Hardness determination of bio-ceramics using Laser-Induced Breakdown Spectroscopy

Cowpe, J.S.; Moorehead, Robert; Moser, David; Astin, J.S.; Karthikeyan, Sreejith; Kilcoyne, S.H.; Crofts, Gillian; Pilkington, R.D.

doi:10.1016/j.sab.2011.03.007

Cited by 55 publications

(19 citation statements)

References 41 publications

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“…It is observed that plasma temperature and Vickers hardness (Table 5) follows the order 100 kGy < 50 kGy < 0 kGy for Sample S1 but the other samples show negligible variation in plasma temperature and Vickers hardness. In several studies, it is stated that plasma temperature is directly proportional to the hardness of the material [26]. In the present study also hardness varies as 100 kGy < 50 kGy < 0 kGy for Sample S1.…”

Section: Water Diffusion Characteristicssupporting

confidence: 57%

Understanding the performance of gamma‐ray‐irradiated epoxy nanocomposites

Mishra

Desai

Vasa

et al. 2019

Micro & Nano Letters

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Epoxy nanocomposites being used in the high-energy radiation zones as an insulant may undergo changes in their dielectric properties during service. In the present study, the performance of base epoxy resin (S1) is compared with epoxy resin with ion trapping particle (Sample S2) and epoxy resin with nanotitania (Sample S3) particle. The influence of gamma irradiation on nanocomposites was analysed. Corona inception voltage due to water droplet initiated discharge and contact angle reduces post-gamma-ray irradiation. Surface potential decay time constant reduced drastically for gamma-ray-irradiated specimens. Trap distribution characterisation indicated that charge mobility increases after irradiation. The surface roughness of the sample increases with the irradiation dosage. Dielectric relaxation spectroscopy shows that permittivity reduces and loss tangent increases with the gamma-irradiated specimens. Water diffusion rate increases for the gammaray-irradiated specimen. No change in elemental composition, measured using laser-induced breakdown spectroscopy, of test specimens was observed. The hardness of the material and plasma temperature formed during laser shine decreases with gamma-ray irradiation intensity for Sample S1, whereas samples S2 and S3 showed only marginal variation. The performance of Sample S2 is found to be better than Samples S1 and S3.

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Section: Water Diffusion Characteristicssupporting

confidence: 57%

Understanding the performance of gamma‐ray‐irradiated epoxy nanocomposites

Mishra

Desai

Vasa

et al. 2019

Micro & Nano Letters

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“…The intensity ratio calculated between the ionic line and the atomic spectral line of zirconium is found to have a direct correlation with the Vickers hardness of the specimen (Table 7). Cowpe et al in [48] observed that the plasma temperature of the bio‐ceramic sample increases with increasing hardness of the sample. Abdel‐Salam et al [49] stated that the Vickers hardness number of human teeth, shellfish, and eggshells are proportional to the intensity ratios between the ion line and the atomic line for calcium and magnesium in the plasma spectrum.…”

Section: Resultsmentioning

confidence: 99%

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

et al. 2020

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Epoxy nano-micro composite specimen prepared with micro silica and ion trapping nanoparticle, by shear mixing process, was exposed to gamma radiation and its performance for space charge and charge trap characteristics were analysed. The threshold for space charge accumulation of epoxy nanocomposites reduces and rate of space charge accumulation increases with an increase in dosage of gamma irradiation. The average growth of space charge density during poling and charge decay rate during depoling are relatively higher for gamma-irradiated specimens than the virgin specimen. The initial surface potential has a marginal reduction with increase in the dosage of gamma radiation, but the surface potential decay rate has increased significantly. Trap distribution characteristics indicate more number of shallow traps and increase in charge mobility after irradiation. The relative permittivity and loss tangent of the specimens have high impact due to gamma irradiation. The activation energy calculated from DC conductivity by Arrhenius law reduces with increment in radiation dose. Laser-induced breakdown spectroscopy reflected no change in elemental composition with gamma-irradiated specimen. The variation in plasma temperature and ion line to atomic line intensity ratio with dosage of gamma radiation have direct correlation to the Vickers hardness number of the specimens.

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“…IN has highest plasma temperature. Cowpe et al [34] explored the impact of the hardness of bio‐ceramic sample on plasma temperature and observed that the plasma temperature increases with increasing sample hardness. The outcome was additionally affirmed by the investigation led by Labutin et al in which the temperature of Li–Al alloy plasma was proportional to micro‐hardness of the alloy samples [35].…”

Section: Resultsmentioning

confidence: 99%

Understanding the performance of corona aged epoxy nano micro composites

Desai¹,

Mishra²,

Vasa³

et al. 2018

Micro & Nano Letters

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Corona ageing of the epoxy nanocomposites surface exhibits a high influence on contact angle of the material. A reduction in corona inception voltage due to water droplet, upon corona ageing, is less with epoxy composites, which has Wollastonite as filler followed with nano-micro silica filler added epoxy composites. Charge accumulation studies indicate that charge retention time drastically reduces with corona aged epoxy composite specimen. Epoxy composites with Wollastonite as filler have shown higher mean charge lifetime. Adoption of laser induced breakdown spectroscopy (LIBS) technique for characterisation of samples is unique. Measure of threshold fluence and plasma temperatures through LIBS studies enables to classify the ageing condition of the composite material. Plasma temperature and threshold fluence are clear indicators to classify different materials. Plasma temperature is also an indicator of the hardness of the material. Epoxy composite with Wollastonite as filler is not affected by laser abrasion, which is in accordance with its superior performance with corona ageing, proving as discharge resistant material.

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Hardness determination of bio-ceramics using Laser-Induced Breakdown Spectroscopy

Cited by 55 publications

References 41 publications

Understanding the performance of gamma‐ray‐irradiated epoxy nanocomposites

Understanding the performance of gamma‐ray‐irradiated epoxy nanocomposites

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

Understanding the performance of corona aged epoxy nano micro composites

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