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Effect of heat treatment on the creep behavior of α/β SiAl ON sintered with multication oxide sintering additives
Author(s) -
Turan Dilek,
Uludag Alper,
Turan Servet
Publication year - 2018
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.13078
Subject(s) - creep , materials science , sintering , microstructure , composite material , metallurgy , ceramic
SiAl ON s are important materials for high‐temperature applications and creep properties of SiAl ON s are largely controlled by the amount and type of sintering additives. It has been established that heat treatment can reduce the amount of amorphous intergranular phase through crystallization. However, there is no study on the creep behavior of heat‐treated SiAl ON ceramics containing multication sintering additives. Therefore, the aim of the study was to investigate the effect of heat treatment on the creep properties of multication containing (Y‐Sm‐Ca oxides) α/β‐SiAl ON ceramics. The heat treatments of the sintered samples were carried out at 1600°C for 2 hours. The creep tests were carried out in the range 1300‐1400°C under different loads (50‐150 MPa). The existing phases and the microstructures of samples before and after creep were investigated using XRD and SEM techniques. It was found that heat treatment resulted in a better creep performance compared to as‐sintered samples. The activation energy and stress exponent for heat‐treated SiAl ON s were also calculated as 708 ± 45 kJ/mol and 1.4, respectively. Compared to the sintered sample values, the results suggested that the acting creep mechanism of grain‐boundary sliding and cavitation was reduced with the heat treatment.