STTR Phase I: Actively Seeded Microwave Processing of Multifunctional Silicon Carbide

这个小型企业技术转移（STTR）第一阶段项目将采用一种新颖的方法来快速制造低成本和净形状的碳化硅组件，并具有专门定制的多功能特性。这些材料将通过微波诱导裂解活性种子，高纯度预陶瓷聚合物。加工参数的控制将允许直接控制材料的微/纳米结构、机械、电气和/或热特性，以及包括孔隙度和透气性在内的物理特性。多种碳化硅的聚合物前驱体已经被配制成含有硅的材料，当加热温度高于800℃时，它们会经历聚合物到陶瓷的转化，这使得生产高三维共价耐火材料成为可能，而传统的粉末加工工艺很难制造这些材料。为了缩短加工时间和提供更大的吞出率，人们正在研究非传统的加热系统，如微波加热。

This Small Business Technology Transfer (STTR) Phase I project will have a novel approach for the rapid fabrication of low-cost and net-shape, silicon carbide components with specifically tailored multifunctional properties. These materials will be produced by microwave-induced pyrolysis of an actively seeded, high-purity preceramic polymer. The control of processing parameters will allow for direct control over material micro/nano-structure, mechanical, electrical and/or thermal characteristics, and physical properties including porosity and gas permeability. A variety of polymeric precursors to silicon carbide have been formulated that contain silicon and undergo a polymer-to-ceramic conversion when heated at temperatures above 800C, which allows the production of highly three-dimensionally covalent refractory components that are difficult to fabricate via the traditional powder processing. In order to reduce processing time and provide a larger throughput rate, nonconventional heating systems, such as microwave heating, are being investigated.