Ceramic Magnets and their durability in temperature fluctuations

AI Thread Summary
Ceramic magnets, specifically ferrite types, can lose strength when subjected to extreme temperature fluctuations, such as cycling from -40° C to +20° C. While permanent magnets generally gain strength in cold conditions, the coercive field of some ferrites may decrease significantly at low temperatures, making them more susceptible to demagnetization. This sensitivity to weak external fields can lead to a gradual reduction in magnetization over time. Understanding the specific type of ceramic and its properties is crucial for assessing durability in harsh environments. Overall, temperature cycling can negatively impact the performance of ceramic magnets used in industrial applications.
bluerayz
Messages
2
Reaction score
0
I work in the Aggregate industry and we use ceramic magnets to pull ferrous materials out of the feed of Aggregate materials passing by on a conveyor belt.
So i have a basic knowledge about how they work, but my technical knowledge about magents is extremely lacking.

Wondering if anyone would have any theories as to why a ceramic permanent magnet would lose its strength working in a place with extremely cold temparatures? I.E. -40° C.
I know that permanent magnets become stronger when they are put in extremely cold temps, but I'm wondering if going from -40 to +20 every 24 hours for months in a row might gradually decrease the strength over time??

Any thoughts would be helpful. Thanx in advance.
 
Physics news on Phys.org
What kind of ceramic? Is it a ferrite?
 
It is Ferrite.
 
The values of the coercive field of some ferrites may decrease significantly at low temperature. This will make the magnet more sensitive to weak external fields, which may demagnetize it or reduce its magnetization.
 

Thread 'How to picture the vector potential?'

Susskind (in The Theoretical Minimum, volume 1, pages 203-205) writes the Lagrangian for the magnetic field as ##L=\frac m 2(\dot x^2+\dot y^2 + \dot z^2)+ \frac e c (\dot x A_x +\dot y A_y +\dot z A_z)## and then calculates ##\dot p_x =ma_x + \frac e c \frac d {dt} A_x=ma_x + \frac e c(\frac {\partial A_x} {\partial x}\dot x + \frac {\partial A_x} {\partial y}\dot y + \frac {\partial A_x} {\partial z}\dot z)##. I have problems with the last step. I might have written ##\frac {dA_x} {dt}...
View full post »
Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)'

Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (Second part)'

I am reading the Griffith, Electrodynamics book, 4th edition, Example 4.8. I want to understand some issues more correctly. It's a little bit difficult to understand now. > Example 4.8. Suppose the entire region below the plane ##z=0## in Fig. 4.28 is filled with uniform linear dielectric material of susceptibility ##\chi_e##. Calculate the force on a point charge ##q## situated a distance ##d## above the origin. In the page 196, in the first paragraph, the author argues as follows ...
View full post »

Similar threads

Ferromagnetic-Paramagnetic Transition near Room Temperature
Replies
2
Views
2K
Aerospace Engineer Exploring Permanent Magnet Research
Replies
1
Views
478
Ultra high magnetic fields using carbon nanotubes
Replies
1
Views
11K
Can Permanent Magnets Efficiently Heat Water via Induction?
Replies
5
Views
6K
Is my fictional Solar System stable and realistic?
Replies
21
Views
4K
Could New Materials Propel China's Industry to Bill Gates-Level Success?
Replies
4
Views
10K
Starring Gravity, Co-Starring Magnetism
Replies
7
Views
4K
How bright is the future of Maglev Cars?
Replies
19
Views
12K
I have lots of questions on physics
Replies
10
Views
3K
Physics What are the steps to becoming a physicist?
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top