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Polyamide
Published in Antonio Paesano, Handbook of Sustainable Polymers for Additive Manufacturing, 2022
The particle size distribution of Rilsan® Invent PA11 and EOS PA 2200 (made of non-biobased PA 12 for PBF) are listed in Table 4.6, with the latter data set added for comparison. The quantity D10 means that, in case of Invent PA11, 10% of the powder sample has a diameter not exceeding 20.6 μm, D50 that 50% of the powder sample has a diameter not above 44.2 μm, and so on. The range of values for Invent PA11 is below 100‒150 μm, which is the thickness of the powder layers deposited during PBF. The smaller are the particles, the smoother is the surface finish of the printed part, and the longer is that part's life under fatigue loading. The powder should feature a round shape to adequately flow and generate a dense, continuous layer on the plate heated by the sintering energy source. The denser and more uniform is the layer, the better the physical and mechanical properties of the resulting part are. Figure 4.6 displays a SEM micrograph of Invent PA11 showing rough particles with sharp edges.
Preparation of a novel silica-polyvinylpyrrolidone hybrid regulator and its role in ultrafine low-rank coal flotation
Published in International Journal of Coal Preparation and Utilization, 2023
Qiuyu Lin, Yujie Mei, Changning Wu, Daofan Cao, Ke Liu
It can be seen from Fig. 9 that SiO2, PVP, and SiO2–PVP have different influences on the particle size distribution of coal kaolinite and quartz floc. Most of the particle size distribution peaks of coal floc overlap. The results indicate that the addition of the SiO2–PVP on coal flocs size regulation effect is greater than the flocculation effect on gangue minerals. From these results, the mechanism of the novel regulator can be deduced, that is, the inhibition of gangue minerals in coal by selective flocculation. The relevant particle size indicators (D10, D50, and D90) represent the maximum diameter of 10%, 50%, and 90% of the cumulative volume distribution of particles, respectively. When the coal particle size increases moderately, it is beneficial to the adhesion of coal particles and bubbles in the flotation process. Meanwhile, it is more important to selectively inhibit the flotation process of gangue mineral pairs. SiO2 has little influence on the particle size of coal, kaolinite, and quartz.
Relationship between drying and grinding parameters and physicochemical properties of Hibiscus sabdariffa calyx powders
Published in Particulate Science and Technology, 2023
Cho Urielle M’be, Joel Scher, Jeremy Petit, NG George Amani, Jennifer Burgain
Where:d10: 10% of the sample particles are smaller than this diameter,d50: 50% of the sample particles are smaller than this diameter,d90: 90% of the sample particles are smaller than this diameter.
Physical properties of mine drainage sediment according to depth in settling ponds
Published in International Journal of Mining, Reclamation and Environment, 2023
Dong-Kil Lee, Joon-Hak Lee, Young-Wook Cheong, Jongmyung Park
D10, D50, and D90 indicate the particle portions with diameters smaller than this value is 10%, 50%, and 90%, respectively. The small particle group shows that D50 is within 10 µm and D90 is below 100 µm. This is included within the particle size range of existing studies [19,22] where the main metal components are Fe and Zn. On the other hand, the large particle group shows a particle size range of 0.38–2.53 mm and D50 has a range of 0.7–1.6 mm.