Thermochemical modelling of the phase stability of coatings deposited from the gas phase

气相沉积涂层相稳定性的热化学建模

• 批准号: 5444265
• 负责人: Professor Jochen M. Schneider, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Werkstoffchemie (MCh)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5444265?language=en
• 关键词: Thermochemical; modelling; phase; stability; coatings

(Ti1-xAlx)N coatings are widely used for e.g. cutting toolapplications on account of their wear resistance at elevatedtemperatures. In the system (Ti1-xAlx)N, the transformationfrom the metastable cubic phase, with excellent tribologicalproperties, to the metastable hexagonal phase, with inferiorcoating properties, occurs in a range of 0,4 x 0,91, asreported by different authors. The reasons for the ratherextensive variation in the critical aluminium concentration atwhich the hexagonal phase appears are not evident.The aim of the proposed project is to contribute towardsunderstanding the reasons for this rather exensive variation.We seek to expand an existing thermochemical model, based oncomparing the Gibbs energy of stoichiometric and defect freeindividual structures to include variations in stoichiometry aswell as the presence of grain boundaries.Hence, we suggest to systematically, investigate therelationship between film stoichiometry, grain size and thestructure formed (cubic and/or hexagonal). We anticipate thatthis model will contribute significantly to a better basicunderstanding of the reasons for the above discussed differentcritical aluminium concentrations reported. In addition, such amodel will enable prediction of the coating constitution. Thiswould represent significant progress significant progress forthe production of coatings from the gas phase as compared tothe usually applied trial and error methods.

（TI1-XALX）N涂层广泛用于例如切割工具贴伤因其在升高物质时的耐磨损性而进行。在系统（TI1-XALX）n中，从亚稳态的立方相转化，具有出色的摩擦学培训，到具有下层状特性的亚稳态六边形相位，发生在0,4 x 0,91的范围内，由不同的作者提出。关键铝浓度散发性变化的原因是六边形阶段的出现并不明显。拟议项目的目的是有助于理解这种相当外在变化的原因。我们试图扩大现有的热化学模型，以围绕着人性化的形式构成的形式，以置于形式的范围内，以使人形象的变化构成，以置于定位的范围内，以置于定位的范围内，以置于定型的范围内。边界。因此，我们建议系统地研究形成的膜化学计量，晶粒尺寸和形成的薄膜化学计量（立方和/或六边形）之间的治疗方法。我们预计，该模型将对上述原因进行更好的基本理解，从而对上述原因进行了讨论，并报告了不同的临界铝浓度。此外，这种Amodel将实现涂层宪法的预测。这将代表从Gas阶段产生涂料的重大进展，因为比较了通常应用的试验和误差方法。