Novel electrically conductive α–β SiAlON/TiCN composites

Ayas, Erhan; Kara, Alpagut

doi:10.1016/j.jeurceramsoc.2010.11.026

Cited by 26 publications

(11 citation statements)

References 46 publications

(42 reference statements)

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“…According to the achieved results, a segregated network of SiC particles along granules was formed successfully for α-β SiAlON -10 vol. % SiC, as reported segregated network concepts of α-β SiAlON-TiN and α-β SiAlON-TiCN composites [2,25]. As mentioned in the microstructural development, the formation of β-SiAlON grains with high length/width ratio around SiC particles could be accepted as a reason to break SiC segregated network dependently the growth direction of grains.…”

Section: Electrical Propertiesmentioning

confidence: 61%

Mechanical, Electrical and Thermal Properties of α/β SiAlON-SiC Composites Fabricated by Gas Pressure Sintering Method

Ayas¹

2016

ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY a - Applied Sciences and Engineering

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ABSTRACTα/β SiAlON-SiC composites were produced by coating SiAlON based spray dried granules with varying amounts of SiC (0-10 vol % SiC) following gas pressure sintering technique. A two step sintering schedule between 1940-1990°C under 10 MPa N2 gas pressure was adopted in order to achieve high densification rate. All the composites and the reference SiAlON material were densified up to 99 %. α/β SiAlON -10 vol. % SiC composite had the highest hardness value (Hv10: 16.33 GPa) due to the formation of α-SiAlON phases promoted with the increasing SiC content. No significant changes in the fracture toughness values of composites were observed. 3D segregated network of SiC particles along granules to establish electrical and thermal conductivity in the composites was successfully achieved with incorporation of 10 vol. % SiC. α/β SiAlON -10 vol. % SiC composite exhibited the semiconductor characteristic and high thermal conductivity with the electrical resistivity of 10 2 Ω.m and thermal diffusivity of ~11 mm 2 /s measured at room temperature.

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Section: Electrical Propertiesmentioning

confidence: 61%

Mechanical, Electrical and Thermal Properties of α/β SiAlON-SiC Composites Fabricated by Gas Pressure Sintering Method

Ayas¹

2016

ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY a - Applied Sciences and Engineering

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“…(b) Nitriding of TiC x : because of the approximate atomic radius of C atom and N atom, some N atoms from Si 3 N 4 come into the lattice of TiC x structure and replace a small amount of C atoms, leading to the formation of solid solution TiC 0.3 N 0.7. (c) Recrystallization of SiC: the released Si atoms from stage (a) and the replaced C atoms from stage (b) may have undergone high‐temperature bonding, eventually resulting in the minor crystalline phase of SiC …”

Section: Resultsmentioning

confidence: 99%

Temperature‐driven wear behavior of Si₃N₄‐based ceramic reinforced by in situ formed TiC_0.3N_0.7 particles

et al. 2019

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Si 3 N 4 as a structural ceramic is desirable for applications in spacecraft, transportation, and energy, but its poor high-temperature properties still do not satisfy the actual requirements. Here, a TiC 0.3 N 0.7 reinforced Si 3 N 4 ceramic is successfully designed and fabricated via the high-temperature nitridation of TiC x . It is found that TiC 0.3 N 0.7 grains with the size of 1-2 μm are uniformly dispersed in the Si 3 N 4 matrix and show a firm bond with substrate. Compared with pure Si 3 N 4 , the doping of harder TiCN phase can effectively improve ceramic's hardness and fracture toughness at a certain temperature. Importantly, the ceramic material displays extraordinary wear resistance across a wide temperature range (eg, the wear rate of TiC 0.3 N 0.7 containing Si 3 N 4 over 63 times and 178 times better than pure Si 3 N 4 at 600 and 900°C, respectively). More broadly, a correlation between wear mechanism and temperature is established, and the result shows that the mechanical strength and tribochemical oxidation as two key factors determine the wear behavior of the material. These results developed here can provide a springboard for preparation and optimization of multiphase ceramics that serve under hightemperature conditions. K E Y W O R D S high temperature, mechanical properties, nitridation, Si 3 N 4 , wear/wear resistance

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“…The powders were mixed through attrition milling with de-ionized water as liquid media and Si 3 N 4 grinding balls for 2 h in a polyamide container. The slurry was then dried in a spray drier (Nubilosa, Konstanz, Germany) to obtain spherical granules of around 100 μm in diameter, under suitable conditions [21]. SiAlON granules were incorporated with various amounts of TiN from 2.5 to 5 wt.% by mixing with ZrO 2 balls in isopropyl alcohol media for 1.5 hr at 350 rpm in a Retsch GmbH PM100 planetary ball mill (Retsch GmbH, Haan, Germany).…”

Section: Methodsmentioning

confidence: 99%

Microwave Sintering of SiAlON Ceramics with TiN Addition

et al. 2019

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α-β SiAlON/TiN composites with nominal composition of α:β = 25:75 were fabricated by microwave sintering. The effect of titanium nitride addition on the phases, microstructure, microwave absorption ability and mechanical properties (Vickers hardness and fracture toughness) of the SiAlON-based composites were studied. Finite Difference Time Domain (FDTD) software was used for the numerical simulation in order to assess the most suitable experimental setup. Sintering trials were performed in a single mode microwave furnace operating at 2.45 GHz and a power output of 660 W, for a reaction time of 30 min. SiC blocks were used as a susceptor to accelerate the microwave processing by hybrid heating, with reduced heat losses from the surface of the material of the α-β SiAlON/TiN composites. The optimum comprehensive mechanical properties, corresponding to a relative density of 96%, Vickers hardness of 12.98 ± 1.81 GPa and Vickers indentation fracture toughness of 5.52 ± 0.71 MPa.m1/2 were obtained at 850 °C when the content of TiN was 5 wt.%.

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Novel electrically conductive α–β SiAlON/TiCN composites

Cited by 26 publications

References 46 publications

Mechanical, Electrical and Thermal Properties of α/β SiAlON-SiC Composites Fabricated by Gas Pressure Sintering Method

Mechanical, Electrical and Thermal Properties of α/β SiAlON-SiC Composites Fabricated by Gas Pressure Sintering Method

Temperature‐driven wear behavior of Si₃N₄‐based ceramic reinforced by in situ formed TiC_0.3N_0.7 particles

Microwave Sintering of SiAlON Ceramics with TiN Addition

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Novel electrically conductive α–β SiAlON/TiCN composites

Cited by 26 publications

References 46 publications

Mechanical, Electrical and Thermal Properties of α/β SiAlON-SiC Composites Fabricated by Gas Pressure Sintering Method

Mechanical, Electrical and Thermal Properties of α/β SiAlON-SiC Composites Fabricated by Gas Pressure Sintering Method

Temperature‐driven wear behavior of Si3N4‐based ceramic reinforced by in situ formed TiC0.3N0.7 particles

Microwave Sintering of SiAlON Ceramics with TiN Addition

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Temperature‐driven wear behavior of Si₃N₄‐based ceramic reinforced by in situ formed TiC_0.3N_0.7 particles