The optimal process parameters of ultrasonic-assisted processing were studied to further improve the molding quality and mechanical properties Ni60/WC-TiO2+La2O3 composite coating. A single-factor experiment was used explore influences ultrasonic vibration frequencies on microstructure, elemental composition, phase hardness, wear resistance coating using scanning electron microscopy (SEM), an X...

This paper presents a simple concept and design for a travel aid for the visually impaired. The proposed device uses ultrasonic signal in sensing and detecting an object (obstacles). The aid can inform the user about the distance of the detected obstacles by means of tactile vibrations. A prototype device called the intelligent walking stick (INSTICK) was developed under this concept. The INSTI...

Chip-on-film (COF) technology has been developed for liquid crystal displays (LCD) due to its high yield capability in fine pitch products. In this study, a new COF thermosonic (TS) bonding process using anisotropic conductive adhesive and ultrasonic vibrations will be introduced. Si chips with 16 cylindrical Cu bumps (¤100μm) and polyimide (PI) film substrate with a thickness of 70 μm were pre...

This paper addresses the sensitivity of ultrasonic welding process for joining dissimilar composites to variations in either force or amplitude vibrations. For that, carbon fibre (CF)/epoxy specimens were welded CF/polyetheretherketone (PEEK) specimens, through a polyetheretherimide (PEI) coupling layer co-cured with CF/epoxy material. It was found that reducing vibrations caused an increase he...

Vibrothermography, is an established NDT method praised for its fullfield and defect-selective imaging. Especially for cracks and similar damage, defect signals are produced within seconds for a wide variety of materials. Usually high power sonotrodes that are applied with kN pressure are employed in order to maximize ultrasonic excitation of the specimens. An increase in excitation power is us...

The paper deals with design, modelling, and testing of an ultrasonic (US) chain torsional vibrations that includes a tool at its end could be used for different industrial applications such conventional nonconventional machining revolution, helicoidal, curved surfaces or various types materials. US horn helicoidal channel whose profile was studied aiming growing the amplification amplitude tool...