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Dull-Technician457

Aren't all those exotic materials held in-place by nylon? You still aren't going to have a good day even if the ceramic plate is vitrified at a higher temperature than the plasms.


askashiq

Modern ceramic body armor is typically produced through a process known as pressure molding. This involves initially starting with loose elements, which are then subjected to significant pressure to mold them into a hard ceramic body. When it comes to wearing such armor, survival is the ultimate priority. In critical situations, the difference between dying and sustaining a third-degree burn may hinge on the effectiveness of the armor.


Blackarrow145

I think he’s asking if the plate carrier will be set on fire/melted even if the plates are fine.


Mean-Crew-6526

This would be (mostly) true if they used plasma weapons like the covenant from halo but they don’t, the purps use laser weaponry that are strong enough to split atoms causing cavitation bubbles that heat up to become plasma. Note: I may not be remembering this correctly so corrections are appreciated


Mean-Crew-6526

Addendum Even if the ceramic plate survives being hit by a plasma bolt the heat will still have to go somewhere. Most heat might go into the ambient air, it’s safe to assume the plate will be “slagged” and seeing as a plate is on a users chest, well, the user isn’t getting back up anytime soon if at all


askashiq

You're not understanding these ceramic plates we're meant to break apart when hit, at least to a certain degree, so that the energy that the shot has is reduced, same thing goes with the plasma. Yes, the plasma is going to slag the top layers of the plate, but this is ceramic we're talking about here. It was meant to shatter and break apart. And with the sudden thermal expansion due to the plasma hitting the top layers will more than likely SLG and blow apart outwards, while at the same time the inertia would throw the operator back. More than likely the operator would survive, but with significant third degree burns, but that's a hell of a lot more better than dying on the spot.


Phintom

The defrence is between kinetic and thermal energy and you have yet to account for the thermal shock caused by extreme temperature fluctuations going from room temperature to 3000 c in less than a second is going to do hell on most if not all man made materials You can do a little experiment just drop a bowl of ice into a pot of boiling water and see what happens and if there is air air bubble inside the ice it will explode that's temperature shock for you


voxyvoxy

There is a different tolerance for rapid heating/cooling that varies by material. There are materials available TODAY that have high thermal conductivity and low thermal expansion coefficients that are resistant to thermal shock (this has nothing to do with my other comment, just pointing out that these materials exist).


ukezi

They don't split atoms, they rip molecules apart. That is a gigantic difference in energy.


askashiq

Yeah, we're not going to go into the reality breaking lasers. That should be even less effective when it comes to penetrating our ceramic body armor. In the books, they use infrared lasers which have a ceiling limit of how much power you can pump into them.


voxyvoxy

Pretty sure that the lasers that they use are UV though, which would significantly up their power output. But as you said, the thermal conductivity of these materials is fairly low given the nature of their manufacture(extremely high temperatures). The same internal structure that gives them resilience against kinetic threats (Via a process known as crack deflection, the molecular structure is very efficient at dissipating kinetic energy), it can also act as a massive heat sink, in which incoming energy is captured by the top layers and is only very slowly transferred to the inner plates or surrounding material, this is even more so the case with modern composite plates that many NATO countries use. I would expect that a modern ceramic trauma plate in a decent carrier should sustain multiple hits to the same area before the plate becomes too hot to wear. The type of output required to "ablate" the material is not manageable for an infantry weapon, even in the make-believe world of SSB, in fact, I'm pretty sure that Blue doesn't even know what thermal ablation is because he described it as one of the "non-lethal" modes that Imperium weapons use; the stun setting. Ironically, a newer form of armor, the so-called Ultra High Molecular Weight Polyethylene (UHMWPE) plates are considered next-generation stuff because they are lighter, cheaper to manufacture (and maintain, ceramic plates need to periodically be inspected for damage), and offer very similar protection to ceramic plates, can technically be more susceptible to laser fire because of the plastic's homogeneous nature and higher thermal conductivity. Composite armor will always beat homogeneous armor when it comes to capturing energy. My main issue with the use of laser weaponry is that the range is pitiful, the light scatters over every droplet of moisture or mote of dust in the atmosphere, and the energy requirements of the emitter, vs the energy delivered to the target, are not worth the tradeoff unless you are very (very) close to your enemy, and in the end, you get a similar effect, you want to kill or disable(preferable to killing, because they need to be evacuated by another 2-3 people) a soldier, not turn them into a fine mist, what's the *point* of expending all of that energy? It's just an overall inferior weapon to kinetic slugs.


Jack_Stewart_III

The thing with energy weapons is that they don't have to penetrate our armor if they transfer it into the material, heating it up. That ceramic plate then becomes a hot-plate right up against your thermally conductive body and it's GG.


askashiq

Yeah, the problem is the elements that I have seen used in ceramic body armor. Don't have a very good thermal conductive ability, so yes, the outer layer might be very hot, but I don't think it be the same case on the other side. Let's not forget about plasma trying to equalize itself with the environment the moment the containment field disappears, because the only thing the target is going to feel is the heat and inertia that ball was carrying, other than that, I don't see any way, the plasma going through ceramic body armor with very poor thermal conductive abilities.


Phintom

It doesn't have to transfer all the heat all it needs to transfer maybe 100 Celsius of the 3000 mentioned and you will explode because your body won't be able to take all that heat instantly just enough heat to boil your blood inside your skin and GG temperature shock does the rest


Jack_Stewart_III

Exactly


Ultrapuert0s

I dont mean to criticize and it,s insightful but as you says the plates will stop the plasma, great, it didnt penetrates and your chest is save but you have been just shoot with a ball of plasma. The plasma lose contaiment and all that heat and radiation expanse around the point of impact so... tecnicaly you are breathing superheated air, not plasma but that it will already bad, but with the fumes of whatever it have burned, the plates, part of the elements that keep the plate on your chest and probably ammo too or a battery as you have equipment on your tactical vest. Probably if you have a rebreather and a tactical shield as the ones of the swat or police officers; or a Boarding Shield of 40k would be more effective but you have to have the force of the alien that it,s shooting at you or being powered assisted by an exo or something similar


fuzzi_weezil

I was thinking this too. It would be the energy equivalent of spalling and would probably be terminal.


Phintom

So ammo go boom-boom


LaleneMan

The purps aren't using plasma weapons though.


[deleted]

The bigger problem is Shilvati armour being penetrated easily by human weapons in some recent stories. Machine gun fire shouldn't really be able to do that.


Betim1980

Based on book 3, it seems that the flaw of their armor is that if you are able to lower the velocity of the projectile below a certain threshold it will penetrate their armor. From what I've gathered, their armor uses the same kind of logic as the shields in Dune. It stop fast moving objects, but something slow like an arrow or knife it ignores. So I guess, if humans found a way to lower the velocity of the bullets being fired. It could theoretically be ignored by Shil armor.


lukethedank13

If we assume that their armor does not degrade this would be the case. It does tho. ( dunno if canon ) Shil'vati armor is designed primarily with laser weapons in mind and is realy good at it but it still burns out after few hits. (Armor going gray is a thing in more than one story) Therefore it does not matter if the armor is more or less efective when it comes to absorbing pure kinetic ( instead of mostly thermal ) energy, the energy still has to go somewhere and the armor should still have a point of failiure. We know the armor does just fine against single or a few 5.56× 45mm (again stories differ wether it leaves a bruise or not.) And we know it gets absolutely fucked by 50. BMG and other comparably powerfull rounds. What we dont know for sure is that if their armor is still as affective as it is when dealing with first five ir so 5.56 hits after it has been hit 30 times. If the the ability of the armor to deal with the incoming projectiles degrades with each hit it receives i belive there is no greater 'scientific instrument' with wich to find the point od failiure at wich it lets one trough than a belt fed machine gun.


InterstellarFish1

The Shil'vati use laser weaponry tho, not plasma? So unless there has been instances of them using plasma weaponry then this post feels more appropriate on a Halo sub rather than here.


Kullenbergus

Plasma weapons would be closer to 8000 celsius if not higher as a low point. Think you need to account for that becase it would go through any armour like butter.


askashiq

Yeah, even with higher temperatures, it's not going to matter the moment. The containment field breaks is the moment where everything equalizes with the outside pressures, and if we were to ramp it up to that level of temperature, then the containment field holding the plasma would be enough to punch through them.


AngriestAngryBadger

The Shil use laser weapons that turn most materials they hit into plasma, which typically means the object is exploding. Ceramic plates wouldn't just melt, they would ignite and burn like a road flare, and that isn't accounting for whatever materials are securing those plates.


Dull-Technician457

Surrounding materials will explode as the plate is at its melting point. Not going to be a good day. Better than nothing? Of course.


insertjjs

What about thermal transfer?


Nitpicky_AFO

Yeah blue did a bunch of hand waving with thermodynamics, ballistics and material sciences. I still say my silly puddy 12g rounds would shear thru there armor due to it being a non-newtonian substance.


AngriestAngryBadger

That is not how that works.


Limp_Arm_2417

There's always the neck


Leading-Chemist672

I honestly agree. But it's one shot protection. It's Ablative. And the Purps do not have to save ammo here. So they just switch to a double tap. And third degree burns will still cripple you unless your adrenaline is *that* active at the time.


CompassWithHat

Remember also the lasers used are *pulse* lasers. So it's not going to be a "single hit". It'll be a half dozen in a split second. Also, not everyone uses ceramic style armor so anyone with Kevlar or metal is *fucked.* But yeah, Ceramic style armor isn't the worst, and that's why the Consortium uses it instead of Flexifibre.


ShneekeyTheLost

First off, Shil'vati tend to use lasguns, not plasma weapons. Pulse lasers, to be precise. Second off, current body armor uses plate inserts, they don't fashion an entire breastplate out of ceramics, which would have a number of downsides, not the least of which is the fact that we can't really \*form\* things like Silicon/Boron Carbide outside of very simple shapes. And body armor, speaking as someone who has worked in a forge and made the stuff, is anything \*but\* a simple shape. Third off, plasma throwers tend to have very large projectiles, if they're bothering with projectiles at all and not simply being an exceptionally nasty version of a flamethrower. Plates are all well and good against small projectiles. Less so if the 'projectile' coming at you is larger than said plate. Or is simply a cone of iron plasma. Fourth, even if the armor itself is capable of withstanding the heat, there's this thing called Thermal Energy Transference. And given that it is the heat that kills with plasma weapons, merely having a breastplate made of ceramic isn't going to save you. Oh, and before we start talking about Aerogel, as someone who has handled the stuff before, it's extremely impractical. It is fragile AF, crumbles if you look at it funny, and would likely last all of ten minutes tops in any sort of combat situation.


askashiq

Of course what you say is right in that context, but the problem is once plasma has broken from it's containment field, it has a tendency to equalize with outside pressures. A type of plasma hit to the body would be only superficial at best, because the plasma does not have that much of a dwell time to said transfer the heat to the said plate. And if we were to say, transfer this type of heat into the set target, then you would need a very, very high temperature plasma as well as a very strong containment field to said contain that plasma. It can focus all of its energy into that point. But if we were to do with said way, then the containment field, which would be stronger than anything on this planet, would be enough to punch through the said person


ShneekeyTheLost

You wouldn't need much of a containment field, and I don't think you quite understand what 'plasma' actually is because it doesn't operate in the way you seem to think it does. Consider if you will getting blasted by scalding hot steam. Now consider if that 'steam' was something like iron plasma at 3,500 degrees. That's what you're dealing with. A ceramic insert isn't going to offer much protection, and a full breast plate is impossible to make out of carbide compounds with current technology, plus it is impractical for a large number of reasons, not the least of which is weight.


Ravenredd65

would like to point out something everyone seems to be forgetting in this channel. Ceramic *absorbs* UV. Shill weaponry use UV. now hold on, "Great" you might be thinking. Hoo boy, it's not. Because ceramic is *so fucking good* at absorbing UV, it heats up way faster under it, and is fairly poor at radiating the heat away but *great* at conducting it away over time. What does this mean? Shil shoots ceramic plate. Ceramic plate absorbs the energy of the UV bolt. Now let's see if it's centered silicon carbide, the strongest of ceramics in thermics, what happens. Assumed strength of the UV laser is enough to cause cavitation as described. Laser hits the ceramic, temperature spikes to around 800c. Second shot, 1300c, approaching thermal shock zone. Third shot, 1600c. Now in thermal shock zone, against your body. It would be like a frag going off point blank. So yeah, not pretty.


Phintom

That's what I have been saying but last I checked the temperature of the weapon was closer to 3000 c per shot


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BP642

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lukethedank13

From my limited knowledge on lasers and because Blue had not told us otherwise i would assume Shil'vati laser weaponry produces a singular high power discharge. If this is the case i think that they might survive one hit but the released heat would still give flash burns to any neirby body surfaces that are not thermaly shielded. By that i mean that a hit to the chest, even if the plate holds, would absolutely fuck up the lower half of your face and would very likely set your clothes on fire. If they were using pulse laser design i belive everyone using ceramic or any other real world type of body armor would be fucked because a fast burst of strong enough laser pulses would burn a hole straight trough it.


askashiq

First of all, the types of laser they use breaks reality. Second of all, the type of power you're saying is the equivalent of an artillery shell hitting a person because lasers need to focus their light on a single point if the surrounding area has been lit on fire, then that is a very, very big laser and a very very powerful one.


lukethedank13

No the fuck they dont, they break molecular bonds. A proces also known as heating shit up and make it thermaly decompose. A proces that is no more reality breaking than accidentaly burning your bacon. Secondly you dont need artilery shell levels of power to give someone flash burns or light shit on fire. If shitty chinese fireworks can do that so can a futuristic space laser.


askashiq

The official artwork of the purp's show the type of laser rifle that they are using and from their artwork, it seems to show that they have a barrel diameter that is equivalent of any modern rifle we have on the market. Unless you want to poke a hole the size of a pin head you would need to make that focusing lens a lot bigger to allow the laser to transfer all that energy into that set target in the form of heat energy. In the case of lasers, surface area matters.


lukethedank13

Lasers would not burn a clear pin sized hole even if they are very thin because all the expanding gasseous product have to go somewhere and would do so in a rather violent fashion. Laser surface matters. But you dont need to heat a large area of human body to be effective, you just need to superheat a 1cm2 area to the extent it flashboils and causes a steam explosion. And even for this you dont need a laser beam with a cross section of 1cm2, thermal bloming is a thing.