| Titre : | Development of al-alloy coating for advanced nuclear systems using lead alloys (2012) |
| Auteurs : | Yuji Kurata, Auteur ; Hitoshi Yokota, Auteur ; Tetsuya Suzuki, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of engineering for gas turbines and power (Vol. 134 N° 6, Juin 2012) |
| Article en page(s) : | 07 p. |
| Note générale : | Génie mécanique |
| Langues : | Anglais |
| Index. décimale : | 620.1 (Essais des matériaux. Défauts des matériaux. Protection des matériaux) |
| Tags : | Al-alloy Nuclear systems Lead alloys |
| Résumé : | Small and medium reactors using lead alloys as coolants are one of the promising reactor concepts with improved safety because of their thermal-physical and chemical properties. This paper focuses on the development of Al-alloy coating for nuclear systems using liquid lead-bismuth eutectic (LBE). Since corrosion attack becomes severe against structural steels at high temperatures in liquid LBE, it is necessary to improve the corrosion resistance of steels. An Al-alloy coating method using Al, Ti, and Fe powders, and laser beam heating has been developed. The main defects formed in the Al-powder-alloy coating process are surface defects and cracks. The conditions required to avoid these defects are the employment of the laser beam scanning rate of 20 mm/min and the adjustment of the Al concentration in the coating layer. According to the results of the corrosion tests at 550°C in liquid LBE, the Al-alloy coating layers on 316SS prevent severe corrosion attack such as grain boundary corrosion and LBE penetration observed in the 316SS without coating. The good corrosion resistance of the Al-alloy coating is based on the thin Al-oxide film, which can be regenerated in liquid LBE. From the viewpoint of the soundness of the produced Al-powder-alloy coating layers and the preservation of their corrosion resistance, it is estimated that the range of adequate Al concentration in the coating layer is from 4 to 12 wt. %. |
| DEWEY : | 620.1 |
| ISSN : | 0742-4795 |
| En ligne : | http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000134000006062902000001&idtype=cvips&gifs=Yes&ref=no |
