Silicon carbide-silicon carbide ceramic matrix composites (SiC-SiC CMC’s) are being used in gas turbine engine hot sections due to their refractory nature and excellent toughness at high temperatures. A novel heat flux sensor was developed for SiC-SiC CMC based engine components, which can survive temperatures up to 550 °C. The heat flux sensor consists of platinum thin films that forms a thermocouple junction with the SiC-SiC CMC which utilizes the bulk thermoelectric properties of the SiC-SiC CMC for its operation. This novel Pt:SiC-SiC CMC heat flux sensor generates a thermoelectric voltage that is directly proportional to the temperature gradient along the through thickness direction of the CMC component onto which it was deposited and has a calibration factor of 0.0266 µV/(W/m²). Fabrication details, experimental results and implementation challenges are discussed.

碳化硅-碳化硅陶瓷基复合材料 (SiC-SiC CMC) 由于其耐火特性和高温下的优异韧性而被用于燃气涡轮发动机的高温段。为基于 SiC-SiC CMC 的发动机部件开发了一种新型热通量传感器，该传感器可承受高达 550 °C 的温度。热通量传感器由铂薄膜组成，它与 SiC-SiC CMC 形成热电偶结，利用 SiC-SiC CMC 的体热电特性进行操作。这种新型 Pt:SiC-SiC CMC 热通量传感器产生的热电电压与沿 CMC 组件厚度方向的温度梯度成正比，其校准因子为 0.0266 µV/(W/m ²）。讨论了制造细节、实验结果和实施挑战。