Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Thermal shock behavior study of the micro and nano structured alumina/aluminum titnate composites prepared by in-situ reaction sintering

Document Type : Original Reaearch Article

Authors
Manouchehr Sobhani 1
Touraj Ebadzadeh 2
Mohammad Reza Rahimipour 2
1 Faculty of Materials & Metallurgical Engineering, Semnan University, Semnan, Iran
2 Ceramic Department of Materials and Energy Research Center, Alborz, Iran
10.30501/jamt.2018.91739
Abstract
In the present study thermal shock behavior of monolothic alumina and two types of micro and nano aluminum tianate composites have been studied using quench-strength method. The powders were wet mixed and the slurry dried. Then the grinded powders were formed by isostatic pressing. The composites were prepared by in-situ reaction sintering of alumina with nano and micronized TiO2 addition to formation of 20 wt.% aluminum titanate as secondary phase. Investigations were carried out by s-DT curves, X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) analysis. The results revealed fully formation of Al2TiO5 phases in the both case of micro and nano titania as a result of Al2O3 and TiO2 reaction sintering. The nano layer structure of the Al2TiO5 ­was formed at the triple junction of the alumina grains. Also thermal shock values of the alumina, micro and nano composites were measured about 230, 265 and 290 °C, respectively. Thermal shock increment of the composite in the comparison of the alumina can be related to the secondary phase effect on the rising toughness curve (R-curve) and microcracking of the composites.
Keywords
Alumina/aluminium titnate
Thermal shock
In-situ sintering
Nano composite
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Journal of Advanced Materials and Technologies
Volume 7, Issue 3
Autumn 2018
Pages 25-33

  • Receive Date 14 April 2018
  • Revise Date 08 July 2018
  • Accept Date 18 August 2018