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The Cr and Ti based boron nitride thin films,including Cr–B–N and Ti-Cr–B–N coatings with various boron contents were deposited by a co-sputtering process using a pulsed DC reactive magnetron sputtering system.The structures and BN bonding nature of thin films were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR),respectively.