Processing and magnetic properties of metal-containing SiCN ceramic micro- and nano-composites
Processing and magnetic properties of metal-containing SiCN ceramic micro- and nano-composites
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DOI：
10.1007/s10853-007-2143-3
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发表时间：
2008-04
影响因子：
4.5
通讯作者：
R. Hauser;A. Francis;Ralf Theismann;R. Riedel
中科院分区：
文献类型：
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作者：
R. Hauser;A. Francis;Ralf Theismann;R. Riedel
由于其优异的耐高温和抗氧化性，非氧化物聚合物衍生的硅基陶瓷适用于高温和腐蚀性环境。含金属（Fe, Co）的预陶瓷化合物结合了有机聚合物的可加工性和金属成分的物理和化学特性。在本研究中，我们将介绍两种不同的方法将金属颗粒嵌入SiCN陶瓷基体中，该陶瓷基体来源于市售的聚硅氮烷Ceraset®。(1)。金属粉末（Fe, Co）与预交联聚硅氮烷混合研磨，并在1100℃下热解。(2)。金属羰基化合物Fe(CO)5和Co2(CO)8与纯聚有机硅氮烷发生化学反应，1100℃热解。这两种合成路线将讨论两个特定的例子，含铁和钴的样品，以及它们产生的不同的微观结构，相对于它们的磁性。采用x射线衍射（XRD）、扫描电子显微镜（SEM）耦合EDX、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）和磁强计对金属- sicn复合材料的物相和微观结构进行了研究。在1100℃氩气中退火后，与铁粉混合的交联聚硅氮烷具有高饱和磁化强度，约为~ 57 emu/g，与与钴混合的交联聚硅氮烷相比，具有良好的铁磁性。磁测量在65-300 K的温度范围内进行。
Owing to their excellent high temperature and oxidation resistance, non-oxide polymer-derived silicon-based ceramics are suitable for applications in hot and corrosive environments. The metal (Fe, Co)-containing pre-ceramic compounds combine the processability of organic polymers with the physical and chemical characteristics of the metallic component. In this study, we will introduce two different routes to embed metal particles in a SiCN ceramic matrix, derived from the commercially available polysilazane Ceraset®. (1). Mixing and milling of metal powders (Fe, Co) with pre-crosslinked polysilazane followed by pyrolysis at 1100 °C. (2). Chemical reaction between metal carbonyl compounds, namely Fe(CO)5and Co2(CO)8, with pure polyorganosilazane followed by pyrolysis at 1100 °C. Both synthetic routes will be discussed on two particular examples, iron- and cobalt-containing samples as well as their resulting different microstructures with respect to their magnetic properties. The phases and microstructures of the metal–SiCN composites were investigated in terms of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with EDX, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and magnetometer. Upon annealing in argon at 1100 °C, the crosslinked polysilazane blended with iron powder possesses a high saturation magnetization of about ∼57 emu/g and exhibits good ferromagnetic behaviour in comparison to the one blended with cobalt. The magnetic measurements were performed within the temperature range 65–300 K.