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Development of Novel Composite Powder Friction Modifier for Improving Wheel-rail Adhesion in High-speed Train

고속열차 점착계수 향상을 위한 신규 복합재료 분말 마찰조절재 개발 및 점착력 특성 평가

  • Oh, Min Chul (Department of Materials Science and Engineering, Ajou University) ;
  • Ahn, Byungmin (Department of Materials Science and Engineering, Ajou University)
  • 오민철 (아주대학교 신소재공학과) ;
  • 안병민 (아주대학교 신소재공학과)
  • Received : 2018.10.19
  • Accepted : 2018.11.21
  • Published : 2018.12.28

Abstract

With the recent remarkable improvements in the average speeds of contemporary trains, a necessity has arisen for the development of new friction modifiers to improve adhesion characteristics at the wheel-rail interface. The friction modifier must be designed to reduce slippage or sliding of the trains' wheels on the rails under conditions of rapid acceleration or braking without excessive rolling contact wear. In this study, a novel composite material consisting of metal, ceramic, and polymer is proposed as a friction modifier to improve adhesion between wheels and rails. A blend of Al-6Cu-0.5Mg metallic powder, $Al_2O_3$ ceramic powder, and Bakelite-based polymer in various weight-fractions is hot-pressed at $150^{\circ}C$ to form a bulk composite material. Variation in the adhesion coefficient is evaluated using a high-speed wheel-rail friction tester, with and without application of the composite friction modifier, under both dry and wet conditions. The effect of varying the weighting fractions of metal and ceramic friction powders is detailed in the paper.

Acknowledgement

Supported by : 국토교통부

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