کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1652109 1007636 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fracture toughness of alumina/lanthanum titanate laminate composites with a weak interface
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Fracture toughness of alumina/lanthanum titanate laminate composites with a weak interface
چکیده انگلیسی

Layers of lanthanum titanate (La2Ti2O7) and α-alumina (α-Al2O3) were employed to form a layered composite in order to improve the fracture toughness of monolithic alumina. The composites were produced by two different processing methods. In the first, individually presintered pellets of α-Al2O3 and La2Ti2O7 were stacked together and hot-forged. In the second, tape cast molten salt La2Ti2O7 and dense α-Al2O3 were stacked together and hot-forged. The forged composite samples were investigated by optical microscopy, scanning electron microscopy (SEM), Vickers indentation and three-point bending. During the hot-forging process, an interphase, aluminum titanate (Al2TiO5) was found to form as a result of the reaction between α-Al2O3 and La2Ti2O7. The flexural strength and the fracture toughness of the resulting laminate composites were found to be 320 MPa and 7.1 MPa m1 / 2, respectively. Indentation experiments showed that the newly formed Al2TiO5 at the interface is sufficiently weak to promote crack deflection and hence increase the fracture energy and mechanical properties of the composite.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 61, Issue 2, January 2007, Pages 551–555
نویسندگان
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