Welcoem to posts!!
in the future - u will be able to do some more stuff here,,,!! like pat catgirl- i mean um yeah... for now u can only see others's posts :c
Does anybody know how to setup this bad boi?
Will I need that ignitor or just connect to ballast and off you go?
Can I use hairdryer to cool the lamp?
Is it bad when this explodes? I guess welding helmet would be good enough safety gear right?
Aaaand will this be good for growing hydro peas? lol
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The yeld...
I guess I need smaller beaker lol
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Glassblowing stream in weekend - yay or nay?
Can not really promise, but can try to do something. Question is, if there is even anybody to watch :P
But I guess we'll see..
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Have been experimenting with techniques to create refractory ceramic. Originally I was aiming for formulation with CaSiO3, but accidentally created pourable mixture using only gypsum and Na2SiO3. I am not quite sure if reaction does create CaSiO3 as a result, but I guess it's quite likely + there is some other crap. Limited by Na2SiO3 melting point, at about 900-1000 deg C Na2SiO3 will start to wet ceramic and cracks may develop. No biggie tho.
Ceramic should contain quite a lot of trapped air bubbles, and should be extremely light when dry. Brittle, but not crumbly at least when not broken. Very good thermal insulating properties (got about 600 deg C dt at 15mm thickness to ambient. hard to calculate conductivity even with improv calorimeter).
Uses: Furnace lining, firebrick(not weight bearing), housing of heating elements
If anybody wants to try it out:
Mix Na2SiO3 ~34% soln, water and gypsum, ideally with vigorous mechanical stirring.
Pour into form and dry in oven at up to 100deg C
When dry, material will hold shape, but it will be very brittle. Soak in Na2SiO3 10-15% soln. when fully soaked, wash in running water for 20sec.
Dry in oven at up to 100deg C.
When dry, bring slowly up to at least 250deg C. Then you can fire at operating temp.
Drying is quite slow due to excellent heat insulating properties.
Here is the log finding the best ratio:
30g Na2SiO3
150g h2o
30g gypsum
quite watery and runny
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20g Na2SiO3
150g h2o
40g gypsum
very runny
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30g Na2SiO3
150g h2o
40g gypsum
pasty, but still runny
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30g Na2SiO3
150g h2o
50g gypsum
quite tixotropic, very similar to 3
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30g Na2SiO3
150g h2o
60g gypsum
pastyness increases, more bubbles are trapped
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20g Na2SiO3
75g h2o
30g gypsum
very firm, consistent like dough
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/////////////////////// Winner winner chicken dinner ///////////////////////
30g Na2SiO3
70g h2o
40g gypsum
Immediately hardens, completely non-flowing, must mix a lot to get somewhat workable consistency
Sample 1
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26g Na2SiO3
70g h2o
35g gypsum
Immediately hardens, barely flowing, must mix a lot to get workable consistency
Sample cracked during drying, and changed volume considerably
Sample 2
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30g Na2SiO3
70g h2o
35g gypsum
Immediately hardens, completely non-flowing, must mix a lot to get somewhat workable consistency
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17g Na2SiO3
70g h2o
63g gypsum
Too gypsum-y Na2SiO3 would have little effect
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52g Na2SiO3
70g h2o
40g gypsum
Immediately hardens to a solid
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dafuq is this
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General engineering stuff.
Chemistry, electronics, mechanical, DIY projects, and more.