Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Processing and Characterization of Sol-Gel Derived Ferroelectric PMN Powders and Thin Films

졸-겔법에 의한 강유전성 PMN 분말 및 박막의 제조와 특성

  • 황진명 (인하대학교 무기재료공학과) ;
  • 장준영 (인하대학교 무기재료공학과) ;
  • 은희태 (인하대학교 무기재료공학과)
  • Published : 1998.12.01
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Abstract

The sliding wear behavior of Ni-base hardfacing alloy, Deloro 50, was investigated at the contact stresses of 15ksi and 30ksi under the various wear environments. In air at room temperature, Deloro 50 showed lower wear resistance than Stellite 6 even at 15ksi due to the occurrence of severe adhesive wear. This seems to be caused by the lower hardness and work- hardening rate of Deloro 50 than those of Stellite 6. In water at room temperature, Deloro 50 showed as good wear resistance as Stellite 6 at 15ksi. It was considered to be due to that water could effectively prevent metal to metal contact through contacting asperities. However, Deloro 50 showed severe adhesive wear at 30ksi in water at room temperature. It seems to be that the water could not suppress adhesion wear at 30ksi. At $300^{\circ}C$ in air, Deloro 50 exhibited higher wear resistance than Stellite 6 even at 30ksi. It was considered that the oxide glaze layers formed on wear surface during sliding, effectively prevented direct metal-to-metal contacts.

Ni계 경면합금인 Deloro 50의 마모거동을 15ksi와 30ksi 접촉응력하의 여러 마모조건에서 조사하였다. 상온대기중에서 Deloro 50는 15ksi 응력에서도 극심한 응착마모가 발생하는 매우 낮은 마모저항성을 보였는데 이는 fcc 결정구조를 갖는 Deloro 50 기지상의 경도와 가공경화율이 strain-induced 상변태를 이웅한 hcp 결정구조의 Stellite 6보다 낮기 때문으로 생각된다. 상온 수중에서 Deloro 50는 15ksi 응력에서 Stellite 6와 비슷한 마모저항성을 보였는데 이는 물이 미세요철간의 금속간 접촉을 억제하였기 때문으로 생각된다. 그러나, 30ksi의 높은 접촉응력에서는 상온 대기중길 같은 응착마모가 발생하는 것으로 보아, 30ksi의 높은 응력에서는 물의 응착마모 억제 효과가 없었기 때문으로 생각된다. $300^{\circ}C$ 대기중에서 Deloro 50는 30ksi의 높은 접촉응력에서도 Stellite 6보다 우수한 마모저항성을 보였는데 이는 고온에서 마모시 생성되는 복합산화물층이 효과적으로 금속간 접촉을 방해하여 응착마모를 억제하였기 때문으로 생각된다.

Keywords

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