Nickel-aluminum-based self-lubricating abrasion-resistant coating on surface of piston ring and preparation method
A wear-resistant coating and piston ring technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of poor bearing capacity, poor wear-resistant and wear-reducing performance, and difficult to store lubricating oil, etc., to achieve Reduce friction and wear, good lubricating performance, improve the effect of public conditions
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[0025] The invention provides a coating preparation method, comprising: using nitrogen as powder to transport protective gas, argon and hydrogen as plasma spraying gas, using plasma flame to melt and spray formula materials on the surface of piston ring to obtain a piston ring surface coating . The present invention adopts thermal spraying process, and has certain requirements on spraying distance and spraying time. The spraying distance is controlled at 80-120mm, preferably at 90-100mm, and the spraying time is controlled at 10-20min. The spraying distance described in the present invention is the distance from the center of the plasma flame flow to the surface of the piston ring, and the temperature is the actual temperature of the piston ring during the coating preparation process.
[0026] When using the plasma spraying process to spray, the pressure of argon gas is 0.5-0.8 MPa; the pressure of nitrogen gas is 0.5-0.75 MPa; the pressure of hydrogen gas is 0.3-0.6 MPa. Th...
Embodiment 1
[0028] Ni powder with an average particle size of 30 μm, Mo powder with an average particle size of 22 μm, Al powder with an average particle size of 25 μm, Ag powder with an average particle size of 20 μm, and h-BN powder with an average particle size of 18 μm, according to 77wt%Ni, 4wt%Mo, 4wt%Al, 10wt%Ag, 5wt%h-BN were mechanically ball milled, mixed evenly, dried in a vacuum dryer to remove moisture;
[0029] The dry mixed powder is sprayed on the surface of the piston ring by a plasma spraying process to form a coating with a thickness of 200 μm. The specific spraying parameters are as follows: the air pressures of argon, nitrogen and hydrogen are 0.75MPa, 0.7MPa and 0.5MPa respectively; the powder flow rate is 15g / min; the spraying distance is 120mm; the spraying time is controlled as 15min; the rotation frequency of the piston ring is 25Hz ; The axial moving speed of the piston ring is 3mm / s.
[0030] The coating that obtains, adopts high-temperature ball-on-disk frict...
Embodiment 2
[0032] Ni powder with an average particle size of 35 μm, Mo powder with an average particle size of 20 μm, Al powder with an average particle size of 22 μm, Ag powder with an average particle size of 25 μm, and h-BN powder with an average particle size of 19 μm, according to 77wt %Ni, 4wt%Mo, 5wt%Al, 10wt%Ag, 4wt%h-BN were ball milled and mixed;
[0033] The mixed powder is sprayed on the surface of the piston ring by using a plasma spraying process to form a coating with a thickness of 200 μm. The specific spraying parameters are as follows: the pressures of argon, nitrogen and hydrogen are respectively 0.7MPa, 0.6MPa and 0.4MPa; the powder flow rate is 10g / min. The spraying distance is 100mm; the time is 10min, the rotation frequency of the piston ring is 20Hz, and the axial movement speed of the piston ring is 4mm / s.
[0034] The coating that obtains adopts high-temperature ball-on-disk friction and wear testing machine to measure the friction coefficient and wear resistan...
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