Comminution of silicon carbide powder in a planetary mill

Santos, Maria Aparecida Pinheiro dos; Costa, Celio A.

doi:10.1016/j.powtec.2006.07.019

Cited by 16 publications

(3 citation statements)

References 6 publications

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“…Research related to planetary mills has mainly focused on process evaluation. Computer simulations based on the discrete element method (DEM) are widely used to optimize the grinding parameters [1][2][3][4] and experimental analysis of the commercial equipment is used to validate the models [5,6], or to test performance [7][8][9]. However, there are few studies on the mechanical design of these mills.…”

Section: Introductionmentioning

confidence: 99%

Planetary Mill with Friction Wheels Transmission Aided by an Additional Degree of Freedom

et al. 2019

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Processing in planetary ball mills is well suited to a large number of applications because they are easy to operate and versatile, grinding faster than other mills. Research related to planetary mills are mainly about the process evaluation, and there are few studies on the mechanical design of such equipment. This paper describes the decision process in the design of an innovative planetary mill in which design for manufacture and assembly (DFMA) principles were used to provide compact equipment made of simple and standardized parts. We developed a friction wheel mechanism with an additional degree of freedom that improves transmission and facilitates assembly, reducing the need for adjustment. It can be applied to different equipment that relies on planetary motion or rotating devices. A prototype was built, and its grinding performance surpasses that of other types of traditional mill. The mean particle size of alumina powder was reduced from 4.2 µm to 0.9 µm in 60 minutes.

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Section: Introductionmentioning

confidence: 99%

Planetary Mill with Friction Wheels Transmission Aided by an Additional Degree of Freedom

et al. 2019

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“…Fine particles frequently flocculate to produce powdered agglomerates with sizes that are considerably larger than that of the chief particles. This conduct makes it difficult to obtain a uniformly dispersed powder mixture due to the atomic bond [17]. Concurrently, aggregate ions or homogeneities introduced at the initial step may continue in all the stages and influence the final properties of the product [6,18].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Mixing Nanomaterials with Soil

Firoozi

Taha

Khan

et al. 2019

NHC

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Mixing of nano-sized powders with soils (macro-sized powders) is a noteworthy issue for geotechnical projects. Thus, this study examined the horizontal ball mill mixing of nano-copper oxide with kaolinite. Ball milling parameters (rotation speed, weight ratio of balls to powder and milling time) of the planetary ball milling were optimized for proper mixing of nano-copper oxide and kaolinite powder. Results showed that increase in mixing time decreased the agglomeration of nano-copper powders and kaolinite and increased the homogeneity of nano-copper powder with kaolinite particles. The quality of mixing was assessed through intensity and scale of segregation using concentration data obtained through energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analyses. It was observed through these two tests that, increase in ball milling time after 6 hours resulted in grain size reduction. Field emission scanning electron microscopy analysis showed that nano-coppers were regularly found on the surface of kaolinite particles after 6 hrs. of horizontal milling at 4:1 ratio of balls to powder mixture. Furthermore, 24 hrs. mixing resulted in grinding of kaolinite particles and hence their size was reduced. Particle size analysis confirmed these results, as the highest size span value of 3.417 was observed after 6 hrs. milling with speed of 200 rpm.

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“…However, fine particles often flocculate to form powdered agglomerates (or aggregates) with size substantially larger than that of the primary particles. This behavior is the difficulty to obtain uniformly dispersed powder mixtures as a consequence of the atomic bond (Dos Santos and Costa, 2006). Simultaneously, aggregations or inhomogeneities introduced at the initial step may persist the whole stages and influence the final properties of the materials (Lange, 1989 , 1997).…”

Section: Introductionmentioning

confidence: 99%