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ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material as well as preparation method thereof

A ceramic material and ultra-high temperature technology, which is applied in the field of ultra-high temperature materials and their preparation, can solve the problems of poor mechanical properties of materials, high pressure required, and low sintering temperature, and achieve thermodynamic stability, good mechanical properties, and low preparation temperature. Effect

Active Publication Date: 2018-11-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of high temperature, high pressure, and poor mechanical properties of the ultra-high-temperature ceramic materials prepared by the prior art, the present invention proposes to prepare a ZrHfTaNbTiC ultra-high-temperature high-entropy ceramic material and its method by using hot-pressing sintering technology. The method uses ZrC, HfC, TaC, NbC and TiC micron-sized powders as raw materials, and successfully prepares single-phase ZrHfTaNbTiC high-entropy ceramics through hot-pressing sintering technology. This method has simple process, high repeatability, and low sintering temperature (1700~ 1900℃), the required external pressure is small (20-30MPa), and the prepared ZrHfTaNbTiC high-entropy ceramics have a single rock-salt phase structure, uniform composition, stable thermodynamics, wide adjustment space for element ratio and good mechanical properties. Up to 38.52~41.25GPa

Method used

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  • ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material as well as preparation method thereof
  • ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material as well as preparation method thereof
  • ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material as well as preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Preparation of ZrHfTaNbTiC ultra-high temperature high-entropy ceramic material, the specific steps are as follows:

[0032] (1) Weigh the powders of 10.3g ZrC, 19.1g HfC, 19.3g TaC, 10.5g NbC and 6.1g TiC respectively, pour them into a PTFE ball mill jar, and take and mix with ZrC, HfC, TaC, NbC and TiC The agate balls whose mixed material volume ratio is 2:1 are put into a ball mill jar, then poured into 30ml of absolute ethanol, and with a planetary ball mill, ball milled for 6h at a speed of 500r / min to obtain a homogeneously mixed suspension;

[0033] (2) Transfer the obtained suspension to an eggplant-shaped flask and install it into a rotary steaming system, and rotate it at 60°C for 1 hour to obtain a semi-dry powder that is uniformly mixed, and then place the semi-dry powder in a drying oven Dry at 70°C for 12 hours, place it in an agate mortar and grind it by hand for 10 minutes and pass through a 200-mesh sieve to obtain a powder to be fired;

[0034] (3) Tr...

Embodiment 2

[0037] Preparation of ZrHfTaNbTiC ultra-high temperature high-entropy ceramic material, the specific steps are as follows:

[0038](1) Weigh the powders of 1g ZrC, 10g HfC, 10g TaC, 1.33g NbC and 2.21g TiC respectively, pour them into a PTFE ball mill jar, and take the mixed materials with ZrC, HfC, TaC, NbC and TiC Put agate balls with a volume ratio of 2:1 into a ball mill jar, then pour 35ml of absolute ethanol, and use a planetary ball mill to mill for 16 hours at a speed of 500r / min to obtain a uniformly mixed suspension;

[0039] (2) Transfer the obtained suspension to an eggplant-shaped flask and install it into a rotary steaming system, and rotate it at 60°C for 2 hours to obtain a semi-dry powder that is uniformly mixed, and then place the semi-dry powder in a drying box Dry at 80°C for 16 hours, place it in an agate mortar and grind it by hand for 20 minutes and pass through a 200-mesh sieve to obtain the ceramic powder to be fired;

[0040] (3) Transfer the ceramic...

Embodiment 3

[0042] Preparation of ZrHfTaNbTiC ultra-high temperature high-entropy ceramic material, the specific steps are as follows:

[0043] (1) Weigh the powders of 5g ZrC, 5g HfC, 5g TaC, 5g NbC and 5g TiC respectively, pour them into a polytetrafluoroethylene ball mill jar, and take the volume ratio of the mixed material with ZrC, HfC, TaC, NbC and TiC Put the agate balls at a ratio of 2:1 into a ball mill jar, then pour 40ml of absolute ethanol, and use a planetary ball mill to mill for 24 hours at a speed of 500r / min to obtain a uniformly mixed suspension;

[0044] (2) Transfer the obtained suspension to an eggplant-shaped flask and install it into a rotary steaming system, and rotate it at 60°C for 3 hours to obtain a semi-dry powder that is uniformly mixed, and then place the semi-dry powder in a drying oven Dry at 90°C for 24 hours, place it in an agate mortar and grind it by hand for 30 minutes and pass through a 200-mesh sieve to obtain a powder to be fired;

[0045] (3) Tra...

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Abstract

The invention discloses a ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material as well as a preparation method thereof. The ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material consists of elements Zr, Hf, Ta, Nb, Ti and C and is a single rock-salt-phase structure. The ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material is prepared by adopting a hot pressing and sintering technology. The prepared ZrHfTaNbTiC ultrahigh-temperature high-entropy ceramic material has excellent mechanical properties, and the hardness of the ceramic material reaches up to 38.52 to 41.25 GPa. The preparation method provided by the invention is simple in preparation process, high in efficiency and speed, low in synthetic temperature (1700 to 1900 DEG C), small in impressed pressure (20 to 30 MPa), low in energy consumption, safe, and environmentally friendly, has significant characteristics of repeatability and high reliability and the like, and can be applied to the industrial production.

Description

technical field [0001] The invention belongs to the technical field of ultra-high-temperature materials and their preparation, and in particular relates to a ZrHfTaNbTiC ultra-high-temperature and high-entropy ceramic material and a preparation method thereof. Background technique [0002] Multi-principal high-entropy materials are materials prepared with the concept of entropy stabilization. Multi-principal high-entropy materials generally contain 5 or more elements that are thermodynamically chaotically distributed in the material system, and the content of each element is between 5% and 35%. %. The high entropy effect caused by multiple principal elements can effectively improve the thermodynamic stability of the material, reduce the sintering temperature of the material, facilitate the formation of a simple crystal phase, and endow the material with rich performance adjustment space. In addition, the solid solution strengthening mechanism brought about by multi-principa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5607C04B35/622C04B2235/3817C04B2235/3839C04B2235/3843C04B2235/96
Inventor 褚衍辉叶贝琳刘达敬思怡
Owner SOUTH CHINA UNIV OF TECH
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