To improve the cutting performance and prolong service life of a carbide-coated tool in process ductile iron machining, an electromagnetic coupling treatment (EMCT) was carried out. The experiments show that force temperature are reduced after EMCT, roughness machined surface is reduced. It found EMCT with optimal parameters dislocation density, microscopic strain, microhardness bonding strengt...

A new rapid, very simple and one-step sol-gel strategy for the large-scale preparation of highly porous γ-Al₂O₃ is presented. The resulting mesoporous alumina materials feature high surface areas (400 m² g-1), large pore volumes (0.8 mL g-1) and the γ-Al₂O₃ phase is obtained at low temperature (500 °C). The main advantages and drawbacks of different preparations of mesoporous alumina materials ...

Thin alumina films have found applications in electronic circuits and cutting tools and have been recently explored as protective coatings against high temperature oxidation, but these studies have been relatively rare. In this study, amorphous alumina films 3.5 pm thick were produced by reactive sputtering on Co-30Cr-6Al-0.5Y coatings, using a pure aluminum target in Ar + 0 2 atmosphere. Isoth...

Abstract. High porosity materials, such as ceramic foams, can be used for several applications spanning from thermal insulators, biomedical implants, molten metal filters, and others. The general practice is to adjust the shape of those foams in a pre-sintering stage obtain complex shapes. This work aims investigate workability post-sintering condition an alternative way overcome premature prod...

The paper reviews progress for a program of research on alumina ceramics processing, with particular reference to diffraction results achieved using tube x-rays, neutrons and synchrotron radiation. Outcomes from three related studies are examined. l Calcination of alumina hydrates to o-alumina via intermediate aluminas, including some new results indicating the co-existence of cubic and tetrago...

Catalytic oxidation of low concentrations ethanol was investigated in dry and humid air streams at temperature (60 °C) over manganese oxide-based catalysts supported on a meso–macrostructured TiO2 using ozone as the oxidant. Ethanol selected representative model VOC present indoor air, its concentration fixed to 10 ppm. For that purpose, series Mn/TiO2 powder monolithic prepared, some doped wit...

An efficient and green protocol for the synthesis of αaminonitriles derivatives by one-pot reaction of different aldehydes with amines and trimethylsilyl cyanides has been developed using natural alumina, alumina sulfuric acid (ASA), nano-γ-alumina, nanoalumina sulfuric acid (nano-ASA) under microwave irradiation and solvent-free conditions. The advantages of methods are short reaction times, h...