Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Strontium Ferrite?
Mechaton
Harmless
*




Posts: 22
Registered: 24-3-2006
Member Is Offline

Mood: No Mood

[*] posted on 17-10-2006 at 21:13
Strontium Ferrite?


I'm interested in making some Strontium ferrite for BIG transformer cores. Anybody have any info on how it's made? I'm having trouble getting good resources.

If anyone knows of an easier to make or obtain core material I'd be interested in hearing about it.
View user's profile View All Posts By User
12AX7
Post Harlot
*****




Posts: 4803
Registered: 8-3-2005
Location: oscillating
Member Is Offline

Mood: informative

[*] posted on 17-10-2006 at 22:11


Should be something like, make a slip or whatever of ball-milled SrO and Fe2O3 (as SrFe2O4? Not to suggest spinel of course, as I recall spinels only form with the smaller ions i.e. Mg, Fe(II), etc.). A gum binder or such will be needed since this isn't clay. 99% purity should be good. Press or cast to shape, dry, and sinter (fire) to something just below the melting point.

I didn't know strontium ferrites were used. I have heard only transition metals like manganese and zinc. I forget which ones are the hard ferrites (i.e. ceramic magnets).

Overall this is going to be more trouble than buying, especially if you want a 100kW core or something. It'll take days to fire something that big without cracking, and you just don't have the process control, chemical or thermal, that industry has.

If you do go through with this, I would love to get a sample of a typical product though!

Tim




Seven Transistor Labs LLC http://seventransistorlabs.com/
Electronic Design, from Concept to Layout.
Need engineering assistance? Drop me a message!
View user's profile Visit user's homepage View All Posts By User This user has MSN Messenger
Mr. Wizard
International Hazard
*****




Posts: 1040
Registered: 30-3-2003
Member Is Offline

Mood: No Mood

[*] posted on 17-10-2006 at 22:12


You can get Strontium Nitrate from red road flares, although I'm sure it's not pure. You'de have to remove the oils, the wood flour and the Sulfur.
View user's profile View All Posts By User
tumadre
Hazard to Others
***




Posts: 169
Registered: 10-5-2005
Member Is Offline

Mood: No Mood

[*] posted on 18-10-2006 at 00:17


the temperatures required are very high,

I would say use what is already avalible, grind it up and use a small amount of binder and fire it, or grind into power and mix with epoxy, but that would be like a powerded iron core, not what you want?
View user's profile View All Posts By User
not_important
International Hazard
*****




Posts: 3873
Registered: 21-7-2006
Member Is Offline

Mood: No Mood

[*] posted on 18-10-2006 at 00:19


having troubles getting my reply to post, trying fragments

hmmm, it looks as if
http://www.hoosiermagneticsinc.com will sell ferrite powders
View user's profile View All Posts By User
not_important
International Hazard
*****




Posts: 3873
Registered: 21-7-2006
Member Is Offline

Mood: No Mood

[*] posted on 18-10-2006 at 00:22


while making them is discussed in many places, including

http://www.blackwell-synergy.com/doi/abs/10.1111/j.1151-2916...

http://cat.inist.fr/?aModele=afficheN&cpsidt=13664922

http://www.springerlink.com/content/b866j67715625473/


Either precipitation or prolonged ball milling, if not both, looks to be needed. Also appears than firing at 600 to 1200 C is needed.
View user's profile View All Posts By User
not_important
International Hazard
*****




Posts: 3873
Registered: 21-7-2006
Member Is Offline

Mood: No Mood

[*] posted on 18-10-2006 at 00:27


and the last URL, after finding one to the same reference, and that doesn't choke the forum software

http://www.ingentaconnect.com/content/ap/cs/2001/00000236/00...
View user's profile View All Posts By User
tumadre
Hazard to Others
***




Posts: 169
Registered: 10-5-2005
Member Is Offline

Mood: No Mood

[*] posted on 18-10-2006 at 00:43


even if you achieve %85 or %90 the density achieved by the same ferrite product produced by industry, the magnetic properties will be vastly different.

so unless there is nothing fundamentaly different between industry and DIY ferrite production, your not going to have good magnetic qualities.
View user's profile View All Posts By User

  Go To Top