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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2014

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Sonic characterization of porous Si3N4 produced by various pore formers

Topateş G., Eren Gültekin E.

Journal of Achievements in Materials and Manufacturing Engineering

2014

Vol. 63, nr 1

13--18

Purpose: Study aims to investigate the elastic properties of porous Si3N4 thus three different starch type as pore former additives were used to obtain different pore characteristics. Design/methodology/approach: Porous Si3N4 ceramics were fabricated by partial sintering and pore former addition. Pore formers consisted of elliptic, round and angular particles were used. Elastic, shear and bulk moduli of the samples were measured by ultrasonic measurement using ultrasonic A-scan. Findings: Starches whose particles are isometric and angular lead to higher elastic properties thus it’s possible to tailor the elastic properties by using pore formers with different morphologies. Starches whose particles are isometric and angular lead to higher elastic properties thus it’s possible to tailor the elastic properties by using pore formers with different morphologies Research limitations/implications: The porosity of fabricated ceramics varied between 50-70% and pore size were restricted to around 1 μm as a result of a small grain width of beta-Si3N4 grains and interlocking structure formed by these grains. Practical implications: The Young’s (elastic) modulus of sample without pore former was 30 and it decreased to 10-17 GPa by using different pore formers. Same trend also observed for shear modulus. Originality/value: Even though using similar size and same amount of pore former, slight differences were observed as a result of different geometry of pore former particles and hence pore geometry.