Exploring Microstructure and Bending Strength of Al2O3 Ceramics Doped with Sm2O3 Rare-Earth Oxide: Impact of Volume Ratios and Sintering Temperatures

Year 2023, Volume: 13 Issue: 4, 1581 - 1594, 15.12.2023

Seda Taşdemir , Betül Kafkaslıoğlu Yıldız , Elif Işık , Yahya Tür

https://doi.org/10.31466/kfbd.1323317

Cited By: 1

Abstract

The effects of low amounts (0, 0.1, 0.3, 0.5, 0.8, 1, 2vol%) of Sm2O3 on the densification, microstructure, and bending strength of Al2O3 were studied for different sintering temperatures. Sm2O3 and Al2O3 powders were mixed by ball milling, and Al2O3-Sm2O3 ceramics were prepared by dry and cold isostatic pressing in disc form before pressureless sintering at 1550°C and 1600°C/2 h in the air, separately. Sm2O3 reacted with Al2O3 by forming SmAlO3. The rod-like morphology of the SmAlO3 was generally achieved for 0.8 and 1vol% Sm2O3 for sintering at 1600°C, whereas the rod-like form was more obvious for the samples sintered at 1550°C. Similar relative densities were attained for all Sm2O3 ratios at both sintering temperatures, but the Al2O3 sintered at 1550°C exhibited higher densification than the Al2O3 sintered at 1600°C. The strength values were close, while a strength increase of about 5% was obtained for 0.5 vol% Sm2O3 containing ceramics sintered at 1600°C caused by the higher densification compared to the Al2O3. The strength showed a prominent drop above the ratio of 0.1 vol% Sm2O3 for sintering at 1550°C. The addition of present amounts of Sm2O3 did not have a significant effect on the mechanical properties of Al2O3 but it changed the microstructure.

Keywords

Al2O3, Sm2O3, microstructure, mechanical properties

Supporting Institution

Tübitak

Project Number

122M179

Thanks

This work was supported by the Scientific and Technical Research Council of Turkey-TUBITAK through the project no 122M179. This article was also prepared from the studies of Seda Taşdemir for her master's degree at Sivas University of Science and Technology, Defense Technology Programme. The authors thank Dr. Halil İbrahim Çetintaş and Adem Şen for their assistance in the SEM and XRD analysis of this study, respectively.

Sm2O3 Nadir Toprak Oksit Katkılı Al2O3 Seramiklerinin Mikro Yapısının ve Eğilme Dayanımının İncelenmesi: Hacim Oranlarının ve Sinterleme Sıcaklıklarının Etkisi

Abstract

Düşük miktarlarda (0, 0,1, 0,3, 0,5, 0,8, 1, 2 hac.%) Sm2O3'ün Al2O3'ün yoğunlaşma, mikroyapı ve eğilme dayanımı üzerindeki etkileri farklı sinterleme sıcaklıkları için incelenmiştir. Sm2O3 ve Al2O3 tozları bilyeli öğütme ile karıştırılmış ve Al2O3-Sm2O3 seramikleri, ayrı ayrı 1550°C'de ve 1600°C/2 saat havada basınçsız sinterlemeden önce disk formunda kuru ve soğuk izostatik presleme ile hazırlanmıştır. Sm2O3, Al2O3 ile reaksiyona girerek SmAlO3 oluşturmuştur. SmAlO3'ün çubuk benzeri morfolojisi, 1600°C'de sinterleme için genel olarak hacimce %0,8 ve 1 Sm2O3 için elde edilirken, 1550°C'de sinterlenen numunelerde çubuk benzeri form daha belirgin olmuştur. Her iki sinterleme sıcaklığında da tüm Sm2O3 oranları için benzer relatif yoğunluklar elde edilmiştir ancak 1550°C'de sinterlenen Al2O3, 1600°C'de sinterlenen Al2O3’e göre daha yüksek yoğunlaşma sergilemiştir. 1600°C'de sinterlenen hac.%0,5 Sm2O3 içeren seramiklerde, Al2O3'e göre daha yüksek yoğunlaşma sebebiyle yaklaşık %5'lik bir mukavemet artışı elde edilirken, mukavemet değerleri genelde birbirine yakın olmuştur. Mukavemet, 1550°C'de sinterleme için hac.%0,1 Sm2O3 oranının üzerinde belirgin bir düşüş göstermiştir. Mevcut miktarlarda Sm2O3 ilavesinin Al2O3'ün mekanik özellikleri üzerinde önemli bir etkisi olmamıştır, ancak mikroyapıyı değiştirmiştir.

Keywords

Al2O3, Sm2O3, mikroyapı, mekanik özellikler

Project Number

122M179

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