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ZrB2-SiC eutectic composite ceramic solidification preparation method

A composite ceramic and zrb2-sic technology, which is applied to ZrB2-SiC eutectic composite ceramic materials to prepare high-density boride eutectic composite ceramics. The effect of uniformity and large processing area

Active Publication Date: 2017-08-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to overcome the problem that the current traditional solidification method to prepare eutectic composite ceramics cannot reach extremely high temperature by crucible smelting, and to further increase the temperature gradient in the directional solidification process and refine the structure, the present invention proposes a ZrB 2 -Directional solidification preparation method of SiC eutectic composite ceramics

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  • ZrB2-SiC eutectic composite ceramic solidification preparation method

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Embodiment 1

[0040] This embodiment is a ZrB 2 -Directional solidification preparation method of SiC material. In this example, ZrB was prepared by laser horizontal zone melting high gradient directional solidification technology 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0041] Step 1, prepare ZrB 2 - SiC eutectic composite ceramic prefabricated powder. Commercially available powdered ZrB with a purity of 99.9% 2 and SiC as raw materials, according to ZrB 2 - The eutectic composition of SiC is prepared as base metal raw material; the ZrB 2 -The eutectic composition of SiC is 38.5~44.5mol%ZrB 2 -55.5~61.5mol% SiC; In this embodiment, ZrB 2 is 38.5 mol%, and SiC is 61.5 mol%. Add 20ml of polyvinyl alcohol binder and 60ml of absolute ethanol to every 100g of base metal raw materials, stir evenly by hand, and let it stand for 5 minutes; the preparation method of the polyvinyl alcohol binder is 100ml of distilled water+5g of polyvi...

Embodiment 2

[0049] This embodiment is a method for preparing high-density ZrB 2 - SiC material method. In this example, ZrB was prepared by laser horizontal zone melting high gradient directional solidification technology 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0050] This embodiment is a ZrB 2 -Directional solidification preparation method of SiC material. In this example, ZrB was prepared by laser horizontal zone melting high gradient directional solidification technology 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0051] Step 1, prepare ZrB 2 - SiC eutectic composite ceramic prefabricated powder. Commercially available powdered ZrB with a purity of 99.9% 2 and SiC as raw materials, according to ZrB 2 - The eutectic composition of SiC is prepared as base metal raw material; the ZrB 2 -The eutectic composition of SiC is 38.5~44.5mol%ZrB 2 -55.5~61.5mol% SiC; In this e...

Embodiment 3

[0059] This embodiment is a ZrB 2 -Directional solidification preparation method of SiC material. In this example, ZrB was prepared by laser horizontal zone melting high gradient directional solidification technology 2 - SiC eutectic ceramic composite material, its specific process includes the following steps:

[0060] Step 1, prepare ZrB 2 - SiC eutectic composite ceramic prefabricated powder. Commercially available powdered ZrB with a purity of 99.9% 2 and SiC as raw materials, according to ZrB 2 - The eutectic composition of SiC is prepared as base metal raw material; the ZrB 2 -The eutectic composition of SiC is 38.5~44.5mol%ZrB 2 -55.5~61.5mol% SiC; In this embodiment, ZrB 2 is 44.5 mol%, and SiC is 55.5 mol%. Add 20ml of polyvinyl alcohol binder and 60ml of absolute ethanol to every 100g of base metal raw materials, stir evenly by hand, and let it stand for 5 minutes; the preparation method of the polyvinyl alcohol binder is 100ml of distilled water+5g of polyvi...

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Abstract

The invention discloses a ZrB2-SiC eutectic composite ceramic directional solidification preparation method. A laser beam of a high-energy CO2 laser device serves as a heating source, ZrB2-SiC composite ceramics of eutectic components are rapidly zone-melted by small light spots, and a melting zone is stabilized by accurately controlling laser power and scanning rate, rapidly cooled and continuously solidified to obtain an anisotropic ZrB2-SiC eutectic composite ceramic with a refined structure and phase distribution uniformity. The microstructure of the obtained ZrB2-SiC eutectic composite ceramic is a labyrinth laminated eutectic structure. Compared with a ZrB2-SiC composite ceramic obtained by conventional sintering preparation technology, the ZrB2-SiC eutectic composite ceramic has the advantages that two phases of the structure are firmly combined, the structure is refined, a phase interface is clean, intergranular amorphous phases are avoided, and mechanical property can be further improved.

Description

technical field [0001] The invention relates to a method for preparing high-density boride eutectic composite ceramics, which belongs to the field of ultra-high-temperature composite ceramic materials, and specifically adopts a laser horizontal zone melting high-gradient directional solidification method to prepare high-density (relative density>99%) and fine-grained ceramics. ZrB 2 - SiC eutectic composite ceramic material. Background technique [0002] UHTZrB 2 Ceramics have a high melting point (T m =3518K), high hardness (H v =20-23GPa), excellent thermal conductivity (λ=60-100W·m -1 ·K -1 ), anti-ablation performance and low density (ρ=6.12g / cm 3 ), is an important candidate material for high-temperature thermal protection devices such as reciprocating aircraft, but its easy oxidation at high temperatures greatly limits its wide application in the aerospace field. Studies have shown that the addition of SiC can not only improve its high temperature oxidation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/64
CPCC04B35/58078C04B35/64C04B2235/3813C04B2235/3826C04B2235/665C04B2235/96
Inventor 苏海军曹业伟张军杜雅文郭敏刘林李雨恬傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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