Knife with Sapphire Blade! (no metal)

Looked up a little one sapphire hardness etc. (http://www.timezone.com/library/itsabouttime/itsabout0010)

"It is important to note that in the literal sense, hardness is not synonymous with strength. Brittleness basically indicates how resistant the material is to plastic deformation. A very brittle material will, when placed under stress, break/fracture rather than bend. In the case of a sapphire crystal versus a glass crystal, the sapphire is considerably more brittle. As a result, a sapphire crystal is more likely to chip or crack than is glass counterpart if both are subjected to an equally hostile stress (banging, etc.)."

I doubt it is very useful.
 
That is a stupid article. And like non metal knives are new, what about Bokers ceramic ones, or there are all sorts of plastic, G10 carbon fiber, let alone alloys like 6K or titanium for "terrorists" to sneak around with. Sheeple are stupid.
 
Sharp yes, but how well does it baton that log? :D

O Cliiiiiifffffff....
 
And like non metal knives are new
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Yeah, more like they were around long before humans invented metal blades of any sort. Neolithic man used many sorts of nonmetallic material for blades, obsidian and flint being the most common.
 
Well, glass is a pretty broad range of materials with a wide variety of toughness.

I wasn't able to find specific charpy numbers for sapphire, but I did see where Kyocera is making hip prosthetics and dental implants from sapphire, which would imply but not confirm a reasonable amount of toughness.
 
Listen to that cry baby wussy sheeple who wrote that article. Those people make me sick:barf: ''Oh no, the ''terrorists'' are gonna get us all with saphire knives"":jerkit:
 
But if I put myself in a terrorist's shoes, I would think it'd make a really nice airplane knife. Who cares if it isn't that tough? It's sharp, and that's all I'll need it to be. Box cutters (which are similarly sharp and not so durable) were used to hijack the planes used in the 9/11 attacks, so airport officials are now more careful watching out for box-cutter-like devices on X-ray scans of hand-carry luggage.

An airplane-crashing knife doesn't have to be tough at all. After you don your red bandana, all you gotta do is cut the throat of the nearest infidel you can grab. The rest will cower in fear as that one bleeds to death, cause you and your buddies' scary sharp sapphire knives are better than anything they have on hand.
 
The best way to prevent that scenario from happening to you, is of course to bring your own sapphire-bladed pointy. If enough passengers have them, those terrorists don't stand a chance!
 
It doesn't matter how deadly a weapon is on an airplane. It just has to scare people, since apparently in virtually all instances in 9/11, no one resisted...a guy with a box cutter wouldn't stand a chance against the huge numbers on a commercial jet, and people probably wouldn't even get killed resisting (a real possibility, of course, but a box cutter just can't penetrate that far...).

My point is, I don't think the passengers would know what a sapphire knife was enough to be intimidated. It'd just look like a glass thingy.

You see, glass thingies have been around for awhile, broken pieces of glass for instance, and as far as I know, haven't downed any aircraft...

As per the sheeple response, I think we're not seeing it for what it really is. It has nothing to do with the composition of the knife, that is a side issue. The core is that this author views all knives as offensive weapons, and sees a specialized offensive purpose for this one. I can't know for certain, but if I were to ask him what he thought of my Spyderco Dodo, I'll bet he'd be appauled that I'd carry a knife made to take out hundreds of people at a time. If I showed him a purple minigrip instead, he would probably say it was a cute tool for opening boxes.

This sounds strange at first, but when you consider the facts, makes perfect sense.

First off, we know that only black knives can deal serious wounds--if the blade is black, the wound is usually twice as deep.
Also, we know that balisongs and automatics are so powerful they can take out five men with only one cut.
However, knives in pink or purple are usually harmless, offering no more than a papercut. If it says "Swiss" on it, it becomes like child safety scissors.
 
Gabe Newell said:
Well, glass is a pretty broad range of materials with a wide variety of toughness.

I wasn't able to find specific charpy numbers for sapphire, but I did see where Kyocera is making hip prosthetics and dental implants from sapphire, which would imply but not confirm a reasonable amount of toughness.
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I doubt you will find charpy numbers. The scale probably doesnt go low enough. Some of the newer stuff is pretty impressive, but I think in general, ceramic and glass toughness is measured differently. Oh, and just to be picky, glass doesnt have crystals. I'm sure most here know that, but a few might not.
 
Artfully Martial said:
It doesn't matter how deadly a weapon is on an airplane. It just has to scare people, since apparently in virtually all instances in 9/11, no one resisted...
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Uh, that's because people couldn't see the future and didn't know they were going to be crashed into buildings. As soon as the one flight learned about their fate they fought back. Now that we are all aware of what can happen people are not going to sit scared and watch someone brandish a knife, they will jump the guy and beat him to death if needed.
 
haHA I need no sapphire knife for flying! I'll just take my flint knife off the wall that was made by Indians 10,0000 years ago. (give or take a few) let the terrorists pull the sapphire I'll pull the flint.
 
me2 said:
Oh, and just to be picky, glass doesnt have crystals. I'm sure most here know that, but a few might not.
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yes its an amorph material (liquid), similar to liquid metal (which i heard makes fairly good blades).

all ceramics are brittle, just drop a sharpmaker rod on the ground and you will see, however they can be very strong, a regular blade needs both toughness and strenght. ceramics are not suited as knifematerial as it is now at least, maybe in the future.

as for taking ceramic blades on planes, forget it, the xray-machines "see" materials with high density, may it be glass plastic steel or whatever, the see it easily, so this is a nonissue.
 
M Wadel said:
yes its an amorph material (liquid), similar to liquid metal (which i heard makes fairly good blades).

all ceramics are brittle, just drop a sharpmaker rod on the ground and you will see, however they can be very strong, a regular blade needs both toughness and strenght. ceramics are not suited as knifematerial as it is now at least, maybe in the future.

as for taking ceramic blades on planes, forget it, the xray-machines "see" materials with high density, may it be glass plastic steel or whatever, the see it easily, so this is a nonissue.
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only thing is they XRAY your carry on and luggage maybe. They don't XRAY people. So I could hide a non-metal blade on my person and walk through the metal detection with no problem I would think.;)
 
DaveH said:
They are beginning to "image" people though.
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i guess these machines can see through anything, since they are more advanced than regular x-ray-machines. i wouldnt worry about ceramic knives when i fly, i would worry alot more about stolen missiles, bombs and such, however not even that is likely to happen imo. a ceramic knife would probably snap very quick if you stabbed someone, so its onetime weapon, useless imo. no need to worry there.
 
DaveH said:
They are beginning to "image" people though.
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I've flown many times since 9/11 and they only XRAYED my carry on and made me walk through a metal detector. I could have had any sort of non metal weapon taped to my body and they would have never known it. :eek:
 
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