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RE2O3-added ZrB2-SiC composite ceramic material and preparation method thereof

A rare earth oxide and multiphase ceramic technology is applied in the field of rare earth oxide-added zirconium boride-silicon carbide multiphase ceramic materials and their preparation, which can solve the problems of reduced material properties and no significant improvement in other properties, and is easy to achieve. The effect of realizing, simple preparation process and low price

Inactive Publication Date: 2013-03-20
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Add metal or ceramic additives (Ni, Si 3 N 4 , WC, ZrN) can reduce the sintering temperature and increase the densification of the material, but it does not significantly improve other properties of the material, and even reduces the properties of the material, such as high temperature oxidation resistance and ablation performance

Method used

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  • RE2O3-added ZrB2-SiC composite ceramic material and preparation method thereof
  • RE2O3-added ZrB2-SiC composite ceramic material and preparation method thereof
  • RE2O3-added ZrB2-SiC composite ceramic material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] ZrB 2 powder (14μm, >97%), SiC powder (0.45μm, >97%) and ytterbium oxide powder (Yb 2 o 3 , 99%) as the raw material, according to the sintering aid Yb 2 o 3 The volume content of SiC is 3%, the volume content of SiC is 20%, and the volume content of ZrB 2 The volume content is 78% batching, acetone is used as solvent, silicon nitride ball is used as ball milling medium, planetary ball milling is carried out at a speed of 560 rpm for 8 hours, and the obtained slurry is dried by rotary evaporation to obtain a uniformly mixed powder.

[0023] Put the uniformly mixed powder in a graphite mold coated with BN on the inner wall surface, and perform hot-press sintering. The heating rate at the beginning of hot-pressing sintering is 8°C / min. The temperature is 15°C / min, the temperature is raised to 1900°C, and the pressure of 30MPa is hot-pressed and sintered for 1 hour to obtain a bulk material with a relative density close to 100%. The microscopic appearance of the mater...

Embodiment 2

[0025] Design Yb 2 o 3 The volume content in the matrix is ​​1%, and the material is prepared according to the method of Example 1, and the relative density of the obtained sample is greater than 99%.

Embodiment 3

[0027] Design Yb 2 o 3 The volume content in the matrix is ​​3%, the material is prepared according to the method of Example 1, and the sintering temperature is changed to 1700°C, and the relative density of the obtained sample is 99%.

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Abstract

The invention relates to an RE2O3-added ZrB2-SiC composite ceramic material and a preparation method thereof. According to the preparation method, with ZrB2 powder and SiC powder of which the purities are not lower than 97 percent as raw materials and RE2O3 of which the purity is not lower than 99 percent as an additive and the volume fraction is 0.1-10 percent by volume, the raw materials and the additive are mixed to prepare the material with different components. After being subjected to ball grinding and drying, the raw materials are subjected to hot pressed sintering at the temperature of 1700-1900 DEG C by adjusting the sintering process parameters to obtain the ZrB2-SiC composite ceramic. The prepared RE2O3-added ZrB2-SiC composite ceramic material has the relative density of being larger than 99 percent, the bending strength of 800-1000MPa, the breaking tenacity of 4.5-6MPa.M<1 / 2>, the hardness of 15-20GPa and the thermal conductivity of 80-100W.(m.K)<-1>, and is favorable in anti-oxidation ablation performance.

Description

technical field [0001] The invention belongs to the field of non-oxide structure ceramics, in particular to a rare earth oxide (RE 2 o 3 ) Zirconium boride-silicon carbide (ZrB 2 -SiC) composite ceramic material and preparation method thereof, specifically, it is mainly based on lanthanide rare earth oxide RE 2 o 3 (RE is lanthanum, cerium, praseodymium, neodymium, europium, dysprosium, ytterbium, lutetium) as additives, using hot pressing sintering to obtain dense ZrB at a relatively low temperature 2 -SiC composite ceramics, the relative density of the material is greater than 99%, and the mechanical properties, thermal conductivity and oxidation resistance are good. Background technique [0002] The extreme environment in which hypersonic vehicles operate is characterized by ultra-high temperature (above 1800°C), highly corrosive atmosphere (such as oxygen atoms, plasma) and high airflow erosion. High-temperature structural ceramics based on silicon carbide or silico...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 郭伟明杨振国
Owner FUDAN UNIV
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