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High-entropy ceramic modified coating with controllable components and controllable microstructure, and preparation method thereof

A technology for modifying coatings and microstructures, which is used in infiltration-assisted in-situ reaction preparation of components, microstructure controllable high-entropy ceramic modified coatings and preparation, and composition and microstructure controllable high-entropy ceramic modified coatings It can solve the problems of insufficient oxidation resistance, ablation resistance and erosion resistance, low content of ultra-high temperature ceramic phase, insufficient development system, etc., to achieve improved hardness and high temperature oxidation corrosion resistance, strong cohesive bonding force, and simple preparation process. Effect

Pending Publication Date: 2021-08-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating has the defects of high residual silicon content, low ultra-high temperature ceramic phase content and single component, and insufficient oxidation resistance, ablation resistance, and erosion resistance in ultra-high temperature environments (1973K and above).
In addition, the current development of high-entropy ceramic modified coatings (Yang Yong, Sun Wenwei, Sun Xiaowen, etc. The preparation method of high-entropy ceramic coatings, CN111254379A[P].2020) is not systematic enough, and the existing technology (spraying method) is not complete.

Method used

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  • High-entropy ceramic modified coating with controllable components and controllable microstructure, and preparation method thereof
  • High-entropy ceramic modified coating with controllable components and controllable microstructure, and preparation method thereof
  • High-entropy ceramic modified coating with controllable components and controllable microstructure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Vapor-phase siliconizing (Si) assisted multi-principal element (Hf, Zr, Ti, Cr) B 2 Preparation of SiC-Si coating modified by solid solution of ultra-high temperature and high entropy ceramics:

[0076] Step 1: Select 2.5D carbon / carbon (C / C) composite material as the substrate and pre-treat it:

[0077] Cut the selected substrate into the shape required for testing and characterization, sand it with sandpaper, remove the corners, ultrasonically clean it in industrial alcohol for 60 minutes, and then dry it in an oven at 393K for 3 hours;

[0078] Step 2: Preparation of PR-TM x o y -B 4 C-SiC-C slurry suspension (referred to as A):

[0079] Anhydrous ethanol was selected as the solvent, and thermosetting phenolic resin (PR) with a carbon production rate of 53wt.% was used as the binder precursor and as the carbon source. First put PR and absolute ethanol in a beaker with a mass ratio of 5:100 for ultrasonic dispersion for 30 minutes to obtain a uniform PR-absolute ...

Embodiment 2

[0093] Zirconium silicide (ZrSi 2 ) Auxiliary (Hf, Zr, Ti, Cr, Ta) B 2 -ZrC-SiC / ZrC-SiC coating preparation:

[0094] Step 1: Choose a density of 1800kg / m 3 The high-strength graphite is used as the base material, and it is pretreated:

[0095] Cut the selected substrate into the shape required for testing and characterization, sand it with sandpaper, remove the corners, ultrasonically clean it in industrial alcohol for 50 minutes, and then dry it in an oven at 383K for 5 hours;

[0096] Step 2: Prepare PCS-C slurry suspension (denoted as B) and PR-TM x o y -B 4 C-SiC-C slurry suspension (referred to as C):

[0097] Xylene is selected as a solvent, and polycarbosilane (PCS), a SiC ceramic precursor with a ceramization yield of 63wt.%, is used as a binder and also as a source of SiC ceramics. Polycarbosilane (PCS), graphite (C) powder, and xylene were placed in a beaker at a mass ratio of 3:1:20, heated to 333K, and ultrasonically dispersed for 60 minutes to obtain a uni...

Embodiment 3

[0112] Embedding solidification titanium (Ti) powder assisted ((Hf, Zr, Ti, Cr, Ta) B 2 -SiC-TiC-Ti) 4 Multi-layer gradient coating preparation:

[0113] Step 1: Select 2.5D carbon / carbon (C / C) composite material as the substrate and pre-treat it:

[0114] Cut the selected substrate into the shape required for testing and characterization, sand it with sandpaper, remove the corners, ultrasonically clean it in industrial alcohol for 30 minutes, and then dry it in an oven at 383K for 3 hours;

[0115] Step 2: Preparation of PR-TM with four different ultra-high temperature ceramic precursor powder contents x o y -B 4 C-SiC-C slurry suspension (denoted as D, E, F and G in sequence):

[0116]Acetone was selected as the solvent, and thermosetting phenolic resin (PR) with a carbon yield of 53wt.% was used as the binder precursor and as the carbon source. First put PR and acetone in a beaker with a mass ratio of 3:50 for ultrasonic dispersion for 30 minutes to obtain a uniform P...

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Abstract

The invention relates to a high-entropy ceramic modified coating with controllable components and a controllable microstructure, and a preparation method thereof. The high-entropy ceramic modified coating is a mixed coating formed by any four or more elements selected from zirconium (Zr), titanium (Ti), hafnium (Hf), tantalum (Ta), niobium (Nb), vanadium (V), chromium (Cr), molybdenum (Mo) or tungsten (W) and a substrate coating. The substrate coating comprises SiC-Si, ZrC-ZrSi2 or TiC-Ti. The preparation method comprises the following steps: pre-treating a base material; and mixing a solvent and a binder, carrying out ultrasonic dispersion, then adding a corresponding high-entropy ceramic precursor raw material TMxOy and other raw materials to prepare a uniform slurry suspension solution, and carrying out dipping-drying curing to obtain a pre-coating layer. According to the method, the high-entropy ceramic does not need to be prepared in advance, only the corresponding precursor raw materials are used for coating the surface of the base material through a simple material coating method, and a (carbon, nitrogen, carbon nitrogen or boron) compound high-entropy ceramic solid solution is generated in situ in a infiltration process, so solid solution strengthening effect can be achieved, the cohesion binding force of the coating is high, the hardness and high-temperature oxidation corrosion resistance of the coating can be further improved, and large-scale industrial application can be achieved.

Description

technical field [0001] The invention belongs to the technical field of material modification by high-entropy ceramics, and relates to a high-entropy ceramic modified coating with controllable composition and microstructure and a preparation method thereof, in particular to an infiltration-assisted in-situ reaction preparation composition, microstructure controllable Controlled high-entropy ceramic modified coating and preparation method. Background technique [0002] Carbon-based composites are a kind of high-temperature thermal structural materials with excellent comprehensive properties, which have the characteristics of high specific strength, low thermal expansion coefficient and excellent high-temperature mechanical properties. However, the insufficient antioxidant performance seriously restricts its in-depth application in extreme environments. Surface coating technology can effectively improve its high temperature oxidation resistance and ablation resistance. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C04B41/88
CPCC04B41/87C04B41/009C04B41/5096C04B41/88C04B41/5059C04B35/83C04B35/522C04B41/5062C04B41/4558C04B41/4552C04B41/5057C04B41/5133
Inventor 付前刚张佩李贺军刘冰程春玉孙佳谢薇张佳平
Owner NORTHWESTERN POLYTECHNICAL UNIV
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