Beryllium oxide: Difference between revisions
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'''Beryllium oxide (BeO)''' is an electrically insulating material with a higher thermal conductivity than most metals and any other non-metal except diamond. | '''Beryllium oxide (BeO)''' is an electrically insulating material with a higher thermal conductivity than most metals and any other non-metal except diamond<ref>[[wikipedia:Beryllium oxide|Beryllium oxide]] @ Wikipedia</ref>. | ||
For this reason, BeO ceramics are | For this reason, BeO ceramics are used as substrates in power semiconductors, especially for RF applications. BeO is useful as an intermediary thermal dissipater between silicon and base metals due to its coefficient of thermal expansion. It is also used as a structural ceramic for high-performance microwave devices, vacuum tubes, magnetrons, and gas lasers. | ||
BeO is carcinogenic in powdered form and may cause berylliosis, a chronic lung disease. | '''BeO is carcinogenic in powdered form''' and may cause berylliosis, a chronic lung disease. | ||
Once fired into solid form, it is safe to handle if not subjected to machining, crushing or grinding that generates dust. | Once fired into solid form, it is safe to handle if not subjected to machining, crushing or grinding that generates dust. | ||
== | As a consequence, ''hermetic packages containing BeO must not be opened, and ceramic packages must not be broken, crushed or otherwise damaged''. | ||
* [[ | |||
Since Beryllium is relatively expensive, its main use is “in high-end products with long life-cycles”<ref>[https://ec.europa.eu/environment/pdf/waste/weee/hazardous_substances_report.pdf EU Study on Hazardous Substances in Electrical and Electronic Equipment, Not Regulated by the RoHS Directive] (2008)</ref> where alternatives do not exist. This is one of the factors why BeO is presently not restricted in RoHS. | |||
==References== | |||
<references /> | |||
==Some components containing BeO== | |||
* [[151-0614-00]] transistor (used in [[SG503]]) | |||
* [[155-0064-00]] and [[155-0125-00]] hybrids (BeO substrate fully enclosed within hermetic metal can) | |||
* [[155-0176-00]] | |||
* The [[214-0317-00]] transistor heat sink used in the [[453]] and [[547]] is made of BeO. | |||
[[Category:Repair issues]] | [[Category:Repair issues]] | ||
Latest revision as of 00:43, 2 November 2023
Beryllium oxide (BeO) is an electrically insulating material with a higher thermal conductivity than most metals and any other non-metal except diamond[1].
For this reason, BeO ceramics are used as substrates in power semiconductors, especially for RF applications. BeO is useful as an intermediary thermal dissipater between silicon and base metals due to its coefficient of thermal expansion. It is also used as a structural ceramic for high-performance microwave devices, vacuum tubes, magnetrons, and gas lasers.
BeO is carcinogenic in powdered form and may cause berylliosis, a chronic lung disease. Once fired into solid form, it is safe to handle if not subjected to machining, crushing or grinding that generates dust.
As a consequence, hermetic packages containing BeO must not be opened, and ceramic packages must not be broken, crushed or otherwise damaged.
Since Beryllium is relatively expensive, its main use is “in high-end products with long life-cycles”[2] where alternatives do not exist. This is one of the factors why BeO is presently not restricted in RoHS.
References
Some components containing BeO
- 151-0614-00 transistor (used in SG503)
- 155-0064-00 and 155-0125-00 hybrids (BeO substrate fully enclosed within hermetic metal can)
- 155-0176-00
- The 214-0317-00 transistor heat sink used in the 453 and 547 is made of BeO.