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

A complex phase ceramic, zrb2-zrc-sic technology, applied in the field of special ceramics, can solve the problems of low sintering activity, low production efficiency, poor thermal shock resistance, etc., achieve lower sintering temperature, increase production efficiency, and good adaptability Effect

Active Publication Date: 2007-02-21
ZHONGCAI HIGH NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 of the present invention 2 -The preparation method of ZrC-SiC composite ceramics is carried out according to the following steps:

[0021] The proportion by weight is ZrB 2 , ZrC and SiC and additional ZrO 2 Respectively 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 mill mixing, 25KHz ultrasonic dispersion uniformly, after passing through a 300-mesh sieve, granulate by centrifugal drying granulator, feeding speed is 8kg / h, drying temperature is 200℃, and granulated material particle size 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 sample is fired in a pressureless sintering furnace protected by argon gas, the highest firing temperature is 1800°C, and the temperature is kept for 2 hours....

Embodiment 2

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

Embodiment 3

[0025] The proportion by weight is ZrB 2 , ZrC and SiC and additional ZrO 2 Respectively 70%, 20% and 10%, plus 12% to weigh the powder, the others are the same as in Example 1. The performance is 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 method for preparing 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, the surface is frictionally affected by atmospheric air currents, causing severe aerodynamic heating on the thermal protection material. With the increase of Mach number, the thermal protection technology of aircraft has become more and more important, especially the materials used in the nose cone cap, wing leading edge, tail cone, etc. have put forward higher and higher requirements, which can withstand 2000 The demand for ultra-high temperature materials with high temperature above ℃ and long-term action without oxidation and ablation, good wear resistance and thermal shock resistance is becoming more and more urgent. [0003] The ultra-high temperature materials currently us...

Claims

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Application Information

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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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