Kovar (ASTM F15) is a specialized nickel-cobalt ferrous alloy composed of 29% Nickel, 17% Cobalt, and 54% Iron. Renowned for its controlled low thermal expansion (CTE), Kovar is the industry standard for applications requiring seamless compatibility with hard glass and ceramics.

Material Properties of Superalloy

Alloy Properties

Low CTE

Closely matches that of glass and ceramics, minimizing thermal stress in sealing applications.

Mechanical Strength

Offers good tensile and yield strength, providing stability and durability under mechanical stress.

Magnetic Properties

It can be magnetized. This is important in applications that require the alloy to interact with magnetic fields.

Weldability

Can be effectively welded to many materials, allowing for versatile assembly in electronic packaging.


Industrial Applications of Kovar (ASTM F15) Alloy

Across the Aerospace, Telecommunications, and Defense sectors, Kovar is indispensable. Its unique combination of dimensional stability and magnetic shielding makes it a versatile solution for sensitive electronic housings and vacuum components. PremFixer’s expert Kovar CNC machining ensures that these properties are preserved, providing you with high-strength, weldable parts that perform flawlessly under extreme thermal stress.

Alloy Applications
Electronic Packaging

Electronic Packaging

Used for glass-to-metal seals in vacuum tubes, transistors, and semiconductor packages.

Aerospace

Aerospace

Utilized in sealing components and housings for satellites and spacecraft.

Sensors and Actuators

Sensors and Actuators

Used in precision sensors and actuator components requiring stability and accuracy.

Telecommunications

Telecommunications

Applied in high-performance electronics, including RF and microwave component packaging.

Medical Devices

Medical Devices

Employed in implants and surgical instruments due to its biocompatibility.

Optoelectronics

Optoelectronics

Commonly used for packaging laser diodes and LED components to ensure thermal stability.


What’s the Challenges in Kovar CNC Machining?

Kovar alloy is a cornerstone of modern engineering due to its controlled thermal expansion and superior dimensional stability. At PremFixer, we leverage Kovar’s excellent weldability and high mechanical strength to manufacture components for the most demanding environments. From precision magnetic shielding to high-vacuum hardware, our Kovar CNC machining services provide the reliability required for mission-critical industrial applications.”

Kovar Machining Key Considerations | PremFixer CNC Specialist
Key Consideration
Description
Thermal Management
Kovar’s low thermal conductivity can cause rapid heat buildup at the cutting edge. PremFixer utilizes high-pressure coolants and optimized spindle speeds to prevent thermal distortion and protect the material’s specific mechanical properties.
Strain Hardening
Due to its nickel-cobalt composition, Kovar (ASTM F15) is prone to work hardening. Our CNC experts utilize specialized carbide tooling and consistent feed rates to maintain a sharp cut, preventing glazed surfaces and excessive tool wear.
Precision Tolerance
Achieving sub-micron accuracy is vital for hermetic glass-to-metal sealing. We closely monitor geometric tolerances and surface finish parameters to ensure every machined component meets rigorous aerospace and vacuum industry standards.
Cost Optimization
As a premium material, Kovar machining requires efficient stock management. PremFixer’s advanced CAM programming minimizes raw material waste, providing cost-effective production for both custom prototypes and high-volume industrial runs.
Stress-Relief Annealing
Post-machining heat treatments are often essential to relieve internal stresses. We offer integrated workflows for decarburization and annealing to stabilize the alloy’s structure, ensuring the highest reliability for vacuum-tight applications.


Get Your Custom Kovar Alloy Parts Today!

Contact us today for a free quote or to discuss your project. Let’s work together to make your metal parts precise, durable, and cost-effective.