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Synthesis of TiB 2 from a carbon‐coated precursors method
Author(s) -
Fu Zhezhen,
Koc Rasit
Publication year - 2017
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.14794
Subject(s) - carbon fibers , economies of agglomeration , materials science , oxygen , chemical engineering , particle size , particle (ecology) , relative density , phase (matter) , mixing (physics) , microstructure , chemistry , metallurgy , composite material , organic chemistry , composite number , oceanography , engineering , geology , physics , quantum mechanics
This article deals with the synthesis of TiB 2 from carbon‐coated TiO 2 precursors with the addition of B 4 C. The carbon‐coated precursors method alters the reaction process, compared with the conventional mixing of reactants, to produce high‐quality TiB 2 powders. The produced powders have a single phase, a submicron particle size (~0.3 to 0.8 μm), regular shape, loose agglomeration, and low level of contaminations (less than 0.5 wt% carbon and 0.6 wt% oxygen). The formation mechanism proposed is based on experimental results and thermodynamic evaluations. For comparison, the powders obtained from the mixture of reactants show higher agglomeration, a large particle size (>1 μm), high level of contaminations (0.7 wt% carbon and 1.1 wt% oxygen), and difficulty to control the reaction process (formation of Ti BO 3 and Ti 2 O 3 as the intermediate phases). The synthesized powders from the precursors method can be hot pressed to a relative density of ~94.5% with the formation of platelike grains at 1800°C under a pressure of 35 MPa without additives.