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Ni-base superalloy complex gradient coating and preparation technique thereof

A gradient coating and coating technology, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems of increasing the weak link of the coating system and increasing the multi-layer interface, etc., and achieve long service life , prolong the service time, delay the effect of degradation

Inactive Publication Date: 2012-01-04
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

In order to improve the service life of the coating at high temperature, the reserve of Al element on the outer surface can be increased by designing a double-layer composite coating of MCrAlY and NiAl, but this method increases the multi-layer interface in the coating system, which will lead to Increased Weakness in the System

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The substrate is directionally solidified nickel-based superalloy DSM11, and its composition is as follows (mass percentage): Co: 9.5, Cr: 14, W: 3.8, Mo: 1.5, Al: 3, Ti: 4.8, Ta: 2.8, C: 0.1 , Ni: margin. The conventional MCrAlY coating is deposited on the substrate by arc ion plating (AIP). The composition of the MCrAlY target material is as follows (in mass percentage): Co: 32; Cr: 20; Al: 8; Y: 0.5; Si: 1; B: 0.03, Ni: margin. The specific operation process is as follows: the sample is pretreated before deposition, that is, the substrate sample is polished to Ra=0.4μm, and the 200-mesh hollow glass pellet is used for wet sandblasting, followed by metal detergent, deionized water, acetone ultrasonic Wash for 15 minutes, rinse with alcohol and dry for later use. The domestic MIP-8-800 multi-arc ion plating equipment is used to deposit conventional MCrAlY coatings, and the vacuum is pre-evacuated to 7×10 -3 Pa, Ar gas was introduced during bombardment and deposition,...

Embodiment 2

[0032] The base material is directionally solidified Ni-based superalloy DZ125, and its composition is as follows (mass percentage): Co: 10, Cr: 9, W: 7, Al: 5, Ti: 2.5, Ta: 3.5, C: trace, Ni: surplus quantity. The composition and deposition process of the conventional MCrAlY coating are the same as in Example 1, and the thickness of the obtained conventional MCrAlY coating is about 50 μm. NH should be mixed with Al before low pressure CVD 4 Cl drying, this embodiment adopts the method of 120 ℃ normal pressure insulation for 12h. 96wt% FeAl powder (Al content is 48wt%, powder particle size is about 250 mesh) and 4wt% dried NH 4 Cl, fully stirred and mixed evenly, put it into the CVD furnace cavity, vacuumize to 0.1 atmosphere (atm), keep it at 950°C for 5h, and obtain dry FeAl powder after cooling in the furnace. Hang the deposited or annealed MCrAlY sample into a low-pressure CVD furnace, put 800g of dry FeAl powder and 25g of dry NH 4 Cl, vacuum pumped to 0.08 atm, after...

Embodiment 3

[0035] 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 alloy target is as follows (by mass percentage), Co: 32; Cr: 20; Al: 10; 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 ...

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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 prepares an MCrAlY composite gradient coating by adopting the method combining the arc ion plating (AIP) and the diffusion aluminizing. The thickness of an aluminum-rich layer on the surface of the MCrAlY composite coating can be controlled by setting the aluminizing temperature and the period of heat preservation and the Al elements are distributed in a gradient way along the depth direction; in addition, the chemical vapor deposition method used for the aluminizing has the advantages of good uniformity on the aluminum-rich layer and being not affected by the size and shape of a sample. Since the method of direct diffusion is adopted without introducing a weak interface, the MCrAlY high-temperature protective coating can increase the content of Al memory phase to the utmost extent under the condition that the mechanical property of the coating is guaranteed, so as to improve the high-temperature oxidization resistance and the heat corrosion resistance of the coating, and can effectively prolongthe service life of the coating. The MCrAlY composite 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 MCrAlY plus compound gradient high-temperature protective coating and a preparation method thereof. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B33/00C23C28/02C23C14/22C23C14/54C23C14/02C23C10/48C23C16/20
Inventor 孙超鲍泽斌王启民李伟洲宫骏熊天英孙晓峰韦华
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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