کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10626502 | 989686 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Soaking method for fabrication of alumina-based nanocomposites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Previously published research proposed strengthening and toughening mechanisms of nanocomposites based on dislocation activities even in brittle ceramics. We reported that an intra-type nano-structure could only have the potential to improve strength and fracture toughness due to dislocations formed around the dispersed particles. In this research, nickel dispersed alumina nanocompsoites were fabricated using a novel soaking method, based on the developed strengthening and toughening mechanisms. Commercially available γ-alumina powder with high porosity was used as the starting materials. Secondary, particles were introduced into the nano-pores of the porous γ-alumina powder using a soaking method, where the alumina powder was soaked in a nickel nitrate solution under vacuum. During pre-calcination, nickel oxide particles were generated inside the nano-pores. The alumina powders were then reduced under hydrogen atmosphere to obtain nano-sized metallic nickel inside the γ-alumina grains. The alumina-nickel composite powders were sintered by pulse electric current sintering (PECS) technique with α-alumina seeds. The mechanical properties of specimens were investigated, such as density, three-point strength, and fracture toughness. The maximum strength of the alumina-nickel nanocomposites was 984 MPa after being sintered at 1450 °C with α-alumina seeds, where the specimen size was 2 mm Ã 2 mm Ã 10 mm. The maximum fracture toughness was 5.5 MPa m1/2 after being sintered at 1350 °C with seeds measured by the single edge V-notched beam method.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 31, Issue 6, 2005, Pages 803-809
Journal: Ceramics International - Volume 31, Issue 6, 2005, Pages 803-809
نویسندگان
Uraiwan Leela-adisorn, Takuya Matsunaga, Yoshitomo Kobayashi, Seong-Min Choi, Hideo Awaji,