The Influence of the Rockwell Indenter Tip Geometry on the Progressive Load Scratch Test

Many companies are now using the scratch test for quality control of their coated samples and therefore require suitable ASTM and ISO standards which are robust and assure reproducibility. In order to conform to these standards, Anton Paar has developed a new procedure to verify the geometry of Rockwell indenters with much tighter tolerance than that specified in the current standards. The results in this applications report were a part of an effort to improve the quality of commercially available Rockwell indenters. It was found that the ISO 6508-2 standard is too broad and inaccurate when applied to indenters used for scratch testing. This suggests that a dedicated Rockwell indenter standard for scratch testing would be more appropriate.

Introduction

Over the last 30 years, Anton Paar (previously CSM Instruments) has established itself as the world leader in scratch testing. In the continuing effort to improve the accuracy and reproducibility of the method, Anton Paar remains actively involved in several standardization committees.

Many companies are now using the scratch test as a dedicated instrument for quality control and therefore require suitable ASTM and ISO standards which are robust and assure reproducibility. In order to conform to these new standards, Anton Paar has developed a new procedure to verify the geometry of Rockwell indenters with much tighter tolerance than that specified in the current standards. This applications report summarizes some recent work which has been carried out to characterize the tip geometries of four different batches of Rockwell diamond indenters manufactured by four different suppliers. The results presented will confirm that the tolerances specified by current standards are insufficient for obtaining sufficient reproducibility in the scratch test method.

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