Application of Nitrogen-Doped Nanocrystalline Diamond Film on Partially Stabilized Zirconia for Pulverization Disk
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Application of Nitrogen-Doped Nanocrystalline Diamond Film on Partially Stabilized Zirconia for Pulverization Disk Kazuki Shiokawa1, Takanori Mori1, Atsushi Naka1, Takehiko Matsumura2, Tetsuya Suzuki1 1 Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama-shi, Kanagawa-ken, 2238522, Japan 2 Nanomizer Inc., 1-19-4 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa-ken, 2100821, Japan ABSTRACT We report here partially stabilized zirconia (PSZ) matrix deposited with nanocrystalline diamond (NCD) films on its surface as an alternative material for pulverization disk with a potential of substituting high cost synthetic single crystal diamond. The deposition of NCD films on PSZ improved the characterization of the desorption-oxygen from PSZ matrix and enhanced the poor adhesion strength between NCD film and PSZ when N2 was used as doping gas. The results for X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed that with increasing N2 flow rate, nitrogen and desorption-oxygen were incorporated into film. The adhesion test and the pulverization test showed that enhancement in the adhesion strength as well as in the pulverization performance with increasing nitrogen and oxygen concentration in the NCD films. The results proposed to substitute a synthetic single crystal diamond with PSZ by coating nitrogen-doped NCD film. INTRODUCTION The diameters of water particles and their homogeneity in the emulsified fuel contribute in improving its stability as well as the combustion efficiency [1]. To obtain the water particles appropriate for using in emulsified fuel, water is pulverized. Water penetrates through small holes of a pulverization disk generating a high pressure over 200 MP and cavitation wear [1-3]. To achieve sufficient hardness and toughness required for pulverizing process, the pulverization disks are generally made of synthetic single crystal diamonds synthesized by the high pressure and high temperature (HPHT) method. Consequently, it is high cost as well [3]. Therefore, in order to have wider application of this pulverization method, it is necessary to search for a low cost alternative material substituting the high cost synthetic single crystal diamond. In our recent research, we first used partially stabilized zirconia (PSZ) as the disk material. However, the disk was initially damaged by the bombardment of particles, and finally etched much faster than the single crystal diamond disk. Due to the lower hardness, the surface of the PSZ disk showed damages from the cavitation wear. To protect the surface of the PSZ disk from the damage by the cavitation wear, we deposited nanocrystalline diamond (NCD) film on the PSZ disk. However, the NCD film on PSZ is difficult to use as mechanical tools because of the inadequate adhesion strength between NCD film and PSZ [4], and it is further impeded by the characteristic of zirconia; a high mobility of oxygen in PSZ matrix at high temperature, oxygen leave from PSZ matrix, and then it forms volatile carbon oxide, whi
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