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Vulcan Metal Group

  • 23888 Madison Street Torrance, CA 90505 United States
Vulcan Metal Group supply raw specialty metals and offer machining and manufacturing services for metals such as tungsten, molybdenum, kovar, tantalum, niobium.
  • Specialty Metals by Experts
  • 23888 Madison Street Torrance, CA 90505 United States

Vulcan Metal Group

Vulcan Metal Group supply raw specialty metals and offer machining and manufacturing services for metals such as tungsten, molybdenum, kovar, tantalum, niobium.
  • Specialty Metals by Experts
  • 23888 Madison Street Torrance, CA 90505 United States
Vulcan Metal Group supply raw specialty metals and offer machining and manufacturing services for metals such as tungsten, molybdenum, kovar, tantalum, niobium.
  • Specialty Metals by Experts
  • 23888 Madison Street Torrance, CA 90505 United States
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Added on 27 August 2022
Low Expansion Alloys

For hundreds of years, engineers have experimented with different alloys, in an attempt to control heat expansion. In certain applications such as vacuum tubes or optoelectronics, it is necessary to adhere to set expansion requirements over specific temperature ranges.

In these cases, the following materials possess the characteristics needed.

Alloy 42
Alloy 52
Invar 36
Super Invar 32-5
Kovar
Used in applications where a hermetic seal between the metal, glass or ceramic is required, controlled expansion alloys are also used in vacuum tubes, optoelectronics, lightbulbs and other products where a degree of thermal expansion takes place (based on the specific temperature at any given time).

Here, Phillip Guthrie of Vulcan Metal Group addresses key questions that buyers should consider when selecting controlled expansion alloys.

Q: What are the primary controlled expansion alloys?
A: The primary controlled expansion alloys include Alloy 36, Alloy 42, Alloy 48, Alloy 52 and Alloy 54, each of which has its own thermal expansion coefficient and is used for specific applications. Alloy 36, for example, is most often used in precision laser equipment, instrumentation and electronic devices, where Alloy 42 gets the most use in thermostats and electrical switches. Alloy 48 is more widely used in electrical wiring or in industrial thermostats in environments that have to be heated up to 450 °C.

Q: What are some of the other commonly-used expansion alloys?
A: Alloy ASTM F-15 is comprised of nickel, cobalt and iron and used frequently in machining and deep drawing. This is one of the more popular controlled expansion options for hermetic sealing applications.

Invar 36 is a low-expansion alloy made of nickel and iron. It’s typically used in applications with minimum expansion requirements. Nickel 200/201/205/233 are all commercially pure, non-alloyed Nickel options that are used in the electronics industry. Some of the products that are made with this alloy include fuel cells, terminals, cathode shields and semiconductor supports.


https://vulcanmetalgroup.com/low-expansion-alloys/

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