Ceramic Hardness Hv

440hv30 or xxxhvyy zz if duration of force differs from 10 s to 15 s e g.

Ceramic hardness hv.

The method for measuring the hardness of fine ceramics is defined in jis r 1610 iso 14705. In fact many ceramic specifications list minimum hardness requirements. Vickers hardness is a resistance value obtained by pressing a diamond indenter onto a test specimen. This has led to the use of fine ceramics in.

440 is the hardness number hv gives the hardness scale vickers 30 indicates the load used in kgf. 20 indicates the loading time if it differs from 10 s to 15 s. For example a new astm zirconia specification for surgical implants f 1873 98 stipulates that vickers hardness hv shall be no less than 11 8 gpa 1200 kgf mm 2 at a load of 9 8 n 1 kgf. Vickers hardness numbers are reported as xxxhvyy e g.

Where f applied load kg. Hardness is an important parameter correlating with wear resistance of the mate. Metals ceramics are harder than others e g. In this test a hardened steel or tungsten carbide for extremely hard materials ball of 2 5 5 or 10 mm in diameter is used as indenter.

Often hardness of ceramic material as with other materials is directly equated to wear resistance. Vickers hardness calculator hardness is a measure of the resistance of a material to plastic deformation induced by applied forces. Hardness of ceramic materials is usually tested by vickers or knoop methods using diamond indenters.