Preparation and Corrosion Resistance in KOH Solution of Porous Ni3Al Intermetallics

Chin J Mater Res

2011, Vol. 25

Issue (2): 118-123 DOI:

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Preparation and Corrosion Resistance in KOH Solution of Porous Ni3Al Intermetallics

WU Liang, Dong Hongxing, HE Yuehui

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083

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WU Liang Dong Hongxing HE Yuehui. Preparation and Corrosion Resistance in KOH Solution of Porous Ni3Al Intermetallics. Chin J Mater Res, 2011, 25(2): 118-123.

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Abstract Porous Ni3Al alloys were fabricated by cold pressing and pressureless sintering of Ni/Al elemental powder mixtures. The swelling behavior, pore structure parameters and microstructure of porous Ni3Al during synthesis procedure have been systematically investigated. The results show that swelling effect take place after sintering. The maximum pore size and open porosity increase with increasing of temperature, but when temperature exceeds 750^oC the swelling begins to suppress and the maximum pore size begins to decrease. The prime reason of the pore formation can be attributed to the Kirkendall effect in the process of reactive synthesis. The corrosion potential of porous Ni3Al in KOH solution is more positive than the other two porous compacts , and its weight is stable.

Key words: metallic materials Ni3Al intermetallics porous materials Kirkendall effect corrosion resistance in KOH solution

Received: 15 April 2010

ZTFLH:

TG172

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Supported by the National Science Foundation for Distinguished Young Scholars of China No.50285102, National Nature Science Foundation of China Nos. 20636020 & 50721003 and Key Basic Research and Development Program of China No. 2009CB623406.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2011/V25/I2/118

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