Description of Kovar Seamless Pipe
Kovar seamless pipe is an alloy tubing made of iron, nickel, and cobalt. Its characteristics include a low thermal expansion coefficient that is close to those of ceramics or glass. This property is particularly useful for applications requiring materials that maintain stability and sealability during temperature fluctuations. Additionally, it boasts high strength and corrosion resistance. These attributes make it the de facto standard in electronics packaging, vacuum tubes, aerospace, medical devices, and other fields with high precision and performance requirements.
Features of Kovar Seamless Pipe
Low Thermal Expansion Coefficient
Kovar alloy has a thermal expansion coefficient close to that of glass and ceramics (approximately 4.7 × 10⁻⁶/°C), forming a stable seal with these materials during temperature fluctuations, preventing cracking due to differential expansion.
Excellent Sealing Properties
It can form an airtight seal with glass and ceramics and is commonly used in vacuum or high-pressure environments (such as electron tubes and lasers).
High Strength and Corrosion Resistance
It maintains stability in high temperatures and corrosive environments, making it suitable for demanding working conditions.
Good Processability
Mechanical properties can be adjusted through cold working or heat treatment, but the tendency to work hardening is strong, requiring controlled process parameters.
Electromagnetic Shielding Properties
Suitable for precision electronic components requiring electromagnetic shielding.
Applications of Kovar Seamless Pipe
Electronics and Vacuum Devices
Vacuum tubes: Sealed housings for traveling wave tubes and magnetrons.
Semiconductor packaging: Sealing components for lasers, sensors, and glass/ceramics.
Aerospace
Sealed capsules for satellites and spacecraft, and fuel piping systems, utilizing their thermal stability.
Energy and Laser Technology
Sealed components for solar panels and vacuum chambers for high-power lasers.
Medical Equipment
Components requiring vacuum sealing in medical imaging equipment (such as X-ray tubes).
Properties of Kovar Seamless Pipe
Low Thermal Expansion
Kovar is an iron-nickel-cobalt alloy with one of the lowest thermal expansion coefficients among engineered materials (~5×10⁻⁶/°C). This enables compatibility with Pyrex and monolithic borosilicate glass, maintaining structural stability during extreme temperature fluctuations. These properties make Kovar ideal for vacuum tubes, capacitors, and semiconductor devices where thermal stress resistance is critical.
Magnetic Properties
Kovar exhibits controlled magnetic permeability (μ ≈ 2000 when annealed), making it suitable for electromagnetic shielding applications and precision instrument components where magnetic interaction is required.
Corrosion Resistance
Kovar demonstrates exceptional resistance to:
Strong acids and alkaline solutions
Oxidative corrosion up to 500°C
Degradation in high-humidity environments
This makes it suitable for harsh industrial and high-temperature applications.
Mechanical Strength
Kovar's mechanical properties include:
Tensile strength: 550-750 MPa
Yield strength: 300-500 MPa
Impact resistance: Excellent
Vibration damping: Superior
The alloy's toughness derives from its ability to resist fracture under multiaxial stress conditions.
Applications of Kovar Seamless Pipe
Electronics Packaging
Because of its thermal expansion coefficients matching that of glass, Kovar finds extensive applications in region sealing of electronic components, glass materials, in electron-tubed, vacuum packaging, and high-end sensors.
Aerospace
In aerospace applications, Kovar is used in parts with tight integration to other materials (ceramics, glass) and works seamlessly under extreme conditions.
Medical Devices
In the medical field, Kovar alloy is a strategic material used for encapsulation of electronic parts embedded in X-ray and MRI equipment with stable operating environments susceptible to particularities.
Optical Equipment
The alloy is utilized for sealing optical components, maintaining high stability and hermetic performance at high temperatures.
Vacuum Tubes
Kovar finds wide application in glass-bonded end caps for vacuum tubes where sealing of a vacuum environment is needed.
High-End Instruments
Kovar alloy is incorporated in many precision and scientific instruments to sustain long-term stability and performance during extreme operating conditions.
Specification of Kovar Seamless Pipe and other alloys that we can suppl
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Alloy Type |
Trade Name |
UNS No. |
Specifications |
Forms Of Supply |
|||
|
Rod |
Strip |
Wire |
Sheet |
||||
|
Ni29Co17 |
Kovar |
K94610 |
ASTM F15 |
√ |
√ |
√ |
√ |
|
FeNi36 |
Invar 36 |
K93603 |
ASTM 1684 |
√ |
√ |
|
√ |
|
FeNi32Co5 |
Super Invar 32-5 |
KI93500 |
ASTMF1684 |
√ |
√ |
|
√ |
|
FeNi27Co25 |
Ceramvar |
F1466 |
ASTMF1466 |
√ |
√ |
√ |
√ |
|
FeNi42 |
Alloy 42 |
K94100 |
ASTM F30 |
√ |
√ |
|
√ |
|
FeNi46 |
Alloy 46 |
K94600 |
ASTM F30 |
√ |
√ |
|
√ |
|
FeNi48 |
Alloy 48 |
K94800 |
ASTMF30 |
√ |
√ |
|
√ |
|
FeNi50 |
Alloy 52 |
K95050 |
ASTM F30 |
|
|
|
|
FAQ for Kovar Seamless Pipe
Are you a factory or manufacturer?
A: Yes, we are a factory, but we generally use our trading company to handle the business abroad. It will be more convenient to receive the remittance and arrange the shipment.
What is the delivery method?
A: Generally, we send cargo by UPS, DHL, or FedEx. Also, we can send by sea to a seaport or by air to the closest airport.
Why is your product so cost-effective?
A: We cut out the middlemen in the end-to-end manufacturing process, and we obtain raw material directly from its source.
Do you do spot quality inspection or full inspection?
A: 100% full inspection for sure. All unqualified products are discarded.
How do you ensure your lead time?
A: From material preparation to machining and finally to a full inspection. Every stage of production is strictly monitored and controlled to give you an accurate delivery time.
What is the MOQ of Kovar Seamless Pipe?
A: Depends on quantity, generally, no MOQ limit.
How to pay for it?
A: A bank transfer (T/T) will be acceptable.
What is the delivery time?
A: around 7-20 days, which depends on the quantity and production.
What kind of package is it?
A: Generally, we use a carton case or a plywood case with protective material inside to ensure the safety of cargo.
What is the lead time?
A: From the order placed to cargo receiving will take around 10-25 days.
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