Automatic Micro Hardness Tester

B. Description :

Hardness of a material is generally defined as Resistance to the permanent indentation under static and dynamic load. Hardness is the property of the material by which it offers resistance to scratch or indentation. It is the most important property, as the material is subjected to friction and scratch. When a material is required to use under direct static or dynamic loads, only indentation hardness test will be useful to find out resistance to indentation. This test is an indentation test used for smaller specimens and

harder materials. In this test indentor is forced into the surface of a test piece in two operations, measuring the permanent increase in depth of an indentation from the depth increased  from  the  depth  reached  under  a  datum  load  due  to  an  additional  load.

Measurement of indentation is made after removing the additional load. Indentor used is the cone  having an angle  of 120 degrees  made of diamond. The  principle of hardness testing has to do with the application of a standard load (Based on the type  of material)  through  a standard  indentor (cone  or ball indentor)  for a  standard duration of time. The hardness number directly obtained.