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Brazing wear-resistant composite plate and manufacturing process thereof

A manufacturing process and composite plate technology, which is applied in the field of wear-resistant plates, can solve the problems of insufficient solder infiltration, low strength, and high cost, and achieve the effects of improving brazing stress state, reducing thermal stress, and simple processing

Inactive Publication Date: 2018-12-21
烟台奥德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the difficulties in the connection technology between cemented carbide and steel plate is that the thermal expansion coefficient between cemented carbide and steel is quite different, so large thermal stress will be generated during welding, and the infiltration of the brazing filler metal to the cemented carbide is insufficient, resulting in substrate and steel. Poor fusion of wear layer
Brazing is a common method for connecting cemented carbide and steel, but the brazing method currently used results in misalignment of the joints of the composite plate, and the strength is not high, and some brazing methods use cumbersome preparation process and high cost of brazing material, which is not suitable for large-scale Production

Method used

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  • Brazing wear-resistant composite plate and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Proportion by weight 18% tin, 1.1% iron, 80.9% copper according to the above brazing material preparation steps to prepare alloy foil, then cut into 3 strips with a length of 60mm and a width of 20mm, and use sandpaper to remove surface oxides before use. Take 9 pieces of titanium carbide-steel hard alloy of 20×20×10mm and 1 piece of steel plate of 60×60×7mm, and place the titanium carbide-steel hard alloy on the steel plate after the above-mentioned brazing steps. -Steel cemented carbide and steel plate are evenly covered with brazing flux and TiC powder, assembled into a ceramic boat and placed in a vacuum furnace, heated to 760°C and kept for a period of time, cooled to 300°C at a certain cooling rate and then followed by the furnace Cool to room temperature and start the furnace to take samples. It can be seen that the weld seam of the prepared wear-resistant composite plate is neat, the measured welding rate is 93%, and the tensile strength of the weld seam is 440M...

Embodiment 2

[0024] Proportion by weight of 15% tin, 5% iron, and 80% copper is used to prepare the alloy foil according to the above-mentioned solder preparation steps, then cut to 20 mm long and 20 mm wide, and use sandpaper to remove surface oxides before use. Take a tungsten carbide-cobalt cemented carbide of 20×20×10mm and a steel plate of 20×20×7mm, and place the tungsten carbide-cobalt cemented carbide on the steel plate after being processed according to the above brazing steps, and the tungsten carbide-cobalt The cemented carbide and the steel plate are evenly covered with brazing flux and WC powder, assembled into a ceramic boat and placed in a vacuum furnace, heated to 760°C and kept for a period of time, then cooled to 300°C at a certain cooling rate and then cooled with the furnace to Sampling at room temperature. It can be seen that the weld seam of the prepared wear-resistant composite plate is neat, the measured welding rate is 94%, and the tensile strength of the weld seam...

Embodiment 3

[0026] Using conventional copper-based brazing material, the ratio of 38% zinc, 58% copper, and 4% manganese by weight percentage is used to prepare alloy foil according to the above-mentioned brazing material preparation steps, and then cut into 3 strips of 60mm long and 20mm wide, and use sandpaper Grinding to remove surface oxides for later use. Take 9 pieces of tungsten carbide-cobalt cemented carbide of 20×20×10mm and 1 piece of steel plate of 60×60×7mm. - Cobalt cemented carbide and steel plate are evenly covered with brazing flux, assembled into a ceramic boat and placed in a vacuum furnace, heated to 760°C and kept for a period of time, cooled to 300°C at a certain cooling rate and then cooled to room temperature with the furnace Open the furnace to sample. It can be seen that the weld seam of the prepared wear-resistant composite plate is neat, the measured welding rate is 55%, and the tensile strength of the weld seam is 300MPa.

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Abstract

The invention provides a brazing wear-resistant cemented carbide composite plate using copper-base filler metal and a manufacturing process thereof. The new filler metal solves the problem of poor fusion between a base plate and a wear-resistant layer of the brazing wear-resistant composite plate at present, and the costs of the filler metal and a brazing process are low, the brazing process is simple and convenient to well solve the problems of dislocation and insufficient firmness caused by brazing thermal stress, and the brazing wear-resistant composite plate can be used on cemented carbideblocks with different amounts on a steel plate according to the actual situation of use to meet the working surfaces with different sizes, the application range is wide, and mass production can be achieved. Square notches are formed in the edges of the brazing wear-resistant composite plate, tailor welding is convenient, and seamless tailor welding assembling can be carried out according to the different curved face and surface shapes when in use. The invention further relates to a method for uniformly sprinkling tungsten carbide powder, or titanium carbide or chromium carbide and other carbide powder between cemented carbide and steel. The thermal stress can be effectively reduced, the brazing firmness can be improved, and dislocation of brazing can be prevented by adding the tungsten carbide powder and the other carbide powder between the cemented carbide and the steel.

Description

technical field [0001] The invention relates to the technical field of wear-resistant plates, in particular to a wear-resistant composite plate brazed with hard alloy and its manufacturing technology. Background technique [0002] Cemented carbide has excellent properties such as high hardness, high strength, wear resistance, and corrosion resistance, and can be used to make wear-resistant plates. However, the price of cemented carbide is high, and the bending strength and impact toughness are mostly poor. Due to the limitation of the manufacturing process, the size of cemented carbide is small when sintered. When dealing with larger wear-resistant surfaces, it is often necessary to reduce the size The cemented carbide is welded into large-size cemented carbide for use. However, the welding effect of cemented carbide and cemented carbide is poor, and good use effect can be achieved by welding cemented carbide with steel with good toughness, high strength, excellent processi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/19B23K35/30
CPCB23K1/00B23K1/19B23K35/302
Inventor 吴长龙贺楠
Owner 烟台奥德新材料有限公司
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