Method for preparing TiC-based metal ceramic with high-entropy alloy binding phase

A high-entropy alloy and cermet technology, applied in the fields of mechanical processing and powder metallurgy, can solve the problems of complex control of sintering performance and mechanical properties of powder metallurgy products

Active Publication Date: 2021-04-20
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dissolution, precipitation and diffusion of solute elements in the solvent will produce some chemical reactions in the intermediate process. The control of the chemical reaction in the intermediate process and its influence on the final structure can only be theoretically inferred. Therefore, the final sintering performance and mechanical properties of powder metallurgy products control becomes more complex

Method used

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  • Method for preparing TiC-based metal ceramic with high-entropy alloy binding phase
  • Method for preparing TiC-based metal ceramic with high-entropy alloy binding phase
  • Method for preparing TiC-based metal ceramic with high-entropy alloy binding phase

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Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing a TiC-based cermet material with a high-entropy alloy binder phase, comprising the following steps:

[0037] 1) It is the preparation of high energy storage alloy mixture: Ni powder, Co powder, Cr powder, Mo powder, Ti powder, W powder, carbon powder and other raw materials are used, and the mole fraction of the configuration materials is Ni: 30%, Co: 30 %, Cr: 10%, Mo: 10%, W: 5%, Ti: 15% of the mixture, an additional carbon powder with a mole fraction of 3.8% is added to the mixture to remove oxygen in the mixture and promote the sintering process In-situ precipitation of titanium carbides and their composite carbides; absolute ethanol is used as the dispersion medium, the amount of absolute ethanol is 30:100 for the ratio of alcohol to material, YG8 cemented carbide balls are used as grinding balls, and the ratio of ball to material 10:1; mix on planetary ball mill, speed 280r / min, time 60h;

[0038] 2) Add ceramic powder to the mixture for th...

Embodiment 2

[0045] The composition combination, mixing method, preparation process and sintering route of Example 1 were adopted. In Example 2, firstly, the second addition of ceramic powder is not used in the preparation of the binder phase mixture, that is, the method of directly adding the ceramic powder into the wet material of the binder phase in the second step of Example 1 is not used. Instead, after obtaining the binder phase alloy mixed slurry, it is dried in an oven at 80°C and sieved for use. Then it is further configured into a cermet mixture with a material mass fraction of 78wt.% ceramic powder and 22wt.% active alloy mixed powder; the mixing method of the mixture is the same as in Example 1.

[0046] After analysis, there is no detailed difference in the morphology of the alloy mixture and the cermet mixture after ball milling. The metallographic structure and scanning structure of the sintered body have no other phase formation, which is a typical two-phase structure of c...

Embodiment 3

[0048] Change the ratio of the binder phase mixture, the mole fraction of the configuration material is Ni: 35.0%, Co: 10.0%, Cr: 5.0%, Mo: 13.0%, W: 7.0%, Ti: 30.0% of the mixture, the mixture An additional carbon powder with a mole fraction of 8.0% was added. The mass fraction of the cermet mixture is: ceramic powder 68wt.%, high energy storage alloy powder 32wt.%. The mixing process and sintering route are the same as in Example 1, and the mixing time is extended to 72h.

[0049] After analysis, the morphology characteristics of the alloy mixture after the ball milling process is still a flat shape, and the particle size of the mixture tested by the laser particle size analyzer has little change compared with Example 1. It can be seen that after the ball milling time 60, the alloy mixture The plastic deformation, work hardening, welding and fracture of the material reach a balanced state. XRD was used for phase analysis and it was found that no new phase was formed. The ...

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Abstract

The invention relates to the field of powder metallurgy and multi-principal-element high-entropy alloy materials, in particular to a method for preparing a metal ceramic composite material with a high-entropy alloy binding phase. The TiC-based metal ceramic material with the high-entropy alloy binding phase prepared by the method is characterized in that the binding phase is high-entropy alloy NiCoCrMoWTi, the molar fraction of Ni is 30.0%-35%, the molar fraction of Co is 10.0%-35%, the molar fraction of Cr is 5.0%-20.0%, the molar fraction of Mo is 5.0%-20.0%, the molar fraction of W is 5.0%-15%, the molar fraction of Ti is 5.0%-35%, and the sum of the molar fractions of all the components is 100%. The prepared TiC-based metal ceramic with the high-entropy alloy binding phase prepared by the method has higher strength, hardness, wear resistance and oxidation resistance, in-situ precipitation of a TiC ceramic phase is achieved in the preparation process, and therefore the grain size of a sintered body is refined, and an interface between the binding phase and a hard phase of the sintered body have a coherency relationship.

Description

technical field [0001] The invention relates to the fields of mechanical processing and powder metallurgy, in particular to a method for preparing a TiC-based cermet of a high-entropy alloy binder phase. Background technique [0002] As a new type of multi-principal alloy material, high-entropy alloy has a simple body-centered or face-centered solid solution structure. High-entropy alloys have high entropy values ​​that ordinary alloys do not have, so high-entropy alloys have excellent mechanical properties that ordinary alloys do not have, including high hardness, high strength, good ductility, excellent wear resistance and corrosion resistance Wait. [0003] TiC-based cermet materials consist of two phases, a hard phase and a binder phase. The binder phase is usually a Ni or Co-based solid solution alloy, which is the plastic-ductile structural unit of the cermet material. The traditional preparation method of cermet sintered body is to mix ceramic powder and metal elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/10B22F3/02B22F3/10B22F9/04C22C1/05
Inventor 石增敏王杨洋张大勇杨蔚华方子帆
Owner CHINA THREE GORGES UNIV
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