Interlayer-free diffusion connecting method of hard alloy and steel

A cemented carbide and diffusion bonding technology, which is applied in the field of welding, can solve the problems of external pressure and intermediate layer, and achieve the effects of slow cooling speed, favorable joint formation and high bonding strength

Inactive Publication Date: 2015-05-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems of external pressure and intermediate layer when connecting cemented carbide and steel, and invents a diffusion bonding method for cemented carbide and steel without an intermediate layer

Method used

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  • Interlayer-free diffusion connecting method of hard alloy and steel

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example 1

[0016] Example 1: The particle size of Co in the raw material powder for preparing cemented carbide is 1.1 μm, the particle size of Ni is 1.3 μm, the particle size of Fe is 2.4 μm, and the particle size of WC is 2.0 μm; the weight percentage of cemented carbide is that Co accounts for 10wt% , Ni accounts for 2wt%, Fe accounts for 3wt%, and WC is the balance. The ball milling medium of cemented carbide mixed powder is absolute ethanol, the dosage is 280ml, the ball milling speed is 70r / min, the milling time is 64h, the grinding ball is Φ8mm WC-8wt%Co cemented carbide ball, the weight ratio of ball to material The ratio is 5:1; after ball milling, the cemented carbide slurry is filtered with 400 mesh, the vacuum drying temperature is 90°C, and the vacuum degree is 1 Pa; the addition of butadiene rubber is 30 wt%, and the powder mixed with butadiene rubber is in the Dry at 85°C for 2 hours, and sieve through 100 mesh. The powder is pressed into a cemented carbide green body with...

example 2

[0017]Example 2: The particle size of Co in the raw material powder for preparing cemented carbide is 1.3 μm, the particle size of Fe is 3.0 μm, and the particle size of WC is 1.3 μm; for the margin. The ball milling medium of cemented carbide mixed powder is absolute ethanol, the dosage is 400ml, the ball milling speed is 100r / min, the milling time is 64h, the grinding ball is Φ6mm WC-8wt%Co cemented carbide ball, the weight ratio of ball to material 10:1; after ball milling, the cemented carbide slurry was filtered through 400 mesh, the vacuum drying temperature was 100°C, and the vacuum degree was 2 Pa; the addition of butadiene rubber was 40 wt%, and the powder mixed with butadiene rubber was Dry at 90°C for 1 hour, and sieve through 100 mesh. The powder is pressed into a cemented carbide green body with a cavity in the center, and the porosity of the green body is 60% by adjusting the filling weight of the cemented carbide powder coated with butadiene rubber, and the pre...

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Abstract

The invention discloses an interlay-free diffusion connecting method of hard alloy and steel. The interlay-free layer diffusion connecting method is characterized by comprising the steps of firstly, evenly mixing 10-40wt% of excessive buna with hard alloy raw material powder, forming the hard alloy powder coated by the buna; pressing into a green body with the porosity of 55-80% by adjusting the powder filling quantity; then putting the steel into a middle cavity of a porous hard alloy green body to carry out liquid-phase sintering; reducing the hole size and quality of the green body in a sintering process at high temperature of 1300-1440 DEG C, wherein the porosity of the sintering body is 25-50%; further heating to 1450-1600 DEG C to melt steel; diffusing the steel liquid into the hard alloy and filling into continuous holes inside the hard alloy; and forming metallurgical bonding with high bonding strength. The interlay-free diffusion connecting method of hard alloy and steel has the advantages that hard alloy sintering and diffusion connecting are combined; an active interlayer does not exist; the technology is simple; and a steel metal phase penetrates into carbon steel from inside of the hard alloy, diffusion is enough, residual stress is low, and bonding strength is high.

Description

technical field [0001] The invention relates to a method for connecting cemented carbide materials and steel, in particular to a method for connecting cemented carbide and steel without an intermediate layer, and belongs to the field of welding. Background technique [0002] Cemented carbide is a multi-phase material with high hardness and high wear resistance produced by powder metallurgy technology based on refractory metal carbides such as WC and iron group metal elements (Fe, Co, Ni) as the binder phase. . Cemented carbide has very excellent properties, but the price of cemented carbide is expensive, and its application range is limited. In addition, since most cemented carbides are produced by powder metallurgy, the limitation of its production process makes it difficult to produce larger-sized cemented carbide products. Moreover, many parts do not need to be made of cemented carbide as a whole when they are in use. Therefore, connecting cemented carbide with steel w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/00
Inventor 郭智兴熊计万维财钟华
Owner SICHUAN UNIV
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