Abstract

In situ synthesis of carbon nanotubes (CNTs) on Ti powder decorated with Ni catalyst enabled us to obtain a high-quality CNTs/Ti composite powder via fluidized bed chemical vapor deposition (FBCVD) process. The composite powder was characterized by a combination of high structural integrity and uniform dispersion of CNTs, which is not obtained by traditional ball-milling route. These advantages enabled the retention of CNTs in the near-fully dense titanium matrix composite (TMC), together with the uniform dispersion of TiC particles. The CNTs and TiC particles coordinated with each other and contributed to a synergistic effect involving load transfer from the matrix to CNTs and dispersion strengthening of TiC particles. The nanotube–particle-reinforced TMC exhibited superior mechanical properties in comparison to single-phase-reinforced TMCs. The catalytic behavior of Ni, controllable synthesis of CNTs, the retention behavior of CNTs, and the formation mechanism of TiC particles during the sintering process are discussed in detail.

Graphic Abstract

中文翻译：

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碳纳米管在钛粉上原位生长，通过纳米管-颗粒双重形貌增强钛基复合材料

摘要

原位碳纳米管（CNT）对Ti粉末装饰有Ni催化剂合成使我们能够得到高品质的碳纳米管/ Ti的复合粉末通过流化床化学气相沉积（FBCVD）工艺。该复合粉末的特征是具有高结构完整性和碳纳米管均匀分散的组合，而这是传统球磨工艺无法获得的。这些优点使CNT可以保留在几乎完全致密的钛基复合材料（TMC）中，并且可以均匀分散TiC颗粒。CNT和TiC颗粒相互配合，并产生了协同作用，涉及从基体到CNT的负载转移以及TiC颗粒的分散增强。与单相增强的TMC相比，纳米管颗粒增强的TMC表现出优异的机械性能。Ni的催化行为，可控CNT的合成，该 详细讨论了碳纳米管的保持行为，以及烧结过程中TiC颗粒的形成机理。

图形摘要