Si3N4/SiC nanocomposite powder from a preceramic polymeric network based on poly(methylsilane) as the SiC precursor

Gozzi, Mauricio Fernando; Radovanovic, Eduardo; Yoshida, Inez Valéria Pagotto

doi:10.1590/s1516-14392001000100004

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Experts with extensive expertise recommend utilizing a cognitive approach to melting and modeling [23][24][25][26]. Te cognitive method provides a one-of-a-kind chance to incorporate all found components and deal with them collaboratively and concurrently [27,28]. In light of the foregoing discussion, the current work's objective is to investigate the microstructural characteristics of an aluminium alloy called AA2219 that has been reinforced with varying concentrations of Si 3 N 4 (0, 3, 6, and 9) particles using the high energy stir casting method.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructural Characteristics on Wear and Corrosion Behaviour of Si3N4-Reinforced Al2219 Composites

Manjunatha¹,

Prasad²,

Hanumanthappa³

et al. 2023

Advances in Materials Science and Engineering

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The fabrication of the Al2219 + Si3N4 composites was done by means of stir casting process. The specimen was subjected to microstructural studies. The density of Si3N4 employed in the fabrication of the composites has been evaluated. Generally, the density of the composites increases as the weight percent of Si3N4 increases. TGA and DTA were performed at temperatures ranging from 30°C to 800°C, with some mass loss noted as well as the thermal stability of an AA2219 matrix improved. Under various parameters of applied load, operating duration, and speed, the wear behaviour of the produced aluminium matrix composite (AMC) was examined. Corrosion behaviour was examined using potentiodynamic polarization curve data, and it was discovered that the rate of corrosion decreases with increasing Si3N4 content, adding to the AA2219 matrix. The research work is intended to produce a totally new composite material with various compositions of reinforcement and to investigate their mechanical properties and a result of simulation.

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Section: Introductionmentioning

confidence: 99%

Influence of Microstructural Characteristics on Wear and Corrosion Behaviour of Si3N4-Reinforced Al2219 Composites

Manjunatha¹,

Prasad²,

Hanumanthappa³

et al. 2023

Advances in Materials Science and Engineering

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“…Preparation of composites has been accomplished using metalorganic precursors which decompose into amorphous powders. Compositions of the amorphous powders can be adjusted to yield the desired proportions of Si 3 N 4 and SiC in the resulting composites (Bill and Aldinger 1995;Bao and Edirisinghe 1999;Gozzi et al 2001). Nevertheless, these procedures inherit all the well known limitations of ceramic processing such as requirement of high temperatures, long sintering times, sintering additives, high pressures etc, for making Si 3 N 4 -SiC composites.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Si3N4-SiC composites by microwave route

Panneerselvam

Rao

2002

Bull Mater Sci

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Si 3 N 4-SiC composites have been microwave sintered using β β-Si 3 N 4 and β β-SiC as starting materials. Si 3 N 4 rich compositions (95 and 90 vol.% Si 3 N 4) have been sintered above 96% of theoretical density without using any sintering additives in 40 min. A monotonic decrease in relative density is observed with increase in SiC proportion in the composite. Decrease in relative density has manifested in the reduction of fracture toughness and microhardness values of the composite with increase in SiC content although the good sintering of matrix Si 3 N 4 limits the decrease of fracture toughness. Highest value of fracture toughness of 6⋅ ⋅1 MPa m 1/2 is observed in 10 vol.% SiC composite. Crack propagation appears to be transgranular in the Si 3 N 4 matrix and the toughening of the composites is through crack deflection around hard SiC particles in addition to its debonding from the matrix.

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Structural and mechanical properties of NbN and Nb-Si-N films: Experiment and molecular dynamics simulations

Pogrebnjak

Бондар

Abadias

et al. 2016

Ceramics International

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a b s t r a c tThe structural and mechanical properties of NbN and Nb-Si-N films have been investigated both experimentally and theoretically, in their as-deposited and annealed states. The films were deposited using magnetron sputtering at substrate bias (U B ) between 0 and À 70 V. While NbN films were found to crystallize in the cubic δ-NbN structure, Nb-Si-N films with Si content of 11-13 at% consisted of a twophases nanocomposite structure where δ-NbN nanocrystals were embedded in SiN x amorphous matrix.Films deposited at U B ¼0 V were highly (001)-textured. Application of substrate bias potential led to a depletion of light atoms, and caused a grain size refinement concomitantly with the increase of (111) preferred orientations in both films. The maximum hardness was 28 GPa and 32 GPa for NbN and Nb-Si-N films, respectively. NbN and Nb-Si-N films deposited at U B ¼ À70 V exhibited compressive stress of À 3 and À 4 GPa, respectively. After vacuum annealing, a decrease in the stress-free lattice parameter was observed for both films, and attributed to alteration of film composition. To obtain insights on interface properties and related mechanical and thermal stability of Nb-Si-N nanocomposite films, first principles molecular dynamics simulations of NbN/SiN x heterostructures with different structures (cubic and hexagonal) and atomic configurations were carried out. All the hexagonal heterostructures were found to be dynamically stable and weakly dependent on temperature. Calculation of the tensile strain-stress curves showed that the values of ideal tensile strength for the δ-NbN(111)-and ε-NbN(001)-based heterostructures with coherent interfaces and Si 3 N 4 -like Si 2 N 3 interfaces were the highest with values in the range 36-65 GPa, but lower than corresponding values of bulk NbN compound. This suggests that hardness enhancement is likely due to inhibition of dislocation glide at the grain boundary rather than interfacial strengthening due to Si-N chemical bonding.

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Si3N4/SiC nanocomposite powder from a preceramic polymeric network based on poly(methylsilane) as the SiC precursor

Cited by 6 publications

References 30 publications

Influence of Microstructural Characteristics on Wear and Corrosion Behaviour of Si3N4-Reinforced Al2219 Composites

Influence of Microstructural Characteristics on Wear and Corrosion Behaviour of Si3N4-Reinforced Al2219 Composites

Preparation of Si3N4-SiC composites by microwave route

Structural and mechanical properties of NbN and Nb-Si-N films: Experiment and molecular dynamics simulations

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