Kovar soft magnetic powder (Fe-Ni-Co Alloy)
Iron-nickel-cobalt alloys (Fe-Ni-Co), including 4J29/Kovar, are ideal for magnetic applications due to their high iron and nickel content, offering excellent soft magnetic properties and low magnetic hysteresis.
FeNiCo alloy 4J29/Kovar exhibits a matched thermal expansion coefficient (CTE) to borosilicate glass (e.g., Pyrex), making it a preferred material for glass-to-metal sealing (GTMS) in critical electronic components such as power tubes, X-ray tubes, microwave devices, and hermetic enclosures. Its thermal compatibility with hard glass ensures reliable performance in high-vacuum and high-temperature environments, making it indispensable in aerospace, semiconductor, and medical device applications.
Princeton Powder is a leading supplier of Kovar (Fe-Ni-Co) spherical powder. We specialize in a comprehensive range of spherical powder products and possess extensive expertise in additive manufacturing (3D printing) industry. ASTM F15 Kovar powder is for sale at a competitive price.
Formula | Fe-Ni-Co, Iron-Nickel-Cobalt |
Synonyms | Kovar spherical particles, Kovar spherical powders, Kovar Powder, Kovar thermal spray powder, Kovar gas atomized powder |
Appearance | Black Powder |
Particle Size | 15-45 um, 15 um-53 um, 45-105 um, can be customized upon request |
Melting Point | 2640 °C |
Density | 8.35 g/cm 3 |
Tensile Strength | 517 Mpa |
Yield Strength | 345 Mpa |
Description of Kovar (Fe-Ni-Co) Spherical Powder
Kovar (Fe-Ni-Co) spherical powder is composed of approximately 54% iron, 29% nickel, and 17% cobalt. it’s also known as ASTM F15 or Alloy 29-17 Â engineered for critical sealing, electronic, and high-temperature applications. Its precisely controlled spherical morphology ensures excellent flowability, packing density, and sintering performance, making it ideal for additive manufacturing (AM), metal injection molding (MIM), and advanced coating processes.
FeNiCo Alloy Powder 4J29 Chemical Composition
Product | Chemical Composition（wt%） | |||||
Ni | Fe | Co | Cr | Mo | C | |
Kovar (Fe-Ni-Co) | 28.5-29.5 | Bal. | 16.8-17.8 | ≤0.20 | ≤0.20 | ≤0.03 |
Si | P | S | Cu | Mn | Â | |
≤0.03 | ≤0.02 | ≤0.02 | ≤0.20 | ≤0.5 |  | |
Particle Size | 0-15μm, 15-45μm, 45-75μm, 45-150μm, or customized. | |||||
Iron-nickel-cobalt alloy (Fe-Ni-Co) powder key parameters
Matched Thermal Expansion: Ideal for sealing to borosilicate glass and ceramics
Excellent Dimensional Stability
High Vacuum Compatibility
Magnetic Properties: Useful in select electronic applications
Custom Powder Morphologies Available: Spherical for additive manufacturing, irregular for sintering
Iron-nickel-cobalt alloy (Fe-Ni-Co) powder applications
- Kovar powder for electronic packaging
- Glass-to-metal sealing Kovar powder
- Kovar powder in aerospace components
- Semiconductor packaging with Kovar powder
- Vacuum tube and RF applications
- Laser welding Kovar alloy powder
- Hermetic sealing with Kovar powder
Spherical kovar Powder Reference
Characterization of Kovar Material Produced by Powder Metallurgy
- In this study, production parameters of kovar material produced by powder metallurgy method was determined and powder metal parts were characterized. Chemical composition of the kovar material analyzed and elemental powders were stirred in three-dimensional mixer for 2 hours. The mixture powder was pressed at uni-directional press.
Equivalent materials to super alloy KOVAR are listed below: AMS 7726. AMS 7727. AMS 7728.
Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties.