High temperature alloy protective technology

Abstract

The high temperature alloy protecting technology includes the first forming binding layer in the same components as the substrate on the surface of the high temperature alloy substrate and the subsequent baking composite oxide coating on the surface. The composite oxide coating consists of basic enamel material and added Al2O3 or MgO in 10-40 wt% and Y2O3 in 1-5 wt%; and the basic enamel material consists of ZrO2 3-6 wt%, Al2O3 3-6 wt%, ZnO 8-12 wt%, CaO 3-6 wt%, B2O3 3-6 wt%, Na2O 3-6 wt%, K2O 5-8 wt%, TiO2 1-4 wt% and SiO2 for the rest. The present invention raises the high temperature oxidation resistance and heat corrosion resistance of the substrate and raise the stripping-off resistance of the coating and avoids the mutual diffusion between elements.

Description

Technical field:

[0001] The invention relates to material science, and in particular provides a method for improving the high-temperature protection performance of a high-temperature alloy by using a composite oxide coating and a metal bonding layer. Background technique:

[0002] Due to the harsh service environment, protective coatings must be applied to aeroengine turbine blades to improve the high temperature oxidation and hot corrosion resistance of the base alloy. Traditional high-temperature protective coatings include diffusion coatings (such as aluminized coatings) and alloy cladding coatings (such as MCrAlY coatings). The basic design idea of ​​these coatings is to form a stable protective oxide film on the surface of the coating to provide protection to the base alloy during service.

[0003] If an oxide layer is directly prepared on the surface of the alloy, it can also isolate the corrosion medium and reduce the corrosion rate of the alloy. Compared with tradi...

Images