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Codeposition gradient Ni-base superalloy coating and preparation technique thereof

A preparation process, gradient coating technology, applied in the direction of metal material coating process, coating, layered products, etc., can solve the problems of unfavorable coating parts alternating cold and hot cycle work, increase of coating brittleness, etc., and achieve service life Long, delay coating degradation, prolong the effect of service life

Inactive Publication Date: 2008-11-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the service life of the coating can be effectively extended by increasing the content of Al source in the high-temperature protective MCrAlY coating, but too high Al content will lead to increased brittleness of the coating, which is not conducive to the alternating cold and hot cycles of the coated parts

Method used

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  • Codeposition gradient Ni-base superalloy coating and preparation technique thereof
  • Codeposition gradient Ni-base superalloy coating and preparation technique thereof
  • Codeposition gradient Ni-base superalloy coating and preparation technique thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The base material is Co-based superalloy K40, and its nominal composition is (mass percentage): 10.5% Ni, 25.5% Cr, 7.5% W, 0.45% C, Co balance, and the sample size is 15×10×1.5mm 3 . The MCrAlY+Al(SiY) 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. Clean the sample by pre-spu...

Embodiment 2

[0027] The base material is directionally solidified Ni-based superalloy DZ 125, and its nominal composition is (by mass percentage): 10% Co, 9% Cr, 7% W, 5% Al, 2.5% Ti, 3.5% Ta, trace amounts of C, Ni margin. The conventional MCrAlY coating process by arc ion plating is the same as in Example 1, and the thickness of the obtained conventional MCrAlY coating is about 60 μm. Continue to co-deposit pure Al coating on the obtained conventional MCrAlY coating, the deposition process is basically the same as that of ordinary MCrAlY coating, the pulse bias is -200V, and the thickness of the obtained pure aluminum coating is about 12 μm.

[0028] Put the MCrAlY co-deposition coating sample coated with pure Al coating into the air pressure less than 1×10 -2 In a Pa vacuum furnace, the temperature was raised to 1000°C at a heating rate of 7°C / min, held for 5 hours, and cooled to room temperature with the furnace to obtain a co-deposited gradient MCrAlY coating with a thicker outer alu...

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Abstract

The invention mainly relates to the coating technique, in particular to a gradient MCrAlY coating used for protecting high-temperature alloy and a preparation method thereof. The invention adopts a method combining the arc ion plating (AIP) co-deposition and the vacuum diffusion annealing to prepare an MCrAlY coating with the Al element concentration distributed along the depth direction in a gradient way. Compared with the existing conventional MCrAlY high-temperature protective coating, the gradient MCrAlY coating of the invention effectively increases the content of Al memory phase in the coating, so as to improve the high-temperature oxidization resistance and the heat corrosion resistance of the coating, and can effectively prolong the service life of the coating. The MCrAlY gradient coating and the preparation method of the invention can be applied to the protection of Ni-based and Co-based high-temperature alloys.

Description

technical field [0001] The invention relates to high-temperature protective coating technology, in particular to a co-deposition gradient MCrAlY coating and a preparation method. Background technique [0002] As a MCrAlY (M=Ni, Co or Ni+Co) coating with good oxidation resistance and thermal corrosion resistance, it has been widely used in the protection of heat-resistant components such as aero-engines and gas turbine blades. Used alone, it can also be used as a bonding layer (bond coat) and a surface ceramic layer (such as Y 2 o 3 Partially stabilized ZrO 2 ) together constitute a thermal barrier coating (TBCs, thermal barrier coatings) system to improve the high temperature oxidation resistance and thermal corrosion resistance of components and prolong the service life of components. 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 o...

Claims

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Application Information

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IPC IPC(8): B32B33/00B32B15/01C23C14/22C23C14/14C23C14/54C23C14/58
Inventor 孙超鲍泽斌王启民李伟洲宫骏华伟刚肖金泉刘山川熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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