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A material 400 times harder than diamond, the 12th Doctor spends 4.5 billion years in a confession dial in the episode "Heaven Sent", continually dying and being recreated, taking the aforementioned 4.5 billion years to make it out of the confession dial by punching through an Azbantium wall.
In the 2003 film The Core, [21] "Unobtainium" is the nickname of a 37-syllable long tungsten-titanium crystal alloy developed by Dr. Edward "Braz" Brazzelton that is able to absorb the extreme pressure and heat of the Earth's molten core and then convert these into usable energy; it's used in building the super resistant outer shell of the ship ...
The hardness of synthetic diamond (70–150 GPa) is very dependent on the relative purity of the crystal itself. The more perfect the crystal structure, the harder the diamond becomes. It has been reported that HPHT single crystals and nanocrystalline diamond aggregates (aggregated diamond nanorods) can be harder than natural diamond. [25]
Naturally occurring tungsten consists of four stable isotopes (182 W, 183 W, 184 W, and 186 W) and one very long-lived radioisotope, 180 W. Theoretically, all five can decay into isotopes of element 72 by alpha emission, but only 180 W has been observed to do so, with a half-life of (1.8 ± 0.2) × 10 18 years; [34] [35] on average, this yields ...
Heavy metals is a controversial and ambiguous term [2] for metallic elements with relatively high densities, atomic weights, or atomic numbers.The criteria used, and whether metalloids are included, vary depending on the author and context and has been argued should not be used.
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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Diamond is extremely strong owing to its crystal structure, known as diamond cubic, in which each carbon atom has four neighbors covalently bonded to it. Bulk cubic boron nitride (c-BN) is nearly as hard as diamond. Diamond reacts with some materials, such as steel, and c-BN wears less when cutting or abrading such material. [4]