Molybdenum disilicide composite coating and preparation method thereof

A composite coating and molybdenum disilicide technology, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of low bonding strength of alloy matrix, easy low-temperature pulverization, poor thermal shock resistance, etc. problem, to achieve long service life and good thermal shock resistance

Inactive Publication Date: 2011-05-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, plasma sprayed MoSi 2 The coating still has problems such as low bonding strength

Method used

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  • Molybdenum disilicide composite coating and preparation method thereof
  • Molybdenum disilicide composite coating and preparation method thereof
  • Molybdenum disilicide composite coating and preparation method thereof

Examples

Experimental program
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Embodiment

[0026] Select MoSi with a particle size distribution of 10-30 microns and a purity of 98.0% 2 Powder and ZrO with a particle size distribution of 10-60 microns and a purity of 98.0% 2 The powder is ball milled and mixed for 12 hours according to the volume ratio of 100:20, dried and then used for later use. Use NiCr metal powder with a particle size of 20-50 microns as the transition layer powder. Using vacuum plasma spraying technology, the process parameters listed in Table 3 are selected to prepare a NiCr transition layer on the nickel-based alloy, and then MoSi is prepared on it using the process parameters listed in Table 4. 2 -20%ZrO 2 Composite coating. Pure MoSi was prepared in the same way 2 coating for comparison. The prepared coating product was tested for the following oxidation resistance and thermal shock resistance, and it was found that:

[0027] 1) After the coating was kept at 500°C for 16 hours, the surface morphology was observed ( image 3 ) shows M...

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Abstract

The invention relates to a molybdenum disilicide composite coating and a preparation method thereof. In the invention, molybdenum disilicide powder (MoSi2) with certain particle size distribution and purity and zirconia powder (ZrO2) are mixed, and a MoSi2-ZrO2 composite coating is prepared on a high temperature alloy by adopting the plasma spraying technology, wherein the prepared composite coating has fine high temperature antioxidation property and thermal shock resistance superior to that of a MoSi2 coating. The molybdenum disilicide composite coating and the preparation method also have the advantages of simple process, high efficiency, suitability for large-scale production and the like.

Description

technical field [0001] The invention relates to a molybdenum disilicide composite coating and a preparation method thereof, belonging to the coating field. Background technique [0002] Superalloys that can withstand a certain stress at high temperatures are mainly used in high-temperature components and other fields, which put forward higher requirements for the oxidation resistance and thermal stability of high-temperature materials. Currently commonly used nickel-based, iron-based, cobalt-based and other alloys have poor high-temperature oxidation resistance, which limits their applications to a certain extent. For example, the high-temperature oxidation and thermal shock caused by the gas in the gas turbine to the blades are one of the main damage forms that cause damage to the blades. The methods to solve the above problems mainly include: adopting advanced cooling technology, developing new high-temperature resistant alloy materials, improving the manufacturing proces...

Claims

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Application Information

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IPC IPC(8): C23C24/00C23C4/12C23C4/10C23C4/08C23C4/073C23C4/134
Inventor 费孝爱牛亚然季珩黄利平郑学斌
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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