Aluminium Oxide

Recent innovations in materials technology upsurge the use of Al2O3 and SiC based composites in aerospace, automotive, defence, transportation, and sporting industries. The reinforcements like Al, Ni, Cr, Gr, TiB2, ZrB2, MgO, HfB2, CNTs, B4C, Y2O3, GFRP and metal alloys are improving the elevated temperature thermal stability, corrosion resistance, wear resistance, fracture toughness, tensile strength, solar absorbance, fracture strength, flexural strength and crack healing ability respectively. The manufacturing methods like hot isostatic pressing, hot pressing, spark plasma sintering, electro stir forging process the Al2O3-SiC based material with a temperature range of 1400 °C–2000 °C and a pressure range of 2–100 Mpa to make the material suitable for ultra-high temperature applications. Reinforcements, the shape of the reinforcements, processing methods, processing routes, heat treatment methods, and surface finishing techniques are the prime factors that influence the strength, ...

Ex situ atomic force microscopy and x-ray photoelectron spectroscopy are employed to characterise the adsorp-tion of calcium phosphate from an aqueous solution of CaCl 2 .H 2 O and KH 2 PO 4 onto rutile-TiO 2 (110) and α-Al 2 O 3 (0001). Prior to immersion, the substrates underwent wet chemical preparation to produce well-defined surfaces. Calcium phosphate adsorption is observed on both rutile-TiO 2 (110) and α-Al 2 O 3 (0001), with atomic force microscopy images indicating island-type growth. In contrast to other studies on less well-defined TiO 2 and Al 2 O 3 substrates, the induction period for calcium phosphate nucleation appears to be comparable on these two surfaces.