Diamond-like carbon coating layer for piston ring surface, piston ring and manufacturing process

Japanese Patent JP6333902

B2

The present invention relates to a diamond-like coating for piston ring surfaces, comprising, successively from the bottom to top, an underlayer, a gradient layer and an AM layer, wherein the AM layer is a diamond-like coating doped with doping elements. The doping elements are one or a combination of at least two selected from the group consisting of Cr, Si and Ti, and the content thereof shows a cyclical change in a form of a sine wave fluctuation along with the thickness change of the AM layer. As compared with the conventional single-layer structure or gradient layer structure, the AM layer of such diamond-like coating has a multi-cycle transition structure since the content of the doping elements in the AM layer of such diamond-like coating shows a cyclical change in a sin wave fluctuation form. On the basis of having high wear-resistant and low friction coefficient, it is beneficial to decrease the internal stress of the coating, increase the tenacity of the coating, ensure the increase of the thickness of diamond-like coating, and improve the durability of piston ring of diamond-like coating at the same time.

Kure Eiyuki
Liu Chiki
Shugetei
Zhang wave

JP2016170155A

May 30, 2018

August 31, 2016

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Yiqia New Department Shuanghuan Enclosure Co., Ltd.

C23C16/27; C23C14/02; C23C14/06; C23C14/14; C23C14/34; C23C16/02; C23C16/24; C23C16/32; C23C16/50; F02F5/00; F16J9/26

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JP2003289152A
JP1209707A
JP6330288A
JP2014098184A
JP2008024996A
JP2002256415A
JP2015055006A
JP2014088024A
JP2004022025A
JP2008081630A

EP0651069A1

Axis International Patent Business Corporation

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