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Carbothermal conversion of self‐supporting organic/inorganic interpenetrating networks to porous metal boride monoliths
Author(s) -
Li Fei,
Liu JiXuan,
Huang Xiao,
Bao Weichao,
Zhang GuoJun,
Wang Hongzhi
Publication year - 2019
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.16488
Subject(s) - monolith , materials science , porosity , carbothermic reaction , boride , chemical engineering , ceramic , composite material , catalysis , organic chemistry , chemistry , carbide , engineering
In this work, we present a general sol‐gel protocol for the synthesis of highly porous monolithic transition metal borides via carbothermal conversion of the organic/inorganic interpenetrating networks (IPNs). The formation of organic/inorganic IPNs is clearly demonstrated by simple oxidation and boiling water treatment. A series of transition metal boride porous monoliths, including CrB 2 , ZrB 2 , TiB 2 , Cr 3 C 2 /CrB, and ZrB 2 /ZrC with porosities ranging from 70% to 85% and pore sizes ranging from 0.5 to 35 μm, have been prepared. In each case, a porous hybrid monolith is obtained by drying the wet gel under ambient pressure. It is believed that the formation of organic/inorganic IPNs strengthens the gel network, so that it can withstand the severe changes during desiccation to give out a monolithic xerogel. Samples are characterized by TG‐DSC, XRD, SEM, EDS, TEM, BET, and MIP, and the ceramic monoliths are shown to be well defined and rather homogeneous.