bly what made carbides especially appealing to me On behalf of those of our readers who don t work with carbides every day we would like to ask your expert opinion on a small materials technology matter What does carbide really mean and how exactly do we make metals that are already hard even harder Gerhard Melcher A carbide is a compound made from hard mate rials the carbide particles of which are bonded by a binding agent The basic structure of a carbide is shown by tungsten carbide and cobalt The fine carbide particles are generally directly compressed to shape them and then sintered 1350 1500 C to make them hard Hard material coatings like CVD and PVD can make carbides even harder Which properties better more practical or worse are exhibited by carbides in comparison to other very hard materials Gerhard Melcher One of the most outstanding properties of car bides is their wear resistance and their ability to withstand massive physical stresses such as shocks deformation high temperatures cor rosion and high pressure No other material can beat carbides in that re spect PCD may be harder and more hard wearing but it is also substan tially more brittle High speed steel HSS is tougher and more resistant to fractures but its wear resistance is significantly lower 15

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