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MoSi2-SiO2-borosilicate coating with high temperature resistance and high emissivity resistance, and preparation method and application thereof

A mosi2-sio2-, 1.mosi2-sio2- technology is applied in the field of MoSi2-SiO2-borosilicate high temperature resistant and high emissivity coating and its preparation, which can solve the problem that the quality and purity of powder are difficult to guarantee and difficult to apply In the ultra-high temperature field, there is no problem of high temperature oxidation resistance, so as to achieve the effect of lowering temperature, superior high temperature resistance and easy operation.

Active Publication Date: 2018-10-16
LAIWU ADVANCED CERAMIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some metals and transition metal oxides, due to the existence of more electron shells, are more likely to produce short-wave infrared radiation according to the electronic transition mechanism, and the spinel structure (AB 2 o 4 ) is conducive to the improvement of emissivity, but its high emissivity band is mainly around 10 μm, which is difficult to apply to the field of ultra-high temperature, and there is no ability to resist high-temperature oxidation at high temperature
MoSi 2 With high melting point, high infrared emissivity and good high-temperature oxidation resistance, it is a high-emissivity coating filler that has been studied abroad, but the domestic synthesis technology is not yet mature, and it is difficult to guarantee the quality and purity of the powder, and the powder expensive

Method used

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  • MoSi2-SiO2-borosilicate coating with high temperature resistance and high emissivity resistance, and preparation method and application thereof
  • MoSi2-SiO2-borosilicate coating with high temperature resistance and high emissivity resistance, and preparation method and application thereof
  • MoSi2-SiO2-borosilicate coating with high temperature resistance and high emissivity resistance, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] MoSi 2 -SiO 2 -A method for preparing a borosilicate high-temperature-resistant high-emissivity coating, comprising the following steps:

[0042] (1) MoSi 2 -SiO 2 Preparation of composite powder: weigh MoO with a mass percentage of 63% 2 Powder, 37% Si powder, add ethanol as a solvent, grind in a planetary mill for 12 hours, then dry in an oven at 80°C for use; then take an appropriate amount of mixed powder in a graphite crucible, protect it with Ar gas, and sinter Heating in the furnace to 1300°C and holding it for 30 minutes to obtain MoSi2-SiO2 composite powder; the prepared MoSi 2 -SiO 2 Composite powders were initially pulverized with a mortar, and then ground in a planetary mill for 12 hours, and the MoSi 2 -SiO 2 The composite powder is ground to D 50 =5 μm, dried in an oven at 80°C for use.

[0043] (2) Weigh MoSi with a mass ratio of 20% 2 -SiO 2 Composite powder, 78% borosilicate glass powder, 2% SiB 6 Put the powder in a ball mill jar, add ethan...

Embodiment 2

[0046] MoSi 2 -SiO 2 -A method for preparing a borosilicate high-temperature-resistant high-emissivity coating, comprising the following steps:

[0047] (1) MoSi 2 -SiO 2 Preparation of composite powder: weigh MoO with a mass percentage of 62% 2 Powder, 38% Si powder, add ethanol as a solvent, grind in a planetary mill for 12 hours, then dry in an oven at 80°C for use; then take an appropriate amount of mixed powder in a graphite crucible, protect it with Ar gas, and sinter Heating in the furnace to 1350°C and holding it for 30 minutes to obtain MoSi 2 -SiO 2 Composite powder; prepared MoSi 2 -SiO 2 Composite powders were initially pulverized with a mortar, and then ground in a planetary mill for 12 hours, and the MoSi 2 -SiO 2 The composite powder is ground to D 50 =5 μm, dried in an oven at 80°C for use.

[0048] (2) Weigh MoSi with a mass ratio of 40% 2 -SiO 2 Composite powder, 56% borosilicate glass powder, 4% SiB 6 Put the powder in a ball mill jar, add etha...

Embodiment 3

[0051] MoSi 2 -SiO 2 -A method for preparing a borosilicate high-temperature-resistant high-emissivity coating, comprising the following steps:

[0052] (1) MoSi 2 -SiO 2 Preparation of composite powder: weigh MoO with a mass percentage of 61% 2 Powder, 39% Si powder, add ethanol as a solvent, grind in a planetary mill for 12 hours, then dry in an oven at 80°C for use; then take an appropriate amount of mixed powder in a graphite crucible, protect it with Ar gas, and sinter Heating in the furnace to 1350°C and holding it for 40 minutes to obtain MoSi 2 -SiO 2 Composite powder; prepared MoSi 2 -SiO 2 Composite powders were initially pulverized with a mortar, and then ground in a planetary mill for 12 hours, and the MoSi 2 -SiO 2 The composite powder is ground to D 50 =5 μm, dried in an oven at 80°C for use.

[0053] figure 1 is made of MoSi 2 -SiO 2 The XRD diffraction pattern of the composite powder shows that the composite powder is MoSi 2 , SiO 2 two phases. ...

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Abstract

The invention relates to a MoSi2-SiO2-borosilicate coating with high temperature resistance and high emissivity resistance, and a preparation method and application thereof. The raw material composition of the coating is prepared from the following ingredients in parts by weight: 20-70wt% of MoSi2-SiO2 compound powder, 25-80wt% of borosilicate glass powder and 0-6wt% of SiB. Firstly, MoO2 and Si are taken as raw materials to prepare the MoSi2-SiO2 compound powder at a certain ratio, the MoSi2-SiO2 compound powder serves as a high emissivity phase, the borosilicate glass powder is taken as high-temperature binder, SiB6 is taken as additive, polyvinylpyrrolidone (PVP) is taken as a dispersant, ethyl alcohol is taken as solvent, and evenly disperse slurry is prepared; a spray method is adopted to prepare the coating with high temperature resistance and high emissivity resistance on an aluminum oxide ceramic substrate. The thickness of the MoSi2-SiO2-borosilicate coating is 50-200 mu m, the room temperature emissivity of a near-infrared waveband (0.75-2.5 mu m) is greater than 0.88, the room temperature emissivity of a waveband of 2.5-5 mu m is greater than 0.85, and meanwhile, the MoSi2-SiO2-borosilicate coating has excellent temperature resistance, emissivity resistance and thermal shock resistance.

Description

technical field [0001] The invention belongs to the field of thermal protective coating preparation, and relates to MoSi 2 -SiO 2 - Borosilicate high temperature resistant high emissivity coating and its preparation method and application. Background technique [0002] With the rapid development of today's aerospace technology, the research and development of hypersonic vehicles has attracted more and more attention from all over the world. Hypersonic generally refers to more than 5Ma. This type of aircraft mainly includes ballistic missiles, cruise missiles, re-entry vehicles, and trans-atmospheric vehicles. The main features are high maneuverability and long-distance precision strikes. It can be seen that hypersonic vehicles have become the main development direction of aerospace and will play an important role in future national security. However, with the improvement of aircraft performance, especially the increase of speed, the requirements for its protective materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/507C04B41/87C04B35/10C04B41/4543C04B41/5022C04B41/5025C04B41/5035
Inventor 张振昊高德志龚红宇孙海滨张玉军
Owner LAIWU ADVANCED CERAMIC TECH
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