Frictional and Protective Characteristics of Hard Amorphous Carbon Film Deposited by High-velocity Impact of Carbon-black Particles

炭黑颗粒高速冲击沉积硬质非晶碳膜的摩擦和防护特性

• 批准号: 60550094
• 负责人: IDE Takashi
• 金额: $ 1.22万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550094/
• 关键词: Hard Carbon Film; Amorphous Semiconductive Carbon Film; Ultra-Fine Particle; Carbon Black; Electrostatic Acceleration Of Powder Particle; High-Velocity Impact; Boundary Lubrication; 固体潤滑膜

1. A hard amorphous carbon film can be unthermally prepared at deposition rate of several handred <ang> /min by electrostatically accelerating ultra-fine carbon-black particles to high velocity in a uniform electric field of the order of <10^6> V/m, by making the energetic particles mechanically collide with cold cathode (substrate) in vacuo.2. It is considered that graphitic carbon-black is deposited with the structural change in an amorphous phase including excessive 4-fold and dangling bonds of carbon atoms due to high power density impact. This can be proved from the film characteristics such as the semi- conductive resistivity and its temperature dependence, their relaxation behaviour in annealing and the moderately high hardness.3. For the purpose of tribological application, the frictional and the wear occurring mechanisms of the film are investigated under various atmospheric and frictional conditions with a ball-on-disk sliding friction test, by giving the ball sample a recipr … More ocating motion in the manner that the contact point describes a same locus repeatedly. And, the following results are obtained;(1) It is found in normal humid atmosphere that the coefficient <mu> of friction decreases exponentially as the number of slides increases. This behaviour is considered to obey the boundary lubrication mechanism in which the <mu> depends on the coverage ratio of physisorbed water vapour as estimated the adsorption heat of about 36 kJ/mol.(2) Excellent low values of <mu> of about 0.02 are presented at large number of slides as similar to diamond-like carbon films. This optimum lubrication means that the frictional desorption of the absorbate reaches in equilibrium with the adsorption at a low coverage state.(3) In relatively severe condition such as low humidity, high speed and high load slidings, superior frictional desorption brings the break of the equilibrium state. Then, the <mu> increases gradually from the optimum value as a mild wear occurs.(4) These results suggest that water vapour acts as an inhibitor not only to the essential lubrication efficiency of this film, but to the wear occurring as the adsorption will terminate active dungling bonds at film surface. Less

1.通过在真空中使含能粒子与冷阴极(衬底)机械碰撞，在~lt；10~6&gt；V/m量级的均匀电场中，将超细碳黑粒子静电加速至高速，以几手/分钟的沉积速率低温制备硬质非晶碳膜。认为由于高功率密度的冲击，石墨炭黑的沉积是以非晶态结构变化的，包括过量的碳原子的四重键和悬挂键。这一点可以从薄膜的半导体电阻率及其与温度的关系、其在退火过程中的弛豫行为和中等高的硬度等特性中得到证明。为了满足摩擦学应用的需要，用球盘滑动摩擦试验机研究了不同大气和摩擦条件下的摩擦磨损机理，给出了球状样品的配方…。以接触点重复描述同一轨迹的方式进行更多的定位运动。得到了以下结果：(1)在正常潮湿大气中，摩擦系数随滑动次数的增加呈指数下降。这种行为被认为遵循边界润滑机制，在边界润滑机制中，-lt；Mu&gt；取决于物理吸附水蒸气的覆盖率，估计其吸附热约为36kJ/mol。(2)在大量的载玻片上，表现出约0.02的极低的&lt；Mu&gt；值，类似于类金刚石碳膜。这种最佳的润滑意味着在低覆盖状态下，吸附液的摩擦脱附与吸附达到平衡。(3)在低湿度、高速、高负荷滑动等相对恶劣的条件下，优越的摩擦脱附会导致平衡状态的破坏。结果表明，水蒸气不仅对膜的基本润滑效率有抑制作用，而且对膜表面的磨损也有抑制作用，因为吸附作用会终止膜表面的活性粘结键。较少