电弧离子镀制备 TiSiN 纳米复合涂层

目的在SiH4气氛下制备Si掺杂的TiSiN纳米复合涂层,为SiH4用于工业化TiSiN涂层生产提供依据。方法采用电弧离子镀技术,在SiH4气氛下,于单晶硅和硬质合金衬底上制备Si掺杂的TiSiN纳米复合涂层,研究SiH4流量对TiSiN涂层化学组分、微观结构、硬度和耐磨性能的影响。结果 SiH4流量对TiSiN纳米复合涂层的微观结构、硬度及摩擦系数的影响明显。随着SiH4流量的增加,TiSiN涂层由柱状晶生长的晶体结构逐渐转变为纳米晶镶嵌于非晶基体的复合结构。Si在涂层中以Si3N4非晶相存在,随着涂层中Si含量逐渐增加,TiN晶粒尺寸逐渐减小,Si3N4起到细化晶粒的作用。在42 m L/min的SiH4流量下,涂层硬度高达4100HV0.025。在对磨材料为硬质合金的条件下,TiSiN涂层摩擦系数小于0.6。结论 SiH4气氛下可以制备出Ti N纳米晶镶嵌于Si3N4非晶相结构的TiSiN纳米复合涂层,涂层的显微硬度较高。SiH4可以作为Si源用于TiSiN纳米复合涂层的工业化生产。

Deposition of TiSiN Nanocomposite Coatings by Arc Ion-plating

Objective To fabricate Si-doped TiSiN nanocomposite coatings in SiH4 ambient, and to provide approaches to fabricate TiSiN nanocomposite coatings using SiH4 in industrial production process. Methods TiSiN coatings were deposited on Si and cemented carbide substrates by cathodic arc ion plating in SiH4 ambient. The effects of SiH4 flow rate on the chemical composition, microstructure, mechanical and tribological properties of the TiSiN nanocomposite coatings were systemically investigated. Results The SiH4 flow rate had an obvious effect on the chemical composition, microstructure, mechanical and tribological properties of the TiSiN nanocomposite coating. With the increase of SiH4 flow rate, the structure of fabricated TiSiN coatings changed from columnar grain to composite structure of nanocrystalline embedded in amorphous phase matrix. The Si added in the coatings was in the amorphous Si3 N4 phase, with the Si content increased, the grain size of TiN decreased, which had a grain refining effect. The microhardness reached up to 4100HV0. 025 at the SiH4 flow rate of 42 mL / min (6. 3 at. % Si in the coating). Friction coefficients of TiSiN nanocomposite coatings increased with the increasing SiH4 flow rate when tested against carbide balls, and the friction coefficient was less than 0. 6. Conclusion The TiSiN nanocomposite coating of nanocrystalline embedded in amorphous matrix could be fabricated in SiH4 ambient. The microhardness was relatively high. SiH4 could be used for the deposition of TiSiN nanocomposite coatings in commercial process.