Effects of Oxidation on Debinding Process for Sintered Properties of Injection Molded Copper Powders.

Ono, Katsushi; Kaneko, Yasunari; Kankawa, Yoshimitsu

doi:10.2497/jjspm.41.227

Cited by 2 publications

(2 citation statements)

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“…A reducing atmosphere not only improves the purity of final products by reducing copper oxides, but also has a positive effect on sintering, as it is known that the degree of surface oxidation can affect the sintered density of copper powders (Chan et al, 2005;Ono et al, 1994). In the authors' experimentation, the hydrogen sintering atmosphere was able to improve the purity of the final copper product, as shown in Table IV.…”

Section: Effect Of Reducing Atmosphere On Sinteringmentioning

confidence: 81%

An exploration of binder jetting of copper

Bai

Williams

2015

Rapid Prototyping Journal

215

118

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Purpose -The purpose of this paper is to explore the use of binder jetting to fabricate high-purity copper parts. The ability to fabricate geometrically complex copper shapes would have implications on the design and manufacture of components for thermal management systems and structural electronics. Design/methodology/approach -To explore the feasibility of processing copper via binder jetting, the authors followed an established material development process that encompasses powder selection and tuning process parameters in printing and thermal cycles. Specifically, the authors varied powder size and sintering cycles to explore their effects on densification. Findings -Three differently sized copper powders were successfully printed, followed by sintering in a reducing atmosphere. It was found that a 15-m-diameter powder with a sintering cycle featuring a 1,080°C maximum temperature provides the most dense (85 per cent) and pure (97 per cent) final copper parts of the parameters tested. Research limitations/implications -Due to powder-based additive manufacturing techniques' inherent limitations in powder packing and particle size diameter, there are difficulties in creating fully dense copper parts. To improve thermal, electrical and mechanical properties, future work will focus on improving densification. Originality/value -The paper demonstrates the first use of binder jetting to fabricate copper artifacts. The resulting copper parts are denser than what is typically found in binder jetting of metal powders (without infiltration); significant opportunity remains to further optimize the manufacturing process by introducing novel techniques to tailor the material properties for thermal/electrical applications.

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Section: Effect Of Reducing Atmosphere On Sinteringmentioning

confidence: 81%

An exploration of binder jetting of copper

Bai

Williams

2015

Rapid Prototyping Journal

215

118

View full text Add to dashboard Cite

show abstract

“…The relative degree of surface oxidation determines the final sintered density of copper powders. 12 In order to have a high sintered density, the oxide reduced copper powders require a proper oxide reduction treatment prior to the closure of pores during sintering. 4,5 An ideal sintering model indicated that closing of pores starts at a sintered density of about 92% theoretical, while normally pores starts to close at a sintered density of about 85% theoretical and are all closed at a sintered density of about 95% theoretical.…”

Section: Reduction Of Surface Oxides On Densificationmentioning

confidence: 99%

Injection moulding of oxide reduced copper powders

Chan¹,

Chuang²,

Lin

2005

Powder Metallurgy

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Fine oxide reduced copper powders of about 10 mm mean grain size are irregular in particle shape and high in oxygen content, which poses a difficulty in achieving good properties from injection moulding. Injection moulding was possible when a multicomponent binder with a large fraction of the backbone polymer was used. Injection moulded parts could be sintered to a density of about 95% theoretical, if reduction of the residual oxides in the powder was effectively carried out prior to closure of pores during sintering. Under such a condition, the injection moulded parts could attain an electrical conductivity higher than 80% of pure copper.

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Effects of Oxidation on Debinding Process for Sintered Properties of Injection Molded Copper Powders.

Cited by 2 publications

References 1 publication

An exploration of binder jetting of copper

An exploration of binder jetting of copper

Injection moulding of oxide reduced copper powders

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