Highly dense Si3N4 crucibles used for Al casting: An investigation of the aluminum–ceramic interface at high temperatures

Santos, Claudinei dos; Ribeiro, S.; Strecker, Kurt; Rodrigues, Durval; Silva, Cosme Roberto Moreira

doi:10.1016/j.jmatprotec.2006.11.012

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…Santos et al [11] have also investigated molten metal handling properties of Si 3 N 4 ceramic crucibles and revealed that if the grain boundary glass of Si 3 N 4 ceramic crucible is crystallized by post-sintering heat treatment, chemical bond can be prevented between molten aluminium and the crucible surface. The result obtained in that work is consistent with this study in terms of the grain boundary glass removal.…”

Section: Melting Aluminiummentioning

confidence: 99%

Vacuum heat-treatment of MgO-densified silicon nitride ceramics and their compatibility with molten aluminium and copper

Demir

2011

Ceramics International

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Section: Melting Aluminiummentioning

confidence: 99%

Vacuum heat-treatment of MgO-densified silicon nitride ceramics and their compatibility with molten aluminium and copper

Demir

2011

Ceramics International

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“…However, researchers still can not break through plenty of difficulties in the manipulation of Al droplets at high temperatures 10 . Due to the strong reactivity between Al and solid substrate, the routine flowing path of metal liquid is always obstructed, when placing Al on SiC, Si 4 N 3 , and Al 2 O 3 surfaces at elevated holding temperatures [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

The Morphology of al Droplet in an Ultrasonic Oscillation Field: Kinetic and Equilibrium Thermodynamic Analysis

Liang

Yang

et al. 2023

Mat. Res.

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Wetting of metal droplet on the solid substrate is a fundamental phenomenon which is applicable to the surface chemistry. When an oscillation field is included in the wetting condition, the wetting process shows significant advancing and receding behaviors. Also, the use of ultrasonic oscillation field is promising in welding. However, some odd morphologies led by the ultrasonic-treatment have shown wetting kinetics which have not been fully investigated.The high frequency ultrasonic vibration brings hysteresis to the contact angle, whose extra energy is attributed by the oscillation field. The ultrasonic wetting process is excited by the 20 kHz frequency periodic oscillation, during which droplet is swaying cyclically. However, after capturing the transformation of droplet morphologies, it is found that the frequency of each swaying cycle is identified to be 180 ms. Theoretical investigations have also quantitively proved that the energy for the contact angle decrease origins from the ultrasonic field, and the wettability is in a great enhancement. Thermal and kinetic effects of ultrasonic are investigated by making theoretical calculations, the 20 kHz ultrasonic field lasting for 5 seconds. Thermodynamics, vibrational mechanics, and interfacial phenomena affect the sonochemistry of wetting.

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“…In general, α-Si 3 N 4 powder is preferred to β-Si 3 N 4 powder as a raw material for fabricating compacted bodies because the α-Si 3 N 4 starting powder has a higher reactivity that easily forms elongated Si 3 N 4 grain morphology, which has excellent mechanical properties [ 4 , 5 ]. Due to these appealing properties, Si 3 N 4 has been widely studied and has become the most promising structural material, especially for high temperature applications [ 6 , 7 ]. However, the high cost of fine Si 3 N 4 powders is the prime obstacle to the regular application of Si 3 N 4 -based materials.…”

Section: Introductionmentioning

confidence: 99%

Liquid-Phase-Assisted Catalytic Nitridation of Silicon and In Situ Growth of α-Si3N4

Liu

Chai

et al. 2022

Materials

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Si3N4 powders were synthesized with Fe, Co, or Ni as catalysts using Si powder at 1250 °C in a nitrogen atmosphere by liquid-phase-assisted catalytic nitridation synthesis (LPA–CNS). The catalytic effects of the metals on the nitridation of silicon powder were investigated by mixing the powder with 2 wt% by mass of Fe, Co, or Ni in a high-temperature liquid phase in flowing nitrogen. The α-Si3N4 micro-morphology could be effectively changed by adjusting the type of catalyst in the initial reaction mixtures. Fe, Co, and Ni promoted the formation of α-Si3N4 at 1250 °C and controlled the morphology of the α-Si3N4 particles. The hexagonal flakes of α-Si3N4 with a better defined morphology were obtained using Ni as the catalyst, compared to that obtained from the other two catalysts.

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Highly dense Si3N4 crucibles used for Al casting: An investigation of the aluminum–ceramic interface at high temperatures

Cited by 10 publications

References 21 publications

Vacuum heat-treatment of MgO-densified silicon nitride ceramics and their compatibility with molten aluminium and copper

Vacuum heat-treatment of MgO-densified silicon nitride ceramics and their compatibility with molten aluminium and copper

The Morphology of al Droplet in an Ultrasonic Oscillation Field: Kinetic and Equilibrium Thermodynamic Analysis

Liquid-Phase-Assisted Catalytic Nitridation of Silicon and In Situ Growth of α-Si3N4

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