Effect of cubic boron nitride grain size in the reinforcing of α-Sialon ceramics sintered via SPS

Garrett, J.C.; Sigalas, Iakovos; Wolfrum, Anne-Kathrin; Herrmann, Matthias

doi:10.1016/j.jeurceramsoc.2014.09.036

Cited by 26 publications

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References 18 publications

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“…It is desirable to obtain α-sialons with a high fracture toughness, and this has been achieved in several studies [10,11]. Various reinforcements and additives, such as cubic boron nitride (cBN) [12,13], Ca metal [14][15][16], Al metal [17], AlN [18], SiC [15] and rare-earth oxides [19][20][21], have been used to reinforce α-sialon composites with improved fracture toughness. However, to the best of our knowledge, little or no work has been reported on the influence of Ni inclusions on the behavior of α-sialons.…”

Section: Introductionmentioning

confidence: 99%

The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

et al. 2019

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This study investigates the effect of micron-sized nickel particle additions on the microstructural, thermal, and mechanical property changes of α-sialon ceramic composites. The α-sialon/Ni composites were synthesized with an increasing amount of Ni (10–40 wt.%) using the spark plasma sintering technique and nanosized alpha precursors at a relatively low synthesis temperature of 1500 °C with a holding time of 30 min in each case. The density of the samples increased with the increase in Ni content of up to 15 wt.% and, with the further increase in Ni content, it became almost constant with a slight decrease. Furthermore, thermal conductivity and thermal expansion properties of Ni-sialon composites improved slightly with the inclusion of 10 wt.% Ni. The addition of Ni to α-sialon matrix resulted in a decrease in the hardness of the composites from HV10 21.6 to HV10 16.3, however the presence of Ni as a softer interfacial phase resulted in a substantial increase in the fracture toughness of these composites. Fracture toughness was found to increase by approximately 91% at 40 wt.% Ni addition.

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Section: Introductionmentioning

confidence: 99%

The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

et al. 2019

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“…Attempts to produce highly wear-resistant c-BN-reinforced ceramic materials under low pressure based on Si 3 N 4 , sialon, Al 2 O 3 , and SiO 2 [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ] have been made. The availability of fast densification methods such as spark plasma sintering (SPS) has piqued interest in manufacturing and investigation of the properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

“…However, only a moderate increase in hardness has been achieved thus far with the addition of c-BN [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. For c-BN volume contents higher than 20 vol %, a decrease in hardness [ 12 , 15 ] and a strong increase in fracture toughness [ 11 , 12 , 13 , 14 , 16 , 17 , 18 , 19 ] have been found. This is mainly due to the weak bonding of c-BN to the ceramic matrix resulting from the formation of h-BN layers at the interface [ 12 , 13 , 14 , 16 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…For c-BN volume contents higher than 20 vol %, a decrease in hardness [ 12 , 15 ] and a strong increase in fracture toughness [ 11 , 12 , 13 , 14 , 16 , 17 , 18 , 19 ] have been found. This is mainly due to the weak bonding of c-BN to the ceramic matrix resulting from the formation of h-BN layers at the interface [ 12 , 13 , 14 , 16 , 18 ]. Formation of h-BN at the interface has not been reported for sintering temperatures below 1600 °C in other publications dealing with c-BN/Si 3 N 4 materials, probably due to the difficulties experienced in detecting these layers by X-ray diffraction (XRD) or scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

“…Based on recent TEM investigations of the c-BN–sialon interface [ 13 ] and development of special preparation methods for these materials [ 12 , 19 , 24 ], it has been shown that even following sintering at 1525 °C, by means of SPS, a hexagonal BN layer forms at the c-BN–sialon interface. The interface is composed of nanocrystalline or sub-µm h-BN particles embedded in an yttrium-rich oxynitride glassy phase [ 12 , 13 , 14 , 19 ]. A small yttria-rich layer is always found between the c-BN grains and the newly formed h-BN grains.…”

Section: Introductionmentioning

confidence: 99%

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On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials

2018

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Cubic boron nitride (c-BN) composites produced at high pressures and temperatures are widely used as cutting tool materials. The advent of new, effective pressure-assisted densification methods, such as spark plasma sintering (SPS), has stimulated attempts to produce these composites at low pressures. Under low-pressure conditions, however, transformation of c-BN to the soft hexagonal BN (h-BN) phase can occur, with a strong deterioration in hardness and wear. In the present work, the influence of secondary phases (B2O3, Si3N4, and oxide glasses) on the transformation of c-BN was studied in the temperature range between 1100 °C and 1575 °C. The different heat treated c-BN particles and c-BN composites were analyzed by SEM, X-ray diffraction, and Raman spectroscopy. The transformation mechanism was found to be kinetically controlled solution–diffusion–precipitation. Given a sufficiently low liquid phase viscosity, the transformation could be observed at temperatures as low as 1200 °C for the c-BN–glass composites. In contrast, no transformation was found at temperatures up to 1575 °C when no liquid oxide phase is present in the composite. The results were compared with previous studies concerning the c-BN stability and the c-BN phase diagram.

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Utilization of moderate pressure and elevated temperatures in the optimization of Ti₂AlC‐cBN composites using SPS technique

Rampai

Sigalas

Whitefield

2021

Int J Ceramic Engine & Sci

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MAX phases are ternary compounds with both metallic and ceramic properties. 1 Ceramic material consisting of MAX phases are relatively ductile and machinable, yet also heat-tolerant, strong and lightweight. 1,2 Among the MAX phases reported so far, aluminum containing Ti 2 AlC and Ti 3 AlC 2 , are two of the most lightweight and oxidation resistant. 2-6 These two compositions show promise for many applications especially in the field of high temperature heat resisting materials. 4 Composites of Ti 2 AlC with other ceramics, such as Ti-Al, TiC and Al 2 O 3 , have been investigated using temperature

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Effect of cubic boron nitride grain size in the reinforcing of α-Sialon ceramics sintered via SPS

Cited by 26 publications

References 18 publications

The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials

Utilization of moderate pressure and elevated temperatures in the optimization of Ti₂AlC‐cBN composites using SPS technique

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Effect of cubic boron nitride grain size in the reinforcing of α-Sialon ceramics sintered via SPS

Cited by 26 publications

References 18 publications

The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

The Property Characterization of α-Sialon/Ni Composites Synthesized by Spark Plasma Sintering

On the Stability of c-BN-Reinforcing Particles in Ceramic Matrix Materials

Utilization of moderate pressure and elevated temperatures in the optimization of Ti2AlC‐cBN composites using SPS technique

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Utilization of moderate pressure and elevated temperatures in the optimization of Ti₂AlC‐cBN composites using SPS technique