The effect of the atmosphere and the role of pore filling on the sintering of aluminium

Schaffer, G. B.; Hall, Bruce; Bonner, Stephen; Huo, S. H.; Sercombe, T.B.

doi:10.1016/j.actamat.2005.08.032

Cited by 67 publications

(92 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nitrogen gas atmosphere seem to be suitable atmosphere during sintering as it helps during pore filling process and activate magnesium to remove oxide layer on aluminum particle. Reaction between magnesium and oxide layer was recorded with atomic absorption process by T. Pieczonka et al [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect Of SiC Particles On Sinterability Of Al-Zn-Mg-Cu P/M Alloy

Rudianto¹,

Jang²,

Yang³

et al. 2015

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Premix Al-5.5Zn-2.5Mg-0.5Cu alloy powder was analyzed as matrix in this research. Gas atomized powder Al-9Si with 20% volume fraction of SiC particles was used as reinforcement and added into the alloy with varied concentration. Mix powders were compacted by dual action press with compaction pressure of 700 MPa. High volume fraction of SiC particles gave lower green density due to resistance of SiC particles to plastic deformation during compaction process and resulted voids between particles and this might reduce sinterability of this mix powder. Sintering was carried out under ultra high purity nitrogen gas from 565• -580• C for 1 hour. High content of premix Al-5.5Zn-2.5Mg-0.5Cu alloy powder gave better sintering density and reached up to 98% relative. Void between particles, oxide layer on aluminum powder and lower wettability between matrix and reinforcement particles lead to uncompleted liquid phase sintering, and resulted on lower sintering density and mechanical properties on powder with high content of SiC particles. Mix powder with wt90% of Alumix 431D and wt10% of Al-9Si-vf20SiC powder gave higher tensile strength compare to another mix powder for 270 MPa. From chemical compositions, sintering precipitates might form after sintering such as MgZn 2 , CuAl 2 and Mg 2 Si. X-ray diffraction, DSC-TGA, and SEM were used to characterize these materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect Of SiC Particles On Sinterability Of Al-Zn-Mg-Cu P/M Alloy

Rudianto¹,

Jang²,

Yang³

et al. 2015

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…Os resultados obtidos de dureza e densificação podem ser comparados com estudos já realizados, como Pieczonka [8], Schaffer e Hall [9], Upadhyaya [10], ASM International [11] e Schaffer et al [12] que citam a melhora das propriedades mecânicas de sinterizados de alumínio sob a presença da atmosfera de nitrogênio, permitindo maior densificação das amostras, e consequentemente, melhora o processo de sinterização. De forma contrária, os mesmos autores relatam a redução nas propriedades mecânicas dos sinterizados quando tratados sob atmosfera de hidrogênio, a sua identificação.…”

Section: Discussionunclassified

Influências Das Atmosferas N2 E H2 Na Sinterização a Plasma De Alumínio Comercialmente Puro

Cardoso¹,

Zottis²,

Garcia³

et al. 2017

Tecnologia Em Metalurgia Materiais E Mineração

View full text Add to dashboard Cite

ResumoForam analisadas as influências do processo de sinterização a plasma e convencional em amostras de alumínio. No processo a plasma as atmosferas de tratamento foram o H 2 e o N 2 , e no processo convencional, o N 2 . Parâmetros de sinterização como temperatura (500°C) e tempo (60min) foram os mesmos para ambos os processos. A atmosfera de N 2 mostrou-se a ideal para a sinterização, resultando em amostras com densificação próxima de 93% e dureza entre 40 e 43HV0,05. A formação de nitretos de alumínio não foi comprovada, apesar da aparente melhora das propriedades mecânicas das amostras, como dureza. Pode-se constatar a semelhança entre os valores de densificação e microdureza com carga de 500gf, sugerindo um comportamento mecânico semelhante entre as amostras sinterizadas a plasma e convencionalmente com atmosfera de N 2 . Porém, para uma avaliação mais pontual será necessária a realização de novos experimentos com diferentes parâmetros de processo, por exemplo, tempo e temperatura de sinterização, mudança do lubrificante para auxílio na compactação e adição de elementos de liga. Palavras-chave: Metalurgia do pó; Descarga luminescente anormal; Processos de sinterização. INFLUENCES OF N 2 AND H 2 ATMOSPHERES IN PLASMA SINTERING OF COMMERCIALLY PURE ALUMINUM AbstractThis study aims to analyze the influence of plasma and conventional sintering process in aluminum compacted samples. The plasma atmospheres treatment were hydrogen and nitrogen, and for the conventional process, nitrogen. Parameters such as sintering temperature (500°C) and time (60min) were the same for both processes. The nitrogen atmosphere was the optimal for sintering, as verified by other researchers, resulting in samples with 93% densification next and hardness between 40 and 43 HV(0.05). However, the formation of aluminum nitrides was not confirmed in this study, despite the apparent improvement in mechanical properties of the samples as hardness. With the results of this study, it can be seen the similarity between the values of densification and hardness with 500gf load, suggesting a similar mechanical behavior between the sintered samples and plasma conventionally with nitrogen atmosphere. For precise assessment will be necessary to carry out new experiments with different process parameters, e.g., time and sintering temperature, the lubricant change to aid in compression, and addition of alloying elements.

show abstract

“…If the temperature rises, as a consequence of the reaction, it will increase the liquid volume, which may enhance sintering (Schaffer et al, 2006). The oxide therefore prevents suitable bonding.…”

Section: Fig 10 Oxide Layer Covering Aluminium Particlesmentioning

confidence: 99%