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Refractory high-entropy alloy/titanium carbide composite and preparation method thereof

A high-entropy alloy and composite material technology, applied in the field of refractory high-entropy alloy/titanium carbide composite materials and its preparation, can solve problems such as failure to meet service requirements and poor mechanical properties, and achieve high hardness, good mechanical properties, The effect of high thermal stability

Active Publication Date: 2016-10-26
江西咏泰粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing high-entropy alloy composite materials mostly use BCC or FCC single-phase high-entropy alloys composed of low-melting-point metals as the matrix, and add metal carbides or nitrides as reinforcing phases to improve the mechanical properties of the materials. However, this high-entropy alloy The matrix softens severely at high temperature, and as the temperature rises, the mechanical properties deteriorate rapidly, which cannot meet the service requirements in high temperature environments

Method used

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  • Refractory high-entropy alloy/titanium carbide composite and preparation method thereof
  • Refractory high-entropy alloy/titanium carbide composite and preparation method thereof
  • Refractory high-entropy alloy/titanium carbide composite and preparation method thereof

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Embodiment 1

[0034] A refractory high-entropy alloy / titanium carbide composite material of the present invention, with the refractory high-entropy alloy as the matrix phase and titanium carbide as the reinforcing phase; the matrix phase refractory high-entropy alloy mainly contains W, Mo, Ta, Nb , V, Ti six elements, and the molar amounts of these six elements are equal, the volume ratio of the matrix phase and the reinforcement phase is about 1:2.

[0035] The preparation method of the refractory high-entropy alloy / titanium carbide composite material of the present embodiment comprises the following steps:

[0036] (1) Select commercially available WC and Mo with a purity higher than 99.5% (mass percentage) and an average particle size between 1 and 2 μm 2 C, TaC, NbC, VC, TiC, the molar ratio is WC:Mo 2 C:TaC:NbC:VC:TiC=1:0.5:1:1:1:1 ratio mixed into high entropy matrix powder;

[0037] (2) According to the molar ratio WC:Ti=1:5.5, the titanium powder and the high-entropy matrix powder...

Embodiment 2

[0043] A kind of refractory high-entropy alloy / titanium carbide composite material of the present invention, with refractory high-entropy alloy as the matrix phase and titanium carbide as the reinforcing phase; the matrix phase refractory high-entropy alloy mainly contains W, Ta, Nb, V , Ti, Cr six elements, and the molar amounts of these six elements are equal, the volume ratio of the matrix phase and the reinforcement phase is about 1:3.

[0044] The preparation method of the refractory high-entropy alloy / titanium carbide composite material of the present embodiment comprises the following steps:

[0045] (1) Select commercially available WC, TaC, NbC, VC, TiC, Cr with a purity higher than 99.5% (mass percentage) and an average particle size between 1 and 2 μm 3 C 2 WC:TaC:NbC:VC:TiC:Cr in molar ratio 3 C 2 = 1:1:1:1:1:0.33 ratio mixed into high entropy matrix powder;

[0046] (2) According to the molar ratio of WC:Ti=1:5, the titanium powder and the high-entropy matrix ...

Embodiment 3

[0052] A refractory high-entropy alloy / titanium carbide composite material of the present invention, with the refractory high-entropy alloy as the matrix phase and titanium carbide as the reinforcing phase; the matrix phase refractory high-entropy alloy mainly contains W, Mo, Ta, Nb , V, Ti six elements, and the molar amounts of these six elements are equal, the volume ratio of the matrix phase and the reinforcement phase is about 1:1.

[0053] The preparation method of the refractory high-entropy alloy / titanium carbide composite material of the present embodiment comprises the following steps:

[0054] (1) Select commercially available WC and Mo with a purity higher than 99.5% (mass percentage) and an average particle size between 1 and 2 μm 2 C, TaC, NbC, VC, TiC, the molar ratio is WC:Mo 2 C:TaC:NbC:VC:TiC=1:0.5:1:1:1:1 ratio mixed into high entropy matrix powder;

[0055] (2) According to the molar ratio WC:Ti=1:5.5, the titanium powder and the high-entropy matrix powder...

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Abstract

The invention discloses a refractory high-entropy alloy / titanium carbide composite. A refractory high-entropy alloy serves as a matrix phase, and titanium carbide serves as a wild phase; and elements in the refractory high-entropy alloy are selected from at least four kinds of elements of W, Mo, Ta, Nb, V, Ti, Zr, Hf and Cr. A preparation method of the refractory high-entropy alloy / titanium carbide composite comprises the steps that at least four kinds of carbonization metal powder in tungsten carbide, molybdenum carbide, tantalum carbide, niobium carbide, vanadium carbide, the titanium carbide, hafnium carbide, zirconium carbide and chromium carbide are selected and mixed according to the equal molar ratio or the ratio close to the equal molar ratio to form high-entropy matrix powder; and after the high-entropy matrix powder and titanium powder are mixed, alloy mechanization is carried out, then spark plasma sintering or hot-press sintering is carried out, and the refractory high-entropy alloy / titanium carbide composite is obtained. The density and cost of the composite are reduced while the hardness of the composite is improved, excellent high-temperature performance is achieved, and the requirement for manufacturing a high-temperature structural component is met.

Description

technical field [0001] The invention belongs to the field of composite material preparation, in particular to an in-situ generated refractory high-entropy alloy / titanium carbide composite material and a preparation method thereof. Background technique [0002] High-entropy alloys are new types of alloys composed of a variety of main elements. They have the characteristics of high mixing entropy, high lattice distortion, and slow element diffusion process. Therefore, they have excellent mechanical properties, such as high hardness, high wear resistance, high Corrosion resistance, etc., have high academic research value and industrial application potential, which has attracted extensive attention of material researchers. Among them, refractory metal high-entropy alloys for high-temperature structures have been extensively studied. Refractory high-entropy alloys have excellent high-temperature mechanical properties and have broad application prospects in the fields of aerospac...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C32/00C22C1/05
CPCC22C1/058C22C30/00C22C32/0052
Inventor 刘咏王京师刘彬王家文
Owner 江西咏泰粉末冶金有限公司
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