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materials for very high temp.

  • Thread starter Thread starter ipotemusa
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ipotemusa

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Um, I have a problemone.
in a "machinery" of my client we reach 800 / 1200 °c in operation, and the "beaker" in aisi 310 is quickly twisted.
I have no experience on these temperatures, what materials can be used?
then I should put a bearing that reggas this saddle, but there is nothing commercial; I had rated the vespel but at 500° carbonizza, go of ceramics? but I don't know any material sti....
Before I googlare, I wanted to have some info.
:redface:
 
ipotemusa said:
Um, I have a problemone.
in a "machinery" of my client we reach 800 / 1200 °c in operation, and the "beaker" in aisi 310 is quickly twisted.
I have no experience on these temperatures, what materials can be used?
then I should put a bearing that reggas this saddle, but there is nothing commercial; I had rated the vespel but at 500° carbonizza, go of ceramics? but I don't know any material sti....
Before I googlare, I wanted to have some info.
:redface:
Click to expand...
Wow. .
If you help 310s go into crisis it starts to be serious.. .
test aisi 321.
otherwise we have been experimented with inconel, but the results have been quite contrasting
 
I don't know if it can do for you.... there are refractories that can be "spruled" and reach a few cm thick, for the bearing instead I don't know.
 
1200°c are not "high". ..all that of metal must be to do with temperatures between 1500°c and 1700°c typically makes of copper with a good recirculation of water inside.
attention, of course copper melts at 1100°C, do not try to do so without cooling.

depends also on the stresses, copper is rather soft, for against steel it is rather difficult to cool.
 
418 stainless steel is specific for high temperature of 900 °C (smoke output of a turbogas) has no particular probe of expansion or loss of rigidity.

cost a little:redface:
 
Fulvio Romano said:
1200°c are not "high". ..all that of metal must be to do with temperatures between 1500°c and 1700°c typically makes of copper with a good recirculation of water inside.
attention, of course copper melts at 1100°C, do not try to do so without cooling.

depends also on the stresses, copper is rather soft, for against steel it is rather difficult to cool.
Click to expand...
bhe, that's the solution. . .
but I assumed it could not cool. . .
 
There is also another solution, but just as philosophical speculation because I do not believe it is applicable in your case, and however not simple or economic.

the problem arises with the palette of hypercritical turbines, high temperature, high centrifugal force, very small lasco with the stator and creep that makes it the master.

the palettes have small holes designed by the greatest gurus of fluid dynamics. in these forellini is pressed air that forms a film around the shovel, which is extremely insulating and cooling.
 
Fulvio Romano said:
There is also another solution, but just as philosophical speculation because I do not believe it is applicable in your case, and however not simple or economic.

the problem arises with the palette of hypercritical turbines, high temperature, high centrifugal force, very small lasco with the stator and creep that makes it the master.

the palettes have small holes designed by the greatest gurus of fluid dynamics. in these forellini is pressed air that forms a film around the shovel, which is extremely insulating and cooling.
Click to expand...
Nice solution. . .
But I think it's a little too technological. . .
 
MBT said:
Nice solution. . .
But I think it's a little too technological. . .
Click to expand...
thanks to all:
then, at present it cannot cool, at least not with the current limits of the machinery already performed.
I have dimensional constraints, and I was discarded a priori of the substantial changes I had proposed.
I would say that the tree of this "beaker" could also cool, but the palettes no, would be too complicated and expensive and incompatible with the required dimensions (slims x limit the power)
The only solution that seems to me feasible is to change materials, but I think it will solve little, "over" at aisi 310 is not that there are so many possibilities, at least I did not find them.
They insist with the hypothesis of ceramics, but I don't think you can make a diam tree 35 along a metre, with keystrokes and various holes, forget if it is possible (according to me it breaks, it's almost all over again).
 
ipotemusa said:
thanks to all:
then, at present it cannot cool, at least not with the current limits of the machinery already performed.
I have dimensional constraints, and I was discarded a priori of the substantial changes I had proposed.
I would say that the tree of this "beaker" could also cool, but the palettes no, would be too complicated and expensive and incompatible with the required dimensions (slims x limit the power)
The only solution that seems to me feasible is to change materials, but I think it will solve little, "over" at aisi 310 is not that there are so many possibilities, at least I did not find them.
They insist with the hypothesis of ceramics, but I don't think you can make a diam tree 35 along a metre, with keystrokes and various holes, forget if it is possible (according to me it breaks, it's almost all over again).
Click to expand...
risk that you break through heat shock as soon as you immerse it, let alone with the above stresses.. .

But what do you have to shake? How? Can't you think of increasing the size of the palette while maintaining the same penetration coefficient?
 
Fulvio Romano said:
risk that you break through heat shock as soon as you immerse it, let alone with the above stresses.. .

But what do you have to shake? How? Can't you think of increasing the size of the palette while maintaining the same penetration coefficient?
Click to expand...
I would say that thermal shock is not a problem, it is always "immersed" and the temperature grows and drops slowly.
this agitator turns to 12/15 rpm, therefore very flat, and stirs wood/carbonella to pieces
 
you might think of using some ceramic coating instead of using a ceramic material. . .
 
pecos said:
you might think of using some ceramic coating instead of using a ceramic material. . .
Click to expand...
at regime the temperature is always the same, even putting ceramics, it takes only more time. at that point the steel deforms, and the ceramic that is rigid breaks.

I would do wide blades, like fans. should easily penetrate the mass, have a huge inertia in the sense of rotation, and the effect they would have would be to lift the material more than to circumferentially move it
 
so much to add a further opinion to the many valid already expressed, I would say that if the refractory steels of common use do not suffice (if you can soften the aid 310s is a tough race), before landing to the ceramic (which as already said is a little fragile) I would recommend to take into consideration special refractory steels such as those at the vanadium or tungsten, or just at the limit the superleghes to the base of the
I'm sure a good supplier of special steels can find the most advantageous solution.
 
you are sure of the operating temperature and the impossibility to cool I imagine, sorry but I would like to understand well if at 1200°c is a transition or how long it is to stay at that temperature. I know that you have already reiterated but I ask you why 800°c is one thing, 1000°c another but at 1200°c any type of steel is in a state of complete re-crystallization, there are no more neither hardening mechanisms for deformation nor for precipitation nor for heat treatment they hold. You have no hope of getting away with the steels at those temperatures.
sure, if you use a coating treatment of those of some cm as maurom said (in specific ni/w alloys, different from ceramic coatings, or even a multilayer with tbc), with a base steel h13 all is possible... but you come to cost so much that in the end you really want to change material.

I would say that a solid base nickel is more than guaranteed, without uncomforting tungsten or other refractories that are for still higher temperatures. . hastelloy type x or even inconel 600 or 601, in substance quoto zeffiro62!
 

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