Novel high power density cathode and anode materials for thin film battery are reported here. The
layered Li(NiMnCo)<sub>1/3</sub>O<sub>2</sub> film fabricated by sputtering shows a capacity as high as 190 mAhg<sup>-1</sup> in the
range of 3-4.9 V and a capacity retention of 90% after 100 cycles. Novel oxide anode is synthesized by
sputtering at room temperature, delivering a special capacity as high as 700 mAhg<sup>-1</sup> and a good
capacity retention. The thin film battery using these materials shows a good cyclability and high rate
The current state and future trend of laser bio-cladding technology are discussed. Laser bio-cladding
is used in implants including fabrication of metal scaffolds and bio-coating on the scaffolds. Scaffolds have
been fabricated from stainless steel, Co-based alloy or Ti alloy using laser cladding, and new laser-deposited Ti
alloys have been developed. Calcium phosphate bioceramic coatings have been deposited on scaffolds with
laser to improve the wear resistence and corrosion resistence of implants and to induce bone regeneration. The
types of biomaterial devices currently available in the market include replacement heart valve prosthesis, dental
implants, hip/knee implants, catheters, pacemakers, oxygenators and vascular grafts. Laser bio-cladding
process is attracting more and more attentions of people.
STO and subsequent YBCO thin films with different orientations have been grown on a single crystal MgO (100) substrate as well as a MgO on a 400nm amorphous SiO<SUB>2</SUB> covered Si (100) substrate using pulsed laser deposition (PLD) technique. Cross-sectional transmission electron microscopy (TEM) showed an epitaxial growth of highly c-axis oriented YBCO(001)/STO(100) on a single crystal MgO(100). TEM investigation on MgO/SiO<SUB>2</SUB> and MgO indicating interfacial reaction between SiO<SUB>2</SUB> and MgO. Chemical reaction may be possible at the interface when films are hold at high temperature based on the calculation of Gibbs free energy. Auger electron spectroscopy (AES) showed that an uphill diffusion of Ba from YBCO occurred during deposition and post thermal treatment processes.
This paper studies recent advances in rapid tooling (RT) of high performance components via selective laser melting (SLM). The present study of SLM focuses on the development of materials used in injection molding. In the process, the pre-alloyed iron-base alloy powder was used to fabricate parts using a 3KW CO<SUB>2</SUB> laser machine. Iron components with nearly full density have been directly produced under suitable laser parameters. The result of the SLM processed parts showed very fine dendrite microstructure. The surface hardness measured is 35-40 HRC, which is comparable to that of the AISI P20 steel (30-35 HRC). The advantages of this technique include elimination of a secondary infiltration process used by former selective laser sintering technology, reduced pre-processing time, and reduction in post- processing steps. The SLM process has a great potential in the field of RT.
The paper investigates the feasibility of laser cladding of copper-based materials. As an application aspect of rapid prototyping (RP), the process could be used to build electrodes for electrical discharge machining (EDM). Two types of material system-Cu/W (with and without nickel) and Cu/B<SUB>4</SUB>C (with and without nickel) in certain compositions were studied. The laser cladding was conducted in a 3000W CO<SUB>2</SUB> laser machine using various parameters. The microstructures of laser cladding samples were checked and analysed by SEM. The performance of electrodes made from these materials was examined in the terms of machining rate and wear rate.
Using pulsed laser deposition (PLD), (001)-textured Nb-doped Pb (Zr<SUB>0.52</SUB>Ti<SUB>0.48</SUB>)O<SUB>3</SUB> (PZT) films with highly restricted in-plane crystallographic alignments were successfully deposited on Si(001) wafers covered with amorphous SiO<SUB>2</SUB>. MgO and SrTiO<SUB>3</SUB> (STO) films were used as buffer and seed layers, respectively, for growth of YBA<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> (YBCO) and PZT layers. The YBCO layer can serve as a bottom electrode for activation of PZT films. Variations in the deposition conditions for the MgO films were found to play a key role in the subsequent deposition of the oriented PZT thin films. MgO films deposited at an O<SUB>2</SUB> partial pressure of 200 mtorr, have a strong (100) texture, leading to subsequent deposition of PZT films with both a strong (100) texture and highly restricted in-plane orientations. Although the MgO and STO films show very strong crystallographic textures, their in-plane orientations are random. The restricted in-plane orientations were only observed in the YBCO and PZT films.
TiAl intermetallic compound with composition of Ti-58at.%Al was synthesized from elemental Ti and Al powder mixture. X-ray measurement showed the presence of both face-centered- tetragonal TiAl phase and face-centered-cubic TiN phase. The formation of TiAl can be divided into three stages: (1) solid solution, (2) partial amorphization, and (3) formation of TiAl phase. The process of formation of TiAl phase via mechanical alloying took about 40 to approximately 50 hours.