Method for solid-phase diffusion connection of hard alloy by utilizing nano-Co intermediate layer

A cemented carbide, diffusion joining technology, applied in welding equipment, metal processing equipment, non-electric welding equipment, etc., to achieve the effect of increasing flexibility and improving mechanical properties

Active Publication Date: 2016-07-06
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant report in China on the solid-state diffusion connection of cemented carbide itself with a nano-scale interlayer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of method that nanometer Co interlayer solid phase diffusion connects cemented carbide, it comprises the following steps:

[0022] (1) Wire-cut the cemented carbide YG8 to obtain (10mm×10mm×5mm) cemented carbide YG8 samples to be connected;

[0023] (2) Polish the surface to be welded of the cemented carbide YG8 sample to be joined obtained in step (1) with sandpaper, and then put it into acetone solution for ultrasonic cleaning for 15 minutes;

[0024] (3) Mix nano-Co into a paste with absolute ethanol, apply it on the surface of the cemented carbide to be welded, and assemble it into a hard alloy / nano-Co / hard alloy assembly, wherein the particle size of the nano-Co powder is 20nm , coating thickness is 50μm;

[0025] (4) Place the assembly obtained in step (3) in a vacuum heating furnace and apply a pressure of 10 MPa. When the vacuum heating furnace reaches 2.0×10--- -3 Pa, start heating, control the heating rate in the furnace to 20°C / min, rai...

Embodiment 2

[0027] Embodiment 2: The difference between this embodiment and the specific embodiment 1 is that: the selected cemented carbide is YG4C, and the particle size of nano-Co in step (3) is 40nm. Others are identical with specific embodiment 1.

Embodiment 3

[0028] Embodiment 3: The difference between this embodiment and the specific embodiment 1 or 2 is that: the selected cemented carbide is YW1, and the particle size of nano-Co in step (3) is 50nm~100nm. Others are identical with specific embodiment 1 or 2.

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Abstract

The invention relates to a method for solid-phase diffusion connection of hard alloy by utilizing a nano-Co intermediate layer. The method comprises the steps of polishing a to-be-welded surface of a hard alloy sample by using sand paper, and carrying out ultrasonic cleaning in an acetone solution; mixing nano-Co with absolute ethyl alcohol to form paste, coating the paste on the to-be-welded surface of the hard alloy, and assembling to form an assembly part of hard alloy / nano-Co / hard alloy; and placing the assembly part into a vacuum heating furnace, applying 10-20MPa pressure, starting to heat when the vacuum of the vacuum heating furnace reaches up to (1.5-2.0)*10<-3>Pa, controlling the in-furnace heating speed at 10-20 DEG C / min, heating to 1100-1300 DEG C, then, preserving the heat for 20-40 min, next, controlling the cooling speed at 5-10 DEG C / min, cooling to 400 DEG C, and then, carrying out furnace cooling. The method is simple in process, low in cost, simple in operation, high in efficiency and capable of realizing reliable connection of the hard alloy.

Description

technical field [0001] The invention relates to a solid-phase diffusion bonding method of hard alloy cutters, in particular to a method for solid-phase diffusion bonding of hard alloys with a nano-cobalt intermediate layer. Background technique [0002] We know that cemented carbide tools are made of tungsten-cobalt materials, which are composed of refractory metal carbides and bonding metals using powder metallurgy. The presence of metal carbides ensures that cemented carbides have high hardness and durability. abrasiveness, while the binder phase endows the alloy with a certain strength and toughness, making it have good wear resistance, strength and impact toughness, which makes cemented carbide widely used in cutting tools, molds, geological mining tools and wear-resistant parts etc. [0003] Cemented carbide has a variety of grades according to its composition, such as YG8, YG4C, YW1, YW2, GE1, YT30 and so on. Cemented carbide has high hardness and high brittleness, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/24B23K20/227
CPCB23K20/001B23K20/227B23K20/24
Inventor 宋晓国赵一旋付伟刘多韩林峰冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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