ASTM F15 Alloy Sheet 1.Specilizing in kovar material 2. Have ISO9001:2008, RoHs,Test Report 3. A professional factory
kovar alloy
Glass sealed and controlled expansion alloys
*Kovar alloy,ASTM F15,Nilo-k,UNS K94610(FeNi29Co17),Chinese 4J29
*Specifications:ASTM F15;DIN 17745;S.E.W.385;Werkstoff Nr.1.3981;
AFOR NF A54-301
Detailed Description
Characteristics:
1.Kovar has a wide usage in the electronics industry, such as metal parts bonded to hard glass envelopes. These parts are used for such devices as power tubes and X-ray tubes, etc.
2.In the semiconductor industry kovar is used in hermetically sealed packages for both integrated and discrete circuit devices.
3.Kovar is provided in a variety of forms to facilitate efficient manufacturing of various metal parts. It has thermal expansion characteristics matching those of hard glass. Used for matched expansion joints between metals and glass or ceramics.
4.Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining.
Applications:
1.Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials.2.This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In intergrated circuits, it has been used for the flat pack and the dual-in-line package.
Available in: Tube,Pipe, Sheet, Strip,Bar, Rod and Wire.
1.Alloy grades and chemical composition consistent with the provisions of table 1
the chemical composition of Kovar(%) | ||||||||||
C | P | S | Mn | Si | Cu | Cr | Mo | Ni | Co | Fe |
Not more than(≤) | ||||||||||
0.03 | 0.020 | 0.020 | 0.5 | 0.30 | 0.20 | 0.20 | 0.20 | 28.5~29.5 | 16.8~17.8 | Balance |
Notes:
The content of Al,Mg,Zr and Ti should be no more than 0.10%,the total content should be no more than 0.20%.Otherwise ,the supplier’s PO or contract shall indicate clearly.Under condition that the everage coefficient of linear expanion meets the requirements of the standard,the content of nickel and cobalt are allowed to deviate from the stated range.
2.The tensile strength of wire in line with the provisions of Table 2
Status code | Status | Tensile strength,N/mm2 |
R 1/4I 1/2I 3/4I I | Soft state 1/4 Hard 1/2 Hard 3/4 Hard Hard | <585 585—725 655—795 725—860 >860 |
3.Strip tensile strength in line with the provisions of Table 3
Status code | Status | Tensile strength,N/mm2 |
R 1/4I 1/2I 3/4I I | Soft state 1/4 Hard 1/2 Hard 3/4 Hard Hard | <570 520—630 590—700 600—770 >700 |
4.Alloy average linear expansion coefficient in line with the Table 4
Alloy Grade | Specimen heat treatment system | The average linear expansion coefficienta,10-6/ °C | ||
20-300 °C | 20-400 °C | 20-450 °C | ||
kovar | Heated to temperature of 900± 20°Cin the hydrogen,hold for 1h;re-heat to1100±20°C, hold for 15min;cooled to 200°C at a rate less than 5°C. | ----- | 4.6-5.2 | 5.1-5.5* |
5.Alloy typical expansion coefficient
Alloy Grade | The average linear expansion coefficient a,10-6/ °C | |||||||
20-200 °C | 20-300 °C | 20-400 °C | 20-450 °C | 20-500 °C | 20-600 °C | 20-700 °C | 20-800 °C | |
kovar | 5.9 | 5.3 | 5.1 | 5.3 | 6.2 | 7.8 | 9.2 | 10.2 |
Specification: Plate, sheet, strip, rod, bar, wire, tube.
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F15 Alloy sheet
