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Hard alloy and double-metal composite technique

A cemented carbide and composite process technology, which is applied in the field of cemented carbide and its bimetal composite material manufacturing process and equipment, can solve the problem that the composite interface cannot form a metallurgical bonding layer, the bonding interface cannot be fully fused, and the cemented carbide is expensive To achieve the effect of promoting material and energy exchange, excellent crystal structure and low cost

Active Publication Date: 2012-10-31
丁家伟 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the principle of inlay casting, if a metallurgical bonding layer is to be formed between two materials, the inlay casting ratio must be greater than 10. When the inlay casting ratio is less than 10, the composite interface will not be able to form a complete metallurgical bonding layer, thus limiting the application field.
The cemented carbide currently used all uses a large amount of cobalt as a binder or adds some nickel and chromium to the binder, which makes the price of the cemented carbide expensive, and there is also a cemented carbide matrix WC and matrix steel ( The wettability of iron) is poor, the linear expansion coefficient difference between the two materials is large, and the bonding interface between the two materials cannot be fully fused during manufacturing.

Method used

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  • Hard alloy and double-metal composite technique
  • Hard alloy and double-metal composite technique
  • Hard alloy and double-metal composite technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: In Figure 1, 10%-40% of high-chromium cast iron or improved high-chromium cast iron containing the following components and percentages is used as a cemented carbide binder:

[0022] (1) C 1.5-3.8%, Cr 15-27%, remainder Fe;

[0023] (2) C 1.5-3.8%, Cr 15-27%, Ni 0.4-2.5%, remainder Fe;

[0024] (3) C 1.5-3.8%, Cr 15-27%, Co 0.5-3%, Mo 0.4-3%, V 0.2-2%, remainder Fe;

[0025] (4) High-chromium cast iron and improved high-chromium cast iron alloys of rare earth and rare earth alloys containing an appropriate amount of cerium, lanthanum or yttrium can also be added to the alloys of the above components.

[0026] The cemented carbide particles containing the following components and percentages with a content of 90%-60% are used as the hard phase.

[0027] (1) WC particles 100%;

[0028] (2) 100% TiC particles;

[0029] (3) 70%-90% of WC particles;

[0030] TiC particles 30%-10%;

[0031] (4) The total amount of TaC below 8% or NbC below 10% can also be add...

Embodiment 2

[0034] Embodiment 2: In Figure 2, the equipment is made of a casting mold 4 made of refractory materials, an electromagnetic induction heater 5 is installed outside the casting mold 4, and a water-cooling box base 6 is connected to the bottom of the casting mold 4. A water inlet pipe 8 is installed on the bottom of any side of the box base 6 , a water outlet pipe 7 is installed on the top of any side of the water-cooled box base 6 , and a pouring insulation riser 1 is connected to the top of the mold 4 .

[0035] At the beginning of the work, any one of the above-mentioned components is cleaned and dried after removing oxides, and a layer of 1-4mm thick cast iron powder 9 or Iron powder containing 2%-10% nickel 9 or iron powder containing cemented carbide particles such as 10%-50% WC or iron powder containing 2%-10% nickel or hard alloy containing 10%-50% WC Alloy particles, 2%-10% nickel, 2%-15% chromium and 1%-5% molybdenum and iron powder 9 of other alloys (or iron powder 9...

Embodiment 3

[0037] Example 3: In image 3 2 is that two or more cemented carbides 10 are installed in the casting mold 4 , and by repeating the above process, the simultaneous compounding of multiple cemented carbides can be realized. Other processes and equipment are the same as in Example 2. slightly.

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Abstract

The utility model relates to a composite art and apparatus for hard alloy and bimetal, wherein the hard alloy is made of C with the content from 1.5 to 3.8 percent, Cr with the content from 15 to 27 percent, high chromium foundry iron with the content Fe used as binder, WC or TIC particles by the powder metallurgy technique, wherein the C and Cr are both accounted for 10-40 percent, the rest is the high chromium foundry iron, the WC or the TIC has the content from 90 to 60 percent. The hard alloy proceed composite casting with the C with the content from 1.5 to 3.8 percent, the Cr with the content from 15 to 25 percent, the rest high chromium foundry iron and spheroidal graphite cast iron in the mould provided with an electro-magnetism induction heater outside. The recombination of two materials is achieved by directly heating to the hard alloy and base metal liquid via the induction heater in the process of casting. The hard alloy produced by the invention has better wetting propertyand less bulking difference to the base metal, and is capable of achieving good recombination with the base metal. The invention has the advantages of simple recombination technique, easy achievementof technique, good property of the recombination products and low manufacturing costs.

Description

technical field [0001] The present invention relates to cemented carbide and its composite material, in particular to a cemented carbide containing Fe, Ni, Cr, Mo, Co and other alloys as binders and its bimetallic composite material manufacturing process and equipment. Background technique [0002] As a high wear-resistant material, cemented carbide is widely used in cutting tools, molds, chisels, geological drilling and metallurgical rollers due to its high hardness, high strength and high wear resistance. field. The traditional cemented carbide is manufactured by powder metallurgy sintering process using cobalt as a binder. Cobalt is a scarce strategic substance and its price is high. In recent years, due to the development of the world industry, the demand for cobalt is increasing, resulting in a global shortage of cobalt supply, and the price of cobalt has skyrocketed. Carbide, which is already expensive, is even more expensive. At the same time, because cemented car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/16C22C1/04C22C37/06C22C29/06
Inventor 丁家伟丁刚
Owner 丁家伟
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