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Knoop hardness in each plane/direction of synthetic type IIa, synthetic type Ib and natural type Ia diamond crystals (load; ) (Refs. 4 and 5).
Knoop indenter prepared from synthetic type IIa diamond crystal.
Life durations of natural diamond Knoop indenters (black, No. 1-24) and synthetic type IIa diamond Knoop indenters (hatched, Nos. 25 and 26).
SEM images of synthetic IIa diamond Knoop indenters. (a) Not in use (No. 27), (b) after 158 indentations (No. 25).
SEM images of natural diamond Knoop indenters. (a) After 23 indentations, (b) after 10 indentations.
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