Audited Supplier
Kovar
Strip
Feni Alloys
Low Carbon
Bright,Soft
Ualloy
Ualloy
Coil, Waterproof Paper, Plywood Pallet
GB/T14985
China
72269990
Product Description
(Common Name:Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)
UALLOY-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.
UALLOY-4J29 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.
Mainly used inelectric vacuumcomponents andemission control,shocktube, igniting tube, glassmagnetron, transistors, sealplug, relay, integrated circuitslead, chassis, brackets and otherhousingsealing.
Coefficient of expansion
Thermal conductivity
The heat treatment process
Style of supply
UALLOY-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.
UALLOY-4J29 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.
Mainly used inelectric vacuumcomponents andemission control,shocktube, igniting tube, glassmagnetron, transistors, sealplug, relay, integrated circuitslead, chassis, brackets and otherhousingsealing.
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
Typical Physical properties
| Density (g/cm3) | 8.2 |
| Electrical resistivity at 20ºC(mm2/m) | 0.48 |
| Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC | 3.7~3.9 |
| Curie pointTc/ ºC | 430 |
| Elastic Modulus, E/ Gpa | 138 |
Coefficient of expansion
| θ/ºC | α1/10-6ºC-1 | θ/ºC | α1/10-6ºC-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/ºC | 100 | 200 | 300 | 400 | 500 |
| λ/ W/(m*ºC) | 20.6 | 21.5 | 22.7 | 23.7 | 25.4 |
The heat treatment process
| Annealing for stress relief | Heated to 470~540ºC and hold 1~2 h. Cold down |
| annealing | In vacuum heated to 750~900ºC |
| Holding time | 14 min~1h. |
| Cooling rate | No more than 10 ºC/min cooled to 200 ºC |
Style of supply
| Alloys Name | Type | Dimension | |
| UAlloy-4J29 | Wire | D=0.1~8mm | |
| UAlloy-4J29 | Strip | W= 5~250mm | T= 0.1mm |
| UAlloy-4J29 | Foil | W= 10~100mm | T= 0.01~0.1 |
| UAlloy-4J29 | Bar | Dia=8~100mm | L=50~1000 |
