Abstract

The optimization of characteristics of pyrolytic chromium carbide coatings (PCCCs) for various fields of industry is discussed. The scope of PCCC application involves the protection of the surface of various details and units made from different materials against corrosion, sticking, high temperatures, and various types of wear. Such versatility of PCCCs is caused in particular by their structural features, which usually represent the superlattice of alternating relatively hard and soft layers, which differ in composition and, accordingly, functional characteristics, such as microhardness or Young modulus. Such a structure at particular periods and layer-thickness ratios corresponds to the maximum figure of merit of the problem of optimal control theory (OCT), which represents the inverse problem stated on the class of solutions of primal problem, which models specific interaction, e.g., abrasive wear. In this case, the primal problem, e.g., indentation description, is an ill-posed inverse problem of mathematical physics, and another optimal strategy is required to solve it. Thus, a hierarchy of optimization algorithms arises and, using it, one can achieve highest functional characteristics of PCCCs. If the primal problem of abrasive wear could not be formalized, a calculation–experimental method developed by the authors, which is also based on OCT, is suggested. The main emphasis is on improving the deposition technology of PCCCs for each specific application using the optimal control theory. In order to obtain a PCCC fulfilling these conditions, it is necessary to consider the physicochemical features of pyrolysis of precursors, as well as the effect of various additives and catalysts on the development of flow process.

中文翻译：

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热解碳化铬涂层性能的优化

摘要

讨论了各种工业领域的热解碳化铬涂层（PCCC）特性的优化。PCCC应用范围涉及保护由不同材料制成的各种零件和部件的表面，以防止腐蚀，粘连，高温和各种磨损。PCCC的这种多功能性尤其是由其结构特征引起的，这些结构特征通常代表交替交替的相对硬和软层的超晶格，它们的成分不同，因此，其功能特性也不同，例如显微硬度或杨氏模量。这样的结构在特定周期和层厚比下对应于最优控制理论（OCT）问题的最高品质因数，它代表在原始问题的解类上陈述的反问题，模拟特定的相互作用，例如磨料磨损。在这种情况下，原始问题（例如压痕描述）是数学物理学的不适定逆问题，因此需要另一种最佳策略来解决。因此，出现了优化算法的层次结构，使用它可以实现PCCC的最高功能特性。如果不能正式确定磨料磨损的主要问题，则建议使用由作者开发的计算实验方法，该方法也基于OCT。主要重点是使用最佳控制理论针对每种特定应用改进PCCC的沉积技术。为了获得满足这些条件的PCCC，有必要考虑前体热解的理化特性，