Contact fatigue property of diamond-like carbon films with different structure in cyclic impact conditions

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-10-11 DOI:10.1016/j.ijrmhm.2024.106921

Mingxiu Chong , Zhongrong Geng , Guangan Zhang , Xia Li , Xueqian Cao

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Abstract

Repeated contact with high loads can cause damage to the surface of the DLC films and thus affect their fatigue strength. This study systematically investigates the contact fatigue damage of the DLC films with different carbon structures (a-C, a-C:H, and ta-C) by macro-scale cyclic impact tests with alternating loads. The results reveal that the a-C film possesses significantly superior contact fatigue property compared to the a-C:H and ta-C films under high load. The graphitization transformation of the a-C and a-C:H films lead to a decrease in hardness and elastic modulus. The work-hardening of the ta-C films results in an increase in hardness and elastic modulus. The findings indicate that under cyclic load impact conditions, films need a combination of load support and fatigue resistance to achieve optimum lifetime, and solely increasing film hardness could be accompanied by brittle fracture and higher wear.

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不同结构的类金刚石碳膜在循环冲击条件下的接触疲劳特性

反复接触高载荷会对 DLC 薄膜表面造成损伤，从而影响其疲劳强度。本研究通过交变载荷的宏观循环冲击试验，系统地研究了不同碳结构（a-C、a-C:H 和 ta-C）的 DLC 薄膜的接触疲劳损伤。结果表明，在高负载条件下，a-C 薄膜的接触疲劳性能明显优于 a-C:H 和 ta-C 薄膜。a-C 和 a-C:H 薄膜的石墨化转变导致硬度和弹性模量下降。ta-C 薄膜的加工硬化导致硬度和弹性模量增加。研究结果表明，在循环载荷冲击条件下，薄膜需要结合载荷支撑和抗疲劳性能才能达到最佳使用寿命，而单纯提高薄膜硬度可能会导致脆性断裂和更高的磨损。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.