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A high-temperature coating comprising an active diffusion barrier layer of zirconia and its preparation method

A zirconia, high-temperature technology, applied in chemical instruments and methods, layered products, metal layered products, etc., can solve the problems of anti-oxidation coatings that have not been reported yet, and achieve excellent thermal stability, high thermal stability, The effect of avoiding the deterioration of the mechanical properties of the matrix

Active Publication Date: 2016-01-13
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

[0004] So far, no anti-oxidation coatings using zirconia as an active diffusion barrier have been reported

Method used

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  • A high-temperature coating comprising an active diffusion barrier layer of zirconia and its preparation method
  • A high-temperature coating comprising an active diffusion barrier layer of zirconia and its preparation method
  • A high-temperature coating comprising an active diffusion barrier layer of zirconia and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The substrate is DZ40M alloy, the substrate sample is 15mm×10mm×2.5mm, and the purity of the zirconia target is 99.95wt%. The matrix sample is loaded into the working room after surface cleaning; the working room is vacuumed to 3×10 -2 ~7×10 -2 Pa, heat the substrate with a heating gun, and start evaporating the target after the temperature of the substrate sample reaches 700-800°C. 3 μm. In this embodiment, the chemical composition and content of the zirconia inner layer are as follows: the zirconia content is 99.95wt%, and the rest is hafnium oxide.

[0034] Observing the cross-section of the deposited zirconia film, it can be seen that the structure of the film layer is dense and well combined with the alloy matrix, such as figure 1 Shown in a; X-ray diffraction analysis shows that its crystal form is a tetragonal structure, and the results are as follows figure 1 as shown in b.

Embodiment 2

[0036] The substrate is DD6 superalloy, the substrate sample is 15mm×10mm×2.5mm, and the target is 6-10wt% yttria-stabilized zirconia. After the substrate sample is cleaned on the surface, it is loaded into the working room, and the working room is vacuumed to 7×10 -2 ~1.2×10 -1 Pa, heat the substrate with a heat gun, and start evaporating the target after the temperature of the substrate sample reaches 800-850°C. 4 μm. In this embodiment, the chemical composition and content of the zirconia inner layer are: 90wt% zirconia, and the rest is yttrium oxide. Using multi-arc ion plating technology to deposit a layer of NiCrAlY (Ni-25Cr-11Al-0.5Y, wt%) coating with a thickness of 20-30 μm on zirconia, the preparation parameters are Ar gas pressure 0.1-0.2Pa, substrate temperature 200 ~250℃, arc current 65~75A, DC bias voltage -10~-20V, duty cycle 20%, deposition for about 400min. Subsequently, the substrate / coating system was oxidized at 970° C. for 5 hours.

[0037] The cross-...

Embodiment 3

[0039] The substrate is made of ReneN5 superalloy, the substrate sample is 15mm×10mm×2.5mm, and the target material is zirconia stabilized with 6-10wt% hafnium oxide. The matrix sample is loaded into the working room after surface cleaning; the working room is vacuumed to 8×10 -2 ~2×10 -1 Pa, heat the substrate with a heat gun, and start evaporating the target after the temperature of the substrate sample reaches 850-900°C, the voltage of the evaporation gun is 17-24kV, the evaporation current is 1.6-2A, the deposition time is about 1min, and the thickness of the zirconia film is about 3μm ; In this embodiment, the chemical composition and content of the inner layer of zirconia are: 90wt% zirconia, and the rest is hafnium oxide. A layer of NiCoCrAlY (Ni-20Co-25Cr-11Al-0.5Y, wt%) coating with a thickness of 20-30 μm was deposited on zirconia by multi-arc ion plating technology. Subsequently, the substrate / coating system was oxidized at 1000°C for 100 hours.

[0040] The cros...

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Abstract

The invention relates to the high temperature coating technology, and in particular relates to a high temperature coating containing zirconium oxide active diffusing barrier and a preparation method thereof. The high temperature protective coating comprises a zirconium oxide active diffusing inner layer and an anti-high temperature oxidizing protective layer. The zirconium oxide inner layer can be spontaneously converted into a multilayer film structure comprising aluminum oxide / metal / aluminum oxide in the using process, so that mutual diffusion between the anti-high temperature oxidizing protective layer and a base body can be resisted, and the coating has good binding strength and thermal stability, so that effective antioxidant components in the anti-high temperature oxidizing protective layer are prevented from diffusing to the base body, and therefore, the service life of the high temperature coating is prolonged, and the mechanical performance of the base body is not damaged. The preparation method comprises the following steps of: first, preparing a zirconium oxide layer on the surface of the base body by an electron beam physical vapor deposition method; and then, preparing the anti-high temperature oxidizing protective layer on the active diffusing barrier by one of a vacuum physical vapor deposition method, a chemical vapor deposition method, a thermal spraying method and the like or combination thereof.

Description

technical field [0001] The invention relates to a high-temperature coating technology, in particular to a high-temperature coating containing a zirconia active diffusion barrier coating for alloy high-temperature protection and a preparation method thereof. Background technique [0002] With the continuous improvement of engine efficiency, in order to ensure that the engine blades made of superalloys have both good high-temperature mechanical properties and excellent high-temperature corrosion resistance, applying MCrAlY high-temperature protective coatings on the surface of the blades is an effective way. However, the increase of the service temperature of the engine intensifies the interdiffusion of alloy components between the alloy matrix and the protective coating, and accelerates the degradation of the matrix / coating system. The main manifestations are: (1) the beneficial components Al and Cr are protected by MCrAlY The coating diffuses to the substrate, and W, Ta, Mo ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B15/04
Inventor 王福会王文程玉贤朱圣龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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