in today’s video we’re going to be
taking a look at the properties of
magnetic metals and the magnets
themselves when you heat them up or even
melt them down we’ve got a couple of
magnets a bar of mild steel and a
furnace and we want to see what happens
if we start combining these together
magnets of course right now are
attracted to the bar of steel but we
want to see what happens if we start
heating these things up if we get our
steel glowing orange hot will it still
be attracted to the magnets if we get
our magnets glowing orange hot will they
still be attracted to the steel and
after we do all of those things we might
just try melting some of these down the
steel and the magnets until they’re
completely liquid and see how that
affects the magnetism here’s the basic
idea
we’ll try heating up a piece of steel
and seeing how long it retains its
magnetic properties well then try
heating up the magnets themselves and
see how well they retain their magnetic
properties finally we’ll try melting
down both and seeing how they interact
with each other first up we’re gonna
fire up our furnace put our bar of Steel
down inside so one end of it gets super
glowing hot we’re gonna pull that out
and see if it is still attracted to
either of our magnets one end of our
steel bar is now glowing orange hot and
this furnace gets up to about 2,000
degrees so let’s see how magnetic a
2,000 degree bar of mild steel is so in
theory at about 1400 degrees it stops
being magnetic
pretty much nothing on the ceramic
magnet our steel was glowing orange hot
and at that point it was no longer
attracted to either of our magnets the
ceramic magnet isn’t all that strong so
it shouldn’t take that much loss of
magnetism for it’s not stick to that but
the silvery neodymium magnet is very
powerful that thing has a lot of pull
strength and that had no attraction to
the steel at approximately fourteen
hundred twenty degrees Fahrenheit mild
carbon steel is supposed to lose all of
its magnetism and this bar was well
above that temperature so it doesn’t
really surprise me that it got to the
point where it wasn’t attractive the
magnets in theory the steel also has to
cool down to about five hundred degrees
before it regains that attraction to
magnetism after it’s been heated up that
high so now I want to try the reverse I
want to see what happens if we heat our
magnets up see if they stop being
[Music]
oh and it’s shattering immediately well
that didn’t last long that just exploded
into pieces so now we know that ceramic
or ferrite magnets really don’t like to
be heated up that’s just gone I gotta
say that I know these are pieces and so
they’re not gonna have as much
directional magnetic charge but even
just being in there for that long this
isn’t really sticking to the tongs much
at all but our ferrite magnet has now
had time to cool down and it is now
doing a better job of sticking to our
tongs not every piece that piece in
particular seems quite weak furnace has
had just a minute to cool off so now I
can just leave you know this let back
get nice and hot now these magnets are
mostly made of neodymium neodymium is
atomic element number 60 and these
magnets while largely made of neodymium
also contains some other metals
neodymium on its own has a melting point
of 1861 degrees Fahrenheit which is
below the temperature that our furnace
gets to so it’s possible that our whole
magnet could just melt in here the
magnets however are an alloy and it
could be that whatever other metals are
mixed in with it raises the melting
point so our magnet will be fine that is
one glowing hot magnet let’s see if it’s
attracted to our steel bar nothing zero
attempts to grab on to that bar it’s not
rolling with it it’s not sticking to it
just really zero let’s take this out and
set it on our brick not sticking to our
tongs at all either let’s see if it
starts sticking as it cools down the
same way that the steel bar started
sticking as it cooled down while it’s
cooling down there’s something else I
want to try it got these two identical
square magnets with the couple of holes
in them we’re gonna put one in the
furnace heat it up till it’s red-hot
take it out and then place the other
magnet right on top of it and see if it
makes any difference in how much
magnetism this gains back as it cools
down one of the square magnets is
heating up in the furnace we’ve got our
other square magnet and I want to see if
it’s attracted to this first magnet we
heat it up at this point
the first neodymium magnet we put in
there is still not being attracted to
the metal at all so I’m curious if our
fixed magnet here will be attracted to
that material even though it’s
attracted to steel that is a yes so the
bigger magnet that we put in first the
cylinder is not attracted to the metal
itself but another magnet is attracted
to the cylinder magnet that makes me
think we have eliminated all the
magnetism out of this magnet and it may
or may not come back let’s pull our
square magnet out of the furnace and let
it cool down in the presence of this
magnets not attracted to the tongs at
all okay currently not attracted much
maybe a tiny tiny charge let’s let those
cool down completely our magnets have
now had long enough to cool down and we
have nothing there is a very slight draw
it is really little but you just barely
feel it it’s not enough to lift the
magnet it’s just barely enough to feel a
tiny tug of resistance all right well
let’s see about our magnets cooled down
together a little bit to that steel
almost nothing
[Music]
oh this magnet got ruined so we have
really depleted these magnets of their
charge but a non depleted magnet is
still very attracted to both of these
we’ve got our miniature arc furnace
which gets well hot enough to melt
pieces of steel and almost certainly
these magnets as well first we’re gonna
melt down a piece of mild steel and see
if there’s any magnetic attraction to it
I kind of doubt it since it does seem to
lose its magnetic attraction once it’s
glowing orange but we’ll see what
happens we’ll give it a try and we’ll
even let it cool down somewhat in the
presence of a magnet and see if that can
magnetize the steel itself steel has a
tendency to spark quite a bit when it’s
melted in this hot so I’m gonna be doing
this with the lid on the furnace to do
our testing we’re gonna have a magnet
stuck on the end of our steel bar once
it’s melted down we’ll carefully remove
the lid and see what happens if we bring
I would say that is not attracted to it
at all
well I was exciting all right that is
starting to cool down and I’m just
leaving this magnet near it it could be
that the heat from the molten steel is
just gonna ruin the magnet oh well I
think the heat is winning my magnet just
slid right off of my steel bar I think
[Music]
our steel hedges really solidly attached
itself to our fire break here that is a
new still powerfully magnetic magnet I’m
gonna take our trend of steel let it
cool down in the water right next to
that magnet chunk of steel cooled down
next to a magnet it already ruined the
magnetism of the first magnet cooled
down even further in the presence of a
second magnet has it gained any magnetic
properties of its own hmm I’m gonna say
not so much well let’s move on let’s see
what happens if we just melt down a
magnet that is a super bright man holy
cow that is giving off a lot of light
like a lot huh the inside is molten my
think it was about 1,400 degrees
Fahrenheit and this was definitely
getting hot enough to melt the steel
which melts at about 2500 degrees
Fahrenheit but the magnets were not
melting as easily as the steel so
something about the alloy of the
composition clearly melts at a fairly
high temperature as a final test I want
to see what happens if I try and melt
there is some melted ferrite magnet
cooled down fairly quickly it doesn’t
like to stay liquid and kind of hard to
direct the arc right at it because as it
heats up like it did in the other
furnace it just kind of shatters and
goes everywhere so it doesn’t like to
stay in one place to be heated up nicely
but it does melt and like all the other
magnets we’ve tested as it melts it it
really loses all of its magnetic power
no longer attracted to steel melting
metal and magnets really does seem to
ruin the magnetism that they have in
them the magnets stop being magnetic
when you heat them up too much and they
don’t get it back after they cooled down
heating up steel while it’s over that
mark of about 1400 degrees Fahrenheit it
does lose all of its magnetic charge but
when the steel cools down it does become
magnetic again melting steel down into a
little blob I was hoping that we would
be able to put a magnetic field around
the steel but in putting the magnet
close to the liquid steel the magnet
actually heated up so much that it lost
all of its magnetic charge and it’s no
longer attracted to that piece of steel
or any other metal it’s just not a
magnet anymore it’s just a block of was
magnet I don’t know what to call that
maybe someday in the future we’ll try
melting down steel again and letting it
cool down in the presence of a powerful
electromagnet which shouldn’t have its
field ruined by the heat guys does not
all there is to see that box up at the
top will transport you directly to our
last video and you can go check that out
the box at the bottom let’s show you
what you tube things you need to be
watching next this bomb here in the
middle will subscribe you to the channel
so you never miss a video don’t forget
to ring that Bell and we will see you in the next one talk today
taking a look at the properties of
magnetic metals and the magnets
themselves when you heat them up or even
melt them down we’ve got a couple of
magnets a bar of mild steel and a
furnace and we want to see what happens
if we start combining these together
magnets of course right now are
attracted to the bar of steel but we
want to see what happens if we start
heating these things up if we get our
steel glowing orange hot will it still
be attracted to the magnets if we get
our magnets glowing orange hot will they
still be attracted to the steel and
after we do all of those things we might
just try melting some of these down the
steel and the magnets until they’re
completely liquid and see how that
affects the magnetism here’s the basic
idea
we’ll try heating up a piece of steel
and seeing how long it retains its
magnetic properties well then try
heating up the magnets themselves and
see how well they retain their magnetic
properties finally we’ll try melting
down both and seeing how they interact
with each other first up we’re gonna
fire up our furnace put our bar of Steel
down inside so one end of it gets super
glowing hot we’re gonna pull that out
and see if it is still attracted to
either of our magnets one end of our
steel bar is now glowing orange hot and
this furnace gets up to about 2,000
degrees so let’s see how magnetic a
2,000 degree bar of mild steel is so in
theory at about 1400 degrees it stops
being magnetic
pretty much nothing on the ceramic
magnet our steel was glowing orange hot
and at that point it was no longer
attracted to either of our magnets the
ceramic magnet isn’t all that strong so
it shouldn’t take that much loss of
magnetism for it’s not stick to that but
the silvery neodymium magnet is very
powerful that thing has a lot of pull
strength and that had no attraction to
the steel at approximately fourteen
hundred twenty degrees Fahrenheit mild
carbon steel is supposed to lose all of
its magnetism and this bar was well
above that temperature so it doesn’t
really surprise me that it got to the
point where it wasn’t attractive the
magnets in theory the steel also has to
cool down to about five hundred degrees
before it regains that attraction to
magnetism after it’s been heated up that
high so now I want to try the reverse I
want to see what happens if we heat our
magnets up see if they stop being
[Music]
oh and it’s shattering immediately well
that didn’t last long that just exploded
into pieces so now we know that ceramic
or ferrite magnets really don’t like to
be heated up that’s just gone I gotta
say that I know these are pieces and so
they’re not gonna have as much
directional magnetic charge but even
just being in there for that long this
isn’t really sticking to the tongs much
at all but our ferrite magnet has now
had time to cool down and it is now
doing a better job of sticking to our
tongs not every piece that piece in
particular seems quite weak furnace has
had just a minute to cool off so now I
can just leave you know this let back
get nice and hot now these magnets are
mostly made of neodymium neodymium is
atomic element number 60 and these
magnets while largely made of neodymium
also contains some other metals
neodymium on its own has a melting point
of 1861 degrees Fahrenheit which is
below the temperature that our furnace
gets to so it’s possible that our whole
magnet could just melt in here the
magnets however are an alloy and it
could be that whatever other metals are
mixed in with it raises the melting
point so our magnet will be fine that is
one glowing hot magnet let’s see if it’s
attracted to our steel bar nothing zero
attempts to grab on to that bar it’s not
rolling with it it’s not sticking to it
just really zero let’s take this out and
set it on our brick not sticking to our
tongs at all either let’s see if it
starts sticking as it cools down the
same way that the steel bar started
sticking as it cooled down while it’s
cooling down there’s something else I
want to try it got these two identical
square magnets with the couple of holes
in them we’re gonna put one in the
furnace heat it up till it’s red-hot
take it out and then place the other
magnet right on top of it and see if it
makes any difference in how much
magnetism this gains back as it cools
down one of the square magnets is
heating up in the furnace we’ve got our
other square magnet and I want to see if
it’s attracted to this first magnet we
heat it up at this point
the first neodymium magnet we put in
there is still not being attracted to
the metal at all so I’m curious if our
fixed magnet here will be attracted to
that material even though it’s
attracted to steel that is a yes so the
bigger magnet that we put in first the
cylinder is not attracted to the metal
itself but another magnet is attracted
to the cylinder magnet that makes me
think we have eliminated all the
magnetism out of this magnet and it may
or may not come back let’s pull our
square magnet out of the furnace and let
it cool down in the presence of this
magnets not attracted to the tongs at
all okay currently not attracted much
maybe a tiny tiny charge let’s let those
cool down completely our magnets have
now had long enough to cool down and we
have nothing there is a very slight draw
it is really little but you just barely
feel it it’s not enough to lift the
magnet it’s just barely enough to feel a
tiny tug of resistance all right well
let’s see about our magnets cooled down
together a little bit to that steel
almost nothing
[Music]
oh this magnet got ruined so we have
really depleted these magnets of their
charge but a non depleted magnet is
still very attracted to both of these
we’ve got our miniature arc furnace
which gets well hot enough to melt
pieces of steel and almost certainly
these magnets as well first we’re gonna
melt down a piece of mild steel and see
if there’s any magnetic attraction to it
I kind of doubt it since it does seem to
lose its magnetic attraction once it’s
glowing orange but we’ll see what
happens we’ll give it a try and we’ll
even let it cool down somewhat in the
presence of a magnet and see if that can
magnetize the steel itself steel has a
tendency to spark quite a bit when it’s
melted in this hot so I’m gonna be doing
this with the lid on the furnace to do
our testing we’re gonna have a magnet
stuck on the end of our steel bar once
it’s melted down we’ll carefully remove
the lid and see what happens if we bring
I would say that is not attracted to it
at all
well I was exciting all right that is
starting to cool down and I’m just
leaving this magnet near it it could be
that the heat from the molten steel is
just gonna ruin the magnet oh well I
think the heat is winning my magnet just
slid right off of my steel bar I think
[Music]
our steel hedges really solidly attached
itself to our fire break here that is a
new still powerfully magnetic magnet I’m
gonna take our trend of steel let it
cool down in the water right next to
that magnet chunk of steel cooled down
next to a magnet it already ruined the
magnetism of the first magnet cooled
down even further in the presence of a
second magnet has it gained any magnetic
properties of its own hmm I’m gonna say
not so much well let’s move on let’s see
what happens if we just melt down a
magnet that is a super bright man holy
cow that is giving off a lot of light
like a lot huh the inside is molten my
think it was about 1,400 degrees
Fahrenheit and this was definitely
getting hot enough to melt the steel
which melts at about 2500 degrees
Fahrenheit but the magnets were not
melting as easily as the steel so
something about the alloy of the
composition clearly melts at a fairly
high temperature as a final test I want
to see what happens if I try and melt
there is some melted ferrite magnet
cooled down fairly quickly it doesn’t
like to stay liquid and kind of hard to
direct the arc right at it because as it
heats up like it did in the other
furnace it just kind of shatters and
goes everywhere so it doesn’t like to
stay in one place to be heated up nicely
but it does melt and like all the other
magnets we’ve tested as it melts it it
really loses all of its magnetic power
no longer attracted to steel melting
metal and magnets really does seem to
ruin the magnetism that they have in
them the magnets stop being magnetic
when you heat them up too much and they
don’t get it back after they cooled down
heating up steel while it’s over that
mark of about 1400 degrees Fahrenheit it
does lose all of its magnetic charge but
when the steel cools down it does become
magnetic again melting steel down into a
little blob I was hoping that we would
be able to put a magnetic field around
the steel but in putting the magnet
close to the liquid steel the magnet
actually heated up so much that it lost
all of its magnetic charge and it’s no
longer attracted to that piece of steel
or any other metal it’s just not a
magnet anymore it’s just a block of was
magnet I don’t know what to call that
maybe someday in the future we’ll try
melting down steel again and letting it
cool down in the presence of a powerful
electromagnet which shouldn’t have its
field ruined by the heat guys does not
all there is to see that box up at the
top will transport you directly to our
last video and you can go check that out
the box at the bottom let’s show you
what you tube things you need to be
watching next this bomb here in the
middle will subscribe you to the channel
so you never miss a video don’t forget
to ring that Bell and we will see you in the next one talk today
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