Additive manufacturing of functionally gradient refractory coatings using substrate dilution and in-situ carbide formation
Additive manufacturing of functionally gradient refractory coatings using substrate dilution and in-situ carbide formation
复制标题
DOI：
10.1016/j.msea.2023.145952
复制
发表时间：
2023-11
期刊：
影响因子：
--
通讯作者：
Poulomi Mukherjee;Ashlee Gabourel;S. Firdosy;Douglas C. Hofmann;Atieh Moridi
中科院分区：
文献类型：
--
作者：
Poulomi Mukherjee;Ashlee Gabourel;S. Firdosy;Douglas C. Hofmann;Atieh Moridi
在极端环境中实现操作仍然是航天、国防和能源部门的首要任务，推动了对超高温材料的需求。在这些领域中使用的传统材料具有有限的操作温度，因此新的替代品受到关注。难熔金属和碳化物具有优异的高温性能，然而，它们的高熔点和在凝固过程中对开裂的敏感性使它们具有加工挑战性，特别是通过增材制造（AM）技术。在这项工作中，定向能量沉积（DED）被用来创建一个功能梯度耐火涂层（W-WC-Nb系统的钛基板上）通过整合钛到耐火基体通过基板稀释。通过开发一种新的W基合金，然后从基底沿着构建方向添加钛，在更靠近基底的层内形成无裂纹的微观结构。此外，还探索了一种原位碳化物形成策略，产生了碳化钛和碳化铌相，可以改善高温和腐蚀性能，而无需克服与这些高熔点碳化物相关的加工困难。这些策略允许开发具有定制特性和改进的耐火材料系统的可加工性的新材料系统。
Enabling operations in extreme environments remains a top priority for the space, defense, and energy sectors, driving the demand for ultra-high-temperature materials. Traditional materials employed in these sectors have limited operating temperatures and thus novel alternatives are of interest. Refractory metals and carbides have excellent high-temperature properties, however, their high melting points and susceptibility to cracking during solidification make them challenging to process, especially through additive manufacturing (AM) technologies. In this work, Directed Energy Deposition (DED) was used to create a functionally graded refractory coating (W-WC-Nb system on a titanium substrate) by integrating titanium into the refractory matrix through substrate dilution. By developing a new W-based alloy then adding titanium from the substrate along the build direction, a crack-free microstructure was formed within layers closer to the substrate. Additionally, an in-situ carbide formation strategy was explored, creating titanium carbide and niobium carbide phases that could improve the high-temperature and corrosion properties without the need to overcome processing difficulties associated with these high-melting carbides. These strategies allow for the development of new material systems with tailored properties and improved processibility of refractory material systems.