Alumina ceramic (Aluminum Oxide or Al2O3) is an excellent electrical insulator and one of the most widely used advanced ceramic materials. ... Alumina components are used in a wide range of applications such as electronics, pump components and automotive sensors.
What is the purpose of alumina in ceramics?
Enameling is the coating given to the surface of insulators and other ceramic materials like tiles. Alumina contributes to adherence to metal or ceramic, opacity and resistance to corrosion and to scratching in the enameling process. Enameling is also used to make decorative items.
What is the purpose of alumina in glazes?
By adding alumina as a clay (kaolin, ball clay, or fireclay) or as alumina hydrate (a white manufactured powder), the glaze can stick to the pottery's surface without coming off. Not only does alumina stiffen a glaze, but it also helps to disperse fine gas bubbles that can form in the firing process.13 nov 2019
What are the properties of alumina?
Alumina is the most well-known fine ceramic material for chemical and physical stability. Thermal properties: High heat resistance and high thermal conductivity. Mechanical properties: High strength and high hardness. Other properties: High electrical insulation, high corrosion resistance and biocompatibility.
What are the properties of Aluminium oxide?
Mechanical Properties Aluminum oxide is a very hard material, almost to the level of diamonds, so it has excellent wear resistance properties. It has high corrosion endurance and high temperature stability, low thermal expansion and a favorable stiffness-to-weight ratio.25 abr 2017
What is alumina used for?
Activated alumina is a porous, granular substance that is used as a substrate for catalysts and as an adsorbent for removing water from gases and liquids. Smelter-grade alumina accounts for 90 percent of all alumina produced; it is transported to aluminum plants, where it is electrolyzed into aluminum metal.
What is the hardness of alumina?
Property Value Units
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Hardness 82 Rockwell 45N
Tensile Strength 54 Kpsi
Modulus of Elasticity 46 psi x 106
Flexural Strength 51 kpsi
What is the thermal conductivity of alumina?
Property Minimum Value (S.I.) Maximum Value (Imp.)
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Melting Point 2277 3804.53
Minimum Service Temperature 0 -459.67
Specific Heat 451 0.739035
Thermal Conductivity 12 72.0733