Density distributions during the compaction of alumina powders: A comparison of a computational prediction with experiment

Aydın, İsmail; Briscoe, B.J.; Şanlıtürk, Kenan Y.

doi:10.1016/0927-0256(94)90153-8

Cited by 37 publications

(29 citation statements)

References 9 publications

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“…For example, Huang and Puri (2000) used density in validation of Adachi-Oka model implemented in a finite element approach (Fig. 3), Borowski (2011) Kadiri et al (2005) Michrafy et al (2002, and Sinka et al (2003) used density in validation of Drucker-Prager model solved with finite element models, and Aydin et al (1994) and Michrafy et al (2004) used density in validation of non-linear elastic problem with finite element model by successive incremental solution. In addition, Kong and Lannutti (2000) used density to validate discrete element model.…”

Section: Quality; Density and Density Distributionmentioning

confidence: 99%

Critical Review on Engineering Mechanical Quality of Green Compacts using Powder Properties

Pandeya²,

Karamchandani

et al. 2018

KONA

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For processes involving particulate materials, mechanical properties of green compacts are of great interest when they are final or intermediate products. Optimal quality of green compacts is achieved usually with empirical approaches, i.e., unexpected issues in processes or products' quality are usually mitigated by time and resource consuming trial-and-error methods. Issues of the powder compaction are commonly observed when there are problems in feed materials or operational conditions even without any substantial change in a formula. Such divergent behavior of particulate materials is especially problematic for product developments and reliable operations. It has been widely accepted hypothesis that properties of particles are determinants of mechanical behavior of powder during compaction and the quality of resulting compacts. With recent developments in nanotechnology, characterization and engineering of individual particles at a microscopic or sub-microscopic scale are now feasible. Leveraging recent technological advancements, there has been a good progress in regard to quantitative understanding of mechanical relationships between properties of particles, particle system and final product. This review highlights the recent developments and gaps in engineering mechanical quality of powder compacts in conjunction with the characterization of particle systems and compaction at multiple scales.

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Section: Quality; Density and Density Distributionmentioning

confidence: 99%

Critical Review on Engineering Mechanical Quality of Green Compacts using Powder Properties

Pandeya²,

Karamchandani

et al. 2018

KONA

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“…Frictional forces have a huge impact on the density gradient after pressing of powders spray dried and compacted to roughly half its sintered density, for instance cemented carbide powder with WC-Co and PEG (Ref [1][2][3][4]. Density gradients in powder compacts (green bodies) result in shape distortion after sintering, often resulting in expensive and time-consuming redesigns of pressing tools.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Frictional Behavior at Compaction of Powder Materials Consisting of Spray-Dried Granules

Staf

Olsson

Lindskog

et al. 2018

J. of Materi Eng and Perform

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The frictional behavior during powder compaction and ejection is studied using an instrumented die with eight radial sensors. The average friction over the total powder pillar is used to determine a local friction coefficient at each sensor. By comparing forces at compaction with forces at ejection, it can be shown that the CoulombÕs friction coefficient can be described as a function of normal pressure. Also stick phenomena has been investigated in order to assess its influence on the determination of the local friction coefficient.

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“…Em suma, a presença de umidade provoca a redução de Tg do ligante, pois as cadeias deste se tornam flexíveis em temperaturas menores [46][47][48][49][50] . [49] .…”

Section: Efeito Da Umidade Relativaunclassified

“…Os motivos que podem levar ao aumento excessivo da expansão de extração são: (a) carga aplicada para a compactação superior ao que processo necessita; (b) elevada concentração de aditivos; e (c) compactação abaixo da Tg do ligante [46,48] .…”

Section: A Etapa De Extraçãounclassified

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Estudo de variáveis no processo de compactação de pós a base de alumina

Santos¹

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Dedico este trabalho ao meu pai, Claudio, (in memóriam), à minha mãe, Julieta, aos meus avós e tios, ao Léo e à Mi. AGRADECIMENTOSAo prof. Dr. Luis Antonio Genova, meu orientador nesta dissertação, exemplo de ética profissional pelo incentivo, cuidado e paciência ao longo de todo este trabalho e, principalmente, por ter me dado a oportunidade de fazer parte de sua equipe de pesquisa.Aos meus amigos Gabriel, Júlio César e José pelo incentivo e apoio para ingressar na pós-graduação.Aos técnicos Edson e Pedro pelo apoio no laboratório.Aos colegas e amigos, Charles, Daniel Yoshikawa, Eraldo, Eliner e Denise pelo companheirismo e amizade.A Mariano Castagnet pelo auxílio quanto ao uso da máquina universal de ensaios, à escrita do texto e a construção de uma nova amizade.Aos membros da banca, pelo tempo dedicado à análise crítica desta dissertação.A profa. Dra. Ana Helena Bressiani, ao prof. Dr. Hidetoshi Takiishi, a profa. Dra. Ivana Cosentino, pelo apoio.Ao CNPq pela bolsa de estudos.A todos aqueles que, direta ou indiretamente, tenham contribuído para a realização deste trabalho.A Deus por me dar saúde para que eu pudesse desenvolver este trabalho."Seja quem você for, seja qual for a posição social que você tenha na vida, a mais alta ou a mais baixa, tenha sempre como meta muita força, muita determinação e sempre faça tudo com muito amor e fé em Deus, que um dia você chega lá. De alguma maneira você chega lá." (Ayrton Senna). O entendimento e controle dos diversos fatores que interferem neste processo são cruciais, pois grande parte dos defeitos encontrados na peça final é originada nesta etapa. Este trabalho trata da avaliação da compactação de pós a base de alumina processados em spray-dryer, com diferentes composições e contendo distintos aditivos orgânicos, sendo caracterizados em relação a ESTUDO DAS VARIAVEIS NO PROCESSO DE COMPACTAÇÃO DE PÓS

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Density distributions during the compaction of alumina powders: A comparison of a computational prediction with experiment

Cited by 37 publications

References 9 publications

Critical Review on Engineering Mechanical Quality of Green Compacts using Powder Properties

Critical Review on Engineering Mechanical Quality of Green Compacts using Powder Properties

Determination of the Frictional Behavior at Compaction of Powder Materials Consisting of Spray-Dried Granules

Estudo de variáveis no processo de compactação de pós a base de alumina

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