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A method for enhancing the strength of cemented carbide and metal welding interface

A cemented carbide, metal welding technology, applied in welding equipment, metal processing equipment, nanotechnology for materials and surface science, etc., can solve the problems of cemented carbide block falling off, poor impact resistance, poor interface strength, etc. , to achieve the effect of improving strength, improving hardness and wear resistance, and improving service life

Active Publication Date: 2021-02-02
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the poor impact resistance of hard alloy components such as large shield machines, low joint strength, and poor interface strength, the failure problems of hard alloy blocks falling off during the operation process, the present invention aims to provide a reinforced hard alloy and metal The method of welding interface strength is to add ceramic particle nano sol into the plating solution, plate the sol-metal substrate composite coating on the substrate, and then weld the substrate surface coated with the composite coating to obtain a strengthened connection The interface can improve the surface hardness and wear resistance of the base material at the same time, and it is used for the interface enhancement of the cemented carbide shield member with super impact load resistance

Method used

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  • A method for enhancing the strength of cemented carbide and metal welding interface
  • A method for enhancing the strength of cemented carbide and metal welding interface
  • A method for enhancing the strength of cemented carbide and metal welding interface

Examples

Experimental program
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Effect test

Embodiment 1

[0053] a, the configuration of nano-sol, mix aluminum sec-butoxide and distilled water with the ratio of mass molar ratio 0.01:12.4 under magnetic stirring, then add 5ml alcohol, and adjust the pH value with 1mol / l nitric acid at the same time, make the solution The pH value is 3.5±0.5, and the temperature is 60-80°C, and the stirring is continued until the solution becomes clear, and alumina nano-sol is obtained.

[0054] b. Electroplating scheme, the electroplating method of the composite coating on the steel side firstly grinds the steel with sandpaper and then performs mechanical polishing, and then electrolytically polishes the sample after mechanical polishing. The formula of the electrolyte is absolute ethanol, water, perchloric acid and The volume ratio of 20:3:2 is mixed, the sample is mechanically polished and then electropolished at -25 to -30°C, with a voltage of 1.5V and a polishing time of 20s. And the electropolished steel is electroplated in the plating solutio...

Embodiment 2

[0057] a, the configuration of nano-sol, mix aluminum sec-butoxide and distilled water in the ratio of mass molar ratio 0.01:30 under magnetic stirring, then add 5ml alcohol, adjust the pH value with 1mol / l nitric acid at the same time, make the solution The pH value is 3.5±0.5, and the temperature is 60-80°C, and the stirring is continued until the solution becomes clear, and alumina nano-sol is obtained.

[0058] b. Electroplating scheme, the electroplating method of composite coating on the cemented carbide side firstly grinds the cemented carbide with sandpaper and then performs mechanical polishing, and then performs alkali cleaning and pickling degreasing on the mechanically polished sample. Alkaline degreasing formula: Sodium hydroxide, anhydrous sodium carbonate, sodium silicate, sodium phosphate, its ratio is: 80g / L, anhydrous sodium carbonate: 30g / L, sodium silicate: 15g / L, sodium phosphate: 45g / L, will The sample is immersed in the solution, and degreased at a tempe...

Embodiment 3

[0061] a, the configuration of nano-sol, mix aluminum sec-butoxide and distilled water in the ratio of mass molar ratio 0.01:30 under magnetic stirring, then add 5ml alcohol, adjust the pH value with 1mol / l nitric acid at the same time, make the solution The pH value is 3.5±0.5, and the temperature is 60-80°C, and the stirring is continued until the solution becomes clear, and alumina nano-sol is obtained.

[0062] b. Electroplating scheme, the electroplating method of composite coating on the cemented carbide side firstly grinds the cemented carbide with sandpaper and then performs mechanical polishing, and then performs alkali cleaning and pickling degreasing on the mechanically polished sample. Alkaline degreasing formula: Sodium hydroxide, anhydrous sodium carbonate, sodium silicate, sodium phosphate, its ratio is: 80g / L, anhydrous sodium carbonate: 30g / L, sodium silicate: 15g / L, sodium phosphate: 45g / L, will The sample is immersed in the solution, and degreased at a tempe...

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Abstract

The invention discloses a method for enhancing the strength of cemented carbide and metal welding interface. Ceramic particles are added to the plating solution in the form of sol to form a sol-metal substrate composite coating on the substrate, and then the prepared sol-metal substrate is The substrates of composite coatings are connected by brazing. After welding with this method, the interface bonding strength and the mechanical properties of the joint can be enhanced.

Description

technical field [0001] The invention belongs to the field of material interface enhancement, in particular to a method for enhancing the strength of cemented carbide and metal welding interface. Background technique [0002] In recent years, with the rapid development of urban underground transportation in my country and the development of large-scale projects such as the Sichuan-Tibet line, more and more shield operations have been performed on shield machines. For underground excavation operations under different geological conditions, the components of the shield machine are required to be long-life cemented carbide and metal connection joints, and higher requirements are placed on the welding of key components of the shield machine such as scrapers. Among them, the shield machine The welding technology of bulk hard alloy and metal represented by scraper has become the key technology that limits its development. During the tunneling process, the failure of the shield mac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D5/34C25D3/56C25D3/12B23K1/06B23K1/19B23K1/20B82Y30/00
CPCB23K1/06B23K1/19B23K1/20B82Y30/00C25D3/12C25D3/562C25D5/34C25D15/00
Inventor 李远星王尧朱宗涛石鑫郑向博陈辉
Owner SOUTHWEST JIAOTONG UNIV
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