Microstructures and mechanical properties of pyrocarbons produced from phenolic resin with added Ni(NO3)2

A refractory containing graphite is commonly used in the metallurgical industry in locations subject to severe thermal shock because of the high thermal conductivity and good thermal shock resistance of graphite. However, a refractory that uses phenolic resin as the carbon precursor is brittle, and...

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Bibliographic Details
Published inNew carbon materials Vol. 32; no. 2; pp. 137 - 142
Main Authors Ma, Tian-fei, Wu, Xiao-xian, Li, Hong-xia, Liu, Guo-qi, Yang, Wen-gang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.2017
Subjects
Carbonized structure
Mechanical properties
Ni(NO3)2
Phenolic resin
Mechanical properties
Phenolic resin
Ni(NO3)2
Carbonized structure
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Summary:A refractory containing graphite is commonly used in the metallurgical industry in locations subject to severe thermal shock because of the high thermal conductivity and good thermal shock resistance of graphite. However, a refractory that uses phenolic resin as the carbon precursor is brittle, and to improve its strength and toughness, Ni(NO3)2 is added to the resin to catalyze the in-situ formation of carbon nanofibers/nanotubes. The microstructure and mechanical properties of the Ni(NO3)2-modified phenolic resin carbons were characterized by XRD, SEM, TEM and mechanical tests. Results indicate that carbon nanofibers/nanotubes (2% by volume) were formed within the pyrocarbons as a result of the nickel catalyst and these are interconnected to form a network structure. The nanocarbon fibers/tubes significantly improve the bend strength, elastic modulus, tensile strength and fracture toughness of the pyrocarbons and their fracture energies are increased accordingly.
ISSN:1872-5805
1872-5805
DOI:10.1016/S1872-5805(17)60111-2