Shanghai Tankii Alloy Material Co.,Ltd
Shanghai Tankii Alloy Material Co.,Ltd First Quality, Sincere Service
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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.
