Chemo-Rheological Behavior of Aqueous Titanium Carbide Suspension and Evaluation of the Gelcasted Green Body Properties

Hamze Foratirad,Hamid Reza Baharvandi,Mohammad Ghanadi Maragheh

doi:10.1590/1980-5373-mr-2016-0410

Hamze Foratirad, Hamid Reza Baharvandi + Show 1 more

Open Access

https://doi.org/10.1590/1980-5373-mr-2016-0410

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Abstract

Gel-casting is an advanced colloidal processing method for fabricating ceramic green parts. In this project acrylamide-based monomers were used as a gelcasting system. The effects of tetramethylammonium hydroxide and polyethylenimine dispersants on the premix solution containing titanium carbide powder have been studied via observation of the zeta potential and rheological behavior. The effect of various parameters on the gelation time and viscosity of solution and flexural strength and the shrinkage rate of titanium carbide green body were investigated. The results presented that the order of dispersion capacity of the tetramethylammonium hydroxide dispersant was better than the polyethylenimine dispersants. The results showed that the gelation time decreased and viscosity increased with increasing the monomer content, solid loading, initiator amount and temperature. The highest bending strength (39 MPa) was obtained for the samples containing 25 wt.% monomer content and 50% solid loading.

Highlights

Titanium carbide with the excellent mechanical and thermal properties at elevated temperature has been widely used for high temperature applications[1,2,3,4,5,6]
The influences of the monomer content, monomers ratio, initiator amount, ceramic solid loading and temperature were evaluated by means of gelation time
The results showed that the increase in the monomer content, AM and MBAM concentration, initiator amount and temperature decreased the gelation time

Summary

Introduction

Titanium carbide with the excellent mechanical and thermal properties at elevated temperature has been widely used for high temperature applications[1,2,3,4,5,6] It has high modulus, hardness and strength and excellent wear and oxidation resistance. It is difficult to produce ceramic bodies with complex shapes and accurate dimensions by the conventional forming techniques For many of these applications, the gelcasting process is extensively used[7,8,9]. The gelcasting of titanium carbide is studied and optimized in terms of dispersant type, dispersant concentration, monomer content, monomer ratio, initiator and catalyst amounts, solid loading and temperature

Experimental

Result and discussion

Conclusion