Bright Kovar 4j29 Strip for Stamping IC Framework

Model NO.: 4J29 Strip


Material: Feni


Shape: Strip


Surface: Bright


Width: 5-280mm


Trademark: TANKII-429


Origin: China




Product Type: Strip


Carbon Content: Low Carbon


Condition: Soft


Thickness: 0.1-2mm


MOQ: 30 Kgs


Transport Package: Coil, Waterproof Paper, Wooden Case


HS Code: 722699900


Bright Kovar 4j29 Strip for Stamping IC Framework



Classification : the alloy of expansion characteristics



Application: Kovar (trademark of CRS Holdings, inc., Delaware[1]) is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10?6 /K between 30 and 200 °C, to ~10 × 10?6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.





Chemical Composition in % Kovar

Ni 28,5-29,5%	Fe 51,14-54,5%	C 0.03%	Si 0.3%	Mn 0,4 %	S o 0.015%
P 0.015%	o 17-18%	Ti 0.1%	Al 0.2%	Cu 0.2%	Cr 0,1 %

The thermal properties of alloy

Temperature coefficient of linear expansion αsr ? 10-6 K-1 in the temperature range, ° C								inflection point temperature, ° C No less		Heat treatment regime blanks and samples
20-80		20-100	20-300	20-400	20-450	20-500	20-800
-		-	4,6-5,6	4,6-5,2	-	5,9-6,4	-	420		samples and blanks annealing in hydrogen, a vacuum or protective atmosphere at a temperature (960 ± 20) ° C, holding 1 hr., cooling with the furnace or container to 200 ° C at a rate not exceeding 10 ° C / min
Property								sintered		HIPed
Density / g cm3								8.0		8.35
Hardness / HV1								160		150
Youngs Modulus / GPa								138		138
reduction of area at fracture / %								30		30
yield strength / MPa								270		270
thermal conductivity / W/Km								17
Curie Temperature / °C								435
electrical resistivity Ω mm2 / m								0.49
specific heat J/gK								0.46
thermal expansion coefficient/10?6 K?1 (25 - 200 °C)								5.5
(25-300 °C)								5.1
(25-400 °C)								4.9
(25-450 °C)								5.3
(25-500 °C)								6.2

The name Kovar is often used as a general term for Fe-Ni Alloys with these particular thermal expansion properties. Note the related particular Fe-Ni alloy Invar which exhibits minimum thermal expansion.



TANKII, referring to the presence of high-power production, offers customers buy alloy Kovar in the required quantities and ensures minimum time shipments of rolled metal products, made on the basis of Kovar.

Contact us if you need more details on Kovar Strip. We are ready to answer your questions on packaging, logistics, certification or any other aspects about 4j29 Strip、Sealing Alloy Strip. If these products fail to match your need, please contact us and we would like to provide relevant information.

Product Categories : Precision Alloys > NiFe Alloys