Knoop/Vickers Hardness Testers
Microhardness testing, commonly referred to as Knoop and/or Micro-Vickers testing, is performed by pressing an indentor of a specified geometry into the test surface. Applying only a single test force, the resultant impression or unrecovered area is measured. The Knoop diamond produces an elongated rhombic based diamond shaped indent with a ratio between long and short diagonals of about 7:1. Knoop tests are typically performed at test forces from 10 – 1000g, are best used in small test areas or on brittle materials as minimal material deformation occurs on the short diagonal area.
Macrohardness testing, also commonly referred to as Vickers testing, is also performed by pressing an indenter of specified geometry into the test surface. Again applying only a single test force, the resultant impression or unrecovered area is then measured. The Vickers diamond produces a square based pyramidal shape with a depth of indentation of about 1/7th of the diagonal length. The Vickers test has two distinct force ranges, micro (10 – 1000g) and macro (1 – 100kg), to cover all testing requirements. The indenter is the same for both ranges, therefore Vickers hardness values are continuous over the total range of hardness for metals (typically HV100 – HV1000).
- Ferrous, steel & non ferrous metals
- IC wafers
- Thin plastics
- Metal foils & laminates
- Surface layers
- Heat treatment effects
- Case depth
- Carburized layer depth
- Hardness from welding to deposition