The field of particulate reinforced titanium matrix composites (TMCs) has seen significant progress and breakthroughs over the last two decades. Among the particulate reinforced TMCs, Ti/TiB composites have been studied and well adopted in the industry. Despite many advantages, Ti/TiB composites, however, do not possess high wear resistance. Contrary to Ti/TiB composites, incorporation of Si₃N₄ into the Ti matrix can significantly increase the wear resistance. This study makes use of both reinforcements (Ti/TiB composite as core material and Ti/Si3N₄ as shell material) to produce a high strength, high wear-resistant hybrid composite system. The resultant composites were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. The results revealed complete decomposition of Si₃N₄ reinforcement and the formation of needle-shaped TiB whiskers, indicating that in situ reaction occurred during the vacuum sintering of the powder compacts. All the composite samples had a high sintered density. The hardness of the composites increased with an increase in the mass fraction of Si₃N_4. Tensile strength and tribological properties were determined and found to be dependent on the mass fraction of the reinforcements, respectively. The results show that by combining the two reinforcements, composite with a high-strength core and a high wear-resistant surface can be realized.

在过去的二十年中，颗粒增强钛基复合材料（TMC）领域取得了重大进展和突破。在颗粒增强的TMC中，Ti / TiB复合材料已被研究并在工业中得到广泛采用。尽管具有许多优点，但是Ti / TiB复合材料不具有高耐磨性。与Ti / TiB复合材料相反，将Si ₃ N ₄掺入Ti基体可以显着提高耐磨性。这项研究利用了两种增强材料（Ti / TiB复合材料作为芯材和Ti / Si3N ₄作为外壳材料）以生产高强度，高耐磨的混合复合系统。使用X射线衍射（XRD）和扫描电子显微镜（SEM）分析对所得复合材料进行表征。结果表明，Si ₃ N ₄增强剂完全分解，并形成针状TiB晶须，表明在粉末烧结体的真空烧结过程中发生了原位反应。所有复合材料样品均具有高烧结密度。Si ₃ N ₄的质量分数越高，复合材料的硬度越高_。测定拉伸强度和摩擦学性能，发现其分别取决于增强材料的质量分数。结果表明，通过结合两种增强材料，可以实现具有高强度芯和高耐磨表面的复合材料。