Wedge with tapered corners. Edge length from 0.5µm to 2mm. Angles: 30° < i < 90° 15°< s < 45° The above shows wedge indenter configurations.
MST manufactures diamond and sapphire cone nano indenters with rounded tips at micrometer and nanometer dimensions. A TEM calibrated with a traceable standard is used to image and measure most of its nano indenters. The graphic and calculated analysis of rounded conical indenters described here is available on request for purchased indenters. When ordering rounded cone indenters please supply the expected depth of indentation, in addition to the desired tip radius and cone angle. In the present field of nano indentation, spherical tipped indenters made of diamond or sapphire are desirable in numerous applications. A truly spherical tipped cone, as in Fig. 1, is difficult to fabricate at nanometer scale. In practice, a rounded cone may have a geometry similar to Fig. 2. The tip is spherical at the apex but has a transition section which is neither part of the sphere nor the cone. If only a minimal indentation depth is sufficient, such a rounded cone provides acceptable spherical indentations. When deeper indentations are needed, a more precise definition of the area function is required.
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Custom 3-Sided Indenters: 20° < a < 80° Micro Star 3-sided sharp indenters tip radius < 50nm. The above shows sharp point 3-sided pyramidal geometry. The defining angle a is the angle between the axis and any of the faces. The 3 faces are symmetrically placed around the axis 120° apart. The Berkovich indenter is designed to have the same area as the Vickers indenter at any given indentation depth. The modified Berkovich indenter is designed to have the same projected area as the Vickers indenter at any given indentation depth. Micro Star makes a wide range of 3-sided indenters with custom angles and flat or round ends of any compatible size.
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Included conical angle: 20° c 140° Micro Star sharp cone radius less than 300nm. The above shows the general cone geometry with sharp, flat or spherical end. There are no recognized standard angles or sizes for conical indenters.
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