1995 Fiscal Year Final Research Report Summary
Analysis of Microscopic Wear Mechanism of Ceramics Based on Friction Tests in the SEM
| Project/Area Number |
06650159
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | Yamagata University |
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Principal Investigator |
HOKKIRIGAWA Kazuo Yamagata University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60173605)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Ceramics / Tribology / Wear / Wear Rate / Wear Mechanism |
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| Research Abstract |
The purpose of this investigation is to analyze microscopic wear mechanism of ceramic materials. Following results were obtained ;
(1) Microscopic wear modes of ceramics can be classified into following three modes ;
1) flake formation : This is the severest wear mode of ceramics by macroscopic surface crack propagation.
2) powder formation : This is caused by microscopic surface crack propagation.
3) plowing : This is mild wear of ceramics.
(2) The condition for occurrence of flake formation can by expressed by using new dimensionless parameter Sc (=Pmax (Rmax) ^<1/2>/K_<IC>) where Pmax is maximum hertzian contact pressure, Rmax is maximum surface roughness and K_<IC> is fracture toughness.
(3) The condition for occurrence of powder formation cab be expressed by using new dimensionless parameter Sc^* (=Hv (Rmax) ^<1/2>/K_<IC>) where Hv is Vickers hardness, Rmax is maximum surface roughness and K_<IC> is fracture toughness.
(4) New wear equation can be obtained for estimation of wear rate of ceramics based on the above results.
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