کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1659592 1517687 2009 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A microstructure and mechanical property investigation on thermally sprayed nanostructured ceramic coatings before and after a sintering treatment
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
A microstructure and mechanical property investigation on thermally sprayed nanostructured ceramic coatings before and after a sintering treatment
چکیده انگلیسی

Coatings have been deposited by air plasma spraying of alumina powders in the form of conventional particles (C), nanostructured agglomerates (N) and sintered–nanostructured agglomerates (S). Sintering alleviated the stresses introduced in the nanopowder by the manufacturing process (high energy ball milling). The coating porosity is a direct consequence of the powder melting degree, which is related to the feedstock porosity. The mechanical performance of the coatings is also closely associated with the powder melting degree. The N coatings present the highest surface roughness due to the lowest melting degree. The slightly higher hardness values of the N and S coatings, as compared to the C coatings, are attributed to the higher percentages of α-Al2O3 and the presence of nanostructure. The S coatings exhibit superior adhesion strength, relative fracture toughness and wear resistance, due to sintering consequences (intraparticle cohesion, strain relief, tough splat boundaries), random dispersion of coherent nanozones and stress dissipation at nanograin boundaries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 204, Issues 1–2, 25 September 2009, Pages 15–27
نویسندگان
, , ,