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Metal ceramic coating and preparation method thereof

A cermet coating and coating technology, which is applied in the direction of metal material coating process, coating, mechanical equipment, etc., can solve the corrosion protection effect of high-temperature alloys, fail to meet the requirements of industrial applications, and have low thermal stability. problem, achieve high fracture toughness, high hardness and wear resistance, and improve the effect of thermal crack resistance

Active Publication Date: 2014-01-08
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

However, this coating decomposes at high temperatures with oxide formation and provides only short-term protection [see J. Lin, et al. A study of the oxidation behavior of CrN and CrAlN thin films in air using DSC and TGA analyzes [J]. Surface & Coatings Technology, 202 (2008): 3272-3283.]
[0004] At present, the nitride protective coatings of superalloys cannot effectively protect superalloys from corrosion due to their poor toughness, low bonding strength with the substrate, lack of compact structure, or low thermal stability. Far from meeting the requirements of industrial applications

Method used

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  • Metal ceramic coating and preparation method thereof
  • Metal ceramic coating and preparation method thereof

Examples

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Embodiment 1

[0042] The martensitic heat-resistant steel 1Cr16Ni2MoN is used as the substrate, and the multi-arc ion plating technology is used as the preparation method of the ceramic coating. The preparation process is as follows:

[0043] (1) Preparation of alloy target (taking NiCrAlSiY alloy target as an example): Ni-Cr-Al-Si-Y multi-component alloy prepared by vacuum melting method is used as cathode target material, and its alloy composition is: 8~13wt .% Al, 20-26 wt.% Cr, 0.5-1.0 wt.% Si, about 0.5 wt.% Y, the balance being Ni, and the total content of Al and Cr is 31-37 wt.%;

[0044] (2) Pre-treatment of parts: Before coating, the parts are subjected to conventional grinding and mirror polishing, and finally ultrasonically cleaned with acetone and alcohol respectively, and dried for later use;

[0045] (3) Coating preparation: the sample is placed on the sample holder of the vacuum coating chamber, and high-purity Ar (purity 99.99%) and N 2 (purity 99.99%), using the triggering...

Embodiment 2

[0050] The nickel-based superalloy K417 is used as the substrate, and the multi-arc ion plating technology is used as the preparation method of the ceramic coating. The preparation process is as follows:

[0051] (1) The preparation of the alloy target is the same as in Example 1;

[0052] (2) Part pretreatment is the same as embodiment 1;

[0053] (3) Coating preparation: The substrate negative bias voltage is 300V during coating deposition, and other process parameters are the same as in Example 1.

[0054] The coating deposition rate is 148.9nm / min, the coating is γ-Ni, CrN and AlN phase, and its microstructure is as follows figure 2 shown. The nitrogen content of the coating is 15.40 at.%, and the Al and Cr contents are 14.88 at.% and 16.87 at.%, respectively. The hardness of the coating is 970.2 HV 25gf , the wear amount of the coating is 6.96×10 when the load is 10N -3 mm 3 / m. Sample after 1000 o C Oxidation at constant temperature for 100 hours, a thin continu...

Embodiment 3

[0056] The ceramic coating is prepared by using the nickel-based superalloy K438 as the substrate and adopting multi-arc ion plating technology, and the preparation process is the same as that in Example 2.

[0057] The deposition rate of the coating is 145.4 nm / min, and the coating is γ-Ni, CrN and AlN phases. The nitrogen content of the coating is 16.35 at.%, and the Al and Cr contents are 14.18 at.% and 16.14 at.%, respectively. The hardness of the coating is 980.6 HV 25gf , the wear amount of the coating is 6.04×10 when the load is 10N -3 mm 3 / m. Sample after 1000 o C Oxidation at constant temperature for 100 hours, a thin continuous and dense aluminum oxide film is formed on the surface of the coating, and the oxidation weight gain per unit area of ​​the sample is 0.37mg / cm 2 .

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Abstract

The invention discloses a metal ceramic coating, composed of a metal phase matrix and dispersed nanometer crystal nitride phase particles, wherein a metal phase (b) is an alloy phase or pure metal containing solid solution strengthened alloy component; the nitride phases (c) are dispersed in the metal phase (b); the volume percentage of the nitride (c) is 5-60%. A preparation method of the metal ceramic coating specifically adopts a vacuum physical vapor deposition method, comprising three steps: (1), putting parts to a vacuum chamber (3); (2), introducing reaction air (f) into the vacuum chamber (e); (3), enabling substances on the surface of a target (g) to form a gaseous phase (h). The coating of the invention has high fracture toughness, oxidization resistance and corrosion resistance, high viscosity of an oxidation film, and good hardness and wearing resistance. The preparation process of the coating is simple; after being prepared, the coating does not need subsequent treatment such as vacuum annealing and the like, thereby having high production efficiency.

Description

technical field [0001] The invention relates to high temperature protection technology, and in particular provides a cermet coating and a preparation method thereof. Background technique [0002] MCrAlY coating is an ideal cladding coating. Because of its good high temperature oxidation resistance and thermal corrosion resistance, as well as good toughness and thermal fatigue resistance, it is widely used in turbine blades of aero-engines, gas turbines, etc. The advantage of MCrAlY coating lies in the diversity of its composition selection, that is, the appropriate coating composition can be selected according to different working environments and different substrate materials, and is not limited by the chemical composition and microstructure of the substrate. But the hardness and wear resistance of MCrAlY coating need to be improved. At present, the main preparation methods of MCrAlY coatings are physical vapor deposition and plasma spraying. [0003] Compared with MCrAl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06F01D5/28
Inventor 朱圣龙王福会朱丽娟王文辛丽
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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