29NK, GOST 10994-74, Covar Strip/Kovar Strip Pricision Alloy Srtip

Min.Order: 30

Product origin: Shanghai, China

Infringement complaint:

Complaint

US$ -1

Description

Kovar nickel-cobalt ferrous alloy/ 29HK/ 4J29

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