Improvement of preferred orientation of NiAl/CrMn underlayers deposited on prebaked tape substrates
It was observed that the coercivity of CoCrPt films deposited on a polyimide tape was much lower than the coercivity deposited on a rigid glass substrate under identical conditions. X-ray diffraction showed that the desirable (112) and (110) texture of the NiAl/CrMn underlayers on the tape substrate was severely degraded during the deposition process. This resulted in the destruction of (10.0) growth texture of CoCrPt films and a significant reduction of magnetic coercivity. However, degassing of the tape substrate under vacuum before deposition significantly enhanced the magnetic properties. The coercivity of the film reached 170 kA/m which is near that achieved on a glass substrate. Auger analysis also revealed that oxygen was present in the NiAl/CrMn underlayers deposited without degassing the tape substrate.
Influence of seedlayer on film microstructure of Co-Cr-Pt longitudinal recording media fabricated on plastic substrates
Influences of seedlayer on surface and cross-sectional film structures are investigated for the magnetic recording media fabricated on a plastic disk substrate. An irregular film growth is observed when a recording medium consisting of C/Co-Cr-Pt/Cr-Ti multilayer is deposited directly on an amorphous polyolefin substrate. Zr or Ti seedlayer with HCP crystal structure is found to be useful in improving the film microstructure and is comparable to that formed on a glass substrate. The recording media with Zr or Ti seedlayer have desirable microstructure and surface flatness which are necessary for high density magnetic recording applications.
Finite Difference Modeling on the Temperature Field of Substrate in Friction Surfacing
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. As a kind of thermal processing technology, the temperature profile and changes of the substrate in friction surfacing are important factors to get coatings of high quality. In this paper, the temperature field of the substrate during the process is simulated by finite difference method. The results are consistent with experiments, reappearing the temperature change of the substrate during friction surfacing, allowing further study on figuration and quality of coatings.