TY - JOUR

T1 - Statistical study of compressive creep parameters of an alumina spinel refractory

AU - Samadi, Soheil

AU - Jin, Shengli

AU - Gruber, Dietmar

AU - Harmuth, Harald

AU - Schachner, Stefan

PY - 2020/3/1

Y1 - 2020/3/1

N2 - Refractory microstructure and phase composition play important roles in the creep resistance of refractories at high temperatures. The production processing causes heterogeneity of refractory microstructure, which affects the determination of representative creep parameters. The present study focused on the statistical study of compressive creep parameters with a limited number of tests. Different sampling approaches were applied to examine the influence of the heterogeneity. A correlation analysis exhibited an evident negative correlation coefficient between the bulk density of specimens and their creep strain rates. The Norton-Bailey creep parameters of the primary creep stage were received with an inverse evaluation method from datasets with different number of uniaxial compressive creep curves under at least two different constant loads. Their mean values and standard deviations were evaluated for different temperatures. The statistical results of the dataset with combined 7 creep curves (out of 9) allow for elaborated considering the microstructural heterogeneity of refractories in the thermomechanical modelling of industry vessels.

AB - Refractory microstructure and phase composition play important roles in the creep resistance of refractories at high temperatures. The production processing causes heterogeneity of refractory microstructure, which affects the determination of representative creep parameters. The present study focused on the statistical study of compressive creep parameters with a limited number of tests. Different sampling approaches were applied to examine the influence of the heterogeneity. A correlation analysis exhibited an evident negative correlation coefficient between the bulk density of specimens and their creep strain rates. The Norton-Bailey creep parameters of the primary creep stage were received with an inverse evaluation method from datasets with different number of uniaxial compressive creep curves under at least two different constant loads. Their mean values and standard deviations were evaluated for different temperatures. The statistical results of the dataset with combined 7 creep curves (out of 9) allow for elaborated considering the microstructural heterogeneity of refractories in the thermomechanical modelling of industry vessels.

KW - Creep

KW - heterogeneity

KW - statistical study

KW - Refractories

UR - http://www.scopus.com/inward/record.url?scp=85081017201&partnerID=8YFLogxK

U2 - https://doi.org/10.1016/j.ceramint.2020.02.267

DO - https://doi.org/10.1016/j.ceramint.2020.02.267

M3 - Article

VL - 46.2020

SP - 14662

EP - 14668

JO - Ceramics International : CI

JF - Ceramics International : CI

SN - 0272-8842

IS - 10A

ER -