Method for increasing wear resistance of surface of crankshaft using ceramic coating

A method for increasing wear resistance of a surface of a crankshaft using a ceramic coating, comprising:

• dividing a journal of a crankshaft before spraying into a journal coating portion and two journal grinding portions, wherein the two journal grinding portions are located on two sides of the journal coating portion respectively;
• and a surface of each journal grinding portion is higher than a surface of the journal coating portion, the surface of the journal grinding portion is higher than a surface of a journal of a finished crankshaft, a surface of a rounded corner of the crankshaft before spraying is higher than a surface of a rounded corner of the finished crankshaft, and a size of the journal coating portion is smaller than a size of the journal of the finished crankshaft in a radical direction of the journal;
• and
• spraying a ceramic coating on the surface of the journal coating portion, grinding a surface of the journal of the crankshaft and the surface of the rounded corner after the ceramic coating is sprayed until a surface of the ceramic coating and the surface of the rounded corner are seamlessly joined, and performing polishing to obtain the finished crankshaft,
• wherein the spraying a ceramic coating on the surface of the journal coating portion comprising:
• spraying a metal bonding bottom layer on the surface of the journal coating portion, wherein a thickness of the metal bonding bottom layer in the radical direction of the journal ranges from 0.05 to 0.10 mm;
• and
• spraying a uniform and dense ceramic coating on the surface of the journal coating portion, wherein a temperature of a heat source for spraying ranges from 2000° C. to 3500° C., and a temperature of the surface of the journal coating portion ranges from 80° C. to 150° C.,
• wherein the metal bonding bottom layer increases a binding force between the ceramic coating and journal coating portion.