Ultrahigh-temperature high-entropy carbide powder and preparation method thereof

A carbide and ultra-high temperature technology, applied in the field of ultra-high temperature ceramic powder, can solve the problems of being unsuitable for large-scale production of ultra-high temperature and high entropy ceramic powder, and achieve the effects of low cost, wide source of raw materials and simple process

Inactive Publication Date: 2019-08-02
淄博星澳新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the above methods for preparing high-entropy ceramics either require high-energy ball milling or spark plasma sintering, and are not suitable for large-scale production of ultra-high-temperature high-entropy ceramic powders.

Method used

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  • Ultrahigh-temperature high-entropy carbide powder and preparation method thereof
  • Ultrahigh-temperature high-entropy carbide powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Raw material TiO 2 , ZrO 2 , HfO 2 , Nb 2 o 5 、WO 3 、 Ta 2 o 5 and carbon black in molar ratio TiO 2 ZrO 2 :HfO 2 :Nb 2 o 5 :WO 3 : Ta 2 o 5 :C=1:1:1:0.25:0.5:1:4 weighed, then placed in a zirconia mixing tank, added distilled water, mixed with zirconia balls at a speed of 100r / min for 48h, and then mixed evenly The raw materials were dried in a drying oven at a constant temperature of 80 °C for 72 h, and the dried raw material powder was put into a graphite crucible, heated to 1800 °C in a vacuum graphite furnace at a heating rate of 10 °C / min, kept for 2 h, and then The furnace is cooled to room temperature, and the powder obtained by grinding is an ultra-high temperature high-entropy carbide (Ti 0.2 Zr 0.2 f 0.2 Nb 0.1 W 0.1 Ta 0.2 ) C powder.

[0039] The X-ray diffraction spectrum of the prepared powder is as follows figure 1 As shown, it can be seen from the figure that the X-ray diffraction analysis shows that it is a pure ultra-high tempera...

Embodiment 2

[0041] Raw material TiO 2 , ZrO 2 , HfO 2 , Nb 2 o 5 、WO 3 、 Ta 2 o 5 and carbon black in molar ratio TiO 2 :ZrO 2 :HfO 2 :Nb 2 o 5 :WO 3 : Ta 2 o 5 : C=1.2:1.2:1.2:0.4:0.7:1.2:4.5 weighed, then placed in a zirconia mixing tank, added distilled water, mixed with zirconia balls at a speed of 150r / min for 36h, and then mixed evenly The raw material was dried in a drying oven at a constant temperature of 100°C for 64 hours, the dried raw material powder was put into a graphite crucible, heated to 1980°C in an argon graphite furnace at a heating rate of 15°C / min, and kept for 1 hour. With the furnace cooling to room temperature, the powder obtained by grinding is ultra-high temperature high-entropy carbide (Ti 0.2 Zr 0.2 f 0.2 Nb 0.1 W 0.1 Ta 0.2 ) C powder.

[0042] The transmission electron microscope image of the prepared powder is shown in figure 2 As shown, it can be seen from the figure that the transmission electron microscope analysis shows that it i...

Embodiment 3

[0044] Raw material TiO 2 , ZrO 2 , HfO 2 , Nb 2 o 5 、WO 3 、 Ta 2 o 5 and carbon black in molar ratio TiO 2 :ZrO 2 :HfO 2 :Nb 2 o 5 :WO 3 : Ta 2 o 5 : C=1.5:1.5:1.5:0.4:0.75:1.5:6 weighed, then placed in a zirconia mixing tank, added distilled water, mixed with zirconia balls at a speed of 120r / min for 40h, and then mixed evenly Dry the raw material in a drying oven at a constant temperature of 120°C for 24 hours, put the dried raw material powder into a graphite crucible, heat it to 1900°C at a heating rate of 15°C / min in an argon graphite furnace, and keep it for 1.5h , with the furnace cooling to room temperature, the powder obtained by grinding is ultra-high temperature high-entropy carbide (Ti 0.2 Zr 0.2 f 0.2 Nb 0.1 W 0.1 Ta 0.2 ) C powder.

[0045] The prepared powder was sintered at 2200 °C by discharge plasma to obtain ultra-high temperature and high entropy carbide ceramics (Ti 0.2 Zr 0.2 f 0.2 Nb 0.1 W 0.1 Ta 0.2 ) C bulk material, the rel...

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Abstract

The invention relates to the technical field of ultrahigh-temperature ceramic powder, in particular to ultrahigh-temperature high-entropy carbide powder and a preparation method thereof. The ultrahigh-temperature high-entropy carbide powder adopts a chemical formula as follows: (Ti0.2Zr0.2Hf0.2Nb0.1W0.1Ta0.2) C, and is prepared from TiO2, ZrO2, HfO2, Nb2O5, WO3, Ta2O5 and carbon black as raw materials through wet mixing and a high-temperature carbothermal reduction reaction. The ultrahigh-temperature high-entropy carbide powder is small in grain size, low in heat conductivity and good in hightemperature stability, and is suitable to be used as a base material of an ultrahigh-temperature heat-resistant coating material, an ultrahigh-temperature heat-insulating material and an ultrahigh-temperature composite material; by the preparation method, a technology is simple, the raw material cost is low, and the high-purity ultrahigh-temperature high-entropy carbide powder can be obtained through once heating at relatively low temperature.

Description

technical field [0001] The invention relates to the technical field of ultra-high temperature ceramic powder, in particular to an ultra-high temperature high-entropy carbide powder and a preparation method thereof. Background technique [0002] The first wall of the tokmak, the combustion chamber of the solid rocket motor, the combustion chamber of the scramjet, and the surface of the hypersonic vehicle all face ultra-high temperature environments, and thermal protection measures are required. [0003] Transition metal boride and carbide ultra-high temperature ceramics have the advantages of high melting point, low density, high hardness, high strength, and environmental corrosion resistance, and are key candidates for thermal protection applications in extreme environments. However, the high thermal conductivity of transition metal borides and carbides ultra-high temperature ceramics cannot play the role of thermal protection and heat insulation at the same time. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/626
CPCC04B35/5607C04B35/62625C04B35/6265C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3258C04B2235/785C04B2235/77C04B2235/96C04B2235/9607
Inventor 吴事江蒋丹宇巩玉贤李拯杨焕顺林杨
Owner 淄博星澳新材料研究院有限公司
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