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Influence of Additives on Slag Resistance of Al 2 O 3 ‐SiO 2 ‐SiC‐C Refractory Bond Phases under Reducing Atmosphere
Author(s) -
Chan ChenFeng,
Argent Bernard B.,
Lee William E.
Publication year - 1998
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/j.1151-2916.1998.tb02754.x
Subject(s) - materials science , slag (welding) , silicon , penetration (warfare) , corundum , metallurgy , crucible (geodemography) , boron , aluminium , microstructure , carbon fibers , composite material , chemistry , composite number , computational chemistry , organic chemistry , operations research , engineering
The microstructures of Al 2 O 3 –SiO 2 –SiC–C refractory matrices with aluminum, silicon, Si 3 N 4 , BN, B 2 O 3 , and B 4 C additives are characterized before and after a crucible slag test, and the phases present are compared to those expected at thermodynamic equilibrium. The carbon content dominates the resistance to CaO–MgO–Al 2 O 3 –SiO 2 slag penetration, while the viscosity of liquid phases present has a significant influence when the matrix carbon contents are similar. Silicon and Si 3 N 4 additives reduce slag penetration resistance because of indirect oxidation of carbon to form SiC. B 4 C, in particular, and B 2 O 3 also reduce slag penetration resistance because of formation of a more fluid boron‐containing liquid, while aluminum and BN addition have no significant effect. Carbon and BN hardly react with the slag, while SiC partially reacts with it, leading to deposition of carbon as a dense layer. Corundum present in the refractories also readily dissolves in the slag. Microstructurally, slag penetration resistance is associated with the dense carbon layer located at the slag‐refractory interface.