Nickel-aluminides/steel clad pipe fabricated by reactive centrifugal casting method from liquid aluminum and solid nickel |
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Authors: | Yoshimi Watanabe Satoru Watanabe Kiyotaka Matsuura |
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Affiliation: | (1) the Department of Functional Machinery and Mechanics, Shinshu University, 386-8567 Ueda, Japan;(2) the Division of Materials Science and Engineering, Hokkaido University, 060-8628 Sapporo, Japan |
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Abstract: | A novel method to produce an aluminide/steel clad pipe has been proposed. The method is based on a combination of the self-propagating
high-temperature synthesis (SHS) reaction and centrifugal casting, and is named the reactive centrifugal casting method. Nickel
powder was placed on a rotating steel pipe, and aluminum liquid was poured into the steel pipe. The aluminum liquid and nickel
powder exothermically reacted and produced a composite layer consisting of nickel aluminides on the inner surface of the steel
pipe. The heat generated by the exothermic reaction melted the inner surface of the steel pipe and bonded the composite layer
to the steel. It was found that increases in centrifugal force generated by rotating the steel pipe, the pouring temperature
of the aluminum, and the preheating temperature of the nickel and steel remarkably promote the reaction between nickel and
aluminum. In addition, the amounts of initial aluminum and nickel were found to play an important role in controlling the
microstructure of the composite layer. Thus, the aluminide/steel clad pipe can be successfully fabricated by the proposed
reactive centrifugal casting method. |
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