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Preparation method of ZrB2-SiC eutectic ceramic with oriented lamellar structure

A eutectic ceramic, zrb2-sic technology, applied in the field of preparation of boride eutectic composite ceramics, can solve the problems of inability to reach extremely high temperature, difficult to control growth orientation, uneven structure distribution, etc., and achieve anisotropy of physical properties , the effect of improving mechanical properties and microstructure refinement

Active Publication Date: 2018-06-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Preparation of ZrB to overcome prior art 2 -In the process of SiC composite ceramics, there are many weak bonding surfaces, uneven tissue distribution, difficult to control the growth orientation, and the traditional solidification method to prepare eutectic composite ceramics using crucible melting and can not reach extremely high temperature. The present invention proposes an orientation layer. sheet-organized ZrB 2 -SiC eutectic ceramic preparation method

Method used

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  • Preparation method of ZrB2-SiC eutectic ceramic with oriented lamellar structure
  • Preparation method of ZrB2-SiC eutectic ceramic with oriented lamellar structure
  • Preparation method of ZrB2-SiC eutectic ceramic with oriented lamellar structure

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Embodiment 1

[0037] This embodiment is a ZrB with oriented lamellar structure 2 -Preparation method of SiC eutectic ceramics. In this example, ZrB was prepared by using an optical focusing zone melting device. 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0038] Step 1, Weighing: Weigh 32% ZrB 2 powder and 68% SiC powder, the stated percentages are mass percentages. The ZrB 2 Both the purity of the powder and the purity of the SiC powder are 99.9%, and the particle diameters are both 1-2 μm.

[0039] Step 2, ingredients: ZrB weighed 2 Add 20ml of polyvinyl alcohol binder and 60ml of absolute ethanol to the powder and SiC powder, and stir evenly; let it stand for 5 minutes to obtain the mixed raw material to be ball milled. The preparation method of the polyvinyl alcohol binder is 100ml distilled water+5g polyvinyl alcohol.

[0040] Step 3, ball milling: the obtained mixed raw materials to be ball milled are poured into a rubber bal...

Embodiment 2

[0051] This embodiment is a ZrB with oriented lamellar structure 2 -Preparation method of SiC eutectic ceramics. In this example, ZrB was prepared by using an optical focusing zone melting device. 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0052] Step 1, Weighing: Weigh 34%% ZrB 2 Powder and 66% SiC powder, the percentages mentioned are mass percentages. The ZrB 2 Both the purity of the powder and the purity of the SiC powder are 99.9%, and the particle diameters are both 1-2 μm.

[0053] Step 2, ingredients: ZrB weighed 2 Add 20ml of polyvinyl alcohol binder and 60ml of absolute ethanol to the powder and SiC powder, and stir evenly; let it stand for 5 minutes to obtain the mixed raw material to be ball milled. The preparation method of the polyvinyl alcohol binder is 100ml distilled water+5g polyvinyl alcohol.

[0054] Step 3, ball milling: the obtained mixed raw materials to be ball milled are poured into a rubber...

Embodiment 3

[0065] This embodiment is a ZrB with oriented lamellar structure 2 -Preparation method of SiC eutectic ceramics. In this example, ZrB was prepared by using an optical focusing zone melting device. 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0066] Step 1, Weighing: Weigh 35%% ZrB 2 powder and 65% SiC powder, the stated percentages are mass percentages. The ZrB 2 Both the purity of the powder and the purity of the SiC powder are 99.9%, and the particle diameters are both 1-2 μm.

[0067] Step 2, ingredients: ZrB weighed 2 Add 20ml of polyvinyl alcohol binder and 60ml of absolute ethanol to the powder and SiC powder, and stir evenly; let it stand for 5 minutes to obtain the mixed raw material to be ball milled. The preparation method of the polyvinyl alcohol binder is 100ml distilled water+5g polyvinyl alcohol.

[0068] Step 3, ball milling: the obtained mixed raw materials to be ball milled are poured into a rubber ba...

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Abstract

The invention relates to a preparation method of a ZrB2-SiC eutectic ceramic with oriented lamellar structure. The method includes: mixing high purity ZrB2 powder with SiC powder, and conducting mechanical ball milling and oil pressure compression of the matrix to obtain a vacuum argon protective atmosphere sintered compact ZrB2-SiC eutectic ceramic perform; and carrying out continuous directionalsolidification on the obtained ZrB2-SiC eutectic ceramic perform by optical focusing floating zone melting technology, thus obtaining the ZrB2-SiC eutectic ceramic with an oriented lamellar structure. The method provided by the invention utilizes optical focusing floating zone melting technology to prepare the ZrB2-SiC eutectic ceramic material, realizes rapid directional solidification of ZrB2-SiC eutectic composite ceramic without crucible constraint under the circumstances of high temperature gradient (-5000K / cm) and a large solidification rate range, completely eliminates pollution and cracks caused by the traditional directional solidification crucibles, and acquires the ZrB2-SiC eutectic ceramic material with ultrafine structure, even distribution and oriented lamellar structure.

Description

technical field [0001] The invention relates to the technical field of ultra-high temperature composite ceramic materials, and relates to a method for preparing boride eutectic composite ceramics with oriented lamellar structure. Background technique [0002] ZrB 2 Based ultra-high temperature ceramics are known for their high melting point (T m =3518K), low density (ρ=6.12g / cm 3 ), high thermal conductivity (λ=60-100Wm -1 ·K -1 ), excellent thermal shock resistance and ablation resistance, and other comprehensive properties, it is widely used in nose cones, wing leading edges of hypersonic vehicles, and hot ends of rocket propulsion systems. However, its easy oxidation at high temperature greatly limits its application in this field. Studies have shown that the addition of SiC can not only improve its high temperature oxidation resistance, but also improve the flexural strength (750MPa) and fracture toughness (6MPa m 1 / 2 ), therefore, ZrB 2 -SiC ultra-high temperatur...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
CPCC04B35/565C04B35/622C04B2235/3813
Inventor 苏海军杜雅文张军郭敏刘林傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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