推 荐 人:干科

文献信息1 Montanaro L, Coppola B, Palmero P, et al. A review on aqueous gelcasting: A versatile and low-toxic technique to shape ceramics. Ceramics International, 2019, 45(7): 9653-9673.

推荐理由:本文综述了近年来凝胶注模成型工艺方向的研究进展,主要围绕替代具有毒性的有机单体丙烯酰胺发展的无毒或低毒凝胶体系,包括琼脂、明胶、卡拉胶等凝胶体系。这些体系大多为水基凝胶体系,并且单体添加量很少,无需排胶过程,可以制备简单或复杂形状的致密陶瓷,也可以制备多孔及复合陶瓷材料,制备的坯体可以满足先进陶瓷的生产需求。但是对浆料的流变行为、注模操作以及干燥和储存条件等环节需要进行严格的控制,这是使其迈向产业化应用的关键。

Abstract: This review aims to provide a comprehensive survey of recent low-toxic approaches used in the gelcasting process. In recent years, several natural gelling agents have been developed as possible alternatives to acrylamide systems, which were previously used extensively but are now rarely employed owing to their neurotoxicity. This work collects some successful case studies on aqueous gelcasting based on low-toxic or non-toxic gelformers that have been applied to produce both dense and porous ceramics. Major innovations in the development of nanocomposite materials, transparent ceramics and microstructurally graded materials are discussed as well.

下载地址:https://www.sciencedirect.com/science/article/pii/S0272884218334606?via%3Dihub

 

文献信息2 Qin Y, Liu J X, Li F, et al. A high entropy silicide by reactive spark plasma sintering, Journal of Advanced Ceramics, 2019, 8(1): 148-152.

推荐理由:高熵合金(High Entropy AlloysHEA)是指含有五种或五种以上金属元素的合金,每一种元素的原子含量在5% ~ 35%之间,也称为多组元合金。高熵陶瓷(High Entropy CeramicsHEC)是指由五种或五种以上金属元素和一种非金属元素组成的具有简单晶体结构的陶瓷材料。已有研究指出,高熵材料具有优异的力学性能、热物理性能、抗辐照性能和耐蚀性能等。本文首次报道了一种高熵硅化物的合成。以TiZrNbMoW五种金属单质和单质Si为原料,利用反应放电等离子体烧结技术,在1300ºC下保温15min,成功制备出了(Ti0.2Zr0.2Nb0.2Mo0.2W0.2)Si2高熵硅化物陶瓷,并对材料的物相组成、显微结构、元素分布、力学性能等进行了初步分析。硅化物陶瓷具有优良的高温抗氧化性能、导电性能和导热性能,通过高熵化有可能进一步调控硅化物陶瓷的性能,丰富高熵陶瓷的研究内容,对促进硅化物的发展和应用具有重要意义。

Abstract: A high-entropy silicide (HES), (Ti0.2Zr0.2Nb0.2Mo0.2W0.2)Si2 with close-packed hexagonal structure is successfully manufactured through reactive spark plasma sintering at 1300°C for 15 min. The elements in this HES are uniformly distributed in the specimen based on the energy dispersive spectrometer analysis except a small amount of zirconium that is combined with oxygen as impurity particles. The Young’s modulus, Poisson’s ratio, and Vickers hardness of the obtained (Ti0.2Zr0.2Nb0.2Mo0.2W0.2)Si2 are also measured.

下载地址:https://link.springer.com/content/pdf/10.1007%2Fs40145-019-0319-3.pdf

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