Investigation and two-stage modeling of sintering behavior of nano/micro-bimodal powders

Oh, Joo Won; Seong, Yujin; Shin, Da Seul; Park, Seong Jin

doi:10.1016/j.powtec.2019.04.056

Cited by 31 publications

(21 citation statements)

References 42 publications

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“…However, it should be noted that the mentioned results concerned mixtures containing the same average particle size. Oh et al [32] studied the influence of using the bimodal powder mixture and revealed that the addition of nano-particles not exceeding 25 pct of the mixture volume increases the relative density. This phenomenon occurs because smaller particles fill in the gaps between irregular micro-particles.…”

Section: A Effect Of Initial Materials and Sintering Conditions On Thmentioning

confidence: 99%

The Influence of Induction Sintering on Microstructure and Deformation Behavior of Ti-5Al-5Mo-5V-3Cr Alloy

Zyguła

Wojtaszek

Śleboda

et al. 2021

Metall Mater Trans A

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The influence of the induction sintering process at different temperatures on the behavior of the powder metallurgy Ti-5Al-5Mo-5V-3Cr alloy was investigated. Material for the research was produced by elemental powder blending, followed by the uniaxial cold compacting process. Powder compacts were induction heated and sintered within the temperature range of 1000 °C to 1300 °C. The influences of process parameters on the material behavior during sintering and its properties were studied. The microstructure examination was performed with particular attention to the pore size and distribution as well as the homogenization of the microstructure. The sintering temperature of 1200 °C proved to be critical for the dissolution of most alloying powder particles. Hot compression tests were performed to determine the formability of the obtained material. Significant differences in flow stress behavior between samples sintered at temperatures below and above 1200 °C were observed. The mechanical properties of the material before and after deformation were compared. The evolution of the microstructure of sintered Ti-5Al-5Mo-5V-3Cr alloy after hot deformation was analyzed with an emphasis on its influence on the material properties. Based on the conducted research, it was found that the adequate homogenization of the chemical composition and microstructure was achieved at the temperature of 1250 °C, and a further increase did not reflect in a significant improvement.

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Section: A Effect Of Initial Materials and Sintering Conditions On Thmentioning

confidence: 99%

The Influence of Induction Sintering on Microstructure and Deformation Behavior of Ti-5Al-5Mo-5V-3Cr Alloy

Zyguła

Wojtaszek

Śleboda

et al. 2021

Metall Mater Trans A

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“…Because the small size powders are interstitial in the gap formed by the large size powders, there is a positive radius of curvature on the surface of the large one, and there is a negative radius of curvature (sintering neck) at the junction of the large and small powders. The substance can migrate and condense from the convex surface to the concave surface (sintering neck) by evaporation, so that the sintering neck is gradually filled [20][21][22]36]. Additionally, the size of small size grains are quite different from that of large ones, so that the size of large ones grows slowly, thereby balancing the contradiction between densification and grain growth.…”

Section: The Apparent Activation Energymentioning

confidence: 99%

“…Studies have shown that using the intrinsic properties of powders, such as morphology, size and so on, through the combination of powders with different sizes then co-sintering, the contradiction between densification and grain growth can be balanced [18][19][20][21][22][23][24]. Consequently, the fine-grained ceramics with high relative density can be obtained by sintering under conventional conditions [20][21][22][23][24]. For example, J W Oh et.al [21] used the Fe powders with sizes 3 μm and 100 nm to co-sintering.…”

Section: Introductionmentioning

confidence: 99%

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Densification and fine grain formation mechanisms of BaTiO3 ceramics consolidated by self-assembly sintering

Jin¹,

Zhao²,

Zhang³

et al. 2021

Preprint

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In this paper, from the perspective of thermodynamics and kinetics, we have studied the mechanism of balancing the densification and grain growth via co-sintering the micron and nano powders, also known as self-assembly sintering. In the experiment, the 200 nm and 80 nm BaTiO 3 spherical powders were used as models for combination and co-sintering. In terms of thermodynamics, the contact angle method is applied to determine the free energy of the binary particle size system. The surface free energy of 200 nm and 80 nm BaTiO 3 powders are 51.66 J/mol and 203.47 J/mol, respectively. When the powder ratio is 1:1, the surface free energy of the binary particle size system is 127.56 J/mol, which is the reason for the balance between densification and grain growth. In terms of kinetics, the Arrhenius equation was utilized to calculate the apparent activation energy ( Q ) of the binary particle size system. The results show that the value of Q is 360 kJ/mol at 1000 °C. The fine-grained ceramics with high relative density obtained by this sintering method at a low sintering temperature (1000 °C) can be explained by the relative low value of Q.

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“…However, in the case of the composite with 45 nm SiC, it is abnormal because it is expected that when the finer ceramic powder size is utilized, the density should be increased. 23,24 It seems that a growth happens in 45 nm SiC particles.…”

Section: Investigation Of the Properties Of The Samplesmentioning

confidence: 99%

A proposed model for spark plasma sintering of SiC-Si nanocomposite with different SiC particle sizes

Heydarian

Sajjadi

Johnsson

2020

Journal of Composite Materials

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In this study, the effect of SiC particle size on the sintering behavior of SiC-Si nano composites fabricated by spark plasma sintering (SPS) technique was investigated and a model was proposed, accordingly. To this purpose, SiC powders with three different particle sizes of 25 µm, 80 nm and 45 nm were chosen. It was expected that hardness of the composites increase with decreasing the SiC particle size; however, the outcomes were interesting and unpredictable. The composite with 80 nm SiC particles indicated the highest hardness. Hardness of the specimen with 25 µm SiC was low because of the large particle size of its reinforcement. While 80 and 45 nm SiC particles are considered as nano particles, the composite with 45 nm SiC particles showed lower hardness due to the growth of SiC powders during sintering according to a proposed model. Two reasons for the growth of 45 nm SiC particles were defined: (i) the fineness of the SiC particles prevented the Si particles to act as a binder between them thus, they agglomerated; (ii) SiC powders were oxidized during mixing procedure and a layer of SiO2 was formed on their surfaces. During sintering procedure, the reaction between SiC and SiO2 was happened and as a result SiO was formed. It caused vapor transportation during sintering leading to necking between particles and in turn, grain growth.

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Investigation and two-stage modeling of sintering behavior of nano/micro-bimodal powders

Cited by 31 publications

References 42 publications

The Influence of Induction Sintering on Microstructure and Deformation Behavior of Ti-5Al-5Mo-5V-3Cr Alloy

The Influence of Induction Sintering on Microstructure and Deformation Behavior of Ti-5Al-5Mo-5V-3Cr Alloy

Densification and fine grain formation mechanisms of BaTiO3 ceramics consolidated by self-assembly sintering

A proposed model for spark plasma sintering of SiC-Si nanocomposite with different SiC particle sizes

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