heat sink Alumina Ceramic Disc chip customized
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Alumina Ceramics:
The anodized film is composed of two layers, and the porous thick outer layer is grown on a dense inner layer having dielectric properties, and the latter is called a barrier layer (also called an active layer). Observation by an electron microscope, The longitudinal and lateral faces of the film layer almost all have tubular holes perpendicular to the metal surface, which penetrate the outer layer of the film to form a barrier layer between the oxide film and the metal interface. The barrier layer is composed of anhydrous aluminum oxide, which is thin and dense and has high The hardness and the prevention of the passage of current. The thickness of the barrier layer is about 0.03-0.05μm, which is 0.5%-2.0% after the total film. The dense alumina is surrounded by the pores to form a honeycomb hexagonal body called a unit cell. The entire film layer is composed of a myriad of such unit cells. When the electrolyte is sulfuric acid, the sulfate content in the film layer is normally 13%-17%. The porous outer layer of the oxide film is mainly amorphous. Alumina and a small amount of hydrated alumina, in addition to the cation of the electrolyte. Most of the excellent properties of the oxide film are determined by the thickness and porosity of the porous outer layer, both of which are related to the anodizing conditions. closely related.
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.
8.Vigorous team and good after-sales service
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