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Preparation of calcium aluminate cement by combustion synthesis and application for corundum‐based castables
Author(s) -
Yang Shoulei,
Xiao Guoqing,
Ding Donghai,
Ren Yun,
Lv Lihua,
Yang Pan
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12831
Subject(s) - aluminate , materials science , corundum , cement , molar ratio , porosity , raw material , calcium , phase (matter) , combustion , chemical engineering , compressive strength , mineralogy , nuclear chemistry , composite material , metallurgy , catalysis , organic chemistry , chemistry , engineering
Calcium aluminate cement was prepared by combustion synthesis with CaO 2 , Al, and Al 2 O 3 as raw materials. The effects of CaO/Al 2 O 3 (C/A) molar ratios in raw materials on the phase compositions and morphologies of calcium aluminate were investigated in detail. It was found that when the C/A reduced from 1.1 to 0.74, the content of CaO·2Al 2 O 3 ( CA 2 ) in products increased, whereas contents of CaO·Al 2 O 3 ( CA ) and 12CaO·7Al 2 O 3 (C 12 A 7 ) decreased; when the C/A was 0.8, the phase composition of product ( CS 71) was equal to that of Secar71. Additionally, the crystallines of CA and CA 2 in the product were reduced when the C/A molar ratio was decreased. And then, the bulk density, apparent porosity, permanent linear change, cold crushing strength ( CCS ), and cold modulus of rupture ( CMOR ) of the corundum‐based castables bonded with CS 71, Secar7 were compared. The castables bonded with CS 71 demonstrate obviously improved CCS , CMOR , and volume stability.
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