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Layered ZrB2 composite ceramic material and preparation method

A composite ceramic and layered technology, applied in the field of ceramic composite materials, can solve the problem of low toughness of bulk ceramics

Inactive Publication Date: 2019-07-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a layered ZrB 2 Composite ceramic material and preparation method to solve ZrB 2 The lack of application of bulk ceramics due to low toughness

Method used

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  • Layered ZrB2 composite ceramic material and preparation method
  • Layered ZrB2 composite ceramic material and preparation method
  • Layered ZrB2 composite ceramic material and preparation method

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Experimental program
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specific Embodiment 1

[0023] Specific embodiment 1: as figure 1 shown.

[0024] 1. Preparation of cast sheet: ①. Make 40-50 parts by weight of ZrB 2 Powder, 30-40 parts ethanol solvent, 2-4 parts triethyl phosphate dispersant, add ZrO 2 Mix in a ball mill tank at 60-100r / min for 12-24h to obtain a premixed liquid; ②, Plasticize 5-10 parts by weight of polyvinyl butyral binder and 2-4 parts of glycerol The casting agent is added to the premixed solution and mixed for 12-24 hours to obtain the casting slurry; ③, the casting slurry is subjected to vacuum defoaming, and the height of the scraper before and after the casting machine is adjusted, and ZrB is obtained after casting, drying, and demoulding. 2 Ceramic flakes.

[0025] 2. Preparation of layered prefabricated body: ① Cut the ceramic film, alternately stack it with Ti foil, and dry press it at 5-10MPa to obtain a ceramic preformed body of corresponding size; ② Put the preformed body after dry pressing Put it into an oven at 100-200° C. for ...

specific Embodiment 2

[0027] Specific embodiment 2: as figure 2 shown.

[0028] 1. Preparation of cast sheet: ①. Make 40-50 parts by weight of ZrB 2 Powder, 30-40 parts ethanol solvent, 2-4 parts triethyl phosphate dispersant, add ZrO 2 Mix in a ball mill tank at 60-100r / min for 12-24h to obtain a premixed liquid; ②, Plasticize 5-10 parts by weight of polyvinyl butyral binder and 2-4 parts of glycerol The casting agent is added to the premixed solution and mixed for 12-24 hours to obtain the casting slurry; ③, the casting slurry is subjected to vacuum defoaming, and the height of the scraper before and after the casting machine is adjusted, and ZrB is obtained after casting, drying, and demoulding. 2 Ceramic flakes.

[0029] 2. Preparation of layered prefabricated body: ① Cut the ceramic film, alternately stack it with Nb foil, and dry press it at 5-10MPa to obtain a ceramic preformed body of corresponding size; ② Put the preformed body after dry pressing Put it into an oven at 100-200° C. for...

specific Embodiment 3

[0031] Specific embodiment 3: as image 3 shown.

[0032] 1. Preparation of cast sheet: ①. Make 40-50 parts by weight of ZrB 2 Powder, 30-40 parts ethanol solvent, 2-4 parts triethyl phosphate dispersant, add ZrO 2 Mix in a ball mill tank at 60-100r / min for 12-24h to obtain a premixed liquid; ②, Plasticize 5-10 parts by weight of polyvinyl butyral binder and 2-4 parts of glycerol The casting agent is added to the premixed solution and mixed for 12-24 hours to obtain the casting slurry; ③, the casting slurry is subjected to vacuum defoaming, and the height of the scraper before and after the casting machine is adjusted, and ZrB is obtained after casting, drying, and demoulding. 2 Ceramic flakes.

[0033]2. Preparation of layered prefabricated body: ① Cut the ceramic film, alternately stack it with W foil, and dry press it under 5-10MPa to obtain a ceramic preformed body of corresponding size; ② Put the preformed body after dry pressing Put it into an oven at 100-200° C. for...

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Abstract

The invention relates to a layered ZrB2 composite ceramic material and a preparation method. The preparation method comprises the following steps: (1) preparation of casting sheets; (2) preparation ofa layered ZrB2 prefabricated body, namely cutting a ZrB2 ceramic film obtained through drying and demolding, alternately laminating the film pieces with Ti foil, Nb foil, W foil or Mo foil of the same shape, and then carrying out dry pressing and low-temperature hot pressing; and (3) preparation of the layered ZrB2 composite ceramic material, namely performing rubber discharge on the layered ZrB2prefabricated body in a sintering furnace, and heating to a specified temperature for sintering, thereby obtaining the ZrB2 composite ceramic material with a layered structure. Compared with a single-block ZrB2 ceramic material, the layered ZrB2 composite ceramic material prepared by a discharge plasma method has the advantages that the toughness of layered ceramics is improved obviously by adding a high-melting-point metal layer as an intermediate layer; the shortcomings such as high brittleness and poor practicability and reliability of the single-block ZrB2 ceramic material are overcome, and the layered ZrB2 composite ceramic material has high promotion and application value.

Description

technical field [0001] The invention belongs to the field of ceramic composite materials and relates to a layered ZrB 2 Composite ceramic material and preparation method. Background technique [0002] Zirconium diboride (ZrB 2 ) is an ultra-high temperature ceramic material with ultra-high melting point, excellent hardness and stiffness, relatively low coefficient of thermal expansion and coefficient of thermal expansion, ideal for special applications such as hypersonic vehicles, nuclear industry components or nose cones of thermal protection systems Material. However, the inherent brittleness of ceramics often becomes a critical limitation for their applications. Once microcracks occur on the surface or inside of the material, catastrophic failure is very likely to occur, which greatly reduces the reliability of the material. In order to solve this problem, it is particularly important to improve the toughness of ceramics. In recent years, bionic structure design and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/76C04B35/58C04B35/622
CPCC04B35/58078C04B35/622C04B35/76C04B2235/404
Inventor 成来飞白钰航范尚武孙孟勇
Owner NORTHWESTERN POLYTECHNICAL UNIV