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A zrc ceramic material surface zrb 2 The preparation method of -sic composite coating

A technology of composite coating and ceramic material, which is applied in the preparation of ZrB2-SiC based composite ceramic coating and the preparation of ZrB2-SiC based composite ceramic coating on the surface of ZrC ceramic composite material, can solve the high temperature protection performance of ZrC ultra-high temperature ceramics Poor problems, good chemical compatibility, good combination, and obvious application advantages

Active Publication Date: 2020-04-17
杭州尚杰装备科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of poor high temperature protection performance of ZrC ultra-high temperature ceramics, the present invention proposes a method for preparing ZrB on the surface of ZrC multiphase ceramics. 2 -SiC-based ultra-high temperature coating ideas, thus providing a ZrC ceramic material surface ZrB 2 -Preparation method of SiC composite coating

Method used

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  • A zrc ceramic material surface zrb <sub>2</sub> The preparation method of -sic composite coating
  • A zrc ceramic material surface zrb <sub>2</sub> The preparation method of -sic composite coating
  • A zrc ceramic material surface zrb <sub>2</sub> The preparation method of -sic composite coating

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specific Embodiment approach 1

[0020] Specific implementation mode one: this implementation mode comprises the following steps:

[0021] 1. Mole percentage is Zr:B 4 C: Si=1:0.456:0.368 Weigh zirconium powder, boron carbide powder and silicon powder for wet mixing by ball milling, and obtain slurry after mixing;

[0022] 2. Evaporate and dry the slurry on a rotary evaporator, and grind to obtain a mixed powder;

[0023] 3. Put the mixed powder in a vacuum hot-pressing sintering furnace, carry out hot-pressing sintering under the protection of an inert gas, and take it out after cooling with the furnace to obtain ZrB 2 - SiC-ZrC ultra-high temperature ceramic body material;

[0024] Four, the ceramic green body obtained in step 3 is crushed, ground and sieved to obtain ZrB 2 , SiC and ZrC mixed spray powder;

[0025] 5. Carry out surface pretreatment to the ZrC-SiC multiphase ceramic matrix to obtain the pretreated ZrC-SiC matrix;

[0026] Six, adopt plasma spraying technology to prepare coating, the Zr...

Embodiment 1

[0037] Select commercially available zirconium powder, boron carbide powder and silicon powder as preparation ZrB 2 , SiC and ZrC spray powder raw material powder, zirconium powder, boron carbide powder and silicon powder raw material powder by mole percentage as Zr:B 4 C: Si = 1: 0.456: 0.368 to weigh, and then put it into a ball mill jar, with absolute ethanol as dispersant, ZrO 2The ball is used as a ball milling medium, and is wet ball milled and mixed for 14 hours on a planetary ball mill at a speed of 350 r / min. The slurry mixed uniformly by ball milling was dried on a rotary evaporator under the drying conditions of a rotating speed of 75r / min and a temperature of 80°C, and then was ground to obtain a mixed powder. Put the mixed powder into a graphite mold, place it in a vacuum hot-press sintering furnace, and sinter in an argon atmosphere. Raise the temperature to 1000°C at a rate of 4°C / min and hold for 60 minutes; then raise the temperature to 1250°C at a rate of 4...

Embodiment 2

[0039] Select commercially available zirconium powder, boron carbide powder and silicon powder as preparation ZrB 2 , SiC and ZrC spray powder raw material powder, zirconium powder, boron carbide powder and silicon powder raw material powder by mole percentage as Zr:B 4 C: Si = 1: 0.456: 0.368 to weigh, and then put it into a ball mill jar, with absolute ethanol as dispersant, ZrO 2 The ball is used as a ball milling medium, and is wet ball milled and mixed for 14 hours on a planetary ball mill at a speed of 350 r / min. The slurry mixed uniformly by ball milling was dried on a rotary evaporator under the drying conditions of a rotating speed of 75r / min and a temperature of 80°C, and then was ground to obtain a mixed powder. Put the mixed powder into a graphite mold, place it in a vacuum hot-press sintering furnace, and sinter in an argon atmosphere. Raise the temperature to 1000°C at a rate of 4°C / min and hold for 60 minutes; then raise the temperature to 1250°C at a rate of ...

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Abstract

The invention relates to a preparation method of ZrB2-SiC composite ceramic coating, in particular to a preparation method of ZrC ceramic material surface ZrB2-SiC composite coating, and solves the problem that ZrC superhigh-temperature ceramic has poor high temperature protection. The preparation method comprises the specific steps of weighing raw powders in molar percentage, ball-milling, and wet-stirring to obtain a slurry; evaporatively drying the slurry, and grinding to obtain mixed powder; subjecting the mixed powder to hot-pressing sintering, cooling with a furnace, taking out to obtain ZrB2-SiC-ZrC superhigh-temperature ceramic block material; crushing the ceramic block material, grinding, and screening to obtain ZrB2-SiC-ZrC mixed spraying powder; pretreating a ZrC-SiC composite ceramic base, washing, and drying for use; spraying the ZrB2-SiC-ZrC composite coating to the pretreated ZrC-SiC base by means of plasma spraying technique. Interfacial bonding is enhanced through good chemical compatibility of ZrB2 and ZrC.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic composite coatings, and relates to a ZrB 2 -Preparation method of SiC-based composite ceramic coating, in particular to ZrB on the surface of a ZrC ceramic composite material 2 - A method for preparing a SiC-based composite ceramic coating. Background technique [0002] Zirconium carbide ceramics (ZrC) have an ultra-high melting point (3420°C) and hardness (25.5GPa), good thermal and electrical conductivity, and radiation resistance. Areas such as coatings for thermophotonic radiators will play an important role. However, the rapid oxidation and cracking behavior of ZrC ceramic materials in the environment of extreme aerodynamic heating and nuclear energy generation is an important factor restricting the application of high temperature and extreme fields. [0003] Since the oxidation of the workpiece almost always starts from the surface, the failure of the surface is an important reason f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/507C04B41/87C04B41/5059C04B41/5057C04B41/4527C04B35/565C04B35/5622
Inventor 马宝霞朱林程徐少辉
Owner 杭州尚杰装备科技有限公司
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