Asimco Shuanghuan Piston Ring(yizheng) Co., Ltd.

Kaishun Li

Qianxi Liu

Bo Zhang

Guanfei Shi

Yueting Zhou

A piston ring with a hard plating and a preparation method therefor are provided. An OD surface of the piston ring includes an interlayer, a gradient metal nitride layer and a DLC repetitive unit layer sequentially from bottom to top; one DLC unit layer in the DLC repetitive unit layer sequentially includes a DLC layer and a metal-doped DLC layer; and chrome plating of a side face of the piston ring is a chrome plating on a side face of a piston ring matrix. The repetitively circulating DLC layers and metal-doped DLC layers are a combination of a micron-thickness layer and a nanometer-thickness layer to form a micro-nano layered structure, so that the binding force between each plating is enhanced and the internal stress of the plating is reduced; and meanwhile, metal doping in the DLC layer can effectively reduce the plating stress and solve the problem of plating peeling.

Piston ring with hard plating, and preparation method therefor

Provided are a friction reduced and wear resistant coating, a preparation method thereof and a piston ring. The coating includes an adhesive layer, a transition layer, a gradient layer and a function layer in sequence. The gradient layer is a CrMoN layer in which Mo content progressively increases. The function layer includes at least one cyclical layer. Each cyclical layer includes a first CrMoN layer and a second CrMoN layer in sequence from bottom to top. The Mo content of the first CrMoN layer is lower than the Mo content of the second CrMoN layer. The coating provided by the present invention has a friction coefficient of 0.3 to 0.45, 10% to 30% lower than a CrN coating, and has an overall hardness of up to 1400 HV to 2600 HV and a thickness of 80 &#x3bc;m, satisfying the required durability for the full lifecycle of the piston ring. The preparation process of the coating is simple and highly operable, and thus is convenient for industrialization.

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Jiangsu, China

Kaishun Li