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叙述了用热分析方法研究U_3Si_2在Ar、N_2和空气中的热稳定性,以及U_3Si_2/Al、U_3Si_2/Zr间的相互反应。实验结果表明,U_3Si_2/Al弥散体生坯在空气中加热时,生坯中Al基体并不能完全防止U_3Si_2的氧化;U_3Si_2颗粒在钢瓶N_2气(99.95％)中加热时,在689℃时有一放热峰,经X射线鉴定,U_3Si_2与N_2反应生成UN_2;U_3Si_2颗粒在钢瓶Ar气(99.95％)中加热到1000℃时,无任何反应。U_3Si_2/Zr弥散体冷压块,在瞬态温度加热过程中,929℃时有可测得的反应。根据热分析结果,对U_3Si_2-Al弥散型燃料板生产中的各工序防护措施进行了改进。生产实践证明,这些改进后的防护措施有效地保证了安全生产及产品质量,并降低了成本。
The thermal stability of U_3Si_2 in Ar, N_2 and air, as well as the interaction between U_3Si_2 / Al and U_3Si_2 / Zr were described by means of thermal analysis. The experimental results show that when the U_3Si_2 / Al green compact is heated in air, the Al matrix in the green body can not completely prevent the oxidation of U_3Si_2. When the U_3Si_2 particles are heated in the N_2 gas (99.95%), The thermal peak was identified by X-ray. U_3Si_2 reacted with N_2 to produce UN_2. U_3Si_2 particles did not react when heated to 1000 ℃ in Ar gas (99.95%). U_3Si_2 / Zr dispersion cold compact, in the transient temperature heating process, 929 ℃ have a measurable reaction. According to the results of thermal analysis, the protective measures of each process in the production of U_3Si_2-Al dispersion fuel plate are improved. Production practice has proved that these improved protective measures effectively ensure safety production and product quality, and reduce costs.