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scratch hardness
Scratch hardness tests are used to determine the hardness of a material to scratches and abrasion. The earliest test was developed by mineralogist Friedrich Mohs in 1820 (see Mohs scale). It is based on relative scratch hardness, with talc assigned a value of 1 and diamond assigned a value of 10. Mohs' scale had two limitations; it was not linear, and most modern abrasives fall between 9 and 10.
Ridgeway modified the Mohs scale by giving garnet a hardness of 10 and diamond a hardness of 15. Wooddell extended the scale further by using resistance to abrasion, where diamond equals 42.5. Resistance to abrasion is less affected by surface variations than other methods of indentations.
There is a linear relationship between cohesive energy density (lattice energy per volume) and Wooddell wear resistance, occurring between corundum (H=9) and diamond (H=42.5).
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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