Precision-Made Kovar Alloy with Steel Sealing Material

Product Details
Customization: Available
Classification: Precious Metal
Model No.: 4j29
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ISO 9001, ISO 9000, ISO 14001, ISO 14000, QC 080000
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  • Precision-Made Kovar Alloy with Steel Sealing Material
  • Precision-Made Kovar Alloy with Steel Sealing Material
  • Precision-Made Kovar Alloy with Steel Sealing Material
  • Precision-Made Kovar Alloy with Steel Sealing Material
  • Precision-Made Kovar Alloy with Steel Sealing Material
  • Precision-Made Kovar Alloy with Steel Sealing Material
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Basic Info.

Model NO.
4J29
Type
Seamless
Status
Polished
Product Type
Tube
Material
Feni
Carbon Content
Low Carbon
PCD
98mm
Transport Package
Wooden Case
Specification
10x1
Trademark
HUONA
Origin
Shanghai
HS Code
7505120000
Production Capacity
1000 Tons/Year

Product Description

 4j29 Kovar Alloy Tube for Sealing Material
4J29  (Expansion alloy)
(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)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.

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.
 
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.
 
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.
Precision-Made Kovar Alloy with Steel Sealing MaterialPrecision-Made Kovar Alloy with Steel Sealing MaterialPrecision-Made Kovar Alloy with Steel Sealing Material

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