Ultrasonic complex vibration welding of same and different metal specimens and structures of the welded area are studied using several complex vibration welding systems, scanning and transmission electron microscopes (SEM and TEM). Ultrasonic welding can weld various metal directly using vibration and static clamping pressure. The welding area is limited very narrow layer and can weld different...

The stirred wet milling of aluminum-doped TiO 2 was considered. At speeds 2500–6000 rpm, the pH i.e.p. shifted from 5.7 to ~8, while at 8000 rpm shift in smaller. Milling reduced performance attributed a change predominant mechanism. XPS revealed an approximate linear correlation between relative surface alumina content (at.%) and particle specific area, with shifting corresponding alumina. low...

in this work, a new, simple and fast method for the solid phase extraction-spectrophotometric determination of phosphate using cetyltrimethyl ammonium bromide immobilized on alumina-coated magnetite nanoparticles (ctab@acmnps) has been developed. the determination of phosphate is based on the molybdenum blue method which was monitored at λmax of 810 nm. mnps and acmnps characterized by sem, vsm...

PURPOSE The purpose of the present study was to evaluate the flexural strength of the joint between glass-infiltrated alumina frames and the experimental adjusting agent (MA modifier) that contains alumina and magnesia. METHODS A commercially available adjusting agent (Optimizer), a slurry of alumina powder (Alumina modifier), and a bulk specimen (joint-free alumina) were used as controls. Be...

Abstract Carbon nanoparticle coatings on laser-patterned stainless-steel surfaces present a solid lubrication system where the pattern’s recessions act as lubricant-retaining reservoirs. This study investigates influence of structural depth line patterns coated with multi-walled carbon nanotubes (CNTs) and onions (COs) their respective potential to reduce friction wear. Direct laser interferenc...

in the present investigation surface modification of silica nanoparticles by alumina was carried out by sol-gel process. fourier transform infrared (ftir) and x-ray fluorescence (xrf) confirmed the synthesis of silica and the surface modification as alumina is anchored to silica surface. field emission scanning electron microscopy (fesem) and transmission electron microscopy (tem) investigation...

Abstract Rationalizing the reactive element effect operative in alumina- and chromia-forming alloys upon oxidation under oxidizing hot gas atmospheres, referring to investigations on zirconium oxide-coated test samples for turbine alloys. This retrospective study uses results of cyclic furnace lifetime tests conducted at 1100 °C ZrO 2 -coated Ni-base with Y? or Y+ Hf-doped bond coats correlates...