High-temperature protective coating of MCrAlY alloy system and preparation method
A protective coating and system technology, which is applied in the field of high-temperature protective coating and preparation of McrAlY alloy system, can solve the problems of high-temperature protective coating degradation, reduced coating protective performance, and decreased coating AI content, and achieves good heat resistance. Vibration performance, controllable coating thickness, good resistance to salt spray corrosion
Active Publication Date: 2013-04-17
中建投(沈阳)科创产业发展有限公司
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AI Technical Summary
Problems solved by technology
However, due to the growth of the oxide film and the interdiffusion between the urethane layer and the substrate during use, the AI content in the coating decreases, which will also cause the degradation of the high-temperature protective coating of the existing McrAlY alloy system, greatly reducing the coating. Protection performance
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0018] Substrate: K452 alloy, in the MCrAlY alloy system, M is Co, and the composition of the powder is (mass%):
[0019] Cr 26%, Al 8%, Y 0.6%, Co balance.
[0020] Preparation of CoCrAlY:
[0021] (1) Substrate pretreatment: After the substrate was polished with 800# sandpaper, it was ultrasonically cleaned in acetone and absolute ethanol for 10 minutes, and then dried for later use.
[0022] (2) Sandblasting: 100 mesh Al 2 o 3 Sandblasting, followed by ultrasonic cleaning with metal detergent, deionized water, and acetone for 15 minutes, rinsing with alcohol, and drying.
[0023] (3) Preparation of NiCrAlY bonding layer by supersonic spraying:
[0024] The powder particle size of the MCrAlY alloy system is 280 mesh. Coating thickness 0.15mm.
[0025] Using JP-5000 supersonic flame spraying equipment, the spraying process parameters are as follows: powder feeding rate 45g / min, oxygen pressure 200psi, oxygen flow rate 1750scfh, kerosene pressure 170psi, kerosene flow ra...
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Abstract
The invention discloses a high-temperature protective coating of an MCrAlY alloy system and a preparation method. The coating is characterized in the McrAlY coating comprises the components as follows: 20 percent to 30 percent of Cr (chromium), 4.0 percent to 10 percent of Al (aluminium), 0.3 percent to 0.7 percent of Y (yttrium), and M, wherein, M is at least one of the following three elements, namely Ni (nickel), Co (cobalt) and NiCo. As the preparation method adopts the supersonic spraying technology to prepare the coating, the coating is better combined with a matrix, the thickness of the coating can be controlled, and a thin film with an even thickness can be acquired on the large-area matrix. The coating disclosed by the invention still has a good salt-fog-corrosion resisting ability and high thermal-shock resistance even at a high temperature of 600 DEG C.
Description
technical field [0001] The invention relates to a high-temperature protection method for metals, in particular to a high-temperature protection coating of a McrAlY alloy system by supersonic flame spraying and a preparation method thereof. Background technique [0002] In modern industry, according to different working conditions, adopting different surface coating treatment technologies is an effective technical means to significantly improve the service temperature and service life of alloys. In addition to providing excellent resistance to high-temperature oxidation and corrosion, high-temperature protective coatings for metals also require long-term structural and chemical stability and good bonding with the substrate. Traditional metal high-temperature protective coatings include diffusion coatings (such as infiltration coatings) and alloy cladding coatings (such as MCrAIY coatings). The high-temperature protective coating of the McrAlY alloy system has the advantages ...
Claims
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IPC IPC(8): C23C4/12C23C4/08C22C19/05C22C19/07C23C4/02C23C4/073C23C4/129
Inventor 高淑春胡金玲彭建人
Owner 中建投(沈阳)科创产业发展有限公司