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Preparation of the highly dense ceramic-metal fuel particle with fine-grained tungsten layer by chemical vapor deposition for the application in nuclear thermal propulsion

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tungsten 2022年第1期4卷 1-9页

作者： Li-Hua Guo Feng Zhang Lin-Yuan Lu Yan You Jun-Qiang Lu Li-Bing Zhu Jun Lin Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Wuwei Institute of New Energy Wuwei 733000China Shanghai Nuclear Engineering Research and Design Institute Co. Ltd.Shanghai 200233China

The cermet fuel element was achieved by dispersing the UO_(2)particles with or without tungsten(W)coating layer uniformly in the W *** is considered to be a robust and secure fuel for use in nuclear thermal propulsion in the near *** this study,the effect of deposition temperature on the densification and grain refinement of the W coating layer was investigated.A high-density(19.24 g·cm^(-3))W layer with a uniform thickness(~10μm)and fine grains(~297 nm)was prepared by spouted-bed chemical vapor *** prepared high-density,fine-grained W layer has the following *** can prevent direct contact between fuel particles,resulting in a more uniform fuel *** addition,it can decrease the reaction probability between the fuel kernel and H2,and prevent the release of fission products from the fuel kernel by extending the diffusion path at grain boundaries more ***,the high-density,fine-grained W layer showed outstanding thermal and mechanical *** average hardness and Young's modulus were approximately 7 and 200 GPa,*** thermal conductivity of the W film was 101-124 W·m^(-1)·K^(-1)at 298-773 *** work furthers our understanding of the potential application of the high-density,fine-grained W layer in nuclear thermal propulsion.

关键词： Deposition temperature tungsten layer Ceramic-metal fuel particle Nuclear thermal propulsion Chemical vapor deposition

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Friction and wear properties of copper matrix composites reinforced by tungsten-coated carbon nanotubes

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Rare Metals 2011年第6期30卷 657-663页

作者： NIE Junhui JIA Xian JIA Chengchang LI Yi ZHANG Yafeng SHI Na School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China China Iron ＆ Steel Research Institute Group Beijing 100081 China Journals Publishing Center University of Science and Technology Beijing Beijing 100083 China

Carbon nanotubes （CNTs） were coated by tungsten layer using metal organic chemical vapor deposition process with tungsten hexacarbonyl as a precursor. The W-coated CNTs （W-CNTs） were dispersed into Cu powders by magnetic stirring process and then the mixed powders were consolidated by spark plasma sintering to fabricate W-CNTs/Cu composites. The CNTs/Cu composites were fabricated using the similafprocesses. The friction coefficient and mass wear loss of W-CNTs/Cu and CNTs/Cu composites were studied. The results showed that the W-CNT content, interfacial bonding situation, and applied load could influence the friction coefficient and wear loss of W-CNTs/Cu com- posites. When the W-CNT content was 1.0 wt.%, the W-CNTs/Cu composites got the minimum friction coefficient and wear loss, which were decreased by 72.1% and 47.6%, respectively, compared with pure Cu specimen. The friction coefficient and wear loss of W-CNTs/Cu composites were lower than those of CNTs/Cu composites, which was due to that the interracial bonding at （W-CNTs）-Cu interface was better than that at CNTs-Cu interface. The friction coefficient of composites did not vary obviously with increasing applied load, while the wear loss of composites increased significantly with the increase of applied load.

关键词： carbon nanotubes tungsten layer copper friction coefficient wear loss

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