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首页> 外文会议>International Conference on Advanced Ceramics and Composites >DESIGN, FABRICATION, AND TESTING OF SILICON INFILTRATED CERAMIC PLATE-TYPE HEAT EXCHANGERS
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DESIGN, FABRICATION, AND TESTING OF SILICON INFILTRATED CERAMIC PLATE-TYPE HEAT EXCHANGERS

机译：硅渗透陶瓷板式热交换器的设计，制造和测试

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A novel concept for hydrogen production has been reported by the US Department of Energy, which combines the use of heat from a nuclear power plant (a Generation IV reactor) or a solar power tower for the production of hydrogen in a thermo-chemical reaction. Ceramic heat exchangers (HX) provide a promising technology for this concept. Novel plate-type HXs with high power densities are proposed, which are based on novel integrated flow-channel designs. The main purpose of this study is the investigation of net-shape fabrication to prototypical HX components based on these designs. To achieve net-shape plates, dry powder mixtures were molded by axial pressing. The joining to the prototypical 3D HX stack was accomplished by lamination followed by pyrolysis at temperatures of up to 1650 °C . Due to the use of carbon fibers the shrinkage could be controlled and reduced to about 5 %. Finally, accurate silicon melt infiltration by using the wick method into the porous C/C preforms led to dense C/SiSiC ceramics. Microstructural investigations and flexural strength measurements were performed to demonstrate the homogeneity of the ceramic and the quality of the joinings. The gas-tightness of the ceramic composites to helium has been qualified by gas-leakage tests. Corrosion tests with C/SiSiC coupons, both with and without a CVD pyrocarbon-SiC protective coating (bilayer) were performed using a ternary eutectic fluoride salt of LiF, NaF, and KF (FLiNaK) as the intermediate heat transfer fluid. While SiC is vulnerable to corrosion by the salt, such a coating offers a high degree of protection to the ceramic substrate.
机译：美国能源部报告了一种新的氢生产的概念，它结合了来自核电厂（一代IV反应器）或太阳能电力塔的使用，以在热化学反应中生产氢。陶瓷热交换器（HX）为这一概念提供了一个有希望的技术。提出了具有高功率密度的新型板式HXS，基于新颖的集成流道设计。本研究的主要目的是基于这些设计研究对原型HX组件的净形状制造。为了实现净形板，通过轴压模塑干粉混合物。通过层压完成的接合到原型3D HX堆叠，然后在高达1650℃的温度下热解。由于使用碳纤维，可以控制收缩并降低至约5％。最后，通过使用芯方法进入多孔C / C预制件，精确硅熔融渗透导致致密的C / SISIC陶瓷。进行微观结构和弯曲强度测量以证明陶瓷的均匀性和加入的质量。陶瓷复合材料到氦气的气密性已经通过气体泄漏测试符合资格。使用LiF，NAF和KF（Flinak）的三元共晶氟化物作为中间传热流体，进行具有和不含CVD吡烃保护涂层（双层）的C / SISIC优惠券的腐蚀试验。虽然SiC容易受到盐的腐蚀，但这种涂层为陶瓷基材提供了高度的保护。

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