Ceramic Hardness Hv

Often hardness of ceramic material as with other materials is directly equated to wear resistance.

Ceramic hardness hv. 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. Where f applied load kg. 20 indicates the loading time if it differs from 10 s to 15 s.

Hardness of ceramic materials is usually tested by vickers or knoop methods using diamond indenters. Vickers hardness numbers are reported as xxxhvyy e g. Hv 1 854 f d. 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.

Hardness is an important parameter correlating with wear resistance of the mate. The hardness of ceramic materials is a property which is of high significance as it relates to the ability of the material to withstand penetration of the surface through a combination of brittle fracture and plastic flow. Metals ceramics are harder than others e g. The method for measuring the hardness of fine ceramics is defined in jis r 1610 iso 14705.

440hv30 or xxxhvyy zz if duration of force differs from 10 s to 15 s e g. 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. In fact many ceramic specifications list minimum hardness requirements.