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Camalot is a brand of spring-loaded camming devices manufactured by Black Diamond Equipment used to secure ropes while rock climbing. Camalots use a dual-axle system, resulting in a slightly higher expansion range than similarly sized single axle units, however that results in significant weight penalty. [1]
Its Vickers hardness (38 GPa), elastic modulus (460 GPa) [12] and fracture toughness (3.5 MPa·m 1/2) approach the corresponding values for diamond (1150 GPa and 5.3 MPa·m 1/2). [ 13 ] As of 2015 [update] , boron carbide is the third hardest substance known, after diamond and cubic boron nitride , earning it the nickname "black diamond".
Black Diamond Equipment's history dates from the late 1950s, when climber Yvon Chouinard began hand-forging pitons and selling them from the trunk of his car in Yosemite Valley. Chouinard's pitons quickly gained a reputation for quality, and Chouinard Equipment Ltd. was born soon after in Ventura, California .
Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite , and amorphous carbon , with minor crystalline precipitates filling pores and occasional reduced metal inclusions. [ 1 ]
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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]
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