Abstract An integration technology was employed to prepare TiC-TiB2 strengthening coating on aluminum alloys, with the combination of Self-propagating high-temperature synthesis (SHS) and Vacuum-expendable pattern casting (VEPC). During the VEPC process, the Ti-C-B4C-TP SHS reaction was ignited by molten Al alloy, resulting in the simultaneous obtainment of TiC-TiB2 SHS coating with the cast Al alloy. Specifically, Teflon (PTFE) as reaction promoter was introduced into the SHS system to guarantee the reaction to be ignited successfully. With 3.8 wt% PTFE addition, homogeneous and dense TiC-TiB2 coating microstructure was obtained. Compared to the matrix, the hardness of the surface coating increased from 80 HB to 284 HB. And, the weight loss decreased from 533 mg to 52 mg at load of 20 N, indicating the significant improvement of wear resistance. In addition, a comprehensive bonding strength of 160 MPa was achieved. The proposed method for preparing hard coating on Al alloys broadens their industry application, where higher hardness and better wear resistance are required.

中文翻译：

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原位TiC-TiB2复合涂层表面强化铝合金

摘要 采用自蔓延高温合成（SHS）和真空消耗模铸（VEPC）相结合的集成技术在铝合金上制备TiC-TiB2强化涂层。在 VEPC 过程中，熔融铝合金引发 Ti-C-B4C-TP SHS 反应，导致与铸造铝合金同时获得 TiC-TiB2 SHS 涂层。具体来说，将特氟龙（PTFE）作为反应促进剂引入到 SHS 系统中，以保证反应成功点燃。添加 3.8 wt% 的 PTFE 后，获得了均匀致密的 TiC-TiB2 涂层微观结构。与基体相比，表面涂层的硬度从80 HB增加到284 HB。并且，在 20 N 的负载下，重量损失从 533 mg 减少到 52 mg，表明耐磨性有了显着提高。此外，还实现了160 MPa的综合结合强度。所提出的在铝合金上制备硬涂层的方法拓宽了它们的工业应用，在这些领域需要更高的硬度和更好的耐磨性。