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A metal/carbide core-shell reinforced steel matrix composite material and its preparation method

A composite material and carbide technology, applied in the field of powder metallurgy, can solve problems such as restricting a wide range of applications, and achieve the effect of reducing preparation costs and saving resources

Active Publication Date: 2021-09-07
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to this inverted relationship between the strength and toughness of carbide / steel matrix composites, it limits its wider application

Method used

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  • A metal/carbide core-shell reinforced steel matrix composite material and its preparation method
  • A metal/carbide core-shell reinforced steel matrix composite material and its preparation method
  • A metal/carbide core-shell reinforced steel matrix composite material and its preparation method

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preparation example Construction

[0040] A method for preparing a metal / carbide core-shell reinforced steel-based composite material of the present invention specifically comprises the following steps:

[0041] Step 1, selection and preparation of material system

[0042] The first system: Weigh the following components by mass percentage: 2.45%-16.2% graphite powder, 10%-30% iron powder and 67.5%-82% high-toughness metal powder, the total weight percentage of the above components is 100%;

[0043]The second system: it consists of the following components by mass percentage: 70% to 80% carbon steel powder and 20% to 30% high toughness metal powder, the total weight percentage of the above components is 100%; The mass percentage is: 0.65% ~ 1.8% C, the rest is iron;

[0044] The high-toughness metal powder is one or more of tantalum powder, niobium powder, titanium powder, zirconium powder, and vanadium powder;

[0045] The relative scale K between the diameter R of the metal core and the thickness d of the ...

Embodiment 1

[0055] A method for preparing a Ta / TaC core-shell reinforced iron-based composite material, specifically comprising the following steps:

[0056] Step 1, take the following components by mass percentage respectively: 2.45% graphite powder and 30% iron powder, all the other are tantalum powder, the particle size of tantalum powder is 2000 orders (that is, particle diameter is about 6.5 μm), the above each component The sum of the percentages by weight is 100%;

[0057] Step 2, mixing, using a V-type mixer to mix the components weighed in step 1. The speed of the V-type mixer is 60r / min, and the mixing time is 6h. After mixing evenly, the mixed powder is obtained;

[0058] Step 3, compact pre-forming

[0059] The mixed powder in step 2 is pressed into shape by ordinary molding to obtain a green compact; before pressing, add paraffin wax accounting for 2wt% of the weight of the mixed powder to the mixed powder as a forming agent. Pressure, the unit pressing pressure is 1.0t / cm ...

Embodiment 2

[0070] A preparation method of a Ti / TiC core-shell reinforced iron-based composite material, specifically comprising the following steps:

[0071] Step 1, take the following components by mass percentage respectively: 5.5% graphite powder and 10% iron powder, all the other are titanium powder, the particle size of titanium powder is 500 orders (that is, the particle diameter is about 10 μ m), the weight of each of the above components The sum of the percentages is 100%;

[0072] Step 2, mixing, using a V-type mixer to mix the components weighed in step 1. The speed of the V-type mixer is 65r / min, and the mixing time is 8h. After mixing evenly, the mixed powder is obtained;

[0073] Step 3, compact pre-forming

[0074] Cold isostatic pressing is used to compress the mixed powder in step 2 to obtain a green compact; before pressing and forming, add paraffin wax accounting for 2wt% of the weight of the mixed powder to the mixed powder as a forming agent. Determine the pressing ...

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Abstract

The invention discloses a metal / carbide core-shell reinforced steel-based composite material. The composite material is composed of a metal / carbide core-shell reinforcement phase and a steel matrix material. The metal / carbide core-shell uses a high-toughness metal M as the core, and Carbide M corresponding to metal M x C y For the shell, the carbide M x C y The carbide volume fraction and shape size in the shell change in a gradient manner. The invention also discloses a method for preparing a metal / carbide core-shell reinforced steel-based composite material. In the metal / carbide core-shell reinforced steel-based composite material prepared by the method, the core-shell is tough on the inside and hard on the outside, and the carbide shell and The metal cores have good interfacial bonding and can be used in a wide range of applications.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a metal / carbide core-shell reinforced iron-based composite material and a preparation method thereof. Background technique [0002] With the rapid development of modern industry, there is an urgent need for tools, dies and structural parts that work under complex service conditions such as high temperature, high speed, and wear resistance, such as rolling rings of high-speed rolling mills, rolls of guide wheels, hot work dies, etc., while traditional A single steel material is difficult to meet the needs of service conditions. [0003] Carbide-reinforced steel-based composites are widely used in metallurgy, coal mines, petrochemicals, Aerospace and other industries. The improvement of wear resistance and strength of steel matrix composites is mainly through changing the volume fraction of the reinforcing phase in the composites. However, as the volume fra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/12C22C38/14C22C29/06C22C29/10C22C1/05C22C1/10
CPCC22C1/051C22C29/06C22C29/10C22C33/0292C22C38/12C22C38/14
Inventor 钟黎声白海强许云华魏俊哲邓超商昭朱建雷
Owner XIAN UNIV OF TECH