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A multi-component Zr/hf based ultra-high melting point carbide anti-oxidation coating and its preparation method

An anti-oxidation coating, carbide technology, applied in the coating, metal material coating process, melt spraying and other directions, to solve the problem of thermal mismatch, the deposition speed is fast, and the coating composition is controllable.

Active Publication Date: 2021-04-13
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, to provide a multi-component Zr / Hf based ultra-high melting point carbide anti-oxidation coating and its preparation method, the multi-layer structure ultra-high melting point carbide coating prepared by the preparation method , the coating has good compactness, uniform and controllable structure, good process repeatability, and fast deposition speed, especially suitable for the preparation of large-area structural parts coatings, and solves the problem between the ultra-high melting point carbide coating and the C / C composite material substrate. thermal mismatch conundrum

Method used

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  • A multi-component Zr/hf based ultra-high melting point carbide anti-oxidation coating and its preparation method
  • A multi-component Zr/hf based ultra-high melting point carbide anti-oxidation coating and its preparation method
  • A multi-component Zr/hf based ultra-high melting point carbide anti-oxidation coating and its preparation method

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preparation example Construction

[0039] The preparation method of the multi-component Zr / Hf based ultra-high melting point carbide anti-oxidation coating of the present invention specifically comprises the following steps:

[0040] Step 1: Preparation of SiC transition layer

[0041] The C / C composite material matrix is ​​polished with 400-600 mesh sandpaper and ultrasonically cleaned, then placed on the sample holder, and Si powder with a particle size of 5-15 μm is put into the powder delivery tank, and the C / C composite is made of plasma flame flow. The material is preheated to 800°C-950°C, and the Si coating is prepared by plasma spraying physical vapor deposition method. The thickness of the coating is 10-50 μm. 15min to 30min, to ensure that the Si coating fully reacts with the C / C composite material to form a SiC transition layer.

[0042] Plasma spraying physical vapor deposition spraying process parameters: vacuum chamber pressure is 150-350Pa, spraying current is 1600-1800A, spraying voltage is 40-...

Embodiment 1

[0052] The preparation method of anti-ablation composite coating comprises the following steps:

[0053] Step 1: Preparation of SiC transition layer

[0054] After the C / C composite material was polished with 400-600 mesh sandpaper and ultrasonically cleaned, it was placed on the sample holder, and Si powder with a particle size of 5-15 μm was put into the powder delivery tank, and the C / C composite material was sprayed by plasma flame flow. Preheat to 800°C, use plasma spraying physical vapor deposition technology to prepare Si coating, the thickness of the coating is 10μm, continue to use plasma flame to heat after the preparation is completed, the heating temperature is 1800°C, and the heating time is 15min to ensure that the Si coating is consistent with the C / The C composite material fully reacts to form a SiC transition layer, and the plasma spraying physical vapor deposition spraying process parameters: the vacuum chamber pressure is 150Pa, the spraying current is 1600...

Embodiment 2

[0065]The preparation method of anti-ablation composite coating specifically comprises the following steps:

[0066] Step 1: Preparation of SiC transition layer

[0067] After the C / C composite material was polished with 400-600 mesh sandpaper and ultrasonically cleaned, it was placed on the sample holder, and Si powder with a particle size of 5-15 μm was put into the powder delivery tank, and the C / C composite material was sprayed by plasma flame flow. Preheat to 950°C, use plasma spraying physical vapor deposition technology to prepare Si coating, coating thickness is 50μm, continue to use plasma flame to heat after preparation, heating temperature is 2000°C, heating time is 30min, to ensure Si coating and C / The C composite material fully reacts to form a SiC transition layer, and the plasma spraying physical vapor deposition spraying process parameters: the vacuum chamber pressure is 350Pa, the spraying current is 1800A, the spraying voltage is 45V, the flow rate of main g...

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Abstract

The invention relates to a multi-component Zr / Hf-based ultra-high melting point carbide anti-oxidation coating and a preparation method thereof. The anti-oxidation coating consists of a SiC transition layer, a Zr / Hf-based oxygen barrier layer and a Zr / Hf coating from the inside to the outside. Based anti-ablation layer, in which Zr / Hf based oxygen barrier layer is ZrB 2 , HfB 2 and SiC; Zr / Hf based anti-ablative layers are ZrC, HfC, SiC and MoSi 2 The anti-oxidation coating fundamentally solves the problem of thermal mismatch between the ultra-high melting point carbide coating and the C / C composite material matrix, and the coating has better compactness; the preparation method of the present invention effectively avoids the carbide The problem of high stress and easy cracking during the coating deposition process, the deposition speed is fast during the preparation process, the coating composition and structure are uniform and controllable, the process repeatability is good, the deposition speed is fast, the efficiency is high, and the cost is low, especially suitable for large areas and complex coatings. Rapid preparation of coatings for special-shaped structural parts.

Description

technical field [0001] The invention belongs to the technical field of surface thermal protection, and in particular relates to a multi-component Zr / Hf-based ultra-high melting point carbide anti-oxidation coating and a preparation method thereof. Background technique [0002] As a light-weight and high-temperature-resistant structural material, C / C composite material has the characteristics of low density, high specific strength, and excellent ablation resistance in an inert environment. However, C / C composites are easily oxidized in an aerobic environment over 400 °C, resulting in a rapid decline in their mechanical properties and physical and chemical properties. Coating technology is an important means to improve the oxidation resistance of C / C composites. [0003] Compared with the boride coating, the carbide coating has a higher melting point (ZrC-3420°C, HfC-3930°C, TaC-3890°C), and a lower thermal expansion coefficient (~7×10 -6 / K), better thermal stability, high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/10C23C4/04C23C4/18
Inventor 倪立勇杨震晓曾一兵马康智文波曲栋
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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