Crystal Structure of 27R-SiAlON Synthesized Under Carbothermal Nitridation

Biswas, Mita; Sahoo, Aditi; Muraleedharan, K.; Bandyopadhyay, Siddhartha

doi:10.1080/0371750x.2020.1852972

Cited by 2 publications

(4 citation statements)

References 20 publications

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“…The dominant fracture mechanism in composite materials includes particle cracking, matrix cracking, and interface debonding. The effective fracture toughness ( ) of the ceramic composite is predicted by the effective elastic moduli ( ̅ ) and critical energy release rates ( ) of the ceramic composite based on Equations ( 14) and (15). The critical In their previous works, Doghri and Tinel [49] showed that the direct application of the Mori-Tanaka scheme for composites with dual inclusions could lead to misleading results.…”

Section: Mean-field Homogenization Using Effective Medium Theoriesmentioning

confidence: 99%

“…The dominant fracture mechanism in composite materials includes particle cracking, matrix cracking, and interface debonding. The effective fracture toughness (K IC ) of the ceramic composite is predicted by the effective elastic moduli (C e ) and critical energy release rates (J ic ) of the ceramic composite based on Equations ( 14) and (15). The critical energy release rate is predicted using the analytical model by Akhtar et al [50], which was developed based on the original model by Li and Zhou [36,37] for the prediction of fracture toughness in ceramic composites.…”

Section: Mean-field Homogenization Using Effective Medium Theoriesmentioning

confidence: 99%

“…It has a stoichiometric composition that varies from SiAlO 2 to Si 16.9 Al 22.7 O 48.8 N 11.6 . However, apart from the phases mentioned earlier, there exist other polytypes of AIN, named according to Ramsdell notation as 8H, 15R, 12H, 21R, 27R and 2H polytypes; thus, SiAlON is a versatile ceramic material with complex chemistry and a high potential for various industrial applications [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies show that the CaO additive resulted in a single-phase α-SiAlON ceramic with a relatively more stable/dense microstructure and a suitable range of thermomechanical properties compared to when the other additives were used [15]. In addition, CaO is highly soluble, cheaper, and widely available from mineral resources such as fly ash; hence, Ca-α-SiAlON is chosen for the current study.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Mean-field Homogenization Using Effective Medium Theoriesmentioning

confidence: 99%

Section: Mean-field Homogenization Using Effective Medium Theoriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Designing Semiconductors from the Assembly of Close-Packed Slabs

Jin,

Yang,

Zhang

et al. 2024

Chem. Mater.

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The crystal structures significantly affect the electrical, optical, and mechanical properties of materials, leading to exotic physical phenomena in advanced functional materials. Solid solutions are often employed for crystal manipulation with the goal of discovering new atomic structures possessing novel properties. A practical guideline for adjusting the atomic structure symmetry of different materials is highly expected for the design of functional materials. By examining the similarity of close-packed layers in inorganic materials with different functionalities, a linear dependency between structural symmetry and composition is revealed. "Layer stacking slabs" can serve as a concise and practical pathway for structural manipulation by layer-stacking-unit rearrangement, which is promising for designing materials with various crystal symmetries and characteristics. This layer-stacking-oriented structure manipulation is further confirmed by X-ray diffraction, transmission electron microscopy imaging, and synchrotron X-ray pair distribution function analysis. Following the close-packed layer spacing guidance, a new possible thermoelectric material system of (I−V−VI 2 )−(V 2 −VI 3 ) has been experimentally synthesized in this work, thereby expanding the range of thermoelectric candidates. The layer-spacing-based structural indicator exhibits the potential for accelerating the exploration of new functional materials across different application fields.

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Crystal Structure of 27R-SiAlON Synthesized Under Carbothermal Nitridation

Cited by 2 publications

References 20 publications

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

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

Designing Semiconductors from the Assembly of Close-Packed Slabs

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