Reactive Spark Plasma Sintering of Si3N4 Based Composites

Taslicukur, Zeynep; Şahin, Filiz Çinar; Goller, Gultekin; Onüralp, Yücel; Kuskonmaz, Nilgun

doi:10.4028/www.scientific.net/AST.62.185

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HomeAdvances in Science and Technology12th INTERNATIONAL CERAMICS CONGRESS PART AReactive Spark Plasma Sintering of Si3N4 Based...

Reactive Spark Plasma Sintering of Si₃N₄ Based Composites

Abstract:

Si3N4 based composites containing different amounts of SiC and SiAlON were produced by reactive spark plasma sintering of Si3N4, SiO2 and C black. Y2O3 and AlN were added as sintering additives. The SPS process was carried out at sintering temperature of 1650 0C for 5 min with uniaxial pressure of 40 MPa in a nitrogen atmosphere.The mechanic properties and morphology of Si3N4 ceramic composite were determined. Microstructures of the sintered samples were observed by SEM images and phase compositions were analysed by XRD.

Info:

Periodical:

Advances in Science and Technology (Volume 62)

Main Theme:

12th INTERNATIONAL CERAMICS CONGRESS PART A

Edited by:

Pietro VINCENZINI and Jean-François BAUMARD

Pages:

185-190

DOI:

https://doi.org/10.4028/www.scientific.net/AST.62.185

Citation:

Z. Taslicukur et al., "Reactive Spark Plasma Sintering of Si₃N₄ Based Composites", Advances in Science and Technology, Vol. 62, pp. 185-190, 2010

Online since:

October 2010

Authors:

Zeynep Taslicukur, Filiz Çinar Şahin, Gultekin Goller, Yücel Onüralp, Nilgun Kuskonmaz

Keywords:

Ceramic Composite, Mechanical Property, Microstructure, Spark Plasma Sintering (SPS)

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$41.00

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Paper TitlePages

MoSi₂ Ceramic Foam Prepared by Polymer Pyrolysis

Authors: J.W. Paek, Beom Seob Kim, Deug Joong Kim

Abstract: Ceramic foams containing MoSi2 were prepared by a self-blowing process of poly-silsesquioxane with MoSi2 as filler. Ceramic foams prepared by polymer pyrolysis were composed of MoSi2 and silicon oxycarbide glass matrix. Densities, pore sizes and mechanical properties of ceramic foams were depended on the filler content and heating rate for curing of polymer. Depending on the foaming condition, ceramic foams with a density of 1.2∼0.4 and a compressive strength of 3∼30 MPa were obtained.

129

Development of Y-TZP Pre-Sintered Blocks for CAD-CAM Machining of Dental Prostheses

Authors: Roberta M.C. Sasahara, H.N. Yoshimura, Cátia Fredericci, Alberto Calasans, Paulo Francisco Cesar, André Luiz Molisani

Abstract: The aim of this work was to establish a route to produce pre-sintered blocks of Y-TZP (yttria stabilized tetragonal zirconia polycrystal) suitable to be machined in a commercial CADCAM system, used to manufacture crowns and bridge frameworks for dental applications. Two commercial Y-TZP powders were investigated. The powders were pressed with different compaction pressures (40 to 500 MPa) and pre-sintered at temperature ranging from 900 to 1100°C. Vickers hardness, biaxial flexural strength, and linear shrinkage could be correlated to the relative density of pre-sintered samples. Using an empirical equation, pre-sintered blocks with a pre-defined density could be prepared. The blocks withstood the machining in a CAD-CAM system, and the machined and sintered crowns presented good adaptation.

712

Effect of Hydroxyapatite on Biodegradable Scaffolds Fabricated by SLS

Authors: Szilvia Eosoly, Stefan Lohfeld, Dermot Brabazon

Abstract: Selective laser sintering (SLS) has the potential to fabricate bioresorbable polymer / ceramic composite scaffolds with pre-designed external and internal architecture that can be used for bone tissue engineering applications. Scaffolds were fabricated using poly-ε-caprolactone as the base material. The effect of 15 and 30 wt% of hydroxyapatite (HA) addition was investigated in terms of compressive properties, accuracy, surface topology, and wettability. Fabricated dimensions of PCL microstructures showed great deviations from their nominal values. Average surface roughness was found to be Ra=25±4 µm. Increased HA content had no statistically significant effect on accuracy and surface roughness. However the addition of HA had a significant influence on compressive properties, hydrophobicity and wettability of the samples. Addition of 30 wt% HA improved initial compressive modulus of pure PCL scaffolds from 1.31±0.08 MPa to 1.58±0.18 MPa. Yield strength values increased from 0.14±0.07 MPa to 0.17±0.01 MPa by adding 15 wt% of HA, but decreased with further HA addition. Yield strain for all compositions was over ε=0.06. Increased HA content decreased hydrophobicity and increased wettability of scaffold surfaces. The study demonstrated the ability of SLS to fabricate tissue engineering scaffolds, and the positive effect of HA particle reinforcement in terms of compressive mechanical properties and surface characteristics

659

Thermal Shock Behavior of Calcia Stabilized Zirconia Ceramics with Porosity Gradient Structure

Authors: Qiang Shen, Chang Lian Chen, Fei Chen, Qi Wen Liu, Lian Meng Zhang

Abstract: Porous calcia stabilized zirconia ceramics (CSZC) with closed pores were presurelessly sintered by adding different contents of zirconia hollow balls. CSZC FGM with porosity gradient structure was then fabricated by laminating five layers with designed contents of zirconia hollow balls. The porosity, microstructure, and bending strength of the obtained CSZC samples were characterized. The results show that the hollow balls distribute uniformly and are well bonded with the matrix, and the porous structure is mainly composed of closed pores. The porosity of the CSZC increases linearly from 5.7 % to 31.6 % when the content of zirconia hollow balls increases from 0 % to 30 %, and the bending strength decreases rapidly from 297 MPa to 30 MPa. The thermal shock behavior of the CSZC and FGM was evaluated using air-quenching technique. It is shown that the residual bending strength of the quenched samples increases after several quenching cycles, and the samples are damaged by thermal shock after eight thermal cycles because of the production of monoclinic zirconia. FGM samples with porosity gradient structure can endure above twelve thermal shock cycles and exhibits better thermal shock resistance.

435

Bonding Strength Between Zirconia Core and Different Veneering Ceramics

Authors: Yi Wen Hu, Xin Zhang, Yin Wu, Wen Jie Si

Abstract: Zirconia ceramics are now widely used in dental restorations. The veneering porcelain chipping happens sometimes in zirconia-porcelain all-ceramic system. The objective of this study was to evaluate the bonding strength between the zirconia core and various commercial veneering ceramics. The shearing and bending methods were used to evaluate the bonding strengths of zirconia core and four veneering ceramics. Meanwhile, as surface treatment will play an important role for the bonding strength, the influence of 3 kinds of surface treatment was investigated. The results indicated that both the shearing and bonding strengths of Cercon ceram kiss is better. Moreover sand blasting is the most useful method of surface treatment.

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