Preparation method of ZrB2-ZrC-SiC nano composite ceramic material

A nano-composite, ceramic material technology is applied in the field of ceramic matrix composite material preparation, and achieves the effects of good application prospect, good mechanical and ablation resistance, and low cost

Active Publication Date: 2021-12-10
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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  • Preparation method of ZrB2-ZrC-SiC nano composite ceramic material
  • Preparation method of ZrB2-ZrC-SiC nano composite ceramic material
  • Preparation method of ZrB2-ZrC-SiC nano composite 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

The invention provides a preparation method of a ZrB2-ZrC-SiC nano composite ceramic material. The preparation method comprises the following steps: respectively preparing a zirconium source solution, a boron source solution, a silicon source solution and a carbon source solution; mixing the four solutions to obtain a target precursor solution; then drying and grinding; then carrying out ball-milling mixing; and finally, obtaining the ZrB2-ZrC-SiC nano composite ceramic material through cold press molding, isostatic pressing densification and pressureless sintering in sequence, wherein the volume ratio of ZrB2 to ZrC to SiC in the obtained material is (64-16): (64-16): 20; the ZrB2 and the ZrC are crystal grains with the average grain size of 90 to 110nm; and SiC is a mixed phase of particles, whiskers and nanowires.

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 Applications(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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