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Indexed by:Journal Papers

Date of Publication:2019-11-01

Journal:DIAMOND AND RELATED MATERIALS

Included Journals:EI、SCIE

Volume:99

ISSN No.:0925-9635

Key Words:Nanoparticles; Nanotubes; High pressure high temperature; Absorption; Gaseous detonation

Abstract:The gaseous hydrocarbon fuels were ignited by a 20J high energy electric spark in a gaseous detonation tube. The possibility of direct detonation and the stable propagation of detonation wave in the tube were analysed. The cobalt(III) acetylacetonate (Co(acac)(3)) was decomposed by high temperature generated via gaseous detonation to prepare Co-C materials. The characterization results indicated that the Co-C materials prepared by 2H(2)-O-2 detonation consisted of nano-sized Co@C particles and micron-sized CNTs in length. While the Co-C materials fabricated by CH4-2O(2) and C2H2-2O(2) detonation were micron-sized Co@C particles. The morphology of Co-C materials were greatly affected by the combustion heat of the gaseous hydrocarbon fuels, the higher the combustion heat, the larger particle size of Co@C. The degree of graphitization of Co@C was low, while the crystallinity of Co was relatively high. The growth mechanism of Co-C materials was discussed by using detonation collision model and ZND model. The minimum RL value of Co@C particles-paraffin mixture was - 3.8 dB at 13.9 GHz with thickness of 3 mm.