Scratch hardness tests are usually performed on brittle materials, such as ceramics and minerals because they do not undergo plastic deformation. This type of hardness is quantified on a scale known as the Mohs Scale, which is based on the relative scratch hardness of various materials.
On this scale, talc is assigned a value of 1, while diamond is assigned a value of Figure 2. Mohs hardness scale. During rebound hardness tests, the material absorbs the impact energy from a diamond-tipped hammer and returns it, causing the hammer to bounce after it strikes the surface. The Leeb rebound hardness test LRHT is one of the most popular methods used for measuring the rebound hardness of metals.
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What are the advantages and disadvantages of the 'simple' hardness scale as compared to the Mohs hardness scale? My answer:. Many minerals have a range of hardness! Also, many minerals are harder if you scratch them in one direction than if you scratch them in another direction.
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