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Title

Significance of composition and hot pressing parameters on densification behavior, grain growth and hardness of ZrB2–SiC–Csf composites

دهمین همایش مشترک و پنجمین کنفرانس بین المللی انجمن مهندسی مواد و متالورژی و انجمن علمی ریخته گری ایران
Year: 1395
COI: IMES10_430
Language: EnglishView: 267
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Authors

mehdi shahedi asl - Assistant Professor, Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
Behzad Nayebi - PhD student, Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
Iman Farahbakhsh - Assistant Professor, Department of Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran
Abbas Sabahi Namini - PhD, Department of Materials Engineering, Sahand University of Technology, Tabriz, Iran

Abstract:

The influences of processing variables on densification, grain growth and hardness of hot pressed ZrB2-based composites, reinforced with different amounts of SiC and short carbon fibers (Csf), were investigated. Taguchi methodology was employed as the design of experiments to study the properties of ZrB2–SiC–Csf composites. Hot pressing parameters (sintering temperature, dwell time and applied pressure) and the amount of additives (vol% SiC / vol% Csf) were specified as the variables. The microstructural analysis by SEM showed that Csf acts as a sintering aid through eliminating the oxide impurities the surfaces of starting materials. In addition, the in-situ formation of interfacial ZrC phase assisted the sintering process of ZrB2-based ceramics. Removal of oxide impurities and the presence of ZrC hindered the growth of ZrB2 grains, similar to the pinning of grain boundaries by SiC. Analysis of variance (ANOVA) recognized the sintering temperature as the most effective variable on the relative density, mean ZrB2 grain size and hardness of hot pressed composites. After sintering temperature, SiC/Csf ratio (composition) was identified as the second effective variable on the relative density and grain size, however, the composition did not remarkably affect the hardness. The applied external pressure and dwell time had not significant effects on the investigated properties

Keywords:

Paper COI Code

This Paper COI Code is IMES10_430. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/574866/

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shahedi asl, mehdi and Nayebi, Behzad and Farahbakhsh, Iman and Sabahi Namini, Abbas,1395,Significance of composition and hot pressing parameters on densification behavior, grain growth and hardness of ZrB2–SiC–Csf composites,10th joint meeting of the 5th International Conference on Materials and Metallurgical Engineering Society and Iranian Foundry Society,Shiraz,https://civilica.com/doc/574866

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Type of center: دانشگاه دولتی
Paper count: 14,510
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