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Multi-component complex phase nano boride, corresponding ultra-high temperature oxidation-resistant coating and preparation method thereof

A nano-boride and anti-oxidation coating technology is applied in the field of high toughness and ultra-high temperature anti-oxidation coating and its preparation, and in the field of new multi-phase complex nano-borides, which can solve the problem of insufficient high-temperature oxidation and ablation resistance of the coating, silicon carbide Whiskers or carbon fibers break, destroy the integrity of whiskers and carbon fibers, etc., to improve the high temperature oxidation resistance, accurately control the thickness and uniformity of the coating, and improve the effect of cracking failure

Active Publication Date: 2018-08-21
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating exhibits poor toughness due to its high brittleness in high-temperature environments, and it cannot withstand large thermal stresses in long-term service and cracks and fails, resulting in insufficient high-temperature oxidation and ablation resistance of the coating. solution, which limits the engineering application of the material
[0003] At present, scholars at home and abroad often add reinforcing phases to brittle ceramic coatings to improve the fracture toughness of coatings. By introducing silicon carbide whiskers or carbon fibers with obvious aspect ratio characteristics into boride ceramics, it is hoped to obtain higher fracture toughness. Fracture toughness, but in the actual material preparation process, the integrity of the internal structure of whiskers and carbon fibers is often destroyed, resulting in fracture or degradation of silicon carbide whiskers or carbon fibers, and the toughening effect is not obvious
There are also researchers who use carbon nanotubes for strengthening and toughening, but the oxidation resistance of carbon nanotubes in high temperature environments is insufficient, and its application range is limited.

Method used

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  • Multi-component complex phase nano boride, corresponding ultra-high temperature oxidation-resistant coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Deposition of HfB on C / C composites 2 -SiC-TiB 2 coating.

[0029] The first step: preparation of nano-spray powder

[0030] 1) Preparation of slurry: high-purity HfB with an average particle diameter of 30nm 2 , SiC and TiB 2 The powder is mixed, the content of SiC in the powder is 10wt%, TiB 2 The content is 5wt%, the balance is HfB 2 . Then add binder and distilled water for preparation, and after adding balls, use a ball mill for ball milling to obtain slurry.

[0031] Described binder is polyvinyl alcohol (PVA), and the add-on of binder is 5% of mixed powder mass, and dispersant is lauryl ether and polyethylene glycol (PEG), and the add-on of dispersant is mixed powder 2% of the mass, the addition of distilled water is 40% of the mass of the mixed powder, the mass of the ball is twice that of the mixed powder, and the ball milling time is 12h;

[0032] 2) Spray drying and agglomeration granulation: transfer the slurry obtained in step 1) to a spr...

Embodiment 2

[0038] Example 2: Deposition of HfB on C / C composites 2 -SiC-TiB 2 coating.

[0039] The first step: preparation of nano-spray powder

[0040] 1) Preparation of slurry: the average particle diameter is 40nm high-purity HfB 2 , SiC and TiB 2 The powder is mixed, the SiC content in the powder is 20wt%, TiB 2 The content is 8wt%, the balance is HfB 2 . Then add binder and distilled water for preparation, and after adding balls, use a ball mill for ball milling to obtain slurry.

[0041] Described binder is polyvinyl alcohol (PVA), and the add-on of binder is 8% of mixed powder quality, and dispersant is lauryl ether and polyethylene glycol (PEG), and the add-on of dispersant is mixed powder 2% of the mass, the addition of distilled water is 60% of the mass of the mixed powder, the mass of the grinding ball is 3 times that of the mixed powder, and the ball milling time is 15h;

[0042] 2) Spray drying and agglomeration granulation: transport the slurry obtained in step 1) ...

Embodiment 3

[0048] Example 3: Deposition of HfB on C / SiC composite 2 -SiC-TiB 2 coating.

[0049] The first step: preparation of nano-spray powder

[0050] 1) Preparation of slurry: the average particle diameter is 50nm high-purity HfB 2 , SiC and TiB 2 The powder is mixed, the SiC content in the powder is 20wt%, TiB 2 The content is 10wt%, the balance is HfB 2 . Then add binder and distilled water for preparation, and after adding balls, use a ball mill for ball milling to obtain slurry.

[0051] Described binder is polyvinyl alcohol (PVA), and the add-on of binder is 6% of mixed powder quality, and dispersant is lauryl ether and polyethylene glycol (PEG), and the add-on of dispersant is mixed powder 2% of the mass, the addition of distilled water is 60% of the mass of the mixed powder, the mass of the ball is twice the mass of the mixed powder, and the ball milling time is 20h;

[0052] 2) Spray drying and agglomeration granulation: transport the slurry obtained in step 1) to a ...

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Abstract

The invention discloses a multi-component complex phase nano boride, a corresponding ultra-high temperature oxidation-resistant coating and a preparation method, and belongs to the technical field ofultra-high temperature thermal protective coatings. The multi-component complex phase nano boride and the corresponding ultra-high temperature oxidation-resistant coating are composed of 3-20wt% of TiB2, 10-40wt% of SiC and the balance HfB2. A nano structure inside the nano HfB2-SiC-TiB2 coating can control the stress at the grain boundary so as to obtain a high-strength interface, inhibit dislocation movement in a fracture process, hinder crack growth and effectively improve the fracture toughness of the coating; a third phase of TiB2 is added for modification, and TiO2 with a low melting point generated in a service process of the coating can enhance the self-healing ability of an oxide film; and the coating can resist a temperature of more than 1800 DEG C and is more stable in performance, which can effectively solve the problems of poor fracture toughness and insufficient stability of the existing ultra-high temperature oxidation-resistant coating for an aircraft in a service environment.

Description

technical field [0001] The invention belongs to the technical field of ultra-high temperature anti-oxidation coatings, and specifically relates to a novel multi-component multiphase nano-boride suitable for C / C or C / SiC composite materials, a corresponding high-toughness ultra-high temperature anti-oxidation coating and a preparation method thereof . Background technique [0002] With the development of aerospace technology, the demand for C / C or C / SiC composite materials suitable for ultra-high temperature environments is increasing rapidly. C / C or C / SiC composite materials are prone to oxidation in aerobic environments. The use of ultra-high temperature anti-oxidation protective coating on the surface can effectively improve the high temperature oxidation and ablation resistance of C / C or C / SiC composite materials. Currently, HfB 2 -SiC ultra-high temperature anti-oxidation protective coating has excellent properties such as high melting point, high hardness, good therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B35/66C04B35/622
CPCC04B35/62222C04B35/66C04B41/009C04B41/5059C04B41/507C04B41/87C04B2235/3813C04B35/83C04B35/806
Inventor 于月光章德铭贾芳冀晓鹃彭浩然侯伟骜冀国娟酉琪
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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