Open AccessComparison of weight‐loss changes with different compositions of ZrB 2 nanoparticles in carbon fabric–novolac composite at high temperature
Author(s) -
Amirsardari Zahra,
Mehdinavaz Aghdam Rouhollah
Publication year - 2017
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2017.0071
Subject(s) - materials science , composite material , composite number , zirconium diboride , nanoparticle , char , thermal conductivity , combustion , carbon nanoparticles , polymer , insulator (electricity) , nanotechnology , organic chemistry , chemistry , sintering
To improve the thermal properties of novolac resin, zirconium diboride (ZrB 2 ) nanoparticles (ZNP) with different weight percentages (0, 2, 4 and 7) were introduced into novolac resin. ZrB 2 nanoparticles modified carbon–novolac (C–N) composites were used to determine and compare the ablation performance, thermal stresses and cracks, and mechanical properties of these modified polymer composites. Thermal protection via ablation was achieved through a self‐regulating heat and mass transfer process involving an insulator with low thermal conductivity and concomitant formation of a hard char on the insulator surface after 160 s exposure to the combustion environment. Anti‐oxidation mechanisms for the novolac resin modified with nanoparticles at different weight percentage were compared and discussed. Ablation performance shows a steady increase with the filler content until a maximum, at 4 wt% of ZNP, and then it decreases.