Micro-scale impact testing - A new approach to studying fatigue resistance in hard carbon coatings

被引：29

作者：

Beake, Ben D. ^{[1
]}

Liskiewicz, Tomasz W. ^{[2
]}

Bird, Andrew ^{[1
]}

Shi, Xiangru ^{[2
,3
]}

机构：

[1] Micro Mat Ltd, Willow House,Ellice Way, Wrexham LL13 7YL, Wales

[2] Univ Leeds, Sch Mech Engn, Inst Funct Surface, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire, England

[3] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Peoples R China

来源：

TRIBOLOGY INTERNATIONAL | 2020年 / 149卷

基金：

“创新英国”项目;

关键词：

Impact; Fatigue; DLC; Micro-scale; Micro-tribology; DIAMOND-LIKE CARBON; LOAD-BEARING CAPACITY; SLIDING-FRICTION CONDITION; CONTACT DAMAGE; MECHANICAL-PROPERTIES; DLC COATINGS; EROSION RESISTANCE; THIN-FILMS; TRIBOLOGICAL BEHAVIOR; WEAR BEHAVIOR;

D O I：

10.1016/j.triboint.2019.04.016

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Improving the fatigue resistance of DLC coatings under highly loaded repetitive contact is an important step to increasing their performance in demanding applications. The nano-impact test has been shown to be effective at highlighting differences in resistance to contact damage in thin hard carbon coatings deposited on hardened steel. A novel micro-scale rapid impact test capability capable of producing repetitive impacts at significantly higher strain rate and energy than in the nano-impact test has been developed recently enabling the study of coating fatigue with less sharp spherical indenters than in the nano-impact test. Results with the new micro-impact technique on two commercial hard carbon coatings (Graphit-iC and Dymon-iC from Teer Coatings) on tool steel are presented. The role of coating mechanical properties on the fatigue resistance and the load-sensitivity of the impact failure mechanism is discussed. The harder coating with higher sp(3)/sp(2) bonded C (Dymon-iC) was found to be significantly less durable under fatigue loading than the softer Graphit-iC. Reasons for the observed differences are discussed.

引用

页数：10

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