Unlock instant, AI-driven research and patent intelligence for your innovation.

Non-stoichiometric-ratio high-entropy ceramic and preparation method thereof

A non-stoichiometric, high-entropy technology, applied in the field of high-entropy ceramics, can solve the problems of unstable quality of sintered body, complicated preparation process, easy oxidation, etc., and achieve the effect of convenient industrial production, simple preparation process and more stable performance

Active Publication Date: 2021-12-24
YANSHAN UNIV
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prefabricated non-stoichiometric components are prone to oxidation and other problems during preparation, especially in the process of mixing with other components. Due to the sensitivity of non-stoichiometric components, from the preparation of non-stoichiometric components to high The sintering of entropic ceramics, exposed to the atmosphere at least twice, is more prone to oxidation, thus complicating the preparation process and resulting in unstable quality of the sintered body

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Non-stoichiometric-ratio high-entropy ceramic and preparation method thereof
  • Non-stoichiometric-ratio high-entropy ceramic and preparation method thereof
  • Non-stoichiometric-ratio high-entropy ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh TiC, TaC and Nb equimolarly and put them into a ball mill jar with a ball-to-material ratio of 20:1.

[0039] (2) Stir and mix in an argon glove box, and then the ball mill jar is sealed. The precursor powder was obtained by mechanical alloying on a ball mill for 20 h.

[0040] (3) Put the precursor powder obtained in step (2) into a mold for pre-compression molding at room temperature, keep the pressure at 100 MPa, release the pressure after 10 minutes, and demould to prepare a billet.

[0041] (4) Put the billet into the graphite mold and sinter with spark plasma. Apply a pressure of 40 MPa, pass through an Ar protective atmosphere at 600 °C, raise the temperature to 1600 °C at a rate of 50 °C / min, keep it for 10 min, and then naturally cool to room temperature to obtain a non-stoichiometric high-entropy carbide (NbTiTa)C 0.67 .

[0042] The XRD figure of sample (as figure 1 ), the results show that the non-stoichiometric high-entropy carbide (NbTiTa) C ...

Embodiment 2

[0044] (1) Weigh TiC, TaC and Nb equimolarly and put them into a ball mill jar with a ball-to-material ratio of 20:1.

[0045] (2) Stir and mix in an argon glove box, and then the ball mill jar is sealed. The precursor powder was obtained by mechanical alloying on a ball mill for 20 h.

[0046] (3) Put the precursor powder obtained in step (2) into a mold for pre-compression molding at room temperature, keep the pressure at 100 MPa, release the pressure after 10 minutes, and demould, and prepare a billet;

[0047] (4) Put the billet into the graphite mold and sinter with spark plasma. Apply a pressure of 40 MPa, pass through an Ar protective atmosphere at 600 °C, raise the temperature to 1700 °C at a rate of 50 °C / min, keep it for 10 min, and then naturally cool to room temperature to obtain a non-stoichiometric high-entropy carbide (NbTiTa)C 0.67 .

[0048] The XRD figure of sample (as figure 2 ), the results show that the non-stoichiometric high-entropy carbide (NbTiTa)...

Embodiment 3

[0050] (1) Weigh Nb / TiC / TaC / VC / WC equimolarly and put them into a ball mill jar with a ball-to-material ratio of 10:1.

[0051] (2) Stir and mix in an argon glove box, and then the ball mill jar is sealed. Mechanically alloyed on a ball mill for 40 h to obtain a precursor powder.

[0052] (3) Put the precursor powder obtained in step (2) into a mold for pre-compression molding at room temperature, keep the pressure at 200 MPa, release the pressure after 10 minutes, and demould, and prepare a billet;

[0053] (4) Put the billet into the graphite mold and sinter with spark plasma. Apply a pressure of 50 MPa, pass through an Ar protective atmosphere at 600 °C, raise the temperature to 1600 °C at 100 °C / min, keep it for 10 min, and then cool it naturally to room temperature to obtain a non-stoichiometric high-entropy carbide (NbTiTaVW)C 0.8 .

[0054] The XRD figure of sample (as Figure 5 ), it can be seen that the precursor powder has a single-phase face-centered cubic struc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses non-stoichiometric-ratio high-entropy ceramic and a preparation method thereof, and belongs to the technical field of high-entropy ceramic. The invention provides a non-stoichiometric-ratio high-entropy ceramic, which is one of MCX, MNX and M(CN)X, wherein X is more than or equal to 0.5 and less than or equal to 0.9, MCX is a non-stoichiometric-ratio IVB, VB or VIB group transition metal carbide, MNX is a non-stoichiometric-ratio IVB, VB or VIB group transition metal nitride, and M(CN)X is a non-stoichiometric-ratio IVB, VB or VIB group transition metal covalent bond carbon nitrogen compound and is of a single-phase single-face-centered cubic crystal structure. The invention also provides a preparation method of the non-stoichiometric-ratio high-entropy ceramic. According to the invention, the sintering temperature of the high-entropy ceramic is remarkably reduced, the preparation process is simple, and industrial production is facilitated; and the non-stoichiometric-ratio high-entropy ceramic product has fine crystal grains and high density, and shows good hardness and toughness.

Description

technical field [0001] The invention belongs to the technical field of high-entropy ceramics, and in particular relates to a non-stoichiometric ratio high-entropy ceramic and a preparation method thereof. Background technique [0002] Covalent bond compounds of transition metals have high hardness and high heat resistance. Therefore, this type of material has excellent properties such as high hardness, low thermal conductivity and corrosion resistance, and is widely used in aerospace, nuclear energy and cutting processing and other fields. The "high entropy effect" originated from high entropy alloys and was later introduced into the research of ceramic materials. High-entropy ceramics are single-phase covalent bond compounds formed by multi-component compounds through certain treatment and sintering, and their crystal structure is consistent with most of the participating components. The "high entropy effect" brought by multiple components suppresses the phase separation t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C04B35/56C04B35/58C04B35/622C04B35/645
CPCC04B35/56C04B35/5607C04B35/58C04B35/58007C04B35/622C04B35/645C04B2235/666C04B2235/6581C04B2235/6586C04B2235/6562C04B2235/6567C04B2235/96C04B2235/3843C04B2235/404C04B2235/3847C04B2235/3886
Inventor 王明智翟新宣邹芹赵玉成宁泱锦刘树通
Owner YANSHAN UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com