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Synthesis of rare earth containing single‐phase multicomponent metal carbides via liquid polymer precursor route
Author(s) -
Sun Yanan,
Chen Fenghua,
Qiu Wenfeng,
Ye Li,
Han Weijian,
Zhao Wenying,
Zhou Heng,
Zhao Tong
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17332
Subject(s) - materials science , carbide , ceramic , polymer , metal , phase (matter) , chemical engineering , condensation polymer , inorganic chemistry , metallurgy , composite material , organic chemistry , chemistry , engineering
Novel high‐entropy carbide ceramics (HEC) containing rare earth metals, namely (Ti, Zr, Hf, Ta, La, Y)C, (Ti, Zr, Hf, Ta, Nb, La, Y)C, and (Ti, Zr, Hf, Ta, Nb, Mo, W, La)C were prepared with single‐phase structure by polymer precursor method. Controlled co‐hydrolysis and polycondensation of equiatomic metal‐containing monomers were conducted successively, followed by blending allyl‐functional novolac resin as carbon source, and the polymer precursors were obtained as clear viscous liquid solutions. The single‐phase formation possibility was theoretically analyzed from the aspects of size‐effect parameter δ of the designed compositions. All as‐obtained ceramics possessed single face‐centered‐cubic structure of metal carbides and high‐compositional uniformity from nanoscale to microscale. The (Ti, Zr, Hf, Ta, Nb, Mo, W, La)C ceramic powder pyrolyzed at 1800°C exhibited low‐oxygen impurity content of 1.2 wt%. Thus, multicomponent high‐entropy carbide nanoceramics with over five metal elements containing even rare earth element were firstly synthesized and characterized.