Sialon from synthesis to applications: an overview

El‐Amir, Ahmed A. M.; El-Maddah, A. A.; Ewais, Emad M.M.; El‐Sheikh, Said M.; Bayoumi, Ibrahim M.I.; Ahmed, Y. M. Z.

doi:10.1080/21870764.2021.1987613

Cited by 21 publications

(5 citation statements)

References 215 publications

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“…The low temperature

-phase has a high fracture toughness but low thermal shock resistance and relatively low hardness. The high-temperature

-phase has a good wear resistance and hardness but a low fracture toughness [ 4 ]. In a recent laser ablation study using a

laser at 2 kW with a focal diameter of 0.3 mm it is found that the surface is free from large sized cracks and voids despite some small and few localized micro-cracks [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

et al. 2023

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Silicon alumina nitride (SiAlON) and alumina toughened zirconia (ATZ) ceramics are applied for ceramic cutting tools to machine, e.g., cast iron, nickel base alloys and other difficult-to-machine materials. The state of the art technology for manufacturing of the cutting tool geometry is grinding. Laser processing of ceramics is already studied in terms of ablation rate and roughness evaluation with the application of dental implant manufacturing. In the present study, laser machining of the mentioned ceramics is explored with a laser beam source of 1064 nm wavelength and 10 ps pulse duration (FWHM). The angle dependent energy specific removal rate is described in a model and the optimal pulse fluence for the different materials and the irradiation angles can be derived. For processing at irradiation angle of up to 75° no decrease of the relative absorption could be observed. For ATZ, lowest surface roughness is determined for both, orthogonal and quasi-tangential processing angle. For SiAlON, the roughness decreases constantly for higher tilt angles. A significant difference in the material answer with change of the sample composition can be detected and the results show the potential of further developing SiAlON ceramics towards machineability for laser ablation.

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“…The low temperature

-phase has a high fracture toughness but low thermal shock resistance and relatively low hardness. The high-temperature

-phase has a good wear resistance and hardness but a low fracture toughness [ 4 ]. In a recent laser ablation study using a

laser at 2 kW with a focal diameter of 0.3 mm it is found that the surface is free from large sized cracks and voids despite some small and few localized micro-cracks [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

et al. 2023

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“…Sialon belongs to the solid solutions of Al and O atoms in the crystal lattice of Si 3 N 4 [20,21], and it has gained much attention due to its high flexural strength (350~1100 MPa) [22], low thermal expansion (3.7~4.5 × 10 −6 / • C) [23], and excellent resistance to oxidation and corrosion [24][25][26]. Two types of polymorphs of Sialon, αand β-phases, were widely researched.…”

Section: Introductionmentioning

confidence: 99%

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Dong

Xing

et al. 2023

Materials

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The in situ Mg-sialon in low-carbon MgO-C refractories was studied with respect to its oxidation behavior and mechanism at 1500 °C. The results indicated that the oxidation index and rate constant of low-carbon MgO-C refractories with Mg-sialon were 26.2% and 0.51 × 10−3 cm2/min at 1500 °C for 2 h, respectively. The formation of a dense MgO-Mg2SiO4-MgAl2O4 protective layer contributed to considerable oxidation resistance, and the generation of this thicker layer was due to the combined volume effect of Mg2SiO4 and MgAl2O4. The reduced porosity and more complex pore structure were also found in the refractories with Mg-sialon. Therefore, further oxidation was restricted as the oxygen diffusion path was effectively blocked. This work proves the potential application of Mg-sialon in improving the oxidation resistance of low-carbon MgO-C refractories.

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“…SiAlON is thus formed from the chemical reaction Nanomaterials 2022, 12, 2176 2 of 24 involving silicon nitride (Si 3 N 4 ), aluminum oxide (Al 2 O 3 ), and aluminum nitride (AlN), in which the Al-N and Al-O bonds replace some of the Si-N bonds [5]. SiAlON primarily exists in four representative phases or combinations, i.e., β-SiAlON, α-SiAlON, O-SiAlON, and X-SiAlON [6,7]. β-SiAlON is the low-temperature phase commonly represented as Si 6−z Al z O z N 8−z , where z is the number of Si and N atoms that are replaced by the Al and O atoms; the z value ranges between 0 to 4.2 [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Material-by-Design Approach to Develop Ceramic- and Metallic-Particle-Reinforced Ca-α-SiAlON Composites for Improved Thermal and Structural Properties

2022

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α-SiAlON is commonly used to machine superalloys owing to its desirable thermal and structural properties. α-SiAlON is among the crystalline forms of SiAlON and has more favorable properties than β-SiAlON. However, it becomes fragile during the machining of hard-to-cut materials due to its low fracture toughness and machinability. Recent research efforts focus on improving the thermal and structural properties of α-SiAlON using suitable dopants, nano-sized precursors, and the addition of metallic/ceramic reinforcement particles. The present study presents a material-by-design approach to designing and developing ceramic and metal-particle-reinforced Ca-α-SiAlON composites with properties tailored for the cutting tool applications. The mean-field homogenization theories and effective medium approximations implemented in an in-house code are used to effectively optimize the thermal and structural properties of the Ca-α-SiAlON composite by varying essential parameters such as inclusion material, volume fraction, porosity, particulate size, and thermal interface resistance. Individual properties of the matrix and reinforcements are considered in the computations of effective properties such as thermal conductivity, thermal expansion coefficient, modulus of elasticity, and fracture toughness. The main objective of the study is to enhance the thermal conductivity and fracture toughness of Ca-α-SiAlON, while lowering its thermal expansion coefficient. At the same time, the elastic modulus and hardness/strength must be maintained within an acceptable range. As a validation, Ni/Ca-α-SiAlON and SiC/Ca-α-SiAlON composites are synthesized from the nano-sized precursors, CaO dopant, and Ni/SiC microparticles via spark plasma sintering (SPS) process. The thermal conductivity, coefficient of thermal expansion, and elastic modulus of the composites are measured and compared with the computational predictions. The computational predictions are found to be comparable to that of the experimental measurements. Moreover, the studies show that WC, SiC, and Cr can be suitable reinforcement materials for enhancing the thermal and structural properties of Ca-α-SiAlON material for the cutting tool inserts.

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Sialon from synthesis to applications: an overview

Cited by 21 publications

References 215 publications

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

Laser Ablation Study of Cutting Ceramics with Consideration of the Beam Inclination Angle

Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

A Material-by-Design Approach to Develop Ceramic- and Metallic-Particle-Reinforced Ca-α-SiAlON Composites for Improved Thermal and Structural Properties

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