Fabrication and properties of pressure-sintered reaction-bonded Si3N4 ceramics with addition of Eu2O3–MgO–Y2O3

Wu, Li‐Xiang; Zhu, Linlin; You, Yang; Lin, Rui-Lin; Liu, Qingqing; Guo, Wei‐Ming; Lin, Hua‐Tay; Plucknett, Kevin P.

doi:10.1016/j.ceramint.2020.08.205

Cited by 13 publications

(3 citation statements)

References 29 publications

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“…The evaluation of the shielding parameters MAC, MFP, EAN, HVL, and RPE. The linear attenuation coefficient (L) is calculated using the following equations [21,22]: Y = Y 0 e Lt . Where 't' is the glass's thickness, Y 0 and Y are the incident and transmitted photons on the glass, respectively.…”

Section: Elastic Lattice and Radiation Protection Abilitymentioning

confidence: 99%

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Ashok

Francis

Guntu³

2023

Phys. Scr.

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The goal of the ongoing research was to create resources that were mechanically durable, thermally luminous, and radiation-shielding. In this manner, we intended to synthesize lead borate glasses containing functional groups for yttrium and holmimum. Ho2O3 doped glasses, which are typically used for luminescent purposes, will also be used to investigate the thermoluminescence characteristics under gamma radiation. XRD, SEM, EDX, and DTA techniques are used to examine the samples' structure, chemical analysis, and thermal characteristics. To assess the samples' micro-hardness, the test sample's ultrasonic velocities are measured.The mass attenuation coefficient and order of radiation protection ability are shown by the radiation shielding characteristics of samples. It should be highlighted that Holmium ions alone are responsible for the shielding behaviour. The TL characteristics of the samples were examined at gamma irradiation doses of 5, 10, and 25 kGy. Irradiation increases the TL Intensities that have been observed. The findings show that Ho2O3 is the only factor contributing to the TL phenomenon, and test samples exhibit substantial TL activity. Additionally, samples were examined using the DTA technique for changes in thermal stability. Which also implies that changes in thermal stability are solely dependent on holmium concentration. Overall, the results showed that Y(20-x)Pb10B70:Hox glasses are effective TL materials and strong radiation shielding resources with low thickness values.

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Section: Elastic Lattice and Radiation Protection Abilitymentioning

confidence: 99%

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Ashok

Francis

Guntu³

2023

Phys. Scr.

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“…The densification of β‐Sialon ceramics mainly follows the transient liquid‐phase sintering mechanism. At present, the universally applied sintering additives are mainly single inorganic additives (such as MgO, Al 2 O 3 , and Y 2 O 3 ) 8–10 or composite sintering additives (such as Al 2 O 3 –Y 2 O 3 and Re 2 O 3 –MgO) 11–14 . They have the same liquid‐phase sintering mechanism: The sintering additives react with SiO 2 on the surface of the Si 3 N 4 particles to generate a low‐eutectic‐point liquid phase that wets the solid phase and thus accelerates the particle rearrangement and solid‐phase dissolution–precipitation and promotes the densification of the Sialon ceramics 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Ultrafine‐grained β‐Sialon fabricated by two‐stage sintering and study on diffusion toughening of Ti–22Al–25Nb

Cui

Guo

et al. 2023

Int J Applied Ceramic Tech

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The ultrafine-grained β-Sialon ceramics were fabricated by spark plasma sintering at different temperatures with inorganic Al 2 O 3 -Y 2 O 3 and Ti-22Al-25Nb intermetallic powder as composite additives. The research showed that β-Sialon ceramics achieve two-stage sintering densification. Al 2 O 3 -Y 2 O 3 inorganic additives promoted the synthesis and densification of β-Sialon ceramics at 1125-1215 • C. Ti-22Al-25Nb intermetallic powder diffused Ti and Nb elements at 1240-1425 • C, thereby improving the fracture toughness of β-Sialon ceramics. The maximum fracture toughness (∼9.69 MPa m 1/2 ) under 19.6 N was obtained for β-Sialon ceramics sintered at 1600 • C.

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“…studied the different effects on the nitridation of Si powders using different rare‐earth oxides and showed that Eu 2 O 3 has a great promotion effect on the nitridation of Si powders. Wu et al 49 . fabricated SRBSN with thermal conductivity of 73.6 W/(m.K) by using Eu 2 O 3 , Y 2 O 3 , and MgO as sintering additives.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity and flexural strength of sintered reaction‐bonded silicon nitride with addition of (Y_0.96Eu_0.04)₂O₃

Xia

Yao

et al. 2022

Int J Applied Ceramic Tech

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Sintered reaction‐bonded silicon nitride (SRBSN) with high thermal conductivity was obtained using (Y0.96Eu0.04)2O3 and MgO as sintering additives. Green compacts were nitrided at 1400°C for 4 h. Post‐sintering was carried out at 1850 and 1900°C for 4 h, respectively. In reaction‐bonded silicon nitride (RBSN) doped with Y2O3 and MgO, the β‐Si3N4 content and nitridation degree were 51.1% and 93.8%, respectively. However, the β‐Si3N4 content and nitridation degree were 72.6% and 96.7% in a nitrided compact doped with (Y0.96Eu0.04)2O3 and MgO. After post‐sintering, the phase composition, microstructure, mechanical properties, and thermal conductivity were investigated. After sintering at 1900°C for 4 h, the thermal conductivity of SRBSN doped with (Y0.96Eu0.04)2O3 and MgO was increased by 16.5% compared to that of the samples doped with Y2O3 and MgO. The highest hardness of 1639 HV and the good flexural strength of 776.4 MPa were also achieved in the sample doped with 2‐mol.% (Y0.96Eu0.04)2O3 and 5‐mol.% MgO.

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Fabrication and properties of pressure-sintered reaction-bonded Si3N4 ceramics with addition of Eu2O3–MgO–Y2O3

Cited by 13 publications

References 29 publications

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Ultrafine‐grained β‐Sialon fabricated by two‐stage sintering and study on diffusion toughening of Ti–22Al–25Nb

Enhanced thermal conductivity and flexural strength of sintered reaction‐bonded silicon nitride with addition of (Y_0.96Eu_0.04)₂O₃

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Fabrication and properties of pressure-sintered reaction-bonded Si3N4 ceramics with addition of Eu2O3–MgO–Y2O3

Cited by 13 publications

References 29 publications

TL defect center analysis and radiation shielding phenomenon In Ho3+: Pb(YB)2O7 composite glasses

TL defect center analysis and radiation shielding phenomenon In Ho3+: Pb(YB)2O7 composite glasses

Ultrafine‐grained β‐Sialon fabricated by two‐stage sintering and study on diffusion toughening of Ti–22Al–25Nb

Enhanced thermal conductivity and flexural strength of sintered reaction‐bonded silicon nitride with addition of (Y0.96Eu0.04)2O3

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Product

Resources

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TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

TL defect center analysis and radiation shielding phenomenon In Ho³⁺: Pb(YB)₂O₇ composite glasses

Enhanced thermal conductivity and flexural strength of sintered reaction‐bonded silicon nitride with addition of (Y_0.96Eu_0.04)₂O₃