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A preparation method of oxide toughened ablation-resistant high-entropy carbonitride ceramics

A carbonitride and oxide technology, which is applied in the field of preparation of ablation-resistant high-entropy carbonitride ceramics, and achieves the effects of best high temperature stability, wide selection range, low line ablation rate and mass ablation rate

Active Publication Date: 2022-05-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention discloses a preparation method of oxide-toughened ablation-resistant high-entropy carbonitride ceramics to solve any problems in the prior art or other potential problems

Method used

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  • A preparation method of oxide toughened ablation-resistant high-entropy carbonitride ceramics
  • A preparation method of oxide toughened ablation-resistant high-entropy carbonitride ceramics
  • A preparation method of oxide toughened ablation-resistant high-entropy carbonitride ceramics

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Experimental program
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Effect test

Embodiment 1

[0044] Oxide-toughened ablation-resistant high-entropy carbonitride ceramics (Ti 0.2 Zr 0.2 f 0.2 Nb 0.2 Ta 0.2 )(C 0.44 N 0.44 o 0.12 ) preparation:

[0045] Weigh 9.982g of NbC powder, 29.393g of TaC powder, 14.509g of HfC powder, 9.425g of TiN powder, 16.03g of ZrN powder, 14.661g of HfN powder in the glove box, and weigh Nb 2 o 5 Mix 6g of powder into a ball mill jar and mill at a speed of 300rpm for 60 hours. During the process, the ball mill jar needs to be opened every 10 hours in the glove box to break the sticky wall material in the jar. During the ball milling process, some high-entropy ceramic powders undergo solid solution to form a multiphase solid solution. figure 1 , the black line 2 is (Ti 0.2 Zr 0.2 f 0.2 Nb 0.2 Ta 0.2 )(C 0.44 N 0.44 o 0.12 ) powder X-ray diffraction pattern.

[0046]Take 68.5g of the above powder and fill it into a graphite abrasive tool with a diameter of 30mm, place it in a spark plasma sintering furnace, the vacuum degre...

Embodiment 2

[0049] Oxide-toughened ablation-resistant high-entropy carbonitride ceramics (Ti 0.2 Zr 0.2 f 0.2 Nb 0.2 Ta 0.2 )(C 0.47 N 0.47 o 0.6 ) preparation:

[0050] Weigh 12.982g of NbC powder, 29.393g of TaC powder, 14.509g of HfC powder, 9.425g of TiN powder, 16.03g of ZrN powder, 14.661g of HfN powder in the glove box, and weigh Nb 2 o 5 Mix 3g of powder into a ball mill jar, and mill at a speed of 300rpm for 60 hours. During the process, the ball mill jar needs to be opened every 10 hours in the glove box to break the sticky wall material in the jar. During the ball milling process, some high-entropy ceramic powders undergo solid solution to form a multiphase solid solution.

[0051] Take 68.5g of the above powder and fill it into a graphite abrasive tool with a diameter of 30mm, place it in a spark plasma sintering furnace, the vacuum degree is less than 100Pa, the set pressure is 30Mpa, the heating rate is 100℃ / min, the temperature is raised to 2000℃, and the temperatu...

Embodiment 3

[0054] Oxide-toughened ablation-resistant high-entropy carbonitride ceramics (Ti 0.2 Zr 0.2 f 0.2 Nb 0.2 Ta 0.2 )(C 0.41 N 0.41 o 0.18 ) preparation:

[0055] Weigh 6.982g of NbC powder, 29.393g of TaC powder, 14.509g of HfC powder, 9.425g of TiN powder, 16.03g of ZrN powder, 14.661g of HfN powder in the glove box, and weigh Nb 2 o 5 Mix 9g of powder into a ball mill jar, and mill at a speed of 300rpm for 60 hours. During the process, the ball mill jar needs to be opened every 10 hours in the glove box to break the sticky wall material in the jar. During the ball milling process, some high-entropy ceramic powders undergo solid solution to form a multiphase solid solution.

[0056] Take 68.5g of the above powder and fill it into a graphite abrasive tool with a diameter of 30mm, place it in a spark plasma sintering furnace, the vacuum degree is less than 100Pa, the set pressure is 30MPa, the heating rate is 100℃ / min, the temperature is raised to 2000℃, and the temperatu...

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Abstract

The invention belongs to the technical field of high-entropy ceramics, and in particular relates to a preparation method of oxide-toughened ablation-resistant high-entropy carbonitride ceramics. The oxygen element of the invention is represented by Nb 2 o 5 into high-entropy carbonitride ceramics, but will end up as ZrO 2 In this process, the oxides are refined and can be distributed in the high-entropy carbonitride ceramics as the second phase dispersed phase, which plays a toughening role. Mix the ceramic powder with an appropriate amount of Nb 2 o 5 Powder mixing, ball milling, and spark plasma sintering to prepare oxide-containing high-toughness, ablation-resistant, and high-entropy carbonitride ceramics. The hardness of the high-entropy carbonitride ceramics is as high as 25-35GPa, the elastic modulus is as high as 400-600GPa, and the fracture toughness is as high as 6-12MPa*m 1 / 2 , high melting point, good thermal stability, good ablation resistance, its line ablation rate is only 0.01‑0.07% mm / s, mass ablation rate is only 0.1‑0.3% g / s, thermal shock resistance, available High temperature protection materials in extreme environments.

Description

technical field [0001] The invention belongs to the technical field of high-entropy ceramics, and in particular relates to a preparation method of oxide-toughened ablation-resistant high-entropy carbonitride ceramics. Background technique [0002] With the rapid development of aerospace technology, hypersonic vehicles have become a sharp weapon for countries to seize strategic advantages in the air and space. In extreme environments such as long-term hypersonic cruising, transatmospheric flight, and atmospheric reentry, key components such as the leading edge of the aircraft's wings and the nose cone rub against the atmosphere violently during flight, resulting in high temperatures and thermal shocks of thousands of degrees Celsius. High performance thermal protection materials need to be developed. In particular, it has machinability at room temperature, that is, high fracture toughness, and long-term resistance to ablation and oxidation at temperatures as high as 3000 ° C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58C04B35/622C04B2235/96C04B2235/3251C04B2235/666C04B2235/3843C04B2235/3839C04B2235/3852C04B2235/6562C04B2235/6567
Inventor 刘雄军张盼王辉吴渊蒋虽合吕昭平
Owner UNIV OF SCI & TECH BEIJING