Mesoporous gamma alumina fibres of high surface area, stable up to 1000 oC, were synthesized by bioreplica technique using sisal fibres as templates. Alumina formation during pyrolysis and calcination of fibres infiltrated with aluminium chloride solution has been studied, paying special attention to the interaction between the precursor and sisal fibres, using several experimental techniques s...

Alumina is the most widely used oxide ceramic material. It exists in many metastable forms which lead upon severe thermal treatment towards the thermodynamically stable phase alpha. Sintering of alumina generally takes part in a minimum of two stages: i) phase transition(s) towards the stable phase alpha and ii) densification of this phase alpha. The former step(s), linked to transition phase(s...

γ-Alumina is a promising candidate for fabricating the gate of diamond metal oxide semiconductor field effect transistor based on oxygen termination due to its high bandgap 6.7 eV and static dielectric constant 9. Besides these properties, having sufficient barrier holes mandatory avoid carriers leakage through gate. However, band offset diamond/alumina heterojunction can be affected by alumina...

The wear of ultra-high molecular weight polyethylene acetabular cups was studied with a new biaxial hip wear simulator using diluted calf serum as a lubricant. The cups had been packed and gamma-irradiated in argon. The cups were articulated against two established types of femoral head, alumina and CoCr, and one experimental type, CoCr coated with diamond-like carbon (DLC). The diameter of the...