トライボロジスト
Online ISSN : 2189-9967
Print ISSN : 0915-1168
ISSN-L : 0915-1168
62 巻 , 12 号
特集・燃費低減のためのエンジントライボロジー技術
選択された号の論文の15件中1~15を表示しています
会告
目次
連載・トライボロジーを語る
特集・燃費低減のためのエンジントライボロジー技術
解説
解説
  • 松原 亨, 岩井 善郎
    2017 年 62 巻 12 号 p. 773-779
    発行日: 2017/12/15
    公開日: 2017/12/15
    ジャーナル 認証あり

    The development of new tribo-materials will accelerate the progress of tribological performance, and thus it is very important to clarify the mechanical characteristics of tribo-materials and determine the positioning of the mechanical properties. Here, the positioning of the mechanical properties of the various materials means a ranking of intrinsic material properties such as Young’s modulus, hardness, fracture toughness and so on. From this background, researches have been conducted on “Micro Slurry-jet Erosion; MSE” method, focusing on the accumulation of data regarding the mechanical characteristics of material surfaces for thin films, ceramics, resins and so on. Material positioning in the MSE maps obtained by the erosion rates of the MSE tests for various materials are demonstrated and discussed.

トライボロジー・ナウ・トライボロジー海外体験記 ―アラウンド・ザ・ワールド―
学術論文
  • 小野 京右
    2017 年 62 巻 12 号 p. 784-799
    発行日: 2017/12/15
    公開日: 2017/12/15
    [早期公開] 公開日: 2017/11/02
    ジャーナル フリー

    Diamond-like-carbon (DLC) is widely used as a hard protective layer with a relatively low surface energy. In the head/disk interface in magnetic disk storages, however, monolayer perfluoro-polyether lubricant with a high bond ratio is coated on DLC to avoid DLC‒DLC contact to secure head/disk wear reliability. This paper theoretically analyzes the effect of lubricant thickness and bond ratio on the adhesion force between head and disk surfaces in a sub-nanometer thickness regime. It was found that although the adhesion force can be reduced by increasing bond ratio to one, the adhesion force has the lowest sensitivity to lubricant thickness variations at 0.85 bond ratio. In addition, the maximum adhesion force can be minimized when lubricant thickness is ~0.6nm. This suggests that the current lubricant thickness of 1.0-1.2nm can be reduced to 0.6nm accompanying with a slight decrease in the adhesion force and a slight increase in allowance to lubricant thickness variation. This tribo-surface design concept can be applied to other fields such as micro/nano electrical-mechanical systems.

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