Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites

The SiC/Si3N4 composites were fabricated with sintering process. To produce SiC/Si3N4 composite components, slurry mixtures containing Si/SiC powders were used by the slip casting method. In order to investigate the effect of dispersants and additives on the rheological properties and the body caste...

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Main Authors: Shahrestani, Shohreh, Ismail, Mokhtar Che, Kakooei, Saeid, Beheshti, Mohammadali
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.24321 /
Published: ELSEVIER SCI LTD 2020
Online Access: http://eprints.utp.edu.my/24321/
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spelling utp-eprints.243212021-08-27T04:37:34Z Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites Shahrestani, Shohreh Ismail, Mokhtar Che Kakooei, Saeid Beheshti, Mohammadali The SiC/Si3N4 composites were fabricated with sintering process. To produce SiC/Si3N4 composite components, slurry mixtures containing Si/SiC powders were used by the slip casting method. In order to investigate the effect of dispersants and additives on the rheological properties and the body casted, slurries with concentration of 70% solid weight were prepared. It included a mixture of silicon and silicon carbide with weight ratios of 30 wt% and 70 wt%, respectively, and various weight percentages of Ball clay as lubricant and Tiron (sodium salt of benzene disulfonic acid) as dispersant at pH value of 7. After preparing the green bodies by slip casting method by using plaster mold, the samples were sintered at 1450 degrees C inside an atmospheric-controlled furnace under a pressure of 0.12 MPa of nitrogen gas for 2 h. By examining the rheological properties of the slurry and the sintering properties, it was concluded that the best slurry was obtained in terms of viscosity, density, porosity and strength using 5 wt% Ball clay and 0.5 wt% Tiron. Phase transformations, microstructure and morphology of the sintered specimens were accomplished by Field Emission Scanning Electron Microscopy (FESEM) examination and X-ray diffraction experimental analysis. XRD and FESEM results demonstrated that the composite fabricated by slurry containing 5 wt% Ball clay and 0.5 wt% Tiron had the least porosity without SiO2 phase. ELSEVIER SCI LTD 2020 Article NonPeerReviewed Shahrestani, Shohreh and Ismail, Mokhtar Che and Kakooei, Saeid and Beheshti, Mohammadali (2020) Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites. CERAMICS INTERNATIONAL, 46 (5). pp. 6182-6190. http://eprints.utp.edu.my/24321/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description The SiC/Si3N4 composites were fabricated with sintering process. To produce SiC/Si3N4 composite components, slurry mixtures containing Si/SiC powders were used by the slip casting method. In order to investigate the effect of dispersants and additives on the rheological properties and the body casted, slurries with concentration of 70% solid weight were prepared. It included a mixture of silicon and silicon carbide with weight ratios of 30 wt% and 70 wt%, respectively, and various weight percentages of Ball clay as lubricant and Tiron (sodium salt of benzene disulfonic acid) as dispersant at pH value of 7. After preparing the green bodies by slip casting method by using plaster mold, the samples were sintered at 1450 degrees C inside an atmospheric-controlled furnace under a pressure of 0.12 MPa of nitrogen gas for 2 h. By examining the rheological properties of the slurry and the sintering properties, it was concluded that the best slurry was obtained in terms of viscosity, density, porosity and strength using 5 wt% Ball clay and 0.5 wt% Tiron. Phase transformations, microstructure and morphology of the sintered specimens were accomplished by Field Emission Scanning Electron Microscopy (FESEM) examination and X-ray diffraction experimental analysis. XRD and FESEM results demonstrated that the composite fabricated by slurry containing 5 wt% Ball clay and 0.5 wt% Tiron had the least porosity without SiO2 phase.
format Article
author Shahrestani, Shohreh
Ismail, Mokhtar Che
Kakooei, Saeid
Beheshti, Mohammadali
spellingShingle Shahrestani, Shohreh
Ismail, Mokhtar Che
Kakooei, Saeid
Beheshti, Mohammadali
Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites
author_sort Shahrestani, Shohreh
title Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites
title_short Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites
title_full Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites
title_fullStr Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites
title_full_unstemmed Effect of additives on slip casting rheology, microstructure and mechanical properties of Si3N4/SiC composites
title_sort effect of additives on slip casting rheology, microstructure and mechanical properties of si3n4/sic composites
publisher ELSEVIER SCI LTD
publishDate 2020
url http://eprints.utp.edu.my/24321/
_version_ 1741196817126653952
score 11.62408

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