A method for large-scale preparation of hfo2-tho2 ultra-high temperature oxide composite ceramics

A composite ceramic and ultra-high temperature technology, which is applied in the field of large-scale preparation of HfO2-ThO2 ultra-high temperature oxide composite ceramics, can solve the problems of difficult sintering, low production efficiency, and complicated process of composite ceramics, and reduce the production cost. cost, porosity reduction, and bulk density enhancement

Active Publication Date: 2022-05-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For HfO 2 -ThO 2 The sintering of multi-phase ceramics is difficult. When the existing sintering method reaches high density, the process is complicated, the cost is high, the production efficiency is low, and it is difficult to produce large-scale production. HfO 2 -ThO 2 Method for Ultra-High Temperature Oxide Composite Ceramics

Method used

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  • A method for large-scale preparation of hfo2-tho2 ultra-high temperature oxide composite ceramics
  • A method for large-scale preparation of hfo2-tho2 ultra-high temperature oxide composite ceramics
  • A method for large-scale preparation of hfo2-tho2 ultra-high temperature oxide composite ceramics

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Experimental program
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Embodiment 1

[0128] 1) with HfO 2 (Shanghai McLean Biochemical Technology Co., Ltd., purity 99.99%) and ThO 2 (Shandong Dengnuo New Material Technology Co., Ltd.) is the matrix material of composite ceramics, and HfO in composite ceramics 2 with ThO 2 The ratio is fixed at 19:1 (molar ratio), and 3 at%Al is added 2 o 3 The powder is ball-milled, poured into absolute ethanol as the ball-milling medium, and milled for 12 hours using a drum-type ball mill at a speed of 50 r / min, dried at 50°C for 24 hours, and passed through a 200-mesh sieve;

[0129] 2) According to the mass ratio of powder: solution = 25:0.9~1.1, add PVA aqueous solution with a mass concentration of 2% to the powder, and grind it evenly in an alumina grinding body, pass through a 40-mesh sieve and let it stand overnight;

[0130] 3) Take about 26g of powder and place it in a φ30mm cemented carbide mold (the material is YG8, Renqiu Tengxin Mold Co., Ltd.), pressurize at a constant speed to the maximum pressure of 110MPa,...

Embodiment 2

[0143] 1) with HfO 2 (Shanghai McLean Biochemical Technology Co., Ltd., purity 99.99%) and ThO 2 (Shandong Dengnuo New Material Technology Co., Ltd.) is the matrix material of composite ceramics, and HfO in composite ceramics 2 with ThO 2 The ratio is fixed at 19:1 (molar ratio), and 3 at% CaO powder is added for ball milling, poured into absolute ethanol as the ball milling medium, using a drum mill at a speed of 50r / min for 12h, and drying at 50°C for 24h , through a 200-mesh sieve;

[0144] 2) According to the mass ratio of powder: solution = 25:0.9~1.1, add PVA aqueous solution with a mass concentration of 2% to the powder, and grind it evenly in an alumina grinding body, pass through a 40-mesh sieve and let it stand overnight;

[0145] 3) Take about 26g of powder and place it in a φ30mm cemented carbide mold (the material is YG8, Renqiu Tengxin Mold Co., Ltd.), pressurize at a constant speed to the maximum pressure of 110MPa, and hold the pressure for 120s;

[0146] 4...

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Abstract

The invention discloses a large-scale preparation of HfO 2 ‑ThO 2 The method for ultra-high temperature oxide composite phase ceramics comprises the following steps: HfO 2 Powder, ThO 2 powder and sintering additives are mixed to obtain mixed powder, granulated to obtain powder, and the powder is molded to obtain a composite ceramic green body, and then sintered in an oxidizing atmosphere to obtain HfO 2 ‑ThO 2 Ultra-high temperature composite phase ceramics; the compression molding adopts secondary pressure holding; the invention provides a kind of HfO under normal pressure for the first time 2 ‑ThO 2 A method for sintering and densifying ultra-high temperature oxide multi-phase ceramics. The inventors found that in the presence of sintering aids, the green body obtained by using the second pressure during the pressing process can be sintered in an oxidizing atmosphere to obtain a dense HfO 2 ‑ThO 2 Ultra-high temperature oxide composite ceramics. The preparation method of the present invention can realize low-cost and large-scale production because the sintering is carried out under normal pressure without special equipment.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic materials, in particular to a large-scale preparation of HfO 2 -ThO 2 A method for ultra-high temperature oxide composite ceramics. Background technique [0002] Hypersonic aircraft refers to aircraft with a flight speed exceeding Mach 5 (that is, 5 times the speed of sound). Due to its characteristics of fast flight and response speed, strong maneuverability and penetration capabilities, the flight altitude is in the near-space area of ​​20km to 100km from the ground. , has extremely high commercial and military application value. However, when a hypersonic vehicle continues to fly in the atmosphere, due to strong air compression, friction between the outer surface of the body and the atmosphere, and viscous dissipation, the temperature of the air in the flow field will increase significantly, resulting in an extremely harsh If the heat cannot be prevented from eroding the main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/482C04B35/622C04B35/64
CPCC04B35/482C04B35/622C04B35/64C04B2235/32C04B2235/3217C04B2235/3208C04B2235/3251C04B2235/3418C04B2235/6562C04B2235/6567C04B2235/96C04B2235/77
Inventor 孙威楚宇昊熊翔张红波
Owner CENT SOUTH UNIV
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