【作者】 冯文然； 周海； 杨英歌； 曾冬梅； 卢一民； 万汉城；

【Author】 FENG Wen-ran ZHOU Hai YANG Ying-ge ZENG Dong-mei LU Yi-min WAN Han-cheng (Department of Materials Science and Engineering,Beijing Institute of Petrochemical Technology, Beijing 102617,China)

【机构】 北京石油化工学院材料科学与工程系；

【摘要】 自行设计了一种气体隧道等离子喷枪。使用该喷枪,以钛粉和氮气为反应物,通过反应等离子喷涂(RPS)技术,制备了致密的TiN涂层。反应等离子喷涂技术适用于制备致密的金属或金属间化合物基复合涂层,并可在涂层中均匀分布细小的陶瓷相以提高涂层材料的强度。该TiN涂层具有厚度大(>500μm)的特点,且是由纳米晶粒所构成的。就这一点可以说,我们发展了一种新的纳米材料的制备技术。我们利用X-射线衍射技术、透射电镜以及高分辨透射电镜研究了纳米晶TiN涂层。结果表明,涂层化学组成较为理想,涂层是由直径50-70nm的TiN晶粒以及非晶态的TiN相所构成的。TiN纳米晶粒之间是约为7°的小角度晶界。更多还原

【Abstract】 A gas-tunnel plasma spraying gun was self-designed.The titanium powders and nitrogen gas were used as the reactants to produce dense TiN coating by means of the reactive plasma spraying(RPS) technique. RPS is a promising technique that enables the fabrication of dense composite coatings with a metallic or an intermetallic matrix and finely dispersed ceramic phases.The TiN coating is of great thickness(>500μm) and composed of nanocrystallities.In this respect,a new nano-materials fabrication technology was developed.The nanocrystalline TiN coating was examined using XRD,TEM and HRTEM.Results show that the coating is of well-stoichiometry,which is composed of TiN crystals of about 50-70nm in diameter,as well as the amorphous TiN phase.The nanocrystallities are separated by small-angle(about 7) grain boundaries.更多还原