I've had the Boker crystalized titanium chefs knife for about 3 years now, and use it constantly. Its an adequate knife with no "bad" features, but nothing that'll blow you away either. Other than the fact that it is light weight, but in a chef's knife thats not necessarily a good thing. The edge holding capabilities are marginal at best. I haven't died of botulism, so there may be something to the "anti-bacterial" claims, but I sort of doubt it.
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Crystalized Titanium?
- Thread starter nozh2002
- Start date
Dave, that makes a lot of sense, except in my memory the fat part of the glass in the bottom part of the individual window frames was bulged out over the frame and was thin again between the inside and outside framing. These were very old frames with wood inside and out, not just glazing. It looked like the glass was slowly flowing over the wood inside and out making it thicker there. It is possible that it was formed that way, somehow, but it just looks like it is flowing. Of course "they" also say the best arguement for evolution is that monkeys sort of look like people...
Thyen there's amorphous steel which has molecular bonds that resemble those of a liquid more than a metal, and a hardness and strength more than double the best ultra-high-strength conventional steels. ... In amorphous substances, the atoms are highly disordered. One example is window glass, which is more akin to an extremely viscous, immobilized liquid than a solid.
lambertiana
Gold Member
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- Jul 7, 2000
- Messages
- 9,248
As far as the argument about glass goes - my father is a PhD Ceramic Engineer who spent his entire career doing research for Corning Glass Works. He told me that glass is indeed an amorphous solid, in essence a supercooled liquid. I will take his word for it.
of course your dad's right.
glass is not a crystal because it does not have a crystal structure. it is composed of silicon and oxygen in tetrahedrons, but they are not linked together in any macroscopic structure. this allows silica to "flow" around each other and results in your windows bulging at the bottoms. hence, amorphous solid.
as for hardening of steels and other metals, hardness is related to how easily these macroscopic structures can be changed. usually, there is a small structure that is repeated throughout a metal (for instance, a cube that is repeated over and over,) but no matter what there are some discrepencies. where an atom should be, it is slightly off, or missing all together. there are several types of defects that can be present, from just an atom missing, to a whole line of atoms missing, to a whole plane. these defects are called dislocations, and they prevent the movement of the lattice. in general, the harder something is, the greater dislocation density it has. conversely, the more dislocations, the more brittle it is.
the "natural" hardness of a metal (excluding the effects of dislocations) has to do with the grain size of the metal. bigger grains results in a softer metal. grains are essentially these macroscopic structures oriented in different directions. a single crystal is one grain (or on macrostructure), while polycrystalline materials have many grains oriented in different directions.
the knife looks really cool, probably just a chemical etch... but it is interesting that it goes all the way through?
glass is not a crystal because it does not have a crystal structure. it is composed of silicon and oxygen in tetrahedrons, but they are not linked together in any macroscopic structure. this allows silica to "flow" around each other and results in your windows bulging at the bottoms. hence, amorphous solid.
as for hardening of steels and other metals, hardness is related to how easily these macroscopic structures can be changed. usually, there is a small structure that is repeated throughout a metal (for instance, a cube that is repeated over and over,) but no matter what there are some discrepencies. where an atom should be, it is slightly off, or missing all together. there are several types of defects that can be present, from just an atom missing, to a whole line of atoms missing, to a whole plane. these defects are called dislocations, and they prevent the movement of the lattice. in general, the harder something is, the greater dislocation density it has. conversely, the more dislocations, the more brittle it is.
the "natural" hardness of a metal (excluding the effects of dislocations) has to do with the grain size of the metal. bigger grains results in a softer metal. grains are essentially these macroscopic structures oriented in different directions. a single crystal is one grain (or on macrostructure), while polycrystalline materials have many grains oriented in different directions.
the knife looks really cool, probably just a chemical etch... but it is interesting that it goes all the way through?
- Joined
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Crystals and quantum mechanics aside, do note that the only knife Boker ever made for general distribution with this crystallized Ti alloy ( chef's knife ) was recalled for a rate of blade failure. Hopefully this knife has something new in the blade and not the leftover inventory of recalled blade material. Take care.