Method for preparing super high temperature complex phase ceramic ZrB2-ZrC-SiC near to zero ablation

A technology of multiphase ceramics, zrb2-zrc-sic, applied in the field of special ceramics, can solve the problems of low production efficiency, poor thermal shock resistance, low sintering activity, etc. Effect

Active Publication Date: 2008-12-03
ZHONGCAI HIGH NEW MATERIAL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] ZrB 2 , ZrC, and SiC materials are covalently bonded compounds with extremely strong bond energy, high melting point, and low sintering activity. It is difficult to densify them by traditional sintering methods. Hot pressing has the following problems: (1) low production efficiency and high cost; (2) only products with simple shapes can be prepared, and the adaptability is poor; (3) there is a large difference in the axial and transverse properties of the product, and the ablation rate is high. Poor thermal shock resistance; etc., can not meet the actual requirements

Method used

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  • Method for preparing super high temperature complex phase ceramic ZrB2-ZrC-SiC near to zero ablation
  • Method for preparing super high temperature complex phase ceramic ZrB2-ZrC-SiC near to zero ablation
  • Method for preparing super high temperature complex phase ceramic ZrB2-ZrC-SiC near to zero ablation

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Embodiment 1

[0020] Ultra-high temperature near-zero ablation ZrB described in the present invention 2 -The preparation method of ZrC-SiC composite phase ceramics, carry out according to the following steps:

[0021] ZrB by weight 2 , ZrC and SiC and additional ZrO 2 60%, 25% and 15%, plus 12% to weigh the powder, the median particle size of the four powders are: 1.5μm, 1.3, 1.0μm and 0.5μm, using deionized water as a dispersant, Ball milling, 25KHz ultrasonic dispersion, and granulation through a centrifugal drying granulator after passing through a 300-mesh sieve. The feeding speed is 8Kg / h, the drying temperature is 200°C, and the particle size of the granulated material is 0.5-2mm. Then evenly put it into a special oil-resistant rubber abrasive tool, and shape it in a wet isostatic press with a maximum pressure of 180MPa. The formed samples were put into a pressureless sintering furnace protected by argon gas and fired at a maximum firing temperature of 1800°C for 2 hours. Let it c...

Embodiment 2

[0023] ZrB by weight 2 , ZrC and SiC and additional ZrO 2 50%, 35% and 15% respectively, plus 12% to weigh the powder, and the others are the same as in Example 1. The properties are shown in Table 1.

Embodiment 3

[0025] ZrB by weight 2 , ZrC and SiC and additional ZrO 2 70%, 20% and 10% respectively, plus 12% to weigh the powder, and the others are the same as in Example 1. The properties are shown in Table 1.

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Abstract

This invention relates to a method for preparing ZrB2-ZrC-SiC multiphase ceramic at ultrahigh temperatures with near-zero ablation. The ZrB2-ZrC-SiC multiphase ceramic is prepared from: ZrB2 50-75 wt.%, ZrC 15-40 wt.%, SiC 10-20 wt.%, and ZrO2 as the combustion aid 6-16 wt.%. The ZrB2-ZrC-SiC multiphase ceramic has synergistic effects at high temperatures, which can result in good high-temperature properties. The ZrB2-ZrC-SiC multiphase ceramic has a room-temperature bending strength of 300-400 MPa, a Rockwell hardness of 88-92, and a linear ablation of 0.0003-0.001 mm / s. The ZrB2-ZrC-SiC multiphase ceramic has better oxidation resistance, better ablation resistance and lower sintering temperature compared with single phase ceramics, and has such advantages as good applicability, even distribution, no limit to product shapes and little shape change after 2400 s oxygen-ethylene combustion at 2800-3200 deg.C.

Description

technical field [0001] The invention relates to an ultra-high temperature near-zero ablation ZrB 2 - The preparation method of ZrC-SiC composite ceramics belongs to the technical field of special ceramics. Background technique [0002] When aviation and aerospace vehicles fly at high speed in the atmosphere, due to the friction of the surface by the atmospheric air flow, severe aerodynamic heating will be generated on the thermal protection material. With the increase of the Mach number, the heat protection technology of the aircraft becomes more and more important, especially the higher and higher requirements are put forward for the materials used in the nose cone cap, wing leading edge, tail cone, etc. The demand for ultra-high temperature materials with high temperature above ℃ and long-term non-oxidation and ablation, good wear resistance and thermal shock resistance is becoming more and more urgent. [0003] The currently used ultra-high temperature materials mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/515C04B35/622
Inventor 周长灵王重海程之强孙成功
Owner ZHONGCAI HIGH NEW MATERIAL
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