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MB2-based ultrahigh-temperature ceramic coating and preparation method thereof

An ultra-high temperature ceramic, 60% MB2 technology, used in the field of ceramic coatings, can solve the problems of difficult to control thickness, poor coating uniformity, and low coating density.

Active Publication Date: 2020-10-30
中国人民解放军火箭军工程大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical vapor deposition (CVD) has the disadvantages of low deposition efficiency and high production cost, and the coating composition is single, so it is impossible to prepare multi-component composite ceramic coatings
The coating uniformity prepared by the embedding method is poor, and the thickness is difficult to control
The coating prepared by the slurry brushing process has low density, poor thermal shock resistance and low bonding strength

Method used

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  • MB2-based ultrahigh-temperature ceramic coating and preparation method thereof
  • MB2-based ultrahigh-temperature ceramic coating and preparation method thereof
  • MB2-based ultrahigh-temperature ceramic coating and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a MB 2 A method for preparing a base ultra-high temperature ceramic coating, comprising the following steps:

[0033] (1) Preparation of MB 2 Based ultra-high temperature ceramic agglomerated powder;

[0034] (2) Prepare the substrate for spraying;

[0035] (3) Preparation of MB on the surface of the substrate by supersonic plasma spraying 2 Base ultra-high temperature ceramic coating;

[0036] (3.1) Substrate pretreatment;

[0037] (3.2) Preparation of MB by supersonic plasma spraying 2 Base ultra-high temperature ceramic coating body.

[0038] In this scheme, optionally, in the preparation of MB by supersonic plasma spraying 2 After the body is coated with ultra-high temperature ceramics, the surface can be cleaned.

[0039] Preferably, before step (3.2), it also includes preparing a silicon-based transition layer on the surface of the substrate; the silicon-based transition layer is prepared by supersonic plasma spraying, s...

Embodiment 1

[0047] A MB of the present invention 2 (M=Zr, Hf)-based ultra-high temperature ceramic coating, the composition of which is MB 2 -M 1 Si-Mo-SiC, where MB 2 50% by volume, including HfB 2 , ZrB 2 , and by volume ratio, HfB 2 : ZrB 2 is 4:1; M 1 The volume fraction of Si is 25%, including MoSi 2 、CrSi 2 , ZrSi 2 and TaSi 2 , and by volume ratio, MoSi 2 : CrSi 2 : ZrSi 2 :TaSi 2 It is 1:1:1:1; the volume fraction of Mo is 20%; the volume fraction of SiC is 5%.

[0048] A MB of this embodiment 2 The preparation method of (M=Zr, Hf) base ultra-high temperature ceramic coating comprises the following steps:

[0049] (1) Add the raw materials according to the ratio of the coating design, with ZrO 2 As a grinding ball, resin arabic powder is used as a binder, and the amount used is 1% of the total mass of raw materials. The slurry is prepared by roller milling, the slurry is sprayed and granulated, and the agglomerates with a particle size of 20-80 μm are collected ...

Embodiment 2

[0058] The difference between this embodiment and embodiment 1 is that in the coating composition, and by volume ratio, HfB 2 : ZrB 2 It is 1:4.

[0059] MB of this embodiment 2 The ablation test results of (M=Zr, Hf) based ultra-high temperature ceramic coatings are shown in Table 1.

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Abstract

The invention provides an MB2-based ultrahigh-temperature ceramic coating which comprises an ultrahigh temperature ceramic body coating, an ultrahigh temperature ceramic body is composed of MB2-M1Si-Mo-SiC and comprises the following components in percentage by volume: 40-60% of MB2, 20-40% of M1Si, 20-40% of Mo and 0-20% of SiC, wherein the MB2 comprises HfB2 and ZrB2, the volume ratio of the HfB2 to the ZrB2 is 4: 1-1: 4, the M1Si comprises one or more of MoSi2, CrSi2, ZrSi2 and TaSi2, and the volume ratio of the MoSi2 to the CrSi2 to the ZrSi2 to the TaSi2 is (0-4): (0-4): (1-8): (0-2). Theinvention further provides a preparation method of the MB2-based ultrahigh-temperature ceramic coating. The ceramic coating is good in ablation resistance, good in spraying manufacturability, excellent in medium-high temperature oxidation resistance, compact in structure and strong in combination with a matrix. The method is simple in process, coating components and thickness are easy to control,and production efficiency is high.

Description

technical field [0001] The invention belongs to the field of ceramic coatings, in particular to a MB 2 Base ultra-high temperature ceramic coating and preparation method thereof. Background technique [0002] Hypersonic weapon systems include ballistic missiles, air-breathing hypersonic vehicles, boost-glide weapon systems, and reusable aerospace aircraft. Hypersonic weapon systems are faced with harsh aerodynamic heating phenomena and gas thermal environments, for example, the temperature can exceed 2000°C and the heat flow can exceed 10 MW / m 2 , new and higher requirements are put forward for the performance and preparation technology of thermal protection materials. Thermal protection materials are usually required to have excellent high temperature performance, ablation resistance and oxidation resistance, mechanical properties, thermophysical properties, etc. Coating the surface of materials is an effective method to improve the performance of materials. There are va...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/5133C04B41/009C04B41/5071C04B41/507C04B41/5059C04B41/4527C04B35/806C04B35/565Y02T50/60
Inventor 成程其他发明人请求不公开姓名
Owner 中国人民解放军火箭军工程大学
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