Caccia Mario, Narciso Javier
Institute of Materials (IUMA), Alicante University, 03690 Alicante, Spain.
Materials Engineering Department, Purdue University, West Lafayette, IN 47907, USA.
Materials (Basel). 2019 Jul 30;12(15):2425. doi: 10.3390/ma12152425.
The manufacture of SiC-based composites is quite widespread, and currently different methods are employed to produce them. The most efficient method, taking into account the cost/performance ratio, is reactive melt infiltration. It consists in infiltrating liquid silicon into a porous preform that must contain carbon, so that SiC is produced during infiltration. In the present work, the synthesis of two SiC-based composite materials with very different applications and microstructures has been studied and optimized. In both cases, materials have been obtained with suitable properties for the selected applications. One of the materials studied is silicon carbide particles/silicon (SiC/Si) for protection systems such as armor jackets, and the other one is carbon fiber/silicon carbide (C/SiC) for use in braking systems. For the optimization, the dwell time and the atmosphere (Ar or primary vacuum) were used as variables. It has been found that in both preforms, the optimum conditions are 1 h dwell time and a vacuum atmosphere at 1450 °C. The effect of these parameters on microstructure and infiltration kinetics are discussed.
碳化硅基复合材料的制造相当普遍，目前采用不同的方法来生产它们。考虑到成本/性能比，最有效的方法是反应熔体浸渗。它包括将液态硅渗入必须含有碳的多孔预制体中，以便在浸渗过程中生成碳化硅。在本工作中，对两种具有非常不同应用和微观结构的碳化硅基复合材料的合成进行了研究和优化。在这两种情况下，都获得了具有适合所选应用性能的材料。所研究的一种材料是用于诸如防弹衣等防护系统的碳化硅颗粒/硅（SiC/Si），另一种是用于制动系统的碳纤维/碳化硅（C/SiC）。为了进行优化，将保温时间和气氛（氩气或初始真空）用作变量。已经发现，在两种预制体中，最佳条件都是保温时间1小时和在1450℃的真空气氛。讨论了这些参数对微观结构和浸渗动力学的影响。
