1989 Volume 75 Issue 6 Pages 894-901
Mechanical properties of eight commercial carbon refractories for blast furnace were examined. Test pieces were cut from large carbon blocks. Bending, compressing and diametral-compressing tests at room temperature and bending test at high temperature were carried out.
Main results are as follows;
(1)Correlations were obtained between elastic modulus and compressive strength and also between bending strength and compressing strength.
(2)There is much difference among commercial carbon refractories in the size of latent crack at matrix-aggregate bond. Those which have small latent crack have high bending strength/elastic modulus ratio and have small an-isotropy of bending strength.
(3)There is variance in bending strength in large carbon block. The variance of bending strength in each carbon block depends on the variance of its porosity.
(4)At high temperatures, bending strength decreases with the increase of SiO2 contents.