Neck Formation and Self‐Adjusting Mechanism of Neck Growth of Conducting Powders in Spark Plasma Sintering

Song, Xiaoyan; Liu, Xuemei; Zhang, Jiuxing

doi:10.1111/j.1551-2916.2005.00777.x

Cited by 342 publications

(116 citation statements)

References 19 publications

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“…This effect is particularly important at the contact point between particles where the current density is concentrated, resulting in an increase in the local temperature and the enhanced diffusion. [36][37][38] In addition, the applied current can enhance sintering via non-thermal effects, such as enhanced defect mobility, point defect generation and electromigration. 39 It is worth pointing out that the improved densification behaviour of SPS over HP has also been reported for commercially pure Ti powder.…”

Section: Densification Enhancement Through Spsmentioning

confidence: 99%

Enhancement in Ti–6Al–4V sintering via nanostructured powder and spark plasma sintering

et al. 2014

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Studies are performed to enhance low temperature sintering of Ti-6Al-4V. High energy ball milling is found to be effective in lowering the sintering temperature through the mechanisms of particle size reduction and nanograin formation. The former reduces the diffusion distance for densification, whereas the latter introduces an additional densification mechanism allowing mass transport from the interior of the particle to the neck zone. Together, these two effects can reduce the onset temperature for densification by about 300uC. Spark plasma sintering can further improve low temperature sintering when compared with radiant heat sintering and microwave sintering. The enhanced densification is discussed on the basis of the applied pressure (50 MPa) and the intrinsic joule effect that leads to increase in the local temperature at the contact point between particles.

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Section: Densification Enhancement Through Spsmentioning

confidence: 99%

Enhancement in Ti–6Al–4V sintering via nanostructured powder and spark plasma sintering

et al. 2014

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“…É possível observar na amostra sinterizada em 1500 °C a presença de particulas de TiB 2 com morfologia muito próxima a sua forma original, denotando que sofreram pouca sinterização. Tal fenômeno se justifica por um baixo coeficiente de difusão do diboreto de titânio, necessitando de maior energia de ativação para atingir os estágios e fenômenos de sinterização (difusão por volume e contorno de grão) responsáveis pela densificação do sistema [12,13].…”

Section: Discussionunclassified

“…Poros com formato esférico no centro dos grãos de TiB 2 (P1) são aqueles resultantes da sinterização direta de partículas de diboreto de titânio que não chegou a eliminar completamente a porosidade. Entretanto, poros com arestas agudas (P2) são resultado da sinterização entre o TiB 2 e o AlN, a presença destes poros provavelmente é o reflexo da dificuldade do nitreto de alumínio para molhar a superfície dos grão de diboreto de titânio em algumas regiões [12].…”

Section: Discussionunclassified

Avaliação da densificação do diboreto de titânio sinterizado por plasma pulsado

et al. 2016

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RESUMOO diboreto de titânio (TiB 2 ) é um material cerâmico que se destaca por sua elevada resistência mecânica, estabilidade química e dureza a altas temperaturas, entretanto, características como baixa sinterabilidade e tenacidade a fratura limitam a atuação deste material em aplicações termomecânicas. Técnicas de sinterização não convencionais como SPS e aditivo de sinterização como AlN e Si 3 N 4 podem reduzir a temperatura de sinterização e aumentar a tenacidade à fratura do TiB 2 . Neste sentido, o presente trabalho teve como objetivo avaliar a eficiência da técnica de sinterização por plasma pulsado (Spark Plasma Sintering -SPS) no processamento do diboreto de titânio. O nitreto de alumínio foi utilizado como aditivo para reduzir temperatura e tempo de sinterização e facilitar a densificação do TiB 2 . Os resultados apontam a sinterização por plasma pulsado como uma técnica eficiente na densificação de compósito cerâmico TiB 2 -AlN. Elevado grau de densificação foi alcançado mesmo utilizando tempos de sinterização relativamente curto.Palavras-chave: Diboreto de titânio, sinterização, densificação. ABSTRACTTitanium diboride (TiB 2 ) is a ceramic material that highlight because of its high mechanical resistance, chemical stability and hardness in high temperatures. However, characteristics as low sinterability and fracture toughness restrict its usage on termomechanical applications. Non-conventional sintering techniques as SPS and sintering aid as AlN and Si 3 N 4 can reduce sintering temperature and increase fracture toughness of TiB 2 . The objective of this work is to evaluate the efficiency of spark plasma sintering (SPS) technique on the manufacturing of titanium diboride. Aluminum nitride (AlN) was used as additive to reduce sintering temperature and time and enhance tib 2 densification. The results indicate that spark plasma sintering is an efficient technique in the densification of TiB 2 -AlN ceramic composite. High degree of densification was achieved even using relatively short sintering time.Keywords: Titanium Diboride , Sintering , Densification. INTRODUÇÃOO TiB 2 é um composto refratário com propriedades atrativas, como elevada dureza (cerca de três vezes maior do que o aço endurecido) e resistência ao desgaste a temperaturas elevadas. A combinação de propriedades do TiB 2 faz deste material um candidato a aplicações diversificadas, entre elas, material estrutural para alta temperatura e revestimentos resistentes ao desgaste [1,2]. Entretanto, a densificação do TiB 2 é muito difícil e complexa, principalmente devido à elevada energia das ligações químicas entre o titânio (Ti) e o boro (B) e o seu baixo coeficiente de difusão. Assim, o transporte de massa necessário para se alcançar uma boa densificação é restrito, o que exige altas temperaturas e longos tempos de sinterização para a densificação do TiB 2 utilizando técnicas convencionais de sinterização [3]. Altas temperaturas e longos tempos de sinterização

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“…The Joule heating in the punch section of the graphite mold is produced by itself, and that of the specimen section of the SiC-ZrB 2 composite is produced by itself and spark plasma phenomena [13][14][15]. The distribution section of the current density between the graphite mold and the specimen in the simulated SiC-ZrB 2 composite was different because of differing resistances.…”

Section: Fig 2 Current Density Distributions Of the Vertical Cross mentioning

confidence: 99%

Effects of SPS Mold on the Properties of Sintered and Simulated SiC-ZrB₂Composites

Lee¹,

Kim²,

Kang³

et al. 2013

Journal of Electrical Engineering and Technology

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-Silicon carbide (SiC)-zirconium diboride (ZrB 2 ) composites were prepared by subjecting a 60:40 vol% mixture of β-SiC powder and ZrB 2 matrix to spark plasma sintering (SPS) in 15 mmΦ and 20 mmΦ molds. The 15 mmΦ and 20 mmΦ compacts were sintered for 60 sec at 1500 °C under a uniaxial pressure of 50 MPa and argon atmosphere. Similar composites were simulated using Flux ® 3D computer simulation software. The current and power densities of the specimen sections of the simulated SiC-ZrB 2 composites were higher than those of the mold sections of the 15 mmΦ and 20 mmΦ mold simulated specimens. Toward the centers of the specimen sections, the current densities in the simulated SiC-ZrB 2 composites increased. The power density patterns of the specimen sections of the simulated SiC-ZrB 2 composites were nearly identical to their current density patterns. The current densities of the 15 mmΦ mold of the simulated SiC-ZrB 2 composites were higher than those of the 20 mmΦ mold in the center of the specimen section. The volume electrical resistivity of the simulated SiC-ZrB 2 composite was about 7.72 times lower than those of the graphite mold and the punch section. The power density, 1.4604 GW/m 3 , of the 15 mmΦ mold of the simulated SiC-ZrB 2 composite was higher than that of the 20 mmΦ mold, 1.3832 GW/m 3 . The ZrB 2 distributions in the 20 mmΦ mold in the sintered SiC-ZrB 2 composites were more uniform than those of the 15 mmΦ mold on the basis of energy-dispersive spectroscopy (EDS) mapping. The volume electrical resistivity of the 20 mmΦ mold of the sintered SiC-ZrB 2 composite, 6.17 × 10 -4 Ω cm, was lower than that of the 15 mmΦ mold, 9.37 × 10 -4 Ω ·cm, at room temperature.

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Neck Formation and Self‐Adjusting Mechanism of Neck Growth of Conducting Powders in Spark Plasma Sintering

Cited by 342 publications

References 19 publications

Enhancement in Ti–6Al–4V sintering via nanostructured powder and spark plasma sintering

Enhancement in Ti–6Al–4V sintering via nanostructured powder and spark plasma sintering

Avaliação da densificação do diboreto de titânio sinterizado por plasma pulsado

Effects of SPS Mold on the Properties of Sintered and Simulated SiC-ZrB₂Composites

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Neck Formation and Self‐Adjusting Mechanism of Neck Growth of Conducting Powders in Spark Plasma Sintering

Cited by 342 publications

References 19 publications

Enhancement in Ti–6Al–4V sintering via nanostructured powder and spark plasma sintering

Enhancement in Ti–6Al–4V sintering via nanostructured powder and spark plasma sintering

Avaliação da densificação do diboreto de titânio sinterizado por plasma pulsado

Effects of SPS Mold on the Properties of Sintered and Simulated SiC-ZrB2Composites

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Effects of SPS Mold on the Properties of Sintered and Simulated SiC-ZrB₂Composites