Nanometer crystalline compound coating and its prepn process

A nanocrystalline composite and nanocrystalline technology, applied in the field of material science, can solve the problems of short coating life and high preparation cost, achieve good high temperature and thermal corrosion resistance, avoid interdiffusion, and ensure quality and service life.

Inactive Publication Date: 2006-10-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanocrystalline coating in the prior art is directly coated on the surface of the base material, the preparation cost is high, and the coating life is short during use.

Method used

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  • Nanometer crystalline compound coating and its prepn process
  • Nanometer crystalline compound coating and its prepn process
  • Nanometer crystalline compound coating and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Sample cast state M17, size is 20mm * 10mm * 3mm, use HVOF (hypersonic flame spraying) method to make a layer of CoNiCrAlY (21wt%Ni, 38wt%Cr, 8wt%Al, 0.5wt%Y, Co 1) The thickness is 20 μm; then, a 10 μm thick nanocrystalline CoNiCrAlY layer with the same composition is prepared on the surface of the CoNiCrAlY layer by sputtering, the coating surface is flat and the structure is dense. High temperature and NaCl corrosion resistance are shown in Table 2 and Table 3.

Embodiment 2

[0035] Sample cast state M17, size is 20mm * 10mm * 3mm, use HVOF (hypersonic flame spraying) method to make a layer of CoNiCrAlY (21wt%Ni, 38wt%Cr, 8wt%Al, 0.5wt%Y, Co I) thickness is 20 μm; then, a 10 μm thick nanocrystalline CoNiCrAlY layer with the same composition is prepared on the surface of the CoNiCrAlY layer by arc plating, the coating surface is smooth and the structure is dense. High temperature and NaCl corrosion resistance are shown in Table 2 and Table 3.

Embodiment 3

[0037] Sample cast state M17, size is 20mm * 10mm * 3mm, use HVOF (hypersonic flame spraying) method to make a layer of CoNiCrAlY (21wt%Ni, 38wt%Cr, 8wt%Al, 0.5wt%Y, Co I) the thickness is 20 μm; then, a 10 μm thick nanocrystalline CoNiCrAlY layer with the same composition is prepared on the surface of the CoNiCrAlY layer by EB-PVD (Electron Beam Physical Vapor Deposition), the coating surface is smooth and the structure is dense. High temperature and NaCl corrosion resistance are shown in Table 2 and Table 3.

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Abstract

The nanometer crystalline compound coating includes one inner MCrAlY layer, with M being mixture of Ni and/or Co, and one outer nanometer crystalline layer of Al, Cr, Y and other material in certain weight proportion. The preparation process of the nanometer crystalline compound coating includes the first preparation of the MCrAlY layer on the surface of the substrate, and the subsequent preparation of the nanometer crystalline layer on the surface of the MCrAlY layer. The present invention has low preparation cost and simple preparation process, and the nanometer crystalline compound coating has excellent heat resisting and anticorrosive performance and long service life.

Description

Technical field: [0001] The invention relates to material science, and particularly provides a nanocrystalline composite coating and a preparation method thereof. Background technique: [0002] In the prior art, the development of gas turbine related technologies is greatly limited by material technology and design. In the process of technological development, the development of structural design technology, blade cooling technology, and high-temperature casting alloy technology has effectively improved the efficiency and power of gas turbines. Since the 1960s, MCrAlY coatings have been widely used in gas turbine blade technology with high operating parameters and harsh environments due to their excellent oxidation resistance. However, it has been found in actual use that the performance of this coating depends to a large extent on the use of different preparation methods. The reason is that when different preparation methods are used, even if the chemical composition of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/04
Inventor 朱圣龙谢冬柏王福会王世臣
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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