Saturday, December 28, 2019

Use Of Ceramics In Filtration - 1014 Words

Highly porous ceramics (foams, honeycombs, fibres , mats, etc.) find numerous applications in various engineering fields, including filtration (molten metals, particulate from diesel exhaust gases), radiant burners, catalyst supports, biomedical devices, kiln furniture, reinforcement for metal matrix composites, bioreactors, thermal protection systems, supports for space mirrors, components in solid oxide fuel cells, lightweight sandwich structures, heat exchangers (graphite foams), etc. Talking about the interest of this report i.e. use of Ceramics in Filtration. During many industrial processes, a filtering step may be required to remove impurities and improve quality of the final product. Depending on the process, the filter may be†¦show more content†¦These inclusions can be removed by placing ceramic filters in the gating system leading to the mold. Such filters must resist attack at high temperature by a variety of molten metals. These metals can contain such reactive elements as aluminium, titanium, hafnium, and carbon. Using these filters can reduce scrap rates by 40% and increase yields by 10% for manufacturing a wide range of parts made out of iron alloys, stainless steel, super alloys, aluminium, or other nonferrous alloys. Molten metal filters generally come in two forms: a porous foam-like structure with interconnected pores that vary in direction or cross section, or an extruded porous cellular or honeycomb structure with cells of various shapes (square or triangular) and constant cross section. Though globally the most popular type of filter is foam, cellular filters are used in 75% of applications in North America. Filters can have either open cells or closed cells. Open cell (reticulate) filters consist of a network of interconnected voids surrounded by a web of ceramic and are widely used for molten metal filtration. Closed cell filters (foams) consist of a similar network but the beams are bridged by thin faces which isolate the individual cell. The open porosity in an open cell structure is critical in filter applications. The properties of a filter depend on both the cellular geometry (density, cell size) and the properties of the material.Show MoreRelatedChemical Mixture, Using Filtration And Evaporation1630 Words   |  7 Pagesthis lab will be to proficiently separate a mixture, using filtration and evaporation. In this lab, a homogeneous mixture will be created, along with a heterogeneous mixture.The two mixtures will be mixed together, yet separated. Common substances will be mixed and then separated using two of the techniques already listed; filtration and evaporation. 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