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. A hard amorphous carbon film can be unthermally prepared at deposition rate of several handed <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 vacuum.2.据认为，图形碳黑色在无定形相的结构变化中沉积，包括由于高功率密度冲击而导致的碳原子的4倍和悬空键。这可以从薄膜特征（例如半导体抗性及其温度依赖性，退火中的放松行为和中等高的硬度）中证明。3。出于摩擦学应用的目的，在各种大气和摩擦条件下，通过给球样品作为往复式运动，以相同的位点描述了相同的位点，从而在各种大气和摩擦条件下进行了摩擦和磨损机制。并且，获得以下结果；（1）在正常的潮湿气氛中发现，摩擦的核心<mu>随着载玻片数量的增加而呈指数减小。认为这种行为遵守边界润滑机制，其中<mu>依赖物理式水蒸气的覆盖率估计约为36 kJ/mol的吸附热（2）在大约0.02的<mu>的出色低值<mu>与钻石样的含量类似于钻石较大的含量。这种最佳润滑意味着，吸收的摩擦解吸在低覆盖范围下的添加剂量相等。（3）在相对严重的条件下，例如湿度低，高速和高负载滑块，上等摩擦吸收使平衡状态的破裂。然后，<mu>从最佳磨损时逐渐增加。（4）这些结果表明，水蒸气不仅可以作为抑制剂作为该膜的基本润滑效率的抑制剂，而且由于吸附而发生的磨损会终止在膜表面终止活跃的Dungungling键。较少的