white moulding Al2O3 Alumina Ceramic Sheet blank
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Alumina Ceramics:
Alumina ceramics are divided into current forms: DC anodizing, alternating current anodizing, pulse current anodizing. According to the electrolyte: sulfuric acid, oxalic acid, chromic acid, mixed acid and natural colored anode with sulfoorganic acid as the main solution. Oxidation. According to the film layer, there are: ordinary film, hard film (thick film), porcelain film, bright decoration layer, barrier layer for semiconductor action, etc. Anodizing methods and process conditions of aluminum and aluminum alloy are shown in the table. -5. Among them, the application of direct current sulfuric acid anodic oxidation method is most common. The anodized film is composed of two layers, and the porous thick outer layer is grown on a dense inner layer having dielectric properties, the latter being called Barrier layer (also called active layer). Observed by electron microscopy, the longitudinal and lateral planes of the film layer almost all show tubular holes perpendicular to the metal surface, which penetrate the outer layer of the film until the barrier layer between the oxide film and the metal interface. The barrier layer is It is composed of anhydrous alumina, which is thin and dense, has high hardness and prevents the passage of electric current. The thickness of the barrier layer is about 0.03-0.05μm, which is 0.5%-2.0% after the total film. Dense alumina Forming a honeycomb hexagonal body, called a unit cell, the entire film layer is composed of countless such unit cells. When the electrolyte is sulfuric acid, the sulfate content in the film layer is normally 13%-17%. Oxidation The porous outer layer of the membrane is mainly composed of amorphous alumina and a small amount of hydrated alumina.
properties: High hardness, high strength, wear resistance, corrosion resistance, high temperacture (1600°), good thermal diffusivity, good insulativity, low cost etc.
Data Sheet↓
Color: White/Ivory Density: 3.9g/cm3 Alumina Content: 96% 99% 99.5% Gas permeability: 0 Water Absorption: 0 MONS' Hardness: 82 Vickers Hardness (Hv50): 15.7(1600) Gpa(Kg/mm²) Flexural Strength(20°C): 330Mpa Compressive Strength(20°C): 2000Mpa Fracture Toughness (20°C): 4 MPam1/2 Thermal Conductivity(20°C): 27.5W(m.K) Thermal Expansion Coefficient: 7.6 10-6/°C Thermal Shock Resistance: 200 △T°C
Maximum use temperature 1650°C
Dielectric Strength: >10 KV/mm
Dielectric Constant: 9.1er
Dielectric Loss Angle(1MHz): 0.0002-0.0003
Volume Resistivity(20°C): >1014Ω.cm
Application industry: Machinery, electronic, chemical, petroleum etc. Specific application: Electrical ceramic substrate, plunger, sealing ring etc.
Why Choose Us? 1.12 years of professional production industrial ceramics factory 2.High quality products with low price 3.High precision parts with lowest tolerance 4.Short time for production 5.Has a group of experienced, professional and efficient R&D team 6.Has a good reputation in China and abroad. 7.MOQ is not limited, small quantity is welcome.
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