Materials Transactions Online

Materials Transactions, Vol.61 No.10 (2020) pp.2002-2007
© 2020 The Japan Institute of Metals and Materials

Surface Modification of Molybdenum by Iron-Powder Pack Treatment

Yasuhiro Morizono1, Takateru Yamamuro2 and Sadahiro Tsurekawa3

1Department of Materials System Engineering, National Institute of Technology, Kurume College, Kurume 830-8555, Japan
2Technical Division, Kumamoto University, Kumamoto 860-8555, Japan
3Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

Molybdenum sheets were embedded in mixtures of iron, graphite and alumina powders and heated at 1073-1373 K for 1.8-14.4 ks in a nitrogen flow. This process is a new surface modification technique called “Iron-powder pack (IPP) treatment”. The amount of alumina added as an anti-sintering agent was fixed in the powder mixtures, and the volume ratio of iron, graphite and alumina powders was varied from 0:10:2 to 6:4:2. An XRD pattern of the surface of the molybdenum sheet heat-treated at 1273 K for 3.6 ks using a 0:10:2 mixture had some small peaks for α-Mo2C. However, it could be identified by optical microscopy and scanning electron microscopy. On the other hand, the use of mixtures containing iron powder led to the formation of an α-Mo2C layer. When IPP treatment using a 4:6:2 mixture was carried out at 1273 K for 3.6 ks, the α-Mo2C layer with a thickness of approximately 14 µm formed on the molybdenum surface. The layer began to be observed at a heating temperature of 1073 K, and grew toward the inside of the molybdenum via the diffusion of carbon from the powder mixture. The sheet covered with the thick α-Mo2C layer showed a surface hardness of approximately HV = 1500.

[doi:10.2320/matertrans.MT-M2020177]

(Received 2020/06/05; Accepted 2020/07/29; Published 2020/09/25)

Keywords: molybdenum, iron powder, graphite, alumina, nitrogen gas, carbide formation

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