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Rolling Contact Fatigue and Contact Wear of Ceramics and Plasma Sprayd Ceramic Coating

Research Project

Project/Area Number 06650778
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Structural/Functional materials
Research InstitutionNagoya University

Principal Investigator

MIYATA Takashi  Nagoya University, Dept.Materials Sci.& Eng., Prof., 工学部, 教授 (20023228)

Co-Investigator(Kenkyū-buntansha) TAGAWA Tetsuya  Nagoya University, Dept.Materials Sci.& Eng., Assistant Prof., 工学部, 助手 (00216805)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsRolling contact fatigue / Wear / Silicon nitrides / Sialon / Alumina sprayd coating / Micro fatigue crack / Mode II shear crack / 窒素珪素 / セラミックス / モードIIき裂
Research Abstract

Disk-type rolling contact test apparatus has been newly developed for ceramic materials. For two types silicon nitrides, a sialon and a plasma sprayd alumina coating material, rolling contact fatigue tests were performed to investigate mechanisms of contact fatigue for brittle materials. Furthermore, pin-on disk type wear tests were performed for the silicon nitride and the alumina coating.
Both type of ceramics showed a fatigue behavior similar to that of metallic materials. From fractographic and metallographic observations, it has been found that the crack initiation in the silicon nitrides subjected to rolling contact is induced depending on cyclic subsurface shear stress, as is known in steel bearings. On the mid sections of off-loaded specimens before the final failure, many subsurface micro cracks which lay parallel to the contact surface were found at depth where the fluctuated Herzian shear stress was maximum. Growth of these micro cracks with the increase of cyclic number was confirmed using multiple specimens. The specimens subjected to higher frequency rolling gave shorter failure lives. Although the cyclic fatigue of ceramics under pulsating uniaxial stress seems to be governed by environmentally assisted cracking, these experimental results in rolling contact fatigue suggest that cyclic dependent type of fatigue in ceramics is alternatively possible under the mixed stress state of shear and compressive stresses.
In alumina sprayd coating, rolling contact fatigue strength was also decreased with the increase of cyclic number. Fracture initiated from the interface between the alumina and Mo interlayr. Both of the silicon nitride and the alumina coating show high resistance for friction wear under the condition of high velocity friction in water.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 兪成根: "窒化けい素およびサイアロンの転がり疲労" 日本金属学会誌. 58. 621-628 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Sung-Keun Yoo: "Rolling Contact Fatigue in Silicon Nitride and Sialon" Jour.Japan Inst.Metals, 58-6. 621 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 兪 成根: "窒化けい素およびサイアロンの転がり疲労" 日本金属学会誌. 58. 621-628 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 兪 成根: "窒化けい素およびサイアロンの転がり疲労" 日本金属学会誌. 58. 621-628 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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