Hot pressed Si3N4 ceramics using MgO–Al2O3 as sintering additive for vehicles engine parts


https://doi.org/10.17073/1683-4518-2020-7-36-44

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Abstract

In an attempt to optimize a qualified ceramic material with enhanced and outstanding characteristics, the current work aims to study the processing of dense Si3N4 based ceramic composites by hot pressing method. The proposed material consists of an equimolecular mixture of α and β-Si3N4 with adding of variant amounts of MgO‒Al2O3 spinel as sintering additive. Investigation of the different characteristics of the obtained ceramics with respect to densification parameters, hardness, fracture toughness, bending strength and cold crushing strength was performed and correlated to their microstructure behavior. Results indicated that dense well distributed structure of silicon nitride ceramics was attained by adding of variant amounts of the magnesium aluminate spinel structure. Moreover, insertion of MgO‒ Al2O3 mixtures to Si3N4 ceramics was established to enhance their grains growth demeanor, increased the elongated β-Si3N4 grains and their aspect ratio. Furthermore, it was revealed that, increasing MgO ratio relative to Al2O3 one in the spinel structure was responsible for enhancing the different properties of the produced nitride ceramics. Results suggested that the obtained hot pressed Si3N4 ceramics seeded with β-Si3N4 particles can be a successful candidate in automotive industry as alternative parts for the vehicle engines.

About the Authors

M. A. A. Attia
Хелуанский университет, отделение машиностроения, инженерный факультет в Хелуане,
Russian Federation
Attia Mohamed A. A.


E. M. M. Ewais
Центральный металлургический научно-исследовательский институт (CMRDI), отделение огнеупорных и керамических материалов (RCMD)
Russian Federation
Ewais Emad Mohamed M.


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For citation: Attia M., Ewais E. Hot pressed Si3N4 ceramics using MgO–Al2O3 as sintering additive for vehicles engine parts. NOVYE OGNEUPORY (NEW REFRACTORIES). 2020;(7):36-44. https://doi.org/10.17073/1683-4518-2020-7-36-44

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