With the caveat that this is very much not my field (I just think it’s neat): I believe you wouldn’t see much of a benefit - they are different methods of achieving the same result (putting the surface of the glass under tension), and while chemically strengthened glass gives a more uniform result which gives greater strength, subsequently heat tempering that glass would likely not compound the effect. I also suspect that it would be exceedingly difficult to design a process where you could get the benefit of both techniques at once - chemically tempered glass requires a long cooling period, which is the inverse of the process to produce heat tempered glass.
Yep, prince rupert* drops are thermally tempered glass. As I understand it (again this is not my field, I just think it’s neat), prince rupert drops aren’t “frail” at any one point exactly - the long tails are just as strong as the rest, but because they have such a tiny cross sectional area (thus the force you apply isn’t distributed across a wide surface area) you’re able to overcome the strength of the glass. That’s why a failure there causes a cascade, because the force is otherwise evenly distributed throughout the whole surface. Because the glasses don’t have a similar feature where the cross section becomes miniscule, they’re not going to be significantly more or less frail at any one point.
Ah super cool! I worked as an engineer in an aluminum plant in the past, and I am always so blown away about how differently ceramics and metals behave.
With the caveat that this is very much not my field (I just think it’s neat): I believe you wouldn’t see much of a benefit - they are different methods of achieving the same result (putting the surface of the glass under tension), and while chemically strengthened glass gives a more uniform result which gives greater strength, subsequently heat tempering that glass would likely not compound the effect. I also suspect that it would be exceedingly difficult to design a process where you could get the benefit of both techniques at once - chemically tempered glass requires a long cooling period, which is the inverse of the process to produce heat tempered glass.
This is the idea behind a Prince Rupert Drop, yeah? So do the glasses have a point where they’re frail? Like the lip of the rim or something?
Yep, prince rupert* drops are thermally tempered glass. As I understand it (again this is not my field, I just think it’s neat), prince rupert drops aren’t “frail” at any one point exactly - the long tails are just as strong as the rest, but because they have such a tiny cross sectional area (thus the force you apply isn’t distributed across a wide surface area) you’re able to overcome the strength of the glass. That’s why a failure there causes a cascade, because the force is otherwise evenly distributed throughout the whole surface. Because the glasses don’t have a similar feature where the cross section becomes miniscule, they’re not going to be significantly more or less frail at any one point.
Ah super cool! I worked as an engineer in an aluminum plant in the past, and I am always so blown away about how differently ceramics and metals behave.