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Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod

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Busco por tiempo largo de la placa del nicrom, y con éxito comprado le del material de Ohmalloy. OHMALLOY proporcionan buen servicio real en servicio de la aleación y pueden ayudarme siempre en encontrar la aleación correcta de la resistencia.

—— Arnés de Mike

OHMALLOY puede provie yo solamente el alambre 1.0m m con breve periodo de tiempo, de que de la aleación de 1kg Kovar es realmente asombroso. Gracias

—— Janey

Realmente profesional en el alambre y el cable, qué del termopar quiero apenas puede conseguir de OHMALLOY

—— Chris

El Constantan esmaltado 0.08m m, nunca espero conseguir solamente 2kg de él. Pero fuente de OHMALLOY él a mí con buena calidad. ¡Dios Jesús! Un proveedor tan confiable de China

—— Aaron

Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod

Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod
Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod

Ampliación de imagen :  Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod Mejor precio

Datos del producto:
Lugar de origen: China (Shangai)
Nombre de la marca: OHMALLOY
Certificación: ISO
Número de modelo: 4J29
Pago y Envío Términos:
Cantidad de orden mínima: 20 KG
Precio: negotiable
Detalles de empaquetado: con la caja de madera
Capacidad de la fuente: 5000kg/month
Descripción detallada del producto
Materiales: 4J29 Tipo de suministro: barra
color: color primario superficie: brillante y liso
Alta luz:

aleación kovar

,

invar de la extensión termal

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

OhmAlloy-4J29 also known as Kovar 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. Most metals cannot seal to glass because their coefficient of thermal expansion is not the same as glass, so as the joint cools after fabrication the stresses due to the differential expansion rates of the glass and metal cause the joint to crack.

 

Kovar is a nickel–cobalt ferrous alloy compositionally identical to Fernico, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10−6 /K between 30 and 200 °C, to ~10 × 10−6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.

The name Kovar is often used as a general term for Fe–Ni alloys with these particular thermal expansion properties. Note the related particular Fe–Ni alloy Invar which exhibits minimum thermal expansion.

 

OhmAlloy-4J29was 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. Most metals cannot seal to glass because their coefficient of thermal expansion is not the same as glass, so as the joint cools after fabrication the stresses due to the differential expansion rates of the glass and metal cause the joint to crack.

 

OhmAlloy-4J29 not only has thermal expansion similar to glass, but its nonlinear thermal expansion curve can often be made to match a glass, thus allowing the joint to tolerate a wide temperature range. Chemically, it bonds to glass via the intermediate oxide layer of nickel oxide and cobalt oxide; the proportion of iron oxide is low due to its reduction with cobalt. The bond strength is highly dependent on the oxide layer thickness and character. The presence of cobalt makes the oxide layer easier to melt and dissolve in the molten glass. A grey, grey-blue or grey-brown color indicates a good seal. A metallic color indicates lack of oxide, while black color indicates overly oxidized metal, in both cases leading to a weak joint.

 

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.

 

 

Normal composition%

Ni 28.5~29.5 Fe Bal. Co 16.8~17.8 Si ≤0.3
Mo ≤0.2 Cu ≤0.2 Cr ≤0.2 Mn ≤0.5
C ≤0.03 P ≤0.02 S ≤0.02    

 

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 20℃(Ωmm2/m) 0.48
Temperature factor of resistivity(20℃~100℃)X10-5/℃ 3.7~3.9
Curie point Tc/ ℃ 430
Elastic Modulus, E/ Gpa 138

 

 

 

 

Coefficient of expansion

θ/℃ α1/10-6-1 θ/℃ α1/10-6-1
20~60 7.8 20~500 6.2
20~100 6.4 20~550 7.1

 

 

Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod 0                                                                                                                           

Customized 4J29 Kovar Alloy Sealing Machine / Electronic Devices Kovar Rod 1

 

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Persona de Contacto: Mr. Qiu

Teléfono: +8613795230939

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