相对湿度对带有氢化氮化碳涂层的摩擦学系统中低摩擦界面的形成及其连续性的影响

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Kazuya Kuriyagawa, Tatsuki Tamagawa, Koshi Adachi
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引用次数: 0

摘要

通过在相对湿度可控的空气和氮气环境中进行摩擦试验,阐明了相对湿度对氢化氮化碳(CNx:H)涂层与 Si3N4 球滑动形成低摩擦界面的影响以及形成的连续性。在空气环境中,在低于临界湿度(1.0%-3.0% RH)的条件下,Si3N4 上形成了由最初的 CNx:H 转变而来的碳质摩擦层,从而产生了较低的摩擦力(μ < 0.05)和较低的球比磨损率(< 2 × 10-9 mm3/N-m)。相反,这种摩擦层在相对湿度超过 3.0% 时就无法形成。在氮气环境中,在 0.25-1.0% 相对湿度范围内,摩擦层在磨损进行的同时继续形成,在超过 50,000 次循环中保持低摩擦。然而,在低于这一湿度范围内,由于摩擦层的结构发生变化,低摩擦寿命受到限制。因此,相对湿度不仅影响低摩擦界面的形成,还影响形成的连续性。在氮气环境下的持续低摩擦过程中,CNx:H 摩擦表面最上层几纳米的摩擦化学反应导致环境中水和氧分子的氢、羟基和氧基团继续发生化学吸附,而 CNx:H 中的氢含量则发生解吸。这项研究通过实验证实了在使用 CNx:H 涂层的摩擦学系统中控制相对湿度对实现低摩擦和通过持续形成低摩擦界面提高低摩擦耐久性的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Impact of Relative Humidity on the Formation of Low-Frictional Interface and its Continuity in Tribological Systems with Hydrogenated Carbon Nitride Coatings

Impact of Relative Humidity on the Formation of Low-Frictional Interface and its Continuity in Tribological Systems with Hydrogenated Carbon Nitride Coatings

The impact of relative humidity on the formation of low-frictional interface in hydrogenated carbon nitride (CNx:H) coatings sliding against Si3N4 balls and the formation continuity was elucidated through friction tests conducted in both air and nitrogen atmospheres with controlled relative humidity levels. In air atmosphere, a carbonaceous tribolayer with a transformed structure from the initial CNx:H was formed on Si3N4 at less than the critical humidity that existed in 1.0–3.0% RH, resulting in low friction (μ < 0.05) and a low specific wear rate of the balls (< 2 × 10–9 mm3/N·m). In contrast, this tribolayer failed to form above 3.0% RH. In nitrogen atmosphere, within the 0.25–1.0% RH range, the tribolayer continued to form concurrently with wear progression, maintaining low friction for over 50,000 cycles. However, in less than this humidity range, the lifetime of low friction was limited owing to the tribolayer’s structural alteration. Thus, relative humidity influences not only the formation of the low-frictional interface but also the formation continuity. On the CNx:H friction surface, hydrogen, hydroxyl, and oxygen groups from environmental water and oxygen molecules continued to chemisorb owing to tribochemical reactions on the uppermost few nanometers during continuous low friction in a nitrogen atmosphere, while hydrogen content of CNx:H desorbed. This study experimentally confirmed the critical role of controlling relative humidity in tribological systems using CNx:H coatings to achieve low friction and improve its durability of low friction through the continuous formation of the low-frictional interface.

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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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