Interaction of palladium, the rare earths, and silver with silicon carbide in HTGR fuel particles
Interaction of palladium, the rare earths, and silver with silicon carbide in HTGR fuel particles
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高温气冷堆燃料颗粒中钯、稀土和银与碳化硅的相互作用
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
T. Lindemer
中科院分区：
文献类型：
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作者：
R. Pearson;R. Lauf;T. Lindemer
在 1500 至 1780 K 的温度范围内，研究了模拟裂变产物钯、稀土和银与碳化硅 (SIC) Triso 涂层高温气冷反应堆 (HTGR) 粒子的相互作用。钯和稀土在长达 8600 小时（0.98 年）的时间内按照时间比例（而不是时间的平方根）相互作用， 研究的时间限制。建议采用晶界机制。与温度影响相比，SiC 微观结构对钯反应速率的影响很小。观察到银与 SiC 的相互作用，但无法量化。在第二组实验中，向含碳化物颗粒中添加硅导致U-Pd-Si-C化合物保留在颗粒中。只要不存在稀土碳化物，它们就能阻止钯与 SiC 在 1670 至 1920 K 的温度下发生反应。
The interactions of the simulated fission products palladium, rare earths, and silver with the silicon carbide (SIC) Triso-coated, high-temperature, gas-cooled reactor (HTGR) particles were investigated out-of-reactor in the temperature range 1500 to 1780 K. Both palladium and the rare earths interact in proportion to time (rather than the square root of time) up to 8600 h (0.98 year), the time limit of the study. Grain-boundary mechanisms are suggested. Effects of the SiC microstructure on the palladium reaction rate were minimal in comparison to the temperature effects. Silver interactions with SiC were observed, but could not be quantified. In a second set of experiments, the addition of silicon to carbide-containing kernels resulted in retention of U-Pd-Si-C compounds in the kernel. These prevented the reaction of palladium with SiC at temperatures of 1670 to 1920 K as long as rare-earth carbides were not present.