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Alumina-Based Nanocomposites Fabricated by a Novel Soaking Method

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Abstract:

Nickel dispersed alumina matrix nanocomposites were fabricated using a novel soaking method. Secondary particles were introduced into the nano-pores of a porous matrix grains by a soaking method, such that γ-alumina powder was soaked in nickel nitrate solution under vacuum. During pre-calcination, nickel oxide particles were created inside of the nano-pores of γ-alumina. The alumina powders were then reduced under hydrogen atmosphere to obtain nano-sized metallic nickel embedded in γ-alumina grains. The alumina-nickel composite powders were sintered by pulse electric current sintering (PECS) technique with α-alumina seeds. The maximum strength of the alumina-nickel nanocomposites was 984 MPa after sintering at 1,450 °C with α-alumina seeds, where the specimen size was 2210 mm3. The maximum fracture toughness was 5.5 MPa·m1/2 after sintering at 1,350 °C with seeds measured by the single edge V-notched beam (SEVNB) method.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

607-610

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.607

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Online since:

August 2006

Authors:

Uraiwan Leela-adisorn, Takuya Matsunaga, Seong Min Choi, Sawao Honda, Hideo Awaji

Keywords:

Al2O3/Ni Nanocomposites, Intra-Type Nanocomposites, Pulse Electric Current Sintering, Single Edge V-Notched Beam, Soaking Method

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1557/proc-581-303

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