0.05*200mm ASTM F15 Kovar Expansion Alloy Foil

• Customization: Available
• Product Type: Foil
• Material: Fe,Ni, Co
• Model NO.: 4J29
• Carbon Content: Low Carbon
• Status: Bright
• Density(g/cm3): 8.17
• Thermal Expansion Coefficient: 5.0(20~300°c)10-6/°c
• Curie Point(°c): 430
• Thermal Conductivity(W/M. °c): 20.3
• Size: Thickness:Less Than 0.05mm Width: Less Than 2
• Advantages: Small Order Accepted ,Short Delivery Time
• Application: Ignitron, Magnetron, Transistor, Sealing Plug, Rel
• Certification: ISO9001
• Chemical Composition: Ni,Co,Fe
• Transport Package: Cartons (40cm*40cm*50cm); Braided Bags, Spools
• Specification: SGS
• Trademark: Ualloy
• Origin: Zhejiang, China
• HS Code: 75052200
• Production Capacity: 500tons/Year

Product Description

1.Description:  

4J29(China); 29H, 29H-B, Techallony(Russia); Kovar, Rodar, Glasseal 29-17(United States); Nilo K, Telcaseal(Great Britain); KV-1, KV-2, KV-3(Japan); Dilver P0, Dilver P1(France); Vacon 12, Silvar 48(Germany).

4J29 expansion alloy, also known as Kovar alloy, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You'll find Kovar in applications such as power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.
 
 
 
2. Chemical composition(%)
 
 
 

Grade	C	Si	Mn	P	S	Ni	Co	Fe
4J29	0.015	0.12	0.25	0.006	0.005	29.10	17.3	Bal

 
 
 
 
3. Physical properties
 
 
 

Grade	Density(g/cm3)	Thermal expansion coefficient (10-6/°C)	Curie point(°C)	Volume resistivity(μΩ.cm)	Thermal conductivity(W/m. °C)
4J29	8.17	5.0(20~300°C) 5.2(20~450°C	430	46(20°C)	20.3

 
 
 
 
4. Mechnical properties
 
 
 

Grade		Yield Strength(Mpa)	Tensile Strength	Elongation(%)	Hardness(HV)
4J29	Temper rolled	695	780	5	230
	As annealed	315	520	24	148

 
 
 
 
 
5.Application
The alloy is widely used as glass sealing for electronic vacuum devices, such as launching tube, oscillating tube, ignitron, magnetron, transistor, sealing plug, relay, leading wire of integrated circuit, chassis, shell, scaffold and so on.
 
 
6.size


Foil:thickness:less than 0.05mm
     width: less than 200mm


 
7.Advantages
1.Pass: ISO9001 certification 
2.fine after-sale services 
3.small order accepted 
4.samples available 
5.short delivery time