I need a glass with very low viscosity. The glasses which typically are used for glass works have very high viscosity at high temperatures. I want my glass to be as fluid as honey at 1000 Celsius.
In terms of oxide glasses, adding a large proportion of PbO gives very low viscosities, for example, try lead silicates or germanates or similar.
what sort of glass do you want ? silicate ? borate ? phosphate glasses ? as the fonction of network former Si, B, P, Ge and the alkali or earth-alkaline element, you can find different glasses....
Try a glass based on SiO2, Li2O, CaO and Na2O 60:10:15:15. This should have a low viscosity at 1000°C. However I cannot say whether this wil really result in a glass.
there are so many oxide glasses which melts at low temp below 1000 deg C....phoshate glasses have low melting temperature...bismuthate based glasses with Ge or lead containing glasses mostly have low melting temp...you will have 1 pas viscosity near 1000 deg C...
Everything from above, plus if you want a cheap solution, use sodium feldspar and add some lithium carbonate (10-15 %). On problems with cracks, add some borax.
I need my glass as cheap as possible, so I think that silica glasses are the best choice. I wanted to make my own batch but I was afraid that the composition I choose with high B2O3, Na2O, CaO, or PbO does not eventuate in a glass. Do you have any composition which definitely form a glass? (with the properties I need)
Look NS2 glass, 66%Si02-33Na2O all information are in my paper Chem Geol 2006 229 28–41
As all the colleagues mentioned, there are many possible compositional combinations to achieve < 1Pa.s at about 1000C. However, most of these low viscosity glasses will probably have poor chemical durability, high thermal expansion coefficient, etc...So, watch out for the intended application of this glass.
The best strategy, in my opinion, would be to simlulate some compositions using the SciGlass database/software tools.
Good Luck!
ED Zanotto (lamav.weebly.com).
Phosphate with suitable composition normally would produce glass with low viscosity. If you add Na2O to this, a glass with required viscosity may be obtained. However, understandably, these glasses exhibit poor chemical durability.
All alkaline phosphates exhibit low melt viscosity and very low (similar to water) in particular with potassium phosphate glasses can be prepared at a temperature of 800-850 ° C with very low viscosity. However the majority of phosphate have a low chemical stability.
Any composition with high percentage of MgO or CaO has to be given a special attention especially during quenching. If the supercooling rate is not fast enough, the glass may partially crystallize if not fully.
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