KOVAR ASTM F15 alloy is the most commonly used high integrity control expansion alloy, expansion coefficient and ceramic glass similar to ceramic or glass and metal seal, mainly used in circuit shell, photoelectric shell, tube, crystal, CRT gun parts And other fields. The quasi-stone trade provides the industry with the best particle size of the uniform material, minus -196 ° C stability without change, the special vacuum smelting process ensures consistency between each batch, better oxidation has reached a stronger weld. Our material quality is higher than ASTM F15 and US military standard MIL I 23011C Class 1.
Material description
Kovar is a vacuum-smelted iron-nickel-cobalt low-expansion alloy with a chemical composition that is controlled to a very narrow range to ensure accurate equilibrium thermal expansion. At the same time, strict quality control during the manufacturing process also ensures a balanced physical and mechanical performance, more suitable for deep drawing, stamping and various types of cutting.
Material use
Kovar® is used for vacuum sealing of hard glass and ceramics. Widely used in tubes, microprocessors, transistors and diodes. In the integrated circuit, it is used for flat integrated circuits and dual in-line package.
Sealed preparation
All Kovar-made parts should be degassed and annealed in a humidified atmosphere. Hydrogen is injected into the water at room temperature, through the blister to reach the wet, must be careful to prevent surface carbonation. The heat treatment furnace should have a cooling chamber that provides the same atmosphere. The heat treatment was carried out at a temperature of 1540/2010 ° F (838/1099 ° C), starting from the lowest temperature, rising to the highest temperature in 20 minutes, then moving the parts to the cooling zone, cooling to 570 ° F (299 ° C ) After the removal.
Metal and hard glass seal, the metal is best to have a layer of oxide film, the best oxide film is thin and tightly adsorbed on the metal surface. Such an oxide film can be heated to 1200/1290 ° F (650/700 ° C) in an atmospheric environment and for a period of time until the dark gray surface becomes a hazel oxide film.
Physical performance
Specific gravity of 8.36
Density 0.3020lb / in3
chemical component%
| Ni |
C |
Fe |
Co |
Mn |
Si |
| 29 |
0.02 |
Reste |
17 |
0.3 |
0.2 |
Doris
Phone:+8613400008153
Tel: 0510-88222973
Fax: 0510-88222975
Web: taixie.en.made-in-china.com
Add:No.22, Xinfeng Road, Xin District, Wuxi, Jiangsu, China.
Over 16 years of specialist experience in Copper, Mould steel, steel alloy, aluminum ! Welcome to order and customized.
Audited Supplier 
){kind=link}