Fabrication and thermal conductivity of UN-UB2 composites fabricated by spark plasma sintering

Fabrication and thermal conductivity of UN-UB2 composites fabricated by spark plasma sintering
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放电等离子烧结UN-UB2复合材料的制备及导热性能

DOI:
10.1016/j.jnucmat.2023.154738
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发表时间:
2023
影响因子:
3.1
通讯作者:
Mistarihi Q
Mistarihi Q
中科院分区:
工程技术2区
文献类型:
--
作者:
Mistarihi Q

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采用激光闪光法制备了混相UN-UB 2复合材料颗粒,并对其导热性能进行了研究。分别采用碳硼热还原法合成UB 2和UN,采用烧结-氮化-复相法合成UN,然后在1973 K下进行放电等离子烧结制备复合材料。对合成粉末的燃烧分析表明,合成的UN中存在C杂质。在SPS制造过程中形成了U-B-N三元相,作为UN和UB 2之间的相互作用产物。复合材料的热扩散率的分析表明,在测量过程中的复合材料的部分氧化。复合材料的校正热导率被发现增加UB 2含量高达1073 K(最高温度测量)。制造的复合材料表现出较高的热导率比联合国报告在低温(673 K)。然而,在较高的温度下增加不太显著,并且对于具有低UB 2含量(高达10重量%)的复合材料,发现热导率低于UN,可能是由于合成UN中的杂质。
The fabrication and thermal conductivity of mixed-phase UN-UB2composite pellets has been investigated using the laser flash method. Composites were fabricated by synthesizing UB2and UN via the carbo/borothermic reduction and hydriding-nitriding-denitriding routes respectively, followed by spark plasma sintering of pellets at 1973 K. Combustion analysis of the synthesized powder showed the existence of C impurity in the synthesized UN. A U-B-N ternary phase formed during SPS fabrication, as an interaction product between the UN and UB2. Analysis of the thermal diffusivity of the composites indicated the partial oxidation of the composites during measurements. The corrected thermal conductivity of the composites was found to increase with increasing UB2content up to 1073 K (maximum temperature measured). The fabricated composites showed a higher thermal conductivity than the reported UN at low temperatures (673 K). However, the increase was less significant at higher temperatures and the thermal conductivity was found to be lower than UN for composites with low UB2content (up to 10 wt.%), potentially due to impurities within the synthesised UN.
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