Kovar - UNS K94610
Kovar is an iron cobalt nickel alloy with a coefficient of thermal expansion like that of hard glass. Since Kovar Alloy is tough and versatile, while employing extensive quality controls throughout UNS K94610 alloy’s manufacturing process to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining are consistently achieved. Furthermore, the coefficient of thermal expansion (CTE) of Kovar is its most dynamic mechanical property.
Chemical Composition
The chemical composition of KOVAR is outlined in the following table.
Element Content (%) Nickel, Ni 29 Cobalt, Co 17 Silicon, Si 0.2 Chromium, Cr 0.2 Carbon, C 0.02 Iron, Fe Remainder Physical Properties
The physical properties of super alloy KOVAR are tabulated below.
Properties Metric Imperial Density 8.3 g/cm3 0.302 lb/in3 Melting point 1449°C 2640°F Mechanical Properties
The following table shows mechanical properties of super alloy KOVAR.
Properties Metric Imperial Tensile strength 518 MPa 75 ksi Yield strength 276 MPA 40 ksi Elongation 30% 30% Hardness, (HRB) 80 80 Other Designations
Equivalent materials to super alloy KOVAR are listed below:
- AMS 7726
- AMS 7727
- AMS 7728
- ASTM F15
- MIL I-23011 Class 1
Fabrication and Heat Treatment
Machinability
Super alloy KOVAR can be machined easily using the conventional methods.
Forming
Good ductility makes KOVAR readily formable.
Welding
Welding of super alloy KOVAR can be performed using all the traditional welding methods.
Annealing
Annealing can be performed at 788°C (2000°F) followed by air cooling. In case annealing is performed after cold working, the end product’s thermal expansion characteristics may get affected. To restore to original condition, the material has to be annealed in hydrogen atmosphere at 899°C (1650° F) for 1 h. Then the temperature has to be raised to 1099°C (2010°F) and held for 15 min followed by cooling to room temperature for less than 1 h.
Cold Working
KOVAR can be easily cold worked using conventional processes as the alloy is ductile.
UNS K94610 Kovar Specifications
Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion metal. Kovar’s chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties are consistently maintained. The Kovar manufacturing process utilizes high-end quality control aspects to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and CNC machining. Kovar Fernico alloy product specifications include:
Density: 0.302 lbs./in3
Specific Gravity: 8.36 g/cc
Curie Temperature: 435o C / 815o F
Melting Point: 1450o C / 2640o F
Specific Heat: 0.105 cal/gm/ o C at 0o C & 0.155 cal/gm/ o C at 430o C
Thermal Conductivity: 17.3 W/m ⋅ K
Electrical Resistivity: 49 microhm/cm
Kovar Applications
As direct Kovar material suppliers, Magellan Metals distributes high-grade Kovar alloy products for a wide range of industries where dimensional changes due to temperature variation must be minimized, some of the applications where UNS K94610 is utilized include:
Hermetic seals
Power tubes
Microwave tubes
Diodes
Transistors
X-ray tubes
Kovar Alloy Format Options
As an exclusive Kovar material supplier we stock this glass to metal seals alloy in a wide range of formats, including:Magellan Metals is your premiere Kovar supplier. Contact us for more information on our Kovar UNS K94610 products or request a quote today.
Bar
Wire
Sheet
Plate
Forgings
Welding Rod
Seamless Tube & Welded Tube
Kovar Alloy Product Advantages
Expansion alloy Kovar is precisely formulated and controlled to produce a coefficient of thermal expansion that is very close to that of hard glass or ceramic, meaning that it expands and contracts at a similar rate. It is therefore perfect in applications where it is used in conjunction with glass or ceramic materials, especially where a hermetic seal must be maintained across a wide temperature range. Other key Kovar benefits include:
Extremely low coefficient of thermal expansion (CTE)
Metal stamping capabilities
Advanced dimensional stability
Kovar & Coefficient of Thermal Expansion
Iron cobalt-nickel alloy Kovar is precisely formulated and controlled to produce a coefficient of thermal expansion that is very close to that of hard glass or ceramic, which means that it expands and contracts at a similar rate. This material is ideal for applications that require glass to metal seals, especially where a hermetic seal must be maintained across a wide temperature range.
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