
Example 2:
BNi-2 brazing alloy (BNi85.4Cr7Si4.5B3.1Fe3) is selected, pure nickel wires with the diameter of 2.0mm and the length of 103 m and provided with grooves are taken, the weight of the nickel wires is about 2796 g, and the total weight of the brazing filler metal is 3274 g because the percentage of Ni is 85.4%. The mass fraction of other elements Cr, Si, B and Fe in the brazing filler metal is calculated to be about 478 g. If the WC accounts for 20% by mass, the brazing flux accounts for 6% by mass, and the binder accounts for 5% by mass, the brazing filler metal accounts for (100-20-6-5) =69% by mass of the whole coating material. The quality of the whole coating brazing material is calculated according to the total mass and the mass percentage of the brazing filler metal, so that the quality of WC, the quality of the brazing flux and the quality of the binder are calculated. Selecting 20-30 meshes of cast tungsten carbide powder as WC particles, wherein the soldering flux is borax: calcium fluoride = 90: 10 of a brazing flux.
Firstly, preparing the brazing filler metal powder Cr, Si, B, Fe and WC particles, brazing flux and binder into suspension slurry, and placing the suspension slurry into a powder coating cylinder of press coating equipment for later use; pure nickel wires or pure nickel strips with the diameter of 2.0mm and the length of 103 m enter a hydraulic cylinder and enter a powder coating cylinder through a wire feeding mechanism, suspension slurry is uniformly coated on the surfaces of the pure nickel wires or the pure nickel strips by using press coating equipment to form a chemical coat layer, and the chemical coat layer is dried by a tunnel furnace and enters a winding device to prepare the nickel-core chemical coat brazing material.
The base material was Q235 carbon steel, and the product of this example was subjected to an abrasive wear test performed on an MLG-130A dry rubber wheel abrasive wear tester. The dimensions after brazing were 57 mm. times.25.5 mm. times.6 mm. The test load is 20N, the abrasive is 120-type brown corundum, the rotating speed of the rubber wheel is 100r/min, the sand flow is 100g/min, the abrasion time is 15min, the abrasion of the coating is expressed by weight loss, and the test result is 36.4 mg. The traditional suspension slurry brazing material prepared by adopting BNi-2 brazing filler metal powder, cast tungsten carbide powder and the like in the same proportion has the abrasion resistance obviously higher than that of the traditional powdery brazing material by adopting the same brazing process and the test result in an abrasive wear test of 44 mg.
Example 3:
BNi-2 brazing alloy (BNi85.4Cr7Si4.5B3.1Fe3) is selected, pure nickel wires with the diameter of 3.0mm and the length of 105 m and provided with grooves on the surface are taken, the weight of the nickel wires is weighed to be about 6291 g, the weight percentage of all the elements of the brazing filler metal powder Cr, Si, B and Fe is calculated, about 1075.5 g in total, and the total weight of the brazing filler is 7366.5 g. If the WC accounts for 25% by mass, the brazing flux accounts for 6% by mass and the binder accounts for 5% by mass, the brazing filler metal accounts for (100-25-6-5) =64% by mass of the whole coating material. The quality of the whole coating brazing material is calculated according to the total mass and the mass percentage of the brazing filler metal, so that the quality of WC, the quality of the brazing flux and the quality of the binder are calculated. WC particles are cast tungsten carbide powder of 20-30 meshes, and the brazing flux is borax: calcium fluoride = 90: 10 of a brazing flux.
Firstly, preparing the brazing filler metal powder Cr, Si, B, Fe and WC particles, brazing flux and binder into suspension slurry, and placing the suspension slurry into a powder coating cylinder of press coating equipment for later use; enabling a pure nickel wire or a pure nickel strip with the diameter of 3.0mm and the length of 105 meters to enter a hydraulic cylinder and 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 furnace, and then enabling the chemical coat layer to enter a winding device to prepare a nickel core chemical coat brazing material;
the base material was Q235 carbon steel, and the product of this example was subjected to an abrasive wear test performed on an MLG-130A dry rubber wheel abrasive wear tester. The dimensions after brazing were 57 mm. times.25.5 mm. times.6 mm. The test load is 20N, the abrasive is 120-type brown corundum, the rotating speed of the rubber wheel is 100r/min, the sand flow is 100g/min, the abrasion time is 15min, the abrasion of the coating is expressed by weight loss, and the test result is 35.5 mg. The traditional suspension slurry brazing material prepared by adopting BNi-2 brazing filler metal powder, cast tungsten carbide powder and the like in the same proportion has the test result of 43mg in the same brazing process and abrasive wear test, and the wear resistance of the brazing material is obviously higher than that of the traditional powdery brazing material.
While there have been shown and described what are at present considered the fundamental principles of the invention, its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
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 ℃.
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| CN111468859A (en) * | 2020-05-29 | 2020-07-31 | 自贡长城硬面材料有限公司 | Hard alloy wear-resistant flexible welding rope for steel body drill bit surfacing and preparation method thereof |
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| CN114012307A (en) * | 2022-01-10 | 2022-02-08 | 中机智能装备创新研究院(宁波)有限公司 | Braze-coated wire and preparation method thereof |
| CN114850726A (en) * | 2022-06-10 | 2022-08-05 | 郑州机械研究所有限公司 | Nickel core coating braze-coating material, preparation method thereof and braze-coating method |
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