Structural Features and Tribological Properties of Detonation Gun Sprayed Ti–Si–C Coating

B. Rakhadilov, D. Buitkenov, Zhuldyz Sagdoldina, B. Seitov, S. Kurbanbekov, Meruyert Adilkanova
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引用次数: 10

Abstract

The paper considers the research results of structural-phase state and tribological characteristics of detonation coatings based on Ti–Si–C, obtained at different filling volumes of the explosive gas mixture barrel of a detonation gun. The results analysis indicates that the phase composition and properties of detonation coatings strongly depend on the technological parameters of spraying. With an increase of the explosive mixture in the filling volume of the detonation barrel up to 70% of the coatings consist mainly of the TiC phase, because high temperature leads to a strong decomposition of Ti3SiC2 powders. Thus, the XRD results confirm that at 70% of the explosive gas mixture’s filling volume, partial decomposition and disintegration of the powders occurs after detonation spraying. We established that detonation coatings based on titanium carbosilicide obtained at the explosive gas mixture’s filling volume at 60% are characterized by high wear resistance and adhesive strength. Thermal annealing was performed after spraying in the temperature range of 700–900 °C for 1 h to reduce microstructural defects and improve the Ti–Si–C coating characteristics. As a result of the heat treatment in the Ti–Si–C system at 800 °C, we observed that an increase in the volume fraction of the Ti3SiC2 and TiO2 phases led to a 2-fold increase in microhardness. This means that the after-heat-treatment can provide a sufficient reaction time for the incomplete reaction of the Ti–Si–C (TSC) coating during the detonation gun spraying. Thus, annealing can provide an equal distribution of elements in the coatings.
爆轰枪喷涂Ti-Si-C涂层的结构特征及摩擦学性能
本文综合考虑了在爆轰枪混合炸药管不同填充体积下获得的基于Ti-Si-C的爆轰涂层的结构相态和摩擦学特性的研究结果。分析结果表明,爆轰涂层的相组成和性能与喷涂工艺参数有很大关系。随着爆轰管填充体积中炸药混合物的增加,高达70%的涂层主要由TiC相组成,因为高温会导致Ti3SiC2粉末的强烈分解。由此可见,XRD结果证实,在爆炸性气体混合物填充体积达到70%时,爆轰喷涂后粉末发生部分分解崩解。结果表明,在爆炸气体填充量为60%时制备的碳化钛爆轰涂料具有较高的耐磨性和粘接强度。喷涂后在700 ~ 900℃温度范围内热处理1h,以减少微观组织缺陷,改善Ti-Si-C涂层性能。在800°C的Ti-Si-C体系中进行热处理,我们观察到Ti3SiC2和TiO2相体积分数的增加导致显微硬度提高了2倍。这意味着后热处理可以为Ti-Si-C (TSC)涂层在爆轰枪喷涂过程中的不完全反应提供足够的反应时间。因此,退火可以在涂层中提供均匀的元素分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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