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

Name: 4J29 Kovar Alloy Tube with Fe-Ni-Co Glass Sealed for Corrosion Resistant Applications in 4.5X1.5mm Size
Brand: Shanghai Tankii Alloy Material Co.,Ltd
SKU: FeNiCo2918
Price: 499.05 USD
Availability: InStock

Product Details

Place of Origin: Shanghai, China

Brand Name: TANKII

Certification: ISO9001

Model Number: FeNiCo2918

Payment & Shipping Terms

Minimum Order Quantity: 5 KG

Price: negotiable

Packaging Details: Wooden Case

Delivery Time: 7-20 days

Payment Terms: L/C, T/T, Western Union

Supply Ability: 100 Tons per month

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Specifications

Description

Specifications

Highlight: 
                                                                              Kovar alloy tube 4.5x1.5mm, Fe-Ni-Co glass sealed tube, Kovar sealing alloy precision tube
                                                  

Description

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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0.1mm Low Carbon Constantan Alloy with 420 Mpa Tensile Strength and High Elongation Capacity for Precision Resistance Applications

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