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J. Korean Ceram. Soc. > Volume 57(2); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(2): 184-191.
doi: https://doi.org/10.1007/s43207-020-00020-5
Characteristics of lightweight diatomite‑based insulating firebricks
Serkan Dal1 , Mucahit Sutcu2 , Mustafa Sabri Gok3, Osman Gencel4
1Department of Metallurgical and Materials Engineering, Nevsehir Haci Bektas Veli University, 50300 Nevşehir, Turkey
2Department of Materials Science and Engineering, Izmir Katip Celebi University, 35620 Izmir, Turkey
3Department of Mechanical Engineering, Bartin University, 74100 Bartın, Turkey
4Department of Civil Engineering, Bartin University, 74100 Bartın, Turkey
Correspondence  Mucahit Sutcu ,Email: mucahit.sutcu@ikc.edu.tr
Received: October 11, 2019; Revised: December 22, 2019   Accepted: December 23, 2019.  Published online: February 29, 2020.
ABSTRACT
This study covers the physical, thermal, mechanical, and microstructural properties of porous ceramic materials produced from mixtures containing refractory clay and diatomite in different proportions. The raw materials were characterized by chemical (X-ray fluorescence), thermal (thermogravimetry), morphological (scanning electron microscopy), and phase (X-ray diffraction) analysis techniques. The prepared samples were sintered at different firing temperatures between 900 and 1100 °C in an electrical furnace. The bulk densities, apparent porosities, linear dimensional shrinkages, compression strengths, thermal conductivities, and microstructural properties of the sintered samples were investigated. The porosity of the sample with 90% diatomite content increased to 55.4%, density decreased to 1.02 g/cm3, and thermal conductivity coefficient decreased to 0.32 W/mK.
Key words: Diatomite · Sintering · Porosity · Thermal conductivity · Microstructure
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