Friction and Deformation Behaviors of ∼60-μm Stainless Steel Micro-balls for Application in Small Precision Devices

Dae San Oh, Hyun Joon Kim, Jae Kang Kim, Dae Eun Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Abstract The friction and deformation behaviors of ∼60-μm-diameter stainless steel micro-balls were assessed under various rolling conditions against Si specimens. In the friction tests, the micro-balls were placed between a stationary flat silicon specimen on the top and a flat or grooved silicon specimen at the bottom that was made to move in a reciprocating motion. Rectangular- and V-shaped grooves were fabricated on the silicon specimen by a photolithographic process, and the effect of groove shape on the frictional behavior of the micro-balls was investigated. Friction coefficient of 0.01 could be successfully achieved when proper rolling was attained. It was found that the number of micro-balls was not a critical factor as long as more than three balls were placed between the two flat Si specimens. Furthermore, rectangular-shaped groove resulted in lower friction than V-shaped groove. This was due to severe deformation of the micro-ball which led to increase in the contact area when the V-shaped groove was used. The results of this work were expected to aid in the development of miniature bearings for applications in small precision systems.

Original languageEnglish
Article number573
JournalTribology Letters
Volume59
Issue number3
DOIs
Publication statusPublished - 2015 Sep 6

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Stainless Steel
balls
stainless steels
Silicon
friction
grooves
Stainless steel
Friction
Miniature bearings
silicon
coefficient of friction

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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abstract = "Abstract The friction and deformation behaviors of ∼60-μm-diameter stainless steel micro-balls were assessed under various rolling conditions against Si specimens. In the friction tests, the micro-balls were placed between a stationary flat silicon specimen on the top and a flat or grooved silicon specimen at the bottom that was made to move in a reciprocating motion. Rectangular- and V-shaped grooves were fabricated on the silicon specimen by a photolithographic process, and the effect of groove shape on the frictional behavior of the micro-balls was investigated. Friction coefficient of 0.01 could be successfully achieved when proper rolling was attained. It was found that the number of micro-balls was not a critical factor as long as more than three balls were placed between the two flat Si specimens. Furthermore, rectangular-shaped groove resulted in lower friction than V-shaped groove. This was due to severe deformation of the micro-ball which led to increase in the contact area when the V-shaped groove was used. The results of this work were expected to aid in the development of miniature bearings for applications in small precision systems.",
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Friction and Deformation Behaviors of ∼60-μm Stainless Steel Micro-balls for Application in Small Precision Devices. / Oh, Dae San; Kim, Hyun Joon; Kim, Jae Kang; Kim, Dae Eun.

In: Tribology Letters, Vol. 59, No. 3, 573, 06.09.2015.

Research output: Contribution to journalArticle

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N2 - Abstract The friction and deformation behaviors of ∼60-μm-diameter stainless steel micro-balls were assessed under various rolling conditions against Si specimens. In the friction tests, the micro-balls were placed between a stationary flat silicon specimen on the top and a flat or grooved silicon specimen at the bottom that was made to move in a reciprocating motion. Rectangular- and V-shaped grooves were fabricated on the silicon specimen by a photolithographic process, and the effect of groove shape on the frictional behavior of the micro-balls was investigated. Friction coefficient of 0.01 could be successfully achieved when proper rolling was attained. It was found that the number of micro-balls was not a critical factor as long as more than three balls were placed between the two flat Si specimens. Furthermore, rectangular-shaped groove resulted in lower friction than V-shaped groove. This was due to severe deformation of the micro-ball which led to increase in the contact area when the V-shaped groove was used. The results of this work were expected to aid in the development of miniature bearings for applications in small precision systems.

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