논문 국내 국제전문학술지(SCI급) Oxidation Behaviors of Si/Al Pack Cementation Coated Mo-3Si-1B Alloys at Various Temperatures
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2019-09
- 저자명 박준식,양원철,최광수,백경호,김영무,이성,이종원,김정민
- 학술지명 metals and materials international
- 발행처명 KOREAN INST METALS MATERIALS
- 발행국가 국내
- 논문언어 외국어
- 전체저자수 8
홈페이지
논문 초록 (Abstract)
In this study, we tried to improve the oxidation resistance of Mo?3Si?1B (wt%) alloy at intermediate (800?°C) and high temperature (1300?°C) after applying Si/Al pack cementation coatings. In addition, we examined structural changes and phase change in the intermediate and high temperature oxidizing atmospheres to observe oxidation behaviors. The diffusion pack coatings were carried out with an NH4F activator and both Si and Al powder mixtures. Mo?Si?B alloys were subjected to diffusion coatings of Si/Al powders at various temperatures in various time conditions at a temperature of 1100?°C. When the pack coatings were carried out for 48?h, Mo(Si, Al)2 and Mo3Al8 layers together with a T2 (Mo5SiB2) layer were successfully synthesized on the substrate. After oxidation tests, an Al2O3 protective oxide layer was formed by the diffusion of Al in an ambient atmosphere. The Si/Al pack cementation coatings provided excellent oxidation resistance through the formation of an Al2O3 oxide layer. The enhanced oxidation behaviors are discussed in terms of microstructural evolution at high temperatures.