Kovar Strip for Inheritance of Circuit Framework
Grade : 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.
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 | |
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 % |
Shanghai Tankii Alloy Material Co., Ltd. Focus on the production of
resistance alloy(nichrome Alloy, FeCrAl Alloy, copper nickel alloy,
thermocouple wire, precision alloy and thermal spray alloy in the
form of wire, sheet, tape, strip, rod and plate. We've already got
ISO9001 quality system certificate and approval of ISO14001
environmental protection system. We own a complete set of advanced
production flow of refining, cold reduction, drawing and heat
treating etc. We also proudly have independent R&D capacity.
Shanghai Tankii Alloy Material Co., Ltd has accumulated lots of
experiences over 35 years in this field. During these years, more
than 60 management elites and high science and technology talents
were employed. They participated in every walk of the company life,
which make our company keep blooming and invincible in the
competitive market. Based on the principle of "first quality,
sincere service", our managing ideology is pursuing technology
innovation and creating the top brand in the alloy field. We
persist in Quality - the foundation of the survival. It is our
forever ideology to serve you with full heart and soul. We
committed to provide customers all over the world with
high-quality, competitive products and perfect service.
Our products, such us nichrome alloy, precision alloy, thermocouple
wire, fecral alloy, copper nickel alloy, thermal spray alloy have
been exported to over 60 countries in the world. We are willing to
establish strong and long-time partnership with our customers. Most
complete range of products dedicated to Resistance, Thermocouple
and Furnace manufacturers Quality with end to end production
control Technical support and Customer Service.
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