H. Ghasemi, M. A. Faghihi Sani, Z. Riazi,
Volume 4, Issue 3 (Summer &Autumn 2007 2007)
Abstract
Abstract: The effect of phase development on peel strength of alumina-copper metalized joint has
been investigated. The alumina-copper joint was prepared in three stages. The alumina substrate
was, first, metalized at 1500°C in H2-furnace by a new formulation. In the second step, a nickel
layer was electroplated on the metalized layer with approximately 10µm thickness. Finally, copper
strips were bonded to metalized alumina with Ag-Cu (72-28) filler metal. The peel strength of the
joint was 9.5±0.5 Kg/cm which shows approximately 30% increase in comparison to previous
works. By study of fracture surface and crack propagation path, it has been concluded that this
increase is due to the formation of more spinel phase.
Faraz Hussain, Muhammad Umar Manzoor, Muhammad Kamran, Tahir Ahmad, Fahad Riaz, Sehrish Mukhtar, Hafiz Muhammad Rehan Tariq, Muhammad Ishtiaq,
Volume 21, Issue 3 (September 2024)
Abstract
Magnesium alloys are increasingly valued for biomedical applications due to their biocompatibility. This study investigates Mg-AZ31B alloy samples treated with quartz and alumina grits (<200 μm) at varied pressures, followed by anodization in an eco-friendly alkaline electrolyte. The results show that increased blasting pressure produces a rougher surface. Anodization time significantly affects the thickness of the anodic film, leading to a transition in surface morphology from fine to coarse structures with complete film coverage. Characterization by XRD reveals that the anodic film mainly comprises magnesium oxide and hydroxide phases. Open Circuit Potential (OCP) measurements demonstrate enhanced corrosion resistance post-anodization, particularly notable at 40 minutes on alumina-blasted samples. ANOVA confirms that both blasting pressure and anodization time significantly influence coating thickness and OCP, indicating the formation of a dense anodized layer.
