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Post by photoman290 on Apr 27, 2014 14:15:42 GMT -8
has anyone ever used molddable ceramic blanket to make a burn tunnel core? don't know the price but looks ideal for making a molded j tube core. there are other manufacturers but this one has a pdf of the method. www.zrci.com/zrci030.pdf |
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Post by Deleted on Apr 28, 2014 3:10:30 GMT -8
Wet felt is only suitable for insulation, not for the actual core. For the actual core you need to look for plastic mouldable refractory or refractory ramming mixes. Wet felt consists of ceramic fiber blanket saturated with a liquid rigidizing solution, which can be purchased separately. Saturate fiber blanked and you have some. With price www.fusionglassblowing.com/index.php/Mold-Making-Refractories.html |
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Post by Daryl on Apr 28, 2014 4:58:43 GMT -8
Wet felt is only suitable for insulation, not for the actual core. For the actual core you need to look for plastic mouldable refractory
or refractory ramming mixes.
Wet felt consists of ceramic fiber blanket saturated with a liquid rigidizing solution, which can be purchased separately. Saturate fiber blanked and you have some. With price www.fusionglassblowing.com/index.php/Mold-Making-Refractories.htmlI am very new to this so please forgive my naive questions. Is the moldable refractory cement the same as the mixes that everyone is doing? Can the putty substance, which I have looked up quickly online, be used for a core? |
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Post by Deleted on Apr 28, 2014 5:39:45 GMT -8
Is the moldable refractory cement the same as the mixes that everyone is doing Industrial solutions are certaintly not the same as the mixes that everyone is doing. However, the mixes that everyone is doing may be able to do the job. Maybe, if the service temperature is high enough. Mouldable means too viscous to be castable from paintable over putty-like to kneadable, rammable. |
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Post by Daryl on Apr 28, 2014 6:01:27 GMT -8
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Post by Deleted on Apr 28, 2014 6:51:38 GMT -8
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Post by photoman290 on Apr 28, 2014 10:02:22 GMT -8
after a search i seem to have found that the rigidiser used is colloidal silica. seems fairly cheap so will get some and some ceramic blanket and see what happens. cant find any info on the temperature colloidal silica will be stable to. the ceramic blanket is viable to 1500C
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Post by satamax on Apr 28, 2014 11:28:30 GMT -8
after a search i seem to have found that the rigidiser used is colloidal silica. seems fairly cheap so will get some and some ceramic blanket and see what happens. cant find any info on the temperature colloidal silica will be stable to.
the ceramic blanket is viable to 1500C Plenty godunov i'd say!  |
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Post by photoman290 on Apr 28, 2014 13:15:54 GMT -8
found a paper saying colloidal silica is stable up to 1250C after that it forms cristobalite. think in laymans terms that means it turns glassy,but don't quote me on that. certainly sounds like it is worth experimenting with at least. i was thinking a thin layer of refractory castable followed by a layer of wetted fibre blanket followed by a layer of normal dry ceramic blanket may make a good light core and riser. cost should be about the same as using vermiculite board but should be lot stronger. of course it could all end in tears. but i will do the experiment first and find out. take me a couilpe of weeks to get the money together for the bits though,so if anyone else wants try it first go ahead, i am not proud.
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Post by Robert on Apr 29, 2014 1:20:52 GMT -8
Is colloidal silica same with water glass??
I used recently a ceramic fibre balket with a ridgidizer to form a riser, and it looks quite fine. At the begging phase of burning there was some foamy stuff coming out on the surface but it was only once when i started the fire for the first time.
But i am wondering wheter instead of a ridgidizer i could just use a waterglass? It is much cheaper.
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Post by photoman290 on Apr 29, 2014 2:06:16 GMT -8
seems there are quite a lot of differences viscosity being the biggest in our application. found this after a quick google. www.akzonobel.com/colloidalsilica/silica_facts/questions_and_answers/i assume you are referring to brought ceramic blanket? if colloidal silica does work it is much cheaper than buying the soaked blanket. plus i cant seem to find it in small quantities here in the UK. seems to have a lot of different names. in the UK moist felt seems to be the name it goes by. i can only get it on special order with a minimum order of 100 pieces. |
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Post by Deleted on Apr 29, 2014 3:33:51 GMT -8
Colloidal silica is formed during acidification of water glass by polymerization.
One could use ( acidified ) water glass as a rigidiser instead.
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Post by photoman290 on Apr 29, 2014 8:04:53 GMT -8
here is a paper on a method of making colloidal silica from sodium silicate(water glass) i have found 30% colloidal silica at £5 a litre. not sure about what the percentage need to be but it seems cheap enough for an experiment. i have managed to get someone to send me a sample of moist felt to experiment with. will report back with the results.
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