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      https://www.ias.ac.in/article/fulltext/boms/041/01/0011

    • Keywords

       

      Hafnium diboride nanoparticles; multi-walled carbon nanotube; phenolic composites; thermal management.

    • Abstract

       

      Carbon–novolac composites (C–C) modified by HfB$_2$ and MWCNT were ablated by an oxyacetylene torch at 2500$^{\circ}$C to investigate the thermal behaviour and the mechanism of mass loss of the samples. Two phenolic matrix composites containing 4 wt% HfB$_2$ nanoparticle and with or without MWCNT were fabricated. These nanoparticles dissipate heatthroughout the sample, thereby reducing thermal gradients, reducing the intensity of heating at the surface exposed to flame,and insulating the carbonaceous char with the network of HfO$_2$/MWCNT/char. During ablation, HfO$_2$ particles formed and functioned as a thermal barrier, and MWCNT char phase acted as an oxygen diffusion barrier, protecting composites fromfurther ablation.

    • Author Affiliations

       

      ZAHRA AMIRSARDARI1 ROUHOLLAH MEHDINAVAZ AGHDAM2 MOHAMMAD REZA JAHANNAMA1

      1. Space Transportation Research Institute, Iranian Space Research Center, Tehran, Iran
      2. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 1417466191, Iran
    • Dates

       
  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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