دیرگدازها(Refractory material)

دیرگدازها(Refractory material)

اسلاید 1: Refractory material

اسلاید 2: Refractory material Properties Introduction 12342Classification Application

اسلاید 3: Introduction31History and importanceNon-metallic ceramic material or product whose chemical and physical properties allow it to be used in a high temperature environment1318 Aminabad refractory factory in Tehran with a daily capacity of 5,000 tonsAzar refractory in Isfahan with production capacity of 40,000 tons of bricks and massThe urgent need of steel industries and ... Refractories:Comparison with refractory metals:More resistance to creep, pressure, heatLow thermal conductivityLess deformationEconomic factor

اسلاید 4: 44Refractory requirementsThe general requirements of a refractoryBearing capacity against loading and abrasion forcesLow thermal expansion coefficientHeat storage capabilityAbility to withstand contact with molten metals, hot gases and erosion) and ...Ability to withstand sudden changes in temperatureHigh temperature tolerancePressure tolerance in operating conditions

اسلاید 5: Properties refractories5

اسلاید 6: Classification based on chemical composition6ABCAcidic Refractories Basic RefractoriesNeutral Refractories Stable to acids but attacked by alkalisMain components: SiO2, ZrO2Stable to alkaline but reacts with acids. Magnesia (MgO)Dolomite (MgCO3 + CaCO3) and chrome-magnesia (Cr2O3 + MgO). Stable to both acids and basesAlumina (Al2O3), chrome ( Cr2O3) and carbo