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| 1 | Si-based polymer-derived ceramics for energy conversion and storage显示文摘Since the 1960s,a new class of Si-based advanced ceramics called polymer-derived ceramics(PDCs)has been widely reported because of their unique capabilities to produce various ceramic materials(e.g.,ceramic fibers,ceramic matrix composites,foams,films,and coatings)and their versatile applications.Particularly,due to their promising structural and functional properties for energy conversion and storage,the applications of PDCs in these fields have attracted much attention in recent years.This review highlights the recent progress in the PDC field with the focus on energy conversion and storage applications.Firstly,a brief introduction of the Si-based polymer-derived ceramics in terms of synthesis,processing,and microstructure characterization is provided,followed by a summary of PDCs used in energy conversion systems(mainly in gas turbine engines),including fundamentals and material issues,ceramic matrix composites,ceramic fibers,thermal and environmental barrier coatings,as well as high-temperature sensors.Subsequently,applications of PDCs in the field of energy storage are reviewed with a strong focus on anode materials for lithium and sodium ion batteries.The possible applications of the PDCs in Li–S batteries,supercapacitors,and fuel cells are discussed as well.Finally,a summary of the reported applications and perspectives for future research with PDCs are presented. | Qingbo WEN Fangmu QU Zhaoju YU Magdalena GRACZYK-ZAJAC Xiang XIONG Ralf RIEDEL | 2022 | Journal of Advanced Ceramics2022，11，2： | 2 |
| 2 | Enhanced mechanical properties and thermal shock resistance of Si_2BC_3N ceramics with SiC coated MWCNTs显示文摘Bulk Si_2 BC_3 N ceramics were reinforced with SiC coated multi-walled carbon nanotubes(MWCNTs). The phase compositions, mechanical properties, and thermal shock resistance, as well as the oxidation resistance of the designed Si_2 BC_3 N ceramics were comparatively investigated. The results show that nano SiC coating can be formed on MWCNTs through pyrolyzing polysilazane, which improves the oxidation resistance of MWCNTs. A stronger chemical bonding is formed between the SiC coated MWCNTs and SiC particles, contributing to improved flexural strength(532.1 MPa) and fracture toughness(6.66 MPa m1/2). Besides, the 2 vol% SiC coated MWCNTs reinforced Si_2 BC_3 N ceramics maintains much higher residual strength(193.0 MPa) after thermal shock test at 1000 ℃.The enhanced properties should be attributed to:(1) the breaking of MWCNTs and the debonding between MWCNTs and SiC interfaces, which leads to more energy dissipation;(2) the rough surfaces of SiC coated MWCNTs increase the adhesion strength during the 'pull out' of MWCNTs. | Ning LIAO Dechang JIA Zhihua YANG Yu ZHOU | 2019 | Journal of Advanced Ceramics2019，8，1： | 2 |
| 3 | 高压烧结致密非晶SiBCN块体陶瓷的组织结构演化与力学性能显示文摘非晶SiBCN陶瓷是一类独特的结构材料,具有低比重、高比强度、优异的高温损伤容限等特殊结构和性能,因此在高温防热结构部件上极具应用潜力。通过合理的结构与化学成分协同设计,可探索陶瓷形貌/微观结构演化及断裂行为的基本特征,从而进一步提高其力学性能,以满足实际应用需求。因此,文章以石墨、六方氮化硼、立方硅和硼等元素粉末为原料,提出了采用机械合金化结合高压烧结技术(1 000°C/3~5 GPa/30 min)制备致密非晶Si2ByC2N(y=1.5~4)块体陶瓷的方法。通过XRD、SEM、TEM、TG等表征手段,研究了烧结压力诱导该系非晶陶瓷的组织结构演化、相变及热稳定性,并对其力学性能,特别是断裂行为进行了详细讨论。结果表明,提高烧结压力促使陶瓷基体由完全非晶态向晶态转变,部分块体陶瓷由大量非晶相、少量c-Si和/或t-BN(C)纳米晶相组成,显示出依赖于硼含量的物相组成。高压烧结有效地促进了陶瓷的烧结致密化,导致材料内自由体积的湮灭和'河流状'断裂形貌的产生。随着烧结压力的提高,陶瓷材料的体积密度、纳米硬度和杨氏模量单调增加。在相同烧结条件下,硼含量的增加削弱了非晶Si2ByC2N(y=1.5~4)块体陶瓷的力学性能和热稳定性。1 000°C/5 GPa/30 min烧结制备的致密非晶Si2B1.5C2N块体陶瓷的体积密度、纳米硬度和杨氏模量分别为2.69 g/cm3、33.6±2.2GPa和414.2±16.5 GPa。 | 李达鑫 杨治华 贾德昌 蔡德龙 段小明 何培刚 王胜金 周玉 田永君 | 2020 | 自然杂志2020，42，3： | 1 |
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