Papers by Keyword: Functional Applications

Abstract: The research in material science had led to the discovery of new materials; but the real challenge lies in finding suitable application for those materials to be used in various engineering fields. Finding application for a new material is very difficult. Cellular materials have the most promising applications and proved to be satisfactory for its applicability due to their high stiffness-to-weight ratio, better crash energy absorption, fire resistance, non-toxicity, low thermal conductivity, magnetic permeability and lower density. Along with drastic weight reduction and material savings in the case of cellular structures, there are other application-specific benefits like noise and energy absorption, mechanical damping and filtration effects. Various materials exist where weight reduction is the only parameter to be considered but if low weight combined with good energy absorption characteristics or heat resistance is required, then metal foams could be preferred. Possible applications are seen in areas like light weight construction, crash energy absorption, noise control, transport industry, building industry, heat exchangers, purifiers, decoration and arts, etc,. The use of foams can satisfy the demand for light-weighing parts of several branches of industry.

Abstract: The sintering behaviors and microwave dielectric properties of the (Ca0.3La0.4/3)(Li0.25Nd0.25)TiO3 (abbreviated CLLNT) ceramics doped by small amounts of ZnOB2O3- SiO2 glass and LiF were investigated in this paper. The combination adding of ZnO-B2O3- SiO2 glass and LiF improved the densifications of the CLLNT ceramics and the sintering temperature of the CLLNT ceramics were efficiently lowered from 1400°C to 1000°C. Especially, the 4.0wt% ZnO-B2O3-SiO2 glass and 1.0wt% LiF doped CLLNT ceramic sintered at 1000°C for 3h has optimum microwave dielectric properties of Kr=97, Q×f=1286GHz, and TCF=43 ppm/°C, which enable it a suitable candidate for LTCC applications.

Abstract: Nanostructured Lanthanum hexaboride (LaB6) powders were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectra (XPS). The average size of LaB6 nanoparticles is about 35nm, which are well crystallized with ball or ellipsoid with inconspicuous corners and covered by a 3-5nm thick amorphous layer containing oxygen and carbon. The absorption of LaB6 nanoparticles in visible and near infrared spectrum (NIR) was measured and compared with micron scale particles. The surface plasmon responance (SPR) of nanoparticles was very efficient at NIR blocking, which almost covered the whole NIR region. The influence of nanoparticles concentration on spectrum absorption was comparatively evident. Meanwhile, micron particles almost haven’t NIR blocking function.