Superparamagnetic Silicon Carbonitride Ceramic Fibers Through In Situ Generation of Iron Silicide Nanoparticles During Pyrolysis of an Iron-Modified Polysilazane.
Superparamagnetic Silicon Carbonitride Ceramic Fibers Through In Situ Generation of Iron Silicide Nanoparticles During Pyrolysis of an Iron-Modified Polysilazane.
复制标题
DOI：
10.1021/acsami.0c20885
复制
发表时间：
2021-02
影响因子：
9.5
通讯作者：
Antoine Viard;Hannah Kurz;Abhijeet Lale;L. Heymann;Birgit Weber;S. Bernard;M. Knauer;G. Motz
中科院分区：
文献类型：
--
作者：
Antoine Viard;Hannah Kurz;Abhijeet Lale;L. Heymann;Birgit Weber;S. Bernard;M. Knauer;G. Motz
陶瓷纤维是陶瓷基复合材料的高科技结构关键部件，陶瓷基复合材料是一类非常有前途的下一代涡轮材料，特别是非氧化物陶瓷纤维，通常由聚合物衍生陶瓷(PDC)工艺制备，具有增强的力学和热结构性能，可以承受施加在陶瓷基复合材料上的恶劣条件(温度和大气)。然而，回收纤维增强聚合物和CMC等复合材料仍然是一个巨大的挑战。在这里，我们首次提出了超顺磁性含铁陶瓷纤维的加工，由于其磁性，可以从复合材料的基质材料中分离出来。新型功能陶瓷纤维的合成策略是基于聚硅氮烷与铁络合物的量身定制反应，从而产生合适的、可熔化的聚合物。在熔融纺丝和固化后，由于原位生成的平均尺寸为7.5 nm的硅化铁纳米颗粒均匀分散在无定形的SiCNO基质中，随后的热解导致超顺磁性陶瓷纤维的饱和磁化强度为1.54emug-1。此外，陶瓷纤维还具有1.24 Gpa的抗拉强度和良好的抗氧化性。开发的多功能反应策略还允许加入其他元素，以实现多功能复合材料加工的进一步功能。
Ceramic fibers are high-tech structural key components of ceramic matrix composites (CMCs), which are a very promising class of materials for applications in next-generation turbines, especially nonoxide ceramic fibers, usually produced by the polymer-derived ceramics (PDC) route, which possess the enhanced mechanical and thermostructural properties necessary to withstand the harsh conditions (temperature and atmosphere) imposed on CMCs. However, recycling composite materials, such as fiber-reinforced polymers and CMCs, is still a big challenge. Here, we present for the first time the processing of superparamagnetic iron-containing ceramic fibers, which, due to their magnetic properties, can be separated from the matrix material of a composite. The synthesis strategy of the novel functional ceramic fibers is based on a tailored reaction of polyorganosilazane with an iron complex, resulting in a suitable, meltable polymer. After melt-spinning and curing, subsequent pyrolysis leads to superparamagnetic ceramic fibers with a saturation magnetization of 1.54 emu g-1 because of in situ-formed iron silicide nanoparticles of an average size of 7.5 nm, homogeneously dispersed in an amorphous SiCNO matrix. Moreover, the ceramic fibers exhibit a tensile strength of 1.24 GPa and appropriate oxidation resistance. The developed versatile reaction strategy allows also for the incorporation of other elements to implement further functionalities for processing of multifunctional composites.