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Ceramics enter a new era with laser-welded joints

arstechnica.com

11–20 of 25 posts

Re: Ceramics enter a new era with laser-welded joints

#11

What sort of applications would this be used for? I see in the article housing electronics, but isn't plastic pretty good for that? Aren't ceramics super brittle?

Plastics don't work well in some environments, space and medical situations usually. This might make for some better (less bioreactive) and cheaper (instead of titanium) implantable devices. Plastics in space tend to have a few issues that I know of, off-gassing and UV degradation in particular.

Re: Ceramics enter a new era with laser-welded joints

#12
post #3

With the ability to weld glass to metal and now ceramic welding, the next 50 years are going to see a manufacturing revolution.

This seem to need very high precision and until you can hand weld it, it will have limited applications comparing to Steel

Re: Ceramics enter a new era with laser-welded joints

#13
For those wondering why this matters:

One reason is for electronics in extreme environments. Glass/Ceramics are more energetically stable than metals, so can withstand much higher temperatures. Think advanced sensors inside a rocket combustion chamber... while it is on.

Re: Ceramics enter a new era with laser-welded joints

#14
post #12
post #3

With the ability to weld glass to metal and now ceramic welding, the next 50 years are going to see a manufacturing revolution.

This seem to need very high precision and until you can hand weld it, it will have limited applications comparing to Steel

Steel is routinely welded robotically. There are a very large number of applications where this advance in materials science will make a very large difference, keep in mind that:

- ceramics are thermally quite stable (with respect to expansion/contraction)

- ceramics do not conduct electricity

- ceramics do not melt easily

- ceramics are hard; leading to excellent longevity

- ceramics are chemically very stable

This is a pretty major thing.

Re: Ceramics enter a new era with laser-welded joints

#16

What sort of applications would this be used for? I see in the article housing electronics, but isn't plastic pretty good for that? Aren't ceramics super brittle?

I'm thinking the ceramics would cancel lots of the electrical noise that electronics, and electrical components, put out. You can't have a very sensitive antenna if all the components in a receiver are spewing lots of electrical signals.

Making it possible for even smaller computers.

Re: Ceramics enter a new era with laser-welded joints

#17
post #12

Earlier quoted context omitted.

This seem to need very high precision and until you can hand weld it, it will have limited applications comparing to Steel

Steel is routinely welded robotically. There are a very large number of applications where this advance in materials science will make a very large difference, keep in mind that: - ceramics are thermally quite stable (with respect to expansion/contraction) - ceramics do not conduct electricity - ceramics do not melt easily - ceramics are hard; leading to excellent longevity - ceramics are chemically very stable This…

I agree with you that it's a big deal to be able to do it, but I am pretty sure it'll stay specialty and extremely expensive for a long time. Brazing is good enough for a lot of things after all, just not so much against corrosion or super high temperatures.

Re: Ceramics enter a new era with laser-welded joints

#18
post #12

Earlier quoted context omitted.

This seem to need very high precision and until you can hand weld it, it will have limited applications comparing to Steel

Steel is routinely welded robotically. There are a very large number of applications where this advance in materials science will make a very large difference, keep in mind that: - ceramics are thermally quite stable (with respect to expansion/contraction) - ceramics do not conduct electricity - ceramics do not melt easily - ceramics are hard; leading to excellent longevity - ceramics are chemically very stable This…

I wonder if this might be a possible step on the way to the "magic plumbing" that molten-salt thorium reactors apparently need?

Re: Ceramics enter a new era with laser-welded joints

#19

What sort of applications would this be used for? I see in the article housing electronics, but isn't plastic pretty good for that? Aren't ceramics super brittle?

I'm thinking the ceramics would cancel lots of the electrical noise that electronics, and electrical components, put out. You can't have a very sensitive antenna if all the components in a receiver are spewing lots of electrical signals. Making it possible for even smaller computers.

Thinking of it... Recycling of these computers will be challenging - how do you dispose an item made from "unobtanium" ?

Crush it into sand? It is one of the hardest materials, one needs a harder material to crush something. Heat/cool to have it crumble does not work well either with ceramics.

Melting it into glass or something? Might not be practical due to extremely high temps required.

Using it as "pebble" in road/bridge construction? Not sure if concrete will be able to stick to it.

Re: Ceramics enter a new era with laser-welded joints

#20

For those wondering why this matters: One reason is for electronics in extreme environments. Glass/Ceramics are more energetically stable than metals, so can withstand much higher temperatures. Think advanced sensors inside a rocket combustion chamber... while it is on.

I would add that there is a case for ceramic matrix composites in modern gas turbines. And this could also radically alter the ease of manufacturing for solid oxide fuel cells, which in addition to having extremely high combined cycle efficiencies (>80%), can natively use existing hydrocarbon fuel sources, as opposed to just pure hydrogen.
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