Open porosity cellular SiC-based ceramics have a great potential for energy conversion, e.g. as solar receivers. In spite of their tolerance to damage, structural applications at high temperature remain limited due to high production costs or inappropriate properties. The objective of this work was to investigate an original route for the manufacturing of porous SiC ceramics based on 3D printing and chemical vapor infiltration/deposition (CVI/CVD). After binder jetting 3D-printing, the green α-SiC porous structures were reinforced by CVI/CVD of SiC using CH₃SiCl₃/H₂. The multiscale structure of the SiC porous specimens was carefully examined as well as the elemental and phase content at the microscale. The oxidation and thermal shock resistance of the porous SiC structures and model specimens were also studied, as well as the thermal and mechanical properties. The pure and dense CVI/CVD-SiC coating considerably improves the mechanical strength, oxidation resistance and thermal diffusivity of the material.

开放孔隙的多孔SiC基陶瓷具有很大的能量转换潜力，例如作为太阳能接收器。尽管它们具有耐损坏性，但由于高生产成本或不合适的性能，高温下的结构应用仍然受到限制。这项工作的目的是研究基于3D打印和化学气相渗透/沉积（CVI / CVD）的多孔SiC陶瓷制造的原始途径。粘合剂喷射3D打印后，使用CH ₃ SiCl ₃ / H ₂通过SiC的CVI / CVD增强绿色的α-SiC多孔结构。仔细检查了SiC多孔试样的多尺度结构以及微观尺度上的元素和相含量。还研究了多孔SiC结构和模型试样的抗氧化性和抗热震性，以及热力学性能。纯而致密的CVI / CVD-SiC涂层极大地提高了材料的机械强度，抗氧化性和热扩散性。