Kovar Slab

1.Specilizing in kovar material 2. Have ISO9001:2008 certificate 3. Supply RoHs,Test Report 4. Professional manufacturers

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.

Kovar Slab

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

                                                                               

2.The tensile strength of wire in line with the provisions of Table 2

Status code	State	Tensile strength,N/mm2
R 1/4I 1/2I 3/4I I	Soft state 1/4 Hard state 1/2 Hard state 3/4 Hard state Hard state	<585 585-725 655-795 725-860 >860

                                                                                  

3.Strip tensile strength in line with the provisions of Table 3

Status code	State	Tensile strength,N/mm2
R 1/4I 1/2I 3/4I I	Soft state 1/4 Hard state 1/2 Hard state 3/4 Hard state Hard state	<570 520-630 590-700 600-770 >700

4.Alloy average linear expansion coefficient in line with the Table 4                  

Alloy Grades	Specimen heat treatment system	The average linear expansion coefficient α,10-6/ oC
		20-300 oC	20-400 oC	20-450 oC
kovar	In hydrogen atmosphere heated to 900 ± 20 oC, insulation 1h, and then heated to 1100 ± 20 oC, insulation 15min, to not more than 5 oC / min rate of cooling to below 200 oC released	-----	4.6-5.2	5.1-5.5

5.Alloy typical expansion coefficient                                                 

Alloy Grades	The average linear expansion coefficient a,10-6/ oC
	20-200 oC	20-300 oC	20-400 oC	20-450 oC	20-500 oC	20-600 oC	20-700 oC	20-800 oC
kovar	5.9	5.3	5.1	5.3	6.2	7.8	9.2	10.2

                                                                               

 

Kovar Slab