Pore formation in atomized powders

Ternovoi, Yu. F.; Tsipunov, A. G.; Kuratchenko, S. B.; Kuimova, O. M.; Kondakova, K. V.

doi:10.1007/bf00792199

Cited by 11 publications

(2 citation statements)

References 1 publication

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“…Short dwell time combined with low pressure were not sufficient for complete sintering. The large single pore in the powder particle (Figure 12 (c)) results from the atomisation process [21]. By increasing the pressure to 65 MPa, higher compression occurs [22], so that the relative density rises to about 88%.…”

Section: Tnm-microstructure and Hardnessmentioning

confidence: 99%

Influence of Dwell Time and Pressure on SPS Process with Titanium Aluminides

Behrens

Brunotte

Peddinghaus

et al. 2022

Metals

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Spark plasma sintering (SPS) or the field-assisted sintering technique (FAST) is commonly used to process powders that are difficult to consolidate, more efficiently than in the conventional powder metallurgy process route. During the process, holding time and applied holding pressure influence the product’s microstructure and subsequently its properties. In this study, in addition to the temperature impact, the influence of pressure and dwell time on the consolidation behaviour of titanium aluminide (TiAl) powders during the SPS process is investigated. Commercially available pre-alloyed TiAl48-2Cr-2Nb (GE48) and TiAl44-4Nb-0.7Mo-0.1B (TNM) powders were used, which have a high application potential in, for example, the aerospace industry. The results were evaluated based on microstructural analyses, hardness measurements and relative density calculations. It was shown that the investigated parameters significantly influence the sintering results, especially in the low temperature range. Depending on the temperature field in the sample, complete sintering is not achieved if the dwell time is too short in combination with too low a pressure. Above a certain temperature, the impact of holding pressure and holding time is significantly lower.

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Section: Tnm-microstructure and Hardnessmentioning

confidence: 99%

Influence of Dwell Time and Pressure on SPS Process with Titanium Aluminides

Behrens

Brunotte

Peddinghaus

et al. 2022

Metals

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“…These pores are more often found in particles larger than 100 µm [35], whereas this is not the case in the HoAl 2 particles. According to the consideration based on fluid mechanics [36,37], the higher the atomizing gas pressure, the higher the probability of gas-trapping. Therefore, the low atomizing gas pressure is also likely to help prevent the formation of internal pores.…”

Section: Morphological and Microstructural Propertiesmentioning

confidence: 99%

Magnetocaloric particles of the Laves phase compound HoAl2 prepared by electrode induction melting gas atomization

Yamamoto,

Takeya,

Saito

et al. 2022

Preprint

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Processing magnetocaloric materials into magnetic refrigerant particles is an essential issue in developing high-performance magnetic refrigerators. Here, we succeed in stably producing magnetocaloric particles of the promising material HoAl 2 by a newly devised method based on electrode induction melting gas atomization process. The particle size range is on the order of submillimeters, which is suitable for practical refrigeration systems. The resulting particles with less contamination have good morphological, magnetic, and magnetocaloric properties: (i) almost spherical shapes with few internal pores, (ii) a sharp ferromagnetic transition around 30 K, and (iii) a large magnetocaloric effect comparable to the bulk counterpart. These features suggest the HoAl 2 gas-atomized particles have the potential of use as a magnetic refrigerant. The presented method can be applied not only to HoAl 2 but also to other brittle magnetocaloric materials with high melting points, facilitating the production of various magnetic refrigerants needed to develop magnetic refrigerators for hydrogen liquefaction.

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Microporosity of powders produced by centrifugal sputtering

Koshelev

Musienko

1991

Powder Metall Met Ceram

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Pore formation in atomized powders

Cited by 11 publications

References 1 publication

Influence of Dwell Time and Pressure on SPS Process with Titanium Aluminides

Influence of Dwell Time and Pressure on SPS Process with Titanium Aluminides

Magnetocaloric particles of the Laves phase compound HoAl2 prepared by electrode induction melting gas atomization

Microporosity of powders produced by centrifugal sputtering

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