lst
New Member
Posts: 13
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Post by lst on Jul 8, 2018 1:37:43 GMT -8
Hi all,
I know the limitation of using metal for the heat riser (namely the fact it consumes itself/flaxes away over time due to high temp, low oxygen).
I was wondering if a liquid glass (Sodium Silicate) coating on the inside of a metal heat riser could protect it against the chemical degradation over time.
Has anyone tried or has anyone an educated guess of how it would work?
Thanks to all for the suggestions.
çST
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Deleted
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Post by Deleted on Jul 8, 2018 5:26:30 GMT -8
Liquid glass is not chemically stable and will combine with CO2 to disintegrate back to its original constituents of silica dioxide, SiO2 and sodium carbonate, Na2CO3. Liquid glass needs to be combined with a reactive alumino silicate to become chemically stable. |
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lst
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Post by lst on Jul 8, 2018 7:08:14 GMT -8
Hello Karl, thanks a lot for your informative reply.
Do you know if there is any tutorial around to replicate those Geopolymers? Or is there a commercial product ready to use to coat metal heat risers?
I ruled out just mixing Sodium Silicate with and refractory cement to coat the riser because it looks to me unlikely that the materials stick to the metal for long.
I would like to build something that should last a long time without being able to do any maintenance on it.
Thanks again.
LST
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lst
New Member
Posts: 13
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Post by lst on Jul 8, 2018 23:38:06 GMT -8
Hello Karl,
sorry to bother again. I am exploring different possibilities.
I have seen that Sodium Silicates could be used as a binder/stiffener as well.
I was wondering if one could build a riser out of ceramic fiber mats soaked in the liquid glass.
Do you think it would be a long-lasting solution?
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Deleted
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Post by Deleted on Jul 9, 2018 4:08:36 GMT -8
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serg247
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The mountain can not be conquered, it can allow it to ascend...
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Post by serg247 on Jul 9, 2018 4:33:40 GMT -8
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lst
New Member
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Post by lst on Jul 9, 2018 23:34:08 GMT -8
Thanks a lot Karl, very informative. Would you be able to point me to some source that explains in layman terms how to mix ceramic fibers (or high alumina clay) with liquid glass to get a thermally stable compound? Thanks again for your help. |
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lst
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Post by lst on Jul 9, 2018 23:34:55 GMT -8
Thanks a lot Serg247, interesting read. I like those experiments very much. Best |
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Deleted
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Post by Deleted on Jul 10, 2018 9:33:03 GMT -8
Have a look at: Basic Kaolinite Clay Geopolymer Chemistry donkey32.proboards.com/thread/3287/basic-kaolinite-clay-geopolymer-chemistry. Glomax LL Calcined Kaolin is sold per lb at many pottery supplies. Calcined Kaolin is much more reactive than natural kaolin. Kalcined kaolin Al2Si2O7 + 2 SiO2 + 2 NaOH = 2 NaAlSi2O6 + H2O Al2Si2O7 + SiO2 + Na2SiO3 = 2 NaAlSi2O6 Al2Si2O7 + 3 SiO2 + Na2SiO3 = 2 NaAlSi3O8 Natural kaolin Al2Si2O5(OH)4 + 2 SiO2 + 2 NaOH = 2 NaAlSi2O6 + 3 H2O Al2Si2O5(OH)4 + SiO2+ 2 Na2SiO3 = 2 NaAlSi2O6 + 3 H2O Al2Si2O5(OH)4 + 3 SiO2 + Na2SiO3 = 2 NaAlSi3O8 + 2 H2O |
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lst
New Member
Posts: 13
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Post by lst on Jul 10, 2018 23:28:12 GMT -8
Have a look at: Basic Kaolinite Clay Geopolymer Chemistry donkey32.proboards.com/thread/3287/basic-kaolinite-clay-geopolymer-chemistry. Glomax LL Calcined Kaolin is sold per lb at many pottery supplies. Calcined Kaolin is much more reactive than natural kaolin. Kalcined kaolin Al2Si2O7 + 2 SiO2 + 2 NaOH = 2 NaAlSi2O6 + H2O Al2Si2O7 + SiO2 + Na2SiO3 = 2 NaAlSi2O6 Al2Si2O7 + 3 SiO2 + Na2SiO3 = 2 NaAlSi3O8 Natural kaolin Al2Si2O5(OH)4 + 2 SiO2 + 2 NaOH = 2 NaAlSi2O6 + 3 H2O Al2Si2O5(OH)4 + SiO2+ 2 Na2SiO3 = 2 NaAlSi2O6 + 3 H2O Al2Si2O5(OH)4 + 3 SiO2 + Na2SiO3 = 2 NaAlSi3O8 + 2 H2O Awesome. Thanks a lot |
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