발간논문

Home > KJMM 논문 > 발간논문

Vol.34, No.3, 407 ~ 415, 1996
Title
Research Paper - Surface Treatment - : Thermal Fatigue and Hot Hardness Behaviors of Plasma Sprayed Zirconia Coatings on Gray Cast Iron Substrate
김형준Hyung Jun Kim, 권영각Young Gak Kweon
Abstract
Two kinds of plasma-sprayed zirconia coating which are ZrO₂-8%Y₂O₃ and ZrO₂-24%MgO are studied to increase the thermal fatigue properties of gray iron in the presence of water spray. The results of thermal cycling tests from room temperature to 1100℃ indicate that ZrO₂-8%Y₂O₃ coating behaves better than ZrO₂-24%MgO and the phase transformation after the tests for both coatings is negligible even in the presence of water. The failure of ZrO₂-24% MgO coating has occurred by the formation of iron oxide layer between the bond coating and the gray iron substrate and then the cracks have propagated through the brittle iron oxide layer and the substrate although blunting of the cracks seems to have occurred in the bond coating. On the other hand, iron oxide layer is not observed for ZrO₂-8%Y₂O₃ coating and thus the cracks in the ceramic top coating have blunted in the bond coating. Also, temperature-variant indentation experiments over the temperature range of 20℃ to 800℃ are reported and analysed using an activation energy approach.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.