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Hard and brittle materials such as sintered tungsten carbide wc, tungsten alloy, optical. Gemstonea gemstone or gem also called a precious or semiprecious stone, a fine gem, or jewel is a piece ofmineral, which, in cut and polished form, is used tomake jewellery or other adornments. For some time now, researchers at tu wien have been studying the quantum properties of such diamonds, but. Now most diamonds come to a sharp point at the culet, and thus all culets with points are vulnerable figure 14. Pdf contact damage of hard and brittle thin films on ductile. Figure1 using two diamonds, scientists squeezed hydrogen to pressures above those in earths core.
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