Adachi/Murashima Laboratory
Laboratory of Tribology and Nanointerface Engineering
Department of Mechanical Systems Engineering
Graduate School of Engineering, Tohoku University
Koshi ADACHIContact info:
Koshi Adachi, Motoyuki Murashima
Phone: 022-795-6956
E-mail: koshi.adachi.e4@tohoku.ac.jp
motoyuki.murashima.b3@tohoku.ac.jp

Creation of Advanced Mechanical Systems
through Control of Nanointerface

Motoyuki MURASHIMAHigh Speed, High Precision
Mechanical Systems

High Reliability, High Durability Mechanical Systems（Next Generation Self-Repairing Systems）

Next Generation
Medical Devices

Ultra Low Friction
Mechanical Systems

Optimization Technology of Nanointerface (Highly-functionalized Surface/Interface)
and Tribologically-based Machine Designfor Creation of Highly Functionalized, Environmentally ta-CNx
Friendly Mechanical Systems
60 [nm]60 [nm]60nm

600001122300 mm

10 nm

20 nm

Control ofSurface Texture

Control of Frictional
Chemical Reactions

Control ofFrictional Heating

01323[mm]Control ofNano-structure

1[mm]
3 mm

Control0 cycleof
Micro-Plasma

013323 mm

Controlof
100 cycle
Additive Molecules

HOPG

Self-healing Low Frictional Technologyfor Environmentally-friendly Engine Systems-Design for Highly-Efficient and Reliable Mechanical System-

Creation of Surface and Interface for Low Friction
15 [nm]15 [nm]-Design of Environmental-FriendlyMechanical
System-Surface texture for running-in control realizes reliable and low friction system

0Water or Nitrogen
Gas Realizes Oil Free0 Mechanical System

Sliding direction of disk
Ball: FC250
Disk: AC8A
Load: 15 N

Sliding speed: 0.1 m/s
Lubricant: Fully-formulatedoilo
Temperature: 80 CAl

12Laser texture

1[mm]Al1 mm132Protect023[mm]0 cycle

013 layer

2Nanolayer100 cycle

150 mm

250 mmMoDTC (Friction modifier)

Tribo-chemical
Product3500 mm

01

Formed surface texture

Streak texture

15SiCsurface

10 nm

SMoS2

https://global.toyota/jp/
250 mmLaser texture
OSFeBAAA

20 mm

B

5 mm

5 mm

5 mm

B

10 mm

10 mm

5 mm

Sliding direction of ball

BA

5 mm

Low friction (m=0.0002) is realized in water lubrication
under contract pressure of 20 MPa
by combined surface texture on SiC

Surface texture enhances formation of tribochemical products
by suppression of aluminum adhesion

Thin hard coating and controlled environment realizes
low friction(m=0.004) under dry lubrication

Self-formation of Low Frictional Protein Filmfor Next-generation Assistant Heart-Design for Improvement of QOL-Development of Ultra-low Frictional Coating in Vacuumfor Highly-reliable Space Mechanisms-Design of Self Healing Low Friction SystemSelf formation of low friction interface
improves reliability and durability of space apparatus

Controlled protein adsorption realizes highly-functionalized
and reliable next-generation medical device
Friction track

Sliding direction of counter surfaceHeartSuction

Plasmaprotein

Protectivelayer

Tiltedlayer

Sliding directionof pinSubstrate(SiC)

http://jscvs.umin.ac.jp

Top surface of coatings
after friction

Parallellayer

Topsurface

宇宙航空研究開発機構

Lamellar structureof MoS2100 mm

Thickness≓2 nm● Mo ○ S

Coatingon disk

1.54 Å(Mo-S)

Controlled protein adsorption
Surface texture

6.16 Å(Mo-Mo)

Discharge
2 mmFibrinogen

10 mmAlbumin

Design of interface based on protein adsorption control
realizes low and stable friction in blood environment

10 mm

5 nm

5 nm

MoS2(t ≓ 1 mm)

MoS2-DLC(t≓ 500 nm)

Dispersed soft metal in carbon hard coating realizes
low friction coefficient (<0.05) in vacuum condition

For details about these or other themes, please visit our website. http://www.tribo.mech.tohoku.ac.jp