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首页> 外文会议>Society of Vacuum Coaters Annual Technical Conference; 20050423-28; Denver,CO(US) >Science and Application of Duplex Coatings
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Science and Application of Duplex Coatings

机译：双面涂料的科学与应用

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A recently developed duplex process combines a plasma nitriding treatment with subsequent hard ceramic coating deposition. The upper part of the steel is hardened by nitriding. The hardened zone supports the hard ceramic coating and prevents failure. The combination of nitrided zone and hard coating is referred to as duplex coating. In our duplex process, both nitriding and coating deposition are performed in an industrial physical vapor deposition (PVD) apparatus. The process was applied with a variety of process conditions on various steels. The surface of the steels remained relatively smooth during nitriding, and in a relatively short nitriding time, considerable hardening depth was obtained: 20-30 μm in 1 h. CrN coatings with a very high hardness of 30 GPa were deposited on the nitrided steels. The scratch hardness of the duplex coated steels increased with increasing nitriding time from 4 GPa (coating on untreated substrate) to 10 GPa (nitriding time 8 h). Scratch test investigations revealed the separate contributions of hard coating and nitrided zone to the overall mechanical performance of duplex coatings. The fracture properties of CrN coatings of identical hardness depend on the microstructure. Nanocrystalline coatings were considerable more brittle than coatings with a columnar microstructure. The duplex process was scaled up to industrial loading conditions. By adjusting the plasma parameters during nitriding, a set of nitriding conditions were obtained for which a set of steels (very different in composition) can be nitrided. By adjusting the plasma parameters, the formation of iron nitride at the surface of the nitrided steel was prevented. Thereby good adhesion between the nitrided zone and the PVD coating was obtained: adhesive failure was never observed. Depending on the steel type, the hardness increased from about 700 to 1000-1200 Vickers due to nitriding. Consequently, different steel types can be successfully used as substrate in a single run, which is desirable from an industrial point of view.
机译：最近开发的双工工艺将等离子体氮化处理与随后的硬质陶瓷涂层沉积相结合。钢的上部通过氮化硬化。硬化区支撑着坚硬的陶瓷涂层并防止失效。渗氮区和硬涂层的组合称为双涂层。在我们的双工工艺中，氮化和涂层沉积都是在工业物理气相沉积（PVD）设备中进行的。该工艺在各种工艺条件下应用于各种钢材。在渗氮过程中，钢的表面保持相对光滑，并且在相对短的渗氮时间内，获得了可观的硬化深度：1小时内达到20-30μm。在氮化钢上沉积具有30 GPa的极高硬度的CrN涂层。随着渗氮时间从4 GPa（未处理的基材上的涂层）增加到10 GPa（氮化时间8 h），双相涂层钢的耐刮擦硬度随氮化时间的增加而增加。划痕试验研究表明，硬涂层和渗氮区对双相涂层整体机械性能的独立贡献。硬度相同的CrN涂层的断裂性能取决于显微组织。纳米晶体涂层比具有柱状微结构的涂层脆得多。双工工艺扩大到工业负载条件。通过在渗氮过程中调节等离子体参数，可获得一套渗氮条件，可以使一组钢（成分非常不同）被渗氮。通过调整等离子体参数，可以防止在氮化钢表面形成氮化铁。因此，在氮化区和PVD涂层之间获得了良好的粘合性：从未观察到粘合失败。取决于钢的类型，由于渗氮，硬度从大约700维氏增加到1000-1200维氏。因此，可以在一次运行中成功地将不同类型的钢用作基材，这从工业角度来看是理想的。

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