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A notable example is obsidian, a volcanic glass that fractures in a way that produces edges sharper than most metals can attain. Ancient civilizations utilized obsidian for crafting blades and tools due to its razor-sharp quality, which can be sharp enough to cut at the cellular level.
Well-crafted obsidian blades, like any glass knife, can have a cutting edge many times sharper than high-quality steel surgical scalpels: the cutting edge of the blade is only about three nanometers thick. [62]
A macuahuitl ([maːˈkʷawit͡ɬ]) is a weapon, a wooden sword with several embedded obsidian blades. The name is derived from the Nahuatl language and means "hand-wood". [2] Its sides are embedded with prismatic blades traditionally made from obsidian, which is capable of producing an edge sharper than high quality steel razor blades. The ...
This extends the life of the diamond blade which is used only when its superior performance is critical. [citation needed] Obsidian, a naturally occurring volcanic glass, is used to make extremely sharp surgical scalpels, significantly sharper than is possible with steel. The blades are brittle and very easily broken.
They are more homogeneous than stainless than other high alloy steels, having carbide only in very small inclusions in the iron. The bulk material is a little bit harder than standard stainless steel such as St-304 (high-end alloys excluded), allowing them to hold a sharper and more acute edge without bending over in contact with hard materials.
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The term is based on the word "whet", which means to sharpen a blade, [3] [4] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
Diamond knife blade. A diamond knife is a very sharp knife in which the edge is made from diamond, invented by Humberto Fernández-Morán in 1955. [1] [2] Diamond knives are used for medical and scientific applications where an extremely sharp and long-lasting edge is essential. The knives are very expensive to purchase, depending on the ...