China National Standard GB/T1804

China National Standard GB/T1804 "General tolerances Tolerances for linear and angular dimensions without individual tolerance indications" GB/T1804 is equivalent to the international standard ISO 2768-1: 1989 "General tolerances - Part 1: Tolerance of linear and angular dimensions without tolerances" in the tolerance part of the linear dimension of the tolerance. GB/T1804 specifies the general tolerance …

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The properties of alumina ceramics and steatite ceramics as insulating material

The properties of alumina ceramics and steatite ceramics as insulating material Alumina ceramics 75 Main chemical composition: ~75% Al2O3 Density (g/cm3): 2.5~3.3 Tensile strength (MPa): 200~300 Thermal expansion coefficient (X10^(-6)/°C): 6 Thermal conductivity (W/m.K):/ Volume resistivity (Ω.cm): 10^13 ~ 10^14 Dielectric constant (1MHz): 7.5~9.0 Dielectric loss (1MHz):/ Insulation strength (kV/mm): 20~35 Alumina ceramics 95 Main …

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Propiedades y aplicaciones de cerámica de alúmina con diferentes contenidos de alúmina para electrónica

Propiedades y aplicaciones de cerámica de alúmina con diferentes contenidos de alúmina para electrónica Alúmina 99.9 Contenido de Al2O3 (%): 99.9 Resistencia a la compresión (MPa, 25 ℃): 2000 Resistencia a la tracción (MPa, 25 ℃): / Constante dieléctrica (1MC, 25 ℃) F / m: 9.9 Pérdida dieléctrica (1MC, 25 ℃): 1x10 ^ (- 4) …

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Properties and applications of alumina ceramics with different alumina content for electronics

Properties and applications of alumina ceramics with different alumina content for electronics Alumina 99.9 Al2O3 content(%): 99.9 Compressive strength ( MPa, 25℃):2000 Tensile strength (MPa, 25℃):/ Dielectric constant (1MC,25℃)F/m:9.9 Dielectric loss (1MC,25℃): 1x10^(-4) Max. Linear expansion coefficient (25~700℃) X10^(-6)/℃:8.0 Softening temperature (℃):1600 Min. Sintering temperature (℃): 1800~1900 Applications:High-pressure sodium lamp translucent arc tube shell, translucent …

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Requisitos sobre el rendimiento de cerámicas aislantes modernas

El rendimiento de las cerámicas aislantes modernas debe cumplir los siguientes requisitos: 1. La constante dieléctrica que puede cumplir los requisitos técnicos; 2. La menor pérdida dieléctrica posible; 3. Resistencia de alto volumen y fuerza eléctrica; 4. Buena temperatura dieléctrica y características de frecuencia; 5. Excelente conductividad térmica, resistencia mecánica, resistencia a la fractura, estabilidad …

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Requirements on performance of modern insulating ceramics

The performance of modern insulating ceramics should meet the following requirements: 1. The dielectric constant that can meet the technical requirements; 2. The lowest possible dielectric loss; 3. High volume resistivity and electrical strength; 4. Good dielectric temperature and frequency characteristics; 5. Excellent thermal conductivity, mechanical strength, fracture toughness, chemical stability and thermal stability. Typical …

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ISO 19652:2018

ISO 19652:2018 Fine ceramics (advanced ceramics, advanced technical ceramics) -- Test method for complete decomposition performance of semiconducting photocatalytic materials under indoor lighting environment -- Decomposition of acetaldehyde. ISO 19652:2018 specifies a test method for the determination of complete decomposition performance of indoor light-active photocatalytic materials under an indoor lighting environment using acetaldehyde. In this …

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