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4J29 Kovar Alloy Tube with Fe-Ni-Co Glass Sealed for Corrosion Resistant Applications in 4.5X1.5mm Size

Detalles del producto

Lugar de origen: Shanghái, China

Nombre de la marca: TANKII

Certificación: ISO9001

Número de modelo: FeNiCo2918

Pago y términos de envío

Cantidad de orden mínima: 5 kilos

Precio: Negociable

Detalles de empaquetado: caja de madera

Tiempo de entrega: 7-20 días

Condiciones de pago: LC, T/T, Western Union

Capacidad de la fuente: 100 toneladas por mes

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Resaltar:

Kovar alloy tube 4.5x1.5mm

,

Fe-Ni-Co glass sealed tube

,

Kovar sealing alloy precision tube

Descripción
4J29 Kovar Alloy Tube with Fe-Ni-Co Glass Sealed for Corrosion Resistant Applications in 4.5X1.5mm Size

Kovar 4J29 (Expansion alloy)
(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)

General Description
Kovar is a nominal 29%Ni-17%Co-54%Fe alloy that is a well-known glass-sealing alloy suitable for sealing to hard glasses. Kovar has a nominal expansion coefficient of approximately 5 ppm/°C and inflection temperature of ~450 °C (840 °F).

4J29 also known as Fe-Ni-Co Glass Sealing Alloy. it was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research.

Kovar (ASTM F15) has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors, and diodes. In integrated circuits, it has been used for the flat pack and the dual-in-line package.

Mainly used in electric vacuum components and emission control, shock tube, igniting tube, glass magnetron, transistors, seal plug, relay, integrated circuits lead, chassis, brackets and other housing sealing.

Chemical Domposition

alloy C Mn Si P S Ni Cr Co Cu Mo Fe
4J29 ≤0.03 ≤0.50 ≤0.30 ≤0.020 ≤0.020 28.5~29.5 ≤0.20 16.8~17.8 ≤0.2 ≤0.2 balance

Tensile Strength, MPa

Code of condition Condition Wire Strip
R Soft ≤585 ≤570
1/4I 1/4 Hard 585~725 520~630
1/2I 1/2 Hard 655~795 590~700
3/4I 3/4 Hard 725~860 600~770
I Hard ≥850 ≥700

Typical Physical properties

Density (g/cm3) 8.2
Electrical resistivity at 20ºC(OMmm2/m) 0.48
Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC 3.7~3.9
Curie point Tc/ ºC 430
Elastic Modulus, E/ Gpa 138

The heat treatment process
Annealing for stress relief Heated to 470~540ºC and hold 1~2 h. Cold down
annealing In vacuum heated to 750~900ºC
Holding time 14 min~1h.
Cooling rate No more than 10 ºC/min cooled to 200 ºC

Coefficient of expansion

θ/ºC α1/10-6ºC-1 θ/ºC α1/10-6ºC-1
20~60 7.8 20~500 6.2
20~100 6.4 20~550 7.1
20~200 5.9 20~600 7.8
20~300 5.3 20~700 9.2
20~400 5.1 20~800 10.2
20~450 5.3 20~900 11.4

Thermal conductivity

θ/ºC 100 200 300 400 500
λ/ W/(m*ºC) 20.6 21.5 22.7 23.7 25.4
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