Yanyan Deng , Luke Ma , Xueliang Pei , Qing Huang , Zhengren Huang
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引用次数: 0
摘要
目前正在开发增材制造技术,用于制造具有设计形状和微观结构的碳化硅陶瓷部件。本研究采用直接墨水写入(DIW)技术打印碳化硅陶瓷部件。为避免加入挥发性有机溶剂或水,使用了 SiC 陶瓷前驱体液态聚碳硅烷(LPCS)作为 SiC 粉末的粘合剂和流变调节添加剂。LPCS 的含量与 SiC 粉末的含量和直径进行了优化,以改善浆料的流动性、提高陶瓷产量并减少热解过程中的收缩。根据流变分析和热解收缩率的结果,由 40 nm SiC 粉和 5 μm SiC 粉以 1:6 的比例组成的 78 wt% SiC 粉是合适的。为使浆料在低温下快速凝固,加入了一种可引发 LPCS 上烯丙基交联的自由基引发剂。根据流变学、DSC 和 FT-IR 的结果,快速固化 DIW 浆料的首选平台温度为 150 ℃。随着浆料在加热平台上逐层累积,成功制备出了固化的绿色坯体。热解至 1200 ℃ 后,得到的 SiC 陶瓷部件仅有 4.43 % 的线性收缩,这与前驱体到陶瓷的转化有关。由于收缩率有限,因此没有发现明显的变形或裂缝。
Free radical-initiated direct ink writing of liquid polycarbosilane slurry and its conversion into SiC ceramic parts with low shrinkage
Additive manufacturing technology is being developed for manufacturing SiC ceramic parts with designed shape and microstructure. In this study, direct ink writing (DIW) was adopted to print SiC ceramic parts. To avoid incorporating volatile organic solvents or water, a SiC ceramic precursor liquid polycarbosilane (LPCS) was used as the binder of SiC powder and the rheological adjustment additive. The content of LPCS with the content and diameter of SiC powder were optimized to improve the fluidity of slurry, increase its ceramic yield and reduce its shrinkage during pyrolysis. According to the results of rheological analysis and shrinkage during pyrolysis, 78 wt% SiC powders composed of 40 nm SiC powder and 5 μm SiC powder in a ratio of 1:6 was appropriate. For achieving rapid solidification rate of the slurry at low temperature, a free‐radical initiator which can trigger the crosslinking of allyl group on LPCS was incorporated. According to the results of rheology, DSC and FT-IR, the preferred platform temperature for fast curing of DIW slurry was 150 °C. As the slurry accumulated layer by layer on heating platform, the cured green bodies were successfully prepared. After pyrolysis to 1200 °C, SiC ceramic parts were obtained with only 4.43 % linear shrinkage associated with the precursor-to-ceramic conversion. Because the shrinkage was limited, no obvious deformation or crack was found.
期刊介绍:
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.