Multi-component ultrahigh-entropy lightweight refractory composite material

A composite material, multi-component technology, applied in the field of high temperature thermal protection materials, can solve the problems of inability to process and deform thin plates and sheets, low high temperature performance, and decreased material strength and toughness.

Active Publication Date: 2021-06-01
长沙微纳坤宸新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing high-temperature materials commonly used in aerospace, such as titanium alloys, superalloys, intermetallic compounds, ceramic matrix composites, and refractory metals, cannot meet the requirements: titanium alloys have a low density, but can only be used below 600°C; superalloys It can be used at 900-1100°C, and can be used at 1100-1300°C for a long time after surface coating, but the high-temperature alloy has a high density on the one hand, and the surface thermal barrier coating will crack and peel off when it is used for a long time. Its work is unstable; the low density of TiAl intermetallic compounds can have good h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composition of the multi-component ultra-high entropy lightweight refractory composite material in this embodiment, the mass percentage content is: Mo 40%, Ti 40%, Al 15%, Nb 1%, Si 1%, C 1%, N 1 %, O 1%;

[0031] The preparation process is as follows:

[0032] S1: By mass percentage Mo 40%, Ti 38%, Al 13%, Nb 1%, Si 0.5%, TiC 1%, TiB 2 1%, SiC 1.5%, BC 1%, Si 3 N 4 3% weigh Mo, Ti, Al, Nb, Si, TiC, TiB 2 , SiC, BC, Si 3 N 4 powder raw material;

[0033] S2: Mix the raw materials evenly by high-energy ball milling to form powder.

[0034] The parameters of the ball milling process are as follows: the ball-to-material ratio is 5:1, the rotating speed is 500r / min, the ball milling time is 5 hours, absolute ethanol is used as the medium, and Ar gas is protected; then the uniformly mixed powder is dried under vacuum to obtain dry powder;

[0035] S3: Press the dry powder into a green body under a pressure of 300MPa;

[0036] S4: Sintering the compacted body un...

Embodiment 2

[0040] The mass percentage of the multi-component ultra-high entropy lightweight refractory composite material in this embodiment is: Mo30%, Ti40%, Al 20%, Nb 4%, Si 4%, C 0.5%, N 0.5%, O 1%;

[0041]S1: By mass percentage Mo 30%, Ti 38%, Al 18%, Nb 4%, Si 4%, TiC 1%, TiB 2 1%, SiC 2%, BC 1%, Si 3 N 4 1% weigh Mo, Ti, Al, Nb, Si, TiC, TiB 2 , SiC, BC, Si 3 N 4 powder raw material;

[0042] S2: Using high-energy ball milling method to mix the raw materials evenly to form powder;

[0043] The parameters of the ball milling process are as follows: the ball-to-material ratio is 5:1, the rotating speed is 200r / min, the ball milling time is 24 hours, absolute ethanol is used as the medium, and Ar gas is protected; then the evenly mixed powder is dried under vacuum to obtain dry powder;

[0044] S3: Press the dry powder into a green body under a pressure of 100MPa;

[0045] S4: Sintering the compacted body under vacuum protection by means of discharge plasma at a sintering t...

Embodiment 3

[0049] The mass content of the multi-component ultra-high entropy lightweight refractory composite material in this embodiment is: Mo20%, Ti60%, Al 10%, Nb 4%, Si 4%, C 0.5%, N 0.5%, O 1 %;

[0050] S1: By mass percentage Mo 20%, Ti 58%, Al 10%, Nb 3%, Si 3%, TiC 1%, TiB 2 1%, SiC 2%, BC 1%, Si 3 N 4 1% weigh Mo, Ti, Al, Nb, Si, TiC, TiB 2 , SiC, BC, Si 3 N 4 powder raw material;

[0051] S2: Using high-energy ball milling method to mix the raw materials evenly to form powder;

[0052] The parameters of the ball milling process are as follows: the ball-to-material ratio is 5:1, the rotating speed is 300r / min, the ball milling time is 16 hours, absolute ethanol is the medium, and Ar gas is protected; then, the evenly mixed powder is dried in a vacuum state to obtain dry powder;

[0053] S3: Press the dry powder into a green body under a pressure of 200MPa;

[0054] S4: Sintering the compacted body under vacuum protection by means of discharge plasma at a sintering temp...

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Abstract

The invention provides a multi-component ultrahigh-entropy light-weight refractory composite material. Four light alloy elements including Mo, Ti, Al and Nb are used as a matrix, non-metallic elements including Si, C, N, B and O are introduced into the matrix, and the composite material contains multiphase ceramics including TiC, TiB2, SiC, Si3N4, BC, MoSi2, Nb2O5, SiO2 and the like, so that the high-temperature strength and oxidation resistance of the matrix are effectively improved, and the low-density, high-temperature, high-toughness and long-term oxidation resistance performance of alloy can be achieved. According to the multi-component ultrahigh-entropy light-weight refractory composite material, the composite material is prepared through powder mixing, forming, sintering and pre-oxidation, and the anti-oxidation time of the composite material in the air environment of 800-1500 DEG C is 100-300 h; the room-temperature tensile strength is 600-1000 MPa, and the ductility is greater than or equal to 10%; and the density is 4.5-5.5 g/cm<3>. The multi-component ultrahigh-entropy light-weight refractory composite material is suitable for the fields of aviation, spaceflight, weapons, nuclear energy, microelectronics and the like.

Description

technical field [0001] The invention relates to the field of high-temperature thermal protection materials, in particular to a multi-component ultra-high-entropy lightweight refractory composite material. Background technique [0002] With the development of cutting-edge technology, the hot-end components of aircraft and aero-engines put forward extremely high requirements for high-temperature materials. For example, if the aircraft is used for long-term cruise flight and repeated use at low altitudes at Ma0-6, it is required that the large-area skin is resistant to high temperatures of 800-1200°C, lightweight, anti-oxidation, and anti-ablation. Another example is that the temperature in front of the turbine of a new generation of aero-engine is as high as 2100K, and the turbine blades are required to withstand high temperatures above 1500°C under the cooling effect of the cooling gas, and at the same time withstand high-pressure gas erosion. Existing high-temperature mater...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C30/00C22C14/00C22C1/05B22F9/04B22F3/105B22F3/24
CPCB22F3/105B22F3/24B22F9/04B22F2003/248B22F2009/043C22C1/05C22C14/00C22C27/04C22C30/00
Inventor 范景莲范衍陆琼田家敏李凌群王林海
Owner 长沙微纳坤宸新材料有限公司
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