Shanghai Tankii Alloy Material Co.,Ltd
| Supply Ability | 200+TON+MONTH |
| Delivery Time | 7-12 days |
| Packaging Details | Spool, Coil, Carton,Wooden case with Plastic Film Accordin to custom's requirements |
| Payment Terms | L/C, T/T, Western Union, MoneyGram |
| Material | Iron Nickel Cobalt |
| Port | Shanghai |
| Surface | Silver, No oil |
| Shape | Round/ Square Pipe Tube |
| Resistance | Low |
| Grade | Precision Alloy |
| Brand Name | TANKII |
| Model Number | 4J29 |
| Certification | ISO9001:2008 |
| Place of Origin | Shanghai, China |
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Product Specification
| Supply Ability | 200+TON+MONTH | Delivery Time | 7-12 days |
| Packaging Details | Spool, Coil, Carton,Wooden case with Plastic Film Accordin to custom's requirements | Payment Terms | L/C, T/T, Western Union, MoneyGram |
| Material | Iron Nickel Cobalt | Port | Shanghai |
| Surface | Silver, No oil | Shape | Round/ Square Pipe Tube |
| Resistance | Low | Grade | Precision Alloy |
| Brand Name | TANKII | Model Number | 4J29 |
| Certification | ISO9001:2008 | Place of Origin | Shanghai, China |
| High Light | precision tubing ，kovar alloy | ||
4j29 Kovar Iron Nickel Cobalt Alloy Pipe Low Resistance Square / Round Tube Pipe
General Description:
4J29, is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, designed to have substantially the same thermal expansion characteristics as borosilicate glass (~5 × 10−6 /K between 30 and 200 °C, to ~10 × 10−6 /K at 800 °C) in order to allow a tight mechanical joint between the two materials over a range of temperatures. It finds application in glass-to-metal seals in scientific apparatus, and conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.
Kovar 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(II) oxide and cobalt(II) 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.
4J29was 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.
Chemical Composition:
| Fe | Ni | Co | C | Si | Mn |
| balance | 29% | 17% | < 0.01% | 0.2% | 0.3% |
Main properties:
| Property | sintered | HIPed |
| Density g /cm3 | 8.0 | 8.35 |
| Hardness / HV1 | 160 | 150 |
| Youngs Modulus / GPa | 138 | 138 |
| Reduction of area at fracture / % | 30 | 30 |
| Yield Strength / MPa | 270 | 270 |
| Thermal conductivity / W/K∙m | 17 | |
| Curie temperature / °C | 435 | |
| Electrical resistivity Ω mm2 / m | 0.49 | |
| Specific heat J/g∙K | 0.46 | |
| Thermal expansion coefficient/10−6 K−1 (25 – 200 °C) | 5.5 | |
| (25–300 °C) | 5.1 | |
| (25–400 °C) | 4.9 | |
| (25–450 °C) | 5.3 | |
| (25–500 °C) | 6.2 | |
Style of supply:
| Alloys Name | Type | Dimension | ||
| 4J29 | Wire | D= 0.1~8mm | ||
| 4J29 | Strip | W= 5~250mm | T= 0.1mm | |
| 4J29 | Foil | W= 10~100mm | T= 0.01~0.1 | |
| 4J29 | Bar | Dia= 8~100mm | L= 50~1000 | |
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
1981
Total Annual:
8000000-100000000
Employee Number:
90~100
Ecer Certification：
Verified Supplier
Shanghai Tankii Alloy Material Co., Ltd.specialized in production of Resistance Heating Alloy, Nickel Chromium Alloy, Iron Chromium Aluminum Alloy, Nickel Aluminum Alloy, Manganin, Copper Nickel Alloy, thermocouple wire, pure nickel and other precision alloy materials in the form of round wire, ribb... Shanghai Tankii Alloy Material Co., Ltd.specialized in production of Resistance Heating Alloy, Nickel Chromium Alloy, Iron Chromium Aluminum Alloy, Nickel Aluminum Alloy, Manganin, Copper Nickel Alloy, thermocouple wire, pure nickel and other precision alloy materials in the form of round wire, ribb...
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