Carbon nanotubes (CNTs) were in situ synthesized on titanium diboride (TiB₂) substrates using different catalysts (Fe, Co, and Ni) via ethylene chemical vapor deposition (CVD). The effects of various catalysts on the quality and quantity of grown CNTs were investigated using X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman characterization techniques. Next, as‐received powders were sintered by spark plasma sintering to obtain compact bulk composites. The effects of the metallic catalysts as sintering aids on the microstructural and mechanical properties of TiB₂‐based composites were also studied. Results show that metal Ni not only plays a significant role in the catalyst to produce larger numbers of CNTs but also promotes the densification of TiB₂ ceramics in sintering and has been shown to provide good reinforcement. Maximum values of flexural strength (1093 ± 19 MPa) and toughness (13.9 ± 0.3 MPa ·m^1/2) were obtained using the Ni catalyst, which were significantly higher than the same values for Fe and Co catalysts.

中文翻译：

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催化剂对化学气相沉积法合成二硼化钛上碳纳米管的影响

使用不同的催化剂（Fe，Co和Ni），通过乙烯化学气相沉积（CVD）在二硼化钛（TiB ₂）衬底上原位合成碳纳米管（CNT ）。使用X射线衍射，扫描电子显微镜，透射电子显微镜和拉曼表征技术研究了各种催化剂对生长的CNT的质量和数量的影响。接下来，通过火花等离子烧结烧结所接收的粉末，以获得致密的块状复合材料。金属催化剂作为烧结助剂对TiB ₂显微组织和力学性能的影响还研究了基于复合材料的材料。结果表明，金属Ni不仅在催化剂中起着重要的作用，以生产大量的CNT，而且还促进了TiB ₂陶瓷在烧结过程中的致密化，并显示出良好的增强作用。使用Ni催化剂获得的弯曲强度（1093±19 MPa）和韧性（13.9±0.3 MPa·m ^1/2）的最大值，明显高于Fe和Co催化剂的相同值。