Understanding the mechanical properties of hot pressed Ba-doped S-phase SiAlON ceramics

Basu, Bikramjit; Manisha, .; Mukhopadhyay, N. K.

doi:10.1016/j.jeurceramsoc.2008.07.005

Cited by 37 publications

(11 citation statements)

References 43 publications

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“…Figure 3 shows the variation of H V as a function of applied indentation test loads ranging from 0.245 to 9.8 N for the specimen. The variation of H V with applied indentation test load shows that the H V increases with increasing applied indentation test load, which can be considered as the reflection of the reverse indentation size effect [6][7][8]. Similar behaviour was observed in S-phase SiAlON ceramic under high load [17], TiCN cermets [7], glasses [18], and single crystals [19].…”

Section: Characterization Of the Resultant Sialonsupporting

confidence: 59%

“…The variation of H V with applied indentation test load shows that the H V increases with increasing applied indentation test load, which can be considered as the reflection of the reverse indentation size effect [6][7][8]. Similar behaviour was observed in S-phase SiAlON ceramic under high load [17], TiCN cermets [7], glasses [18], and single crystals [19]. In contrast to normal ISE, under the effect of RISE, material undergoes a relaxation, which involves a release of the indentation stress along the surface away from the indentation site, which may be because of the crack formation, dislocation activity, and/or elastic deformation of the tip of the indenter.…”

Section: Characterization Of the Resultant Sialonmentioning

confidence: 98%

“…In c type variation, hardness increases with increasing load. Load variation of this type has been observed in several studies [6][7][8]. This behaviour is called reverse indentation size effect (RISE).…”

Section: Introductionmentioning

confidence: 88%

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Vickers and Knoop Indentation Microhardness Study of β-SiAlON Ceramic

Güder

Şahin

et al. 2011

Acta Phys. Pol. A

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In this paper, analysis and interpretation of mechanical property measurements of β-SiAlON ceramic were reported. Indentation microhardness of β-SiAlON ceramic was measured using the Knoop and Vickers indenters. The analysis of the Vickers indentation microhardness data reveals the reverse indentation size effect that is the apparent microhardness increases with increasing applied indentation test load. However, the Knoop indentation microhardness data exhibit indentation size effect that is the apparent microhardness increases with decreasing applied test load. The experimental Knoop microhardness data was analyzed using Meyer's law, elastic-plastic deformation model, proportional specimen resistance model, and Hays-Kendall's model. As a result, modified proportional specimen resistance model is found to be the most effective one for the load-independent (H LI ) microhardness determination of the SiAlON ceramic. It was seen that different models used to analyze the data obtained from the Vickers indentation do not give the same intrinsic hardness value. We also present the calculation of the Young modulus, E, of the β-SiAlON ceramic.

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Section: Characterization Of the Resultant Sialonsupporting

confidence: 59%

Section: Characterization Of the Resultant Sialonmentioning

confidence: 98%

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Vickers and Knoop Indentation Microhardness Study of β-SiAlON Ceramic

Güder

Şahin

et al. 2011

Acta Phys. Pol. A

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“…This can be considered as the reflection of Reverse Indentation Size Effect (RISE) [22][23][24]. Under this condition, the material undergoes a relaxation that involves a release of the indentation stress along the surface away from the indentation size, which may be because of the crack formation, dislocation activity, and/or elastic deformation of the tip of the indenter [25].…”

Section: Figure 7:-load Vs Hv Plot Of Undoped Naap La-naap and Lt-naapmentioning

confidence: 99%

Investigations on the Effect of Amino Acid Doping on the Growth and Characterization of Alkali Metal Acid Phthalate Single Crystals.

Dhavud¹,

Prakash²

2017

IJAR

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Undoped and 0.5 mol% of L-aspartic acid (LA-C 4 H 7 NO 4 ) and L-threonine (LT-C 4 H 9 NO 3 ) doped sodium acid phthalate (NaAP) single crystals were successfully grown from aqueous solution by slow evaporation solution growth technique. Single X-ray diffraction revealed that the grown crystals possess orthorhombic crystal structure and revealed lattice distortion due to impurities. The crystallinity nature of the grown crystals was analyzed by powder X-ray diffraction analysis. Functional groups and the modes of vibrations were identified by FT-IR spectral analysis. Optical transmittance shows that L-threonine doped NaAP crystal possesses higher transparency compared to undoped NaAP and L-aspartic acid doped NaAP and the band gap energy values of the grown crystals were calculated. The photoluminescence properties of the grown crystals were investigated. The mechanical strength of the grown crystals was estimated by microhardness studies. The second harmonic generation of the grown crystals was confirmed by the Kurtz and Perry technique. Antibacterial activity of the title compounds against Streptococcus pneumoniae, Escherichia coli, and Klebsiella pneumonia strains was studied.Copy Right, IJAR, 2017,. All rights reserved. …………………………………………………………………………………………………….... Introduction:-Semiorganic crystals are a new category of materials recently examined for their fascinating properties and stable physiochemical properties, which are significant for device fabrication and applied research [1,2]. The high nonlinearity, high resistance to laser-induced damage, low angular sensitivity and better mechanical hardness of semiorganic crystals incorporate in the strong NLO properties and chemical flexibility of organic materials with the physical sturdiness and excellent transmittance of inorganic materials [3][4][5][6]. In addition, the approach of high NLO efficiency organic molecules with the favorable physical properties of the inorganic materials has been an active area of research in the last two decades.Organic material with high nonlinear optical coefficients combines with an inorganic material exhibiting excellent physical properties, giving semiorganic material. Hydrogen bonding of acid based interaction between organic cation and an inorganic anion of semiorganic give mechanical strong and thermally stable NLO crystals [7]. Highly

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“…[1][2][3][4][5] It has been widely recognized that mechanical properties of these ceramics such as hardness and fracture toughness are strongly dependent on the grain morphology. SiAlONs are a class of silicon nitride ceramics.…”

Section: Introductionmentioning

confidence: 99%