Papers by Author: Shoji Miyake

Abstract: Characteristics of heating processing based on millimeter-wave or pulsed high current are discussed from the standpoint of the interaction between electromagnetic energy and solid materials. Capabilities of the electromagnetic processing are indicated by exemplifying several successful results such as millimeter-wave sintering of AlN, millimeter-wave post-annealing of aerosol-deposited PZT films and synthesis of single-phase nano-structured anatase by SPS (or pulsed high current heating). It is shown in these examples that well-characterized properties such as high thermal conductivity and preferential orientation are created by the inherent effect due to the electromagnetic field, which is called microwave or SPS effect in millimeter-wave or SPS processing.

Abstract: Super-hard nanocomposite films were deposited on Si(100) substrates with irradiation of a high-density (~2.0 mA/cm2) low-energy (~22 eV) ion flux by an inductively coupled plasma (ICP) assistance to magnetron sputtering process. Low-stress, super-hard nanocomposite Ti-Cu-N and Ti-Si-N films could be synthesized at low deposition temperatures below 300 oC. Prepared films exhibited a pronounced TiN(200) texture and the film hardness was significantly enhanced by the addition of Cu and Si, where a maximum value of 42 GPa at approximately 2 at% Cu addition and 48 GPa at approximately 5.8 at.% Si. Ti-Cu-N films were consisting of nanocolumns of TiN crystallites with dispersion of Cu crystallites around the columnar boundaries. While Ti-Si-N films were characterized as having a nanocolumns of TiN crystallites with amorphous Si3N4 inside the columnar boundaries. The residual compressive stresses of these films were lower than 1.5 GPa and no refinement of crystallite size by the addition of Cu and /or Si was observed, from which the hardness enhancement was attributed to a nanocomposite effect.