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Bright Low Expansion Alloys Kovar 4J29 Wire 29HK Wire For Glass Sealing Alloy
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Brand Name:OHMALLOY
Model Number:4J29
Certification:SGS,ISO
Price:20-50USD/KG
Payment Terms:L/C, T/T, , MoneyGram
Supply Ability:25000 KG per month
Delivery Time:25-35 working days
Company Data
Verified Supplier
Contact Person
Qiu
Business Type:
Manufacturer Distributor/Wholesaler Exporter Trading Company
Officials:
Room 311, No.1211, Mudanjiang Road, Baoshan district, Shanghai
Quality:
Quality Certifitation Available
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Product Details
Company Profile
Product Details
OhmAlloy-4J29 (Expansion alloy)
(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)
OhmAlloy-4J29 also known as Kovar alloy. it was invented to meet the need for a reliable
glass-to-metal seal, which is required in electronic devices such
as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum
systems in chemistry and other scientific research. Most metals
cannot seal to glass because their coefficient of thermal expansion
is not the same as glass, so as the joint cools after fabrication
the stresses due to the differential expansion rates of the glass
and metal cause the joint to crack.
OhmAlloy-4J29 not only has thermal expansion similar to glass, but
its nonlinear thermal expansion curve can often be made to match a
glass, thus allowing the joint to tolerate a wide temperature
range. Chemically, it bonds to glass via the intermediate oxide
layer of nickel oxide and cobalt oxide; the proportion of iron
oxide is low due to its reduction with cobalt. The bond strength is
highly dependent on the oxide layer thickness and character. The
presence of cobalt makes the oxide layer easier to melt and
dissolve in the molten glass. A grey, grey-blue or grey-brown color
indicates a good seal. A metallic color indicates lack of oxide,
while black color indicates overly oxidized metal, in both cases
leading to a weak joint.
Application:Mainly used in electric vacuum components and emission control, shock tube, igniting tube, glass magnetron, transistors, seal plug, relay, integrated circuits lead, chassis, brackets and other housing sealing.
Normal composition%
| Ni | 28.5~29.5 | Fe | Bal. | Co | 16.8~17.8 | Si | ≤0.3 |
| Mo | ≤0.2 | Cu | ≤0.2 | Cr | ≤0.2 | Mn | ≤0.5 |
| C | ≤0.03 | P | ≤0.02 | S | ≤0.02 |
Tensile Strength, MPa
| Code of condition | Condition | Wire | Strip |
| R | Soft | ≤585 | ≤570 |
| 1/4I | 1/4 Hard | 585~725 | 520~630 |
| 1/2I | 1/2 Hard | 655~795 | 590~700 |
| 3/4I | 3/4 Hard | 725~860 | 600~770 |
| I | Hard | ≥850 | ≥700 |
Typical Physical properties
| Density (g/cm3) | 8.2 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.48 |
| Temperature factor of resistivity(20℃~100℃)X10-5/℃ | 3.7~3.9 |
| Curie point Tc/ ℃ | 430 |
| Elastic Modulus, E/ Gpa | 138 |
Coefficient of expansion
| θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
| 20~60 | 7.8 | 20~500 | 6.2 |
| 20~100 | 6.4 | 20~550 | 7.1 |
| 20~200 | 5.9 | 20~600 | 7.8 |
| 20~300 | 5.3 | 20~700 | 9.2 |
| 20~400 | 5.1 | 20~800 | 10.2 |
| 20~450 | 5.3 | 20~900 | 11.4 |
Thermal conductivity
| θ/℃ | 100 | 200 | 300 | 400 | 500 |
| λ/ W/(m*℃) | 20.6 | 21.5 | 22.7 | 23.7 | 25.4 |
| The heat treatment process | |
| Annealing for stress relief | Heated to 470~540℃ and hold 1~2 h. Cold down |
| annealing | In vacuum heated to 750~900℃ |
| Holding time | 14 min~1h. |
| Cooling rate | No more than 10 ℃/min cooled to 200 ℃ |
Style of supply
| Alloys Name | Type | Dimension | ||
| OhmAlloy-4J29 | Wire | D= 0.1~8mm | ||
| OhmAlloy-4J29 | Strip | W= 5~250mm | T= 0.1mm | |
| OhmAlloy-4J29 | Foil | W= 10~100mm | T= 0.01~0.1 | |
| OhmAlloy-4J29 | Bar | Dia= 8~100mm | L= 50~1000 | |
Company Profile
Ohmalloy Material Co.,Ltd
Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy.
Ohmalloy Material Co.,Ltd have a full production line from melting, surface cleaning, rolling and slitting, full set of testing machine and can meet all kinds of technical requirement from customer. Our product is widely used in heating equipment, big steel mill, mineral, electrical equipment, food machinery, auto industry, aerospace industry. Our product not only is popular in domestic market, but also been exported to all over the world.
Our company aims to be the best-quality alloy producer in the
world. We insist on developing the more advanced alloy strip
technology, to serve all the customer, improve people’s living
level, make a more green earth in the future
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