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MCrAlY+AlSiY composite coating and preparation technique thereof

A composite coating and preparation process technology, applied in the direction of metal material coating process, coating, layered products, etc., can solve the problems of increased brittleness of coating, decreased melting point, and unfavorable alternating cycle of cold and heat of coated parts, etc. Achieve the effect of improving high temperature oxidation resistance, prolonging service life and long service life

Inactive Publication Date: 2012-07-25
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, too high Al and Cr content will increase the brittleness of the coating and lower the melting point, which is not conducive to the alternating cold and hot cycle work of the coated parts

Method used

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  • MCrAlY+AlSiY composite coating and preparation technique thereof
  • MCrAlY+AlSiY composite coating and preparation technique thereof
  • MCrAlY+AlSiY composite coating and preparation technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The base material is Ni-based superalloy K465, and its nominal composition is (mass percentage): 9.75% Co, 8.75% Cr, 5.5% Al, 2.15% Ti, 1.85% Mo, 10.25% W, 1% Nb, Ni balance, Sample size is Φ15×1.5mm 2 . The MCrAlY+AlSiY composite coating was co-deposited by domestic MIP-8-800 multi-arc ion plating equipment. The composition of the MCrAlY target is as follows (by mass percentage), Co: 32; Cr: 20; Al: 8; Y: 0.5; Si: 1; B: 0.03, Ni: the balance. The sample is pretreated before deposition, that is, the substrate sample is polished to Ra=0.4 μm, wet sandblasting with 200-mesh hollow glass pellets, and then ultrasonically cleaned with metal detergent, deionized water, and acetone for 15 minutes, and washed with alcohol Rinse and tumble dry for later use. MIP-8-800 arc ion plating equipment was used to deposit conventional MCrAlY coatings, pre-evacuated to 7×10 -3 Pa, Ar gas was introduced during bombardment and deposition, and the vacuum degree was 2×10 -1 Pa. When cle...

Embodiment 2

[0028] The difference from Example 1 is:

[0029] The base material is directionally solidified Ni-based superalloy DZ125, and its nominal composition is (in terms of mass percentage): 10% Co, 9% Cr, 7% W, 5% Al, 2.5% Ti, 3.5% Ta, trace amount of C, Ni quantity. Sample size is 15×10×1.5mm 3 . Coating deposition parameters are the same as in Example 1. The MCrAlY+AlSiY composite coating was put into a quartz glass tube to be evacuated and then filled with Ar gas for protection. It was kept in a muffle furnace at 1000 °C for 5 h with a heating rate of 6 °C / min, and then cooled to room temperature with the furnace.

[0030] The cross-sectional morphology of the coating before and after diffusion annealing is as follows: image 3 shown by image 3 It can be seen that after diffusion annealing, the thickness of the surface layer of MCrAlY+AlSiY composite coating is about 15 μm, composed of β-NiAl and σ-NiCoCr, the content of Al is about 20wt%, the content of Cr is about 10wt%,...

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Abstract

The invention relates to high-temperature protective coating technology, in particular to an MCrAlY+AlSiY composite coating and a preparation technique thereof. A MCrAlY composite coating, which is rich in Al on an outer layer and rich in Cr on an inner layer and is distributed in a gradient form, is formed by depositing an AlSiY coating on a MCrAlY coating and by using a vacuum diffusion annealing method. The concentration of Al elements on the surface layer of the composite coating is 18 to 22 weight percent, and the concentration of Cr elements on the inner layer is 28 to 45 weight percent. The MCrAlY composite coating, which is rich in Al on the outer layer and rich in Cr on the inner layer and is distributed in a gradient form, is prepared by combination of arc ion plating depositionand the vacuum diffusion annealing. Compared with the existing conventional MCrAlY high-temperature protective coating, the MCrAlY+AlSiY composite coating of the invention effectively improves an A1 storage phase content and Si content in the surface layer of the coating; and the layer rich in Cr is formed on the inner layer of the coating, so the high temperature oxidation resistance and hot-corrosion resistance of the coating are improved, and the service life of the coating can be effectively prolonged. The composite coating and a preparation method thereof are suitable for protecting Ni-based high-temperature alloys.

Description

technical field [0001] The invention relates to high-temperature protective coating technology, in particular to a MCrAlY+AlSiY composite coating and a preparation method. Background technique [0002] MCrAlY (M=Ni, Co or Ni+Co) coating has achieved good results in the protection of nickel-based superalloys, and the composition and thickness can be controlled according to requirements to meet the requirements of different operating conditions, so it is used as a high-temperature protective coating Layer and thermal barrier coating bonding primer have been widely used in the high temperature protection of gas turbine blades. Related documents such as: ① Chinese invention patent, a method for preparing thermal barrier coatings by explosive spraying, application number 01133423.1; ② Chinese invention patent, an oxidation-resistant thermal barrier coating and its preparation method, application number 02133193.6; ③ China Invention patent, a preparation method of thermal shock r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B33/00B32B15/01C09D1/00C09D5/18C23C14/14C23C14/48
Inventor 孙超姜肃猛彭新鲍泽斌王启民徐朝政刘山川宫骏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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