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Post by Deleted on Jan 11, 2014 6:03:53 GMT -8
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Post by matthewwalker on Jan 11, 2014 10:27:08 GMT -8
Thank you Karl, great stuff as always.
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Post by Robert on Jan 11, 2014 14:14:27 GMT -8
oh boy!!!
i knew the waterglass, but never read something like this.
am i understand this correctly, that we could use it for forming a rigid heatriser made of clay-perlite-silicate?
sounds also as a good idea for casting a core, isn`t it?
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Post by matthewwalker on Jan 11, 2014 14:49:58 GMT -8
Robert, that is exactly the mix I recommend in my cast core video from last year. I used furnace cement to provide the silicate. It works great, and I still believe it is one of the best materials to use to cast a core if commercial castable refractories aren't readily available.
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Post by Robert on Jan 11, 2014 16:36:05 GMT -8
yes. but i am not sure but it seems like we do not need the cement at all (or just a liitle bit of portland to start the reaction).
as far as my limited understanding goes, we can make a mix of PERLITE/SODIUM SILICATE only, and add CLAY to make it fireproof at 3200F which would be excelent for the heat risers...
just we would need to find out a special mix, and aluminium/magnesium content of clay...
Karl can you please confirm if i understand it correctly.
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Post by matthewwalker on Jan 11, 2014 18:43:42 GMT -8
Furnace cement is not cement, there's no Portland in it. I use it as an easy way to get sodium silicate into the mix.
My mix is essentially fire clay/perlite/sodium silicate.
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Post by Deleted on Jan 12, 2014 9:18:51 GMT -8
yes. but i am not sure but it seems like we do not need the cement at all (or just a liitle bit of portland to start the reaction). Quicklime could be used to start the hydration, for this quicklime is a part of cement. Fire clays have an high aluminium content. Soluble silicates can be used for: Binders for minerals like perlite or vermiculite. Rigidizer for fibers. Making mineral foam. I have added some more info at the top |
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Post by Robert on Jan 12, 2014 9:25:36 GMT -8
Karl thank you so much...
It seems like we should have a quite strong and durable highly insulative heat riser made out of this mix... my friend suggested also adding some bazalt fibres for giving it the more strenght...
And one question do we need some special treatment after making a mix, like firing it in some sort of a kiln? or we can just pack the form for the riser and fired it up and burn it in the stove it self?
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Post by Deleted on Jan 12, 2014 9:49:37 GMT -8
Karl thank you so much... And one question do we need some special treatment after making a mix, like firing it in some sort of a kiln? or we can just pack the form for the riser and fired it up and burn it in the stove it self? Between 800-900 °C, 1472 - 1652 °F sintering begins. ttp://www.ceramicartdaily.net/PMI/KilnFiringChart.pdf By just firing it up only the inner part of an insulating riser will be sintered. At low temperatures hardening can be achived by hydration. (quicklime) |
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Post by Robert on Jan 12, 2014 10:49:41 GMT -8
At low temperatures hardening can be achived by hydration. (quicklime) well, any idea of the desired proportions of clay/perlite/sodium silicate and quicklime? and how do you think, how long it will take to completely harden? i would like to give it a try. sounds much better solution then the vermiculite risers, which i do not think will last long. and what do you think about the idea of adding the basalt fibres for strenghening? |
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Post by Deleted on Jan 12, 2014 11:09:17 GMT -8
and what do you think about the idea of adding the basalt fibres for strenghening? I do not think it is heat resistant enough for a riser. |
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Post by Robert on Jan 12, 2014 11:30:25 GMT -8
any idea of the desired proportions of clay/perlite/sodium silicate and quicklime?
and how do you think, how long it will take to completely harden?
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Post by pinhead on Jan 13, 2014 6:10:28 GMT -8
I wonder if you could sinter the entire riser by building something that puts out a LOT of heat -- like a Peterberg batch box -- open to the air, burning full-out, with a radiant barrier around the outside of the riser...
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Post by ronyon on Jan 18, 2014 23:24:48 GMT -8
I have been looking into easy sources of sodium silicate. From a brewing forum I discovered that many things marketed as TSP subsitute were all or mostly made up of Sodium Metasilacate.
I think this would work, and the price is right.
Red Devil Tsp has a MSDS that states it is 100% Sodium Metasilacate.
I also considered basalt fibers, but didn't pursue discovering their thermal properties as I haven't found them locally. Rockwool is available locally and the thermal properties are pretty good for this application.
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Post by Deleted on Jan 19, 2014 5:39:36 GMT -8
Red Devil Tsp has a MSDS that states it is 100% Sodium Metasilacate. Sodium Metasilacate Hydrates disolve better than Anhydrous Sodium Metasilacate. Likely Red Devil Tsp is hydrated Sodium Metasilacate. There are four forms of Sodium Metasilacate Hydrates : Na2SiO3 9H20 Na2SiO3 8H20 Na2SiO3 6H20 Na2SiO3 5H20 As one can easily see the silicate content depends on the hydrate number. Na2SiO3.5H20 (Sodium Metasilacate Pentahydrate) has the highest content. See the PDFs at the top. More information on Sodium Metasilicate Pentahydrate www.pqcorp.com/Portals/1/docs/Metso%20Sodium%20Metasilicate,%202009.pdf You will have to dissolve it in water first. |
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