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a zrb 2 -Preparation method of zrc-sic nanocomposite ceramic material

A technology of nanocomposite and ceramic materials, which is applied in the field of preparation of ceramic matrix composite materials to achieve the effects of low cost, high fracture toughness and high element utilization

Active Publication Date: 2022-02-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the application of sol-gel method to prepare high-purity nano-scale ultra-high temperature ceramic powder has been widely used, but there are few reports on the combination of this method and sintering technology to prepare dense composite ceramics

Method used

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  • a zrb <sub>2</sub> -Preparation method of zrc-sic nanocomposite ceramic material
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  • a zrb <sub>2</sub> -Preparation method of zrc-sic nanocomposite ceramic material

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Embodiment 1

[0035] a ZrB 2 -The preparation method of ZrC-SiC nano-composite ceramic material, comprises the following steps:

[0036] Configuration of zirconium precursor solution: Weigh 3.2g of zirconium oxychloride for later use, dissolve zirconium oxychloride in 30mL of absolute ethanol, add 6.8g of 30% H 2 o 2 and 0.3g PEG6000, stirred evenly in a water bath at 65°C to obtain a zirconium precursor solution;

[0037] Configuration of the silicon precursor solution: according to the molar ratio of zirconium oxychloride to ethyl orthosilicate 1:0.7, weigh 1.5g of ethyl orthosilicate and dissolve it in 20mL of absolute ethanol, and stir evenly to obtain the silicon precursor solution;

[0038] Preparation of boron precursor solution: According to the molar ratio of zirconium oxychloride and boric acid as 1:2.5, weigh 1.55g of boric acid and dissolve it in 30mL of absolute ethanol, and stir evenly in a water bath at 50°C to obtain a boron precursor solution;

[0039] Preparation of car...

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Abstract

Provides a ZrB 2 ‑ZrC‑SiC nanocomposite ceramic material preparation method: prepare zirconium source solution, boron source solution, silicon source solution and carbon source solution respectively; mix the four solutions to obtain the target precursor solution; then dry and grind; then ball mill and mix ; Finally, through cold pressing, isostatic pressing densification, and pressureless sintering, the ZrB 2 ‑ZrC‑SiC nanocomposite ceramic material, the resulting material is ZrB by volume ratio 2 : ZrC: SiC ratio is: (64‑16): (64‑16): 20; the ZrB 2 , ZrC is a grain with an average particle size of 90-110nm; the SiC is a mixed phase of particles, whiskers and nanowires, and its preparation method is.

Description

technical field [0001] The present invention generally relates to the technical field of preparation of ceramic matrix composite materials, in particular to a ZrB 2 -The preparation method of ZrC-SiC nano-composite ceramic material. Background technique [0002] Ultra-high temperature-resistant ceramic matrix composites are a new type of thermal protection material that can withstand extreme environments such as long-term, transatmospheric flight and reentry of hypersonic vehicles. Ultra-high temperature ceramic precursors are its key basic raw materials. [0003] ZrB 2 Base ceramics have a very high melting point, good chemical stability and physical properties, and excellent thermal shock resistance, and are widely used in high-temperature environments that are prone to oxidation and corrosion. The introduction of SiC phase can be oxidized at high temperature to form dense SiO 2 , filled in high strength ZrO 2 In the framework, glassy ZrO is formed on the surface of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/56C04B35/622
CPCC04B35/58078C04B35/5622C04B35/622C04B2235/3826C04B2235/5445C04B2235/5454C04B2235/5276C04B2235/5244
Inventor 周哲廖桓毅毛卫国陶创芳金鑫陈畅
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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