AFM observation of diamond indenters after oxidation at elevated temperatures

作者：Wheeler J M; Oliver R A; Clyne T W^*

来源：Diamond and Related Materials, 2010, 19(11): 1348-1353.

DOI：10.1016/j.diamond.2010.07.004

• Indentation
• Oxidation
• Diamond
• Berkovich and AFM

Use of diamond indenter tips at elevated temperatures can cause oxidation and thermomechanical damage, leading to changes in their topography. A Berkovich diamond indenter has been exposed to 450 degrees C in air, followed by 750 degrees C and 900 degrees C in 1 bar of static, commercial purity argon (30-45 ppm O-2). The effects of oxidation on the geometry of the indenter were investigated using atomic force microscopy. A Berkovich and a 10 mu m tip radius conospheroidal indenter were also examined, after being subjected to 5 years of intermittent use at elevated temperatures (<= 400 degrees C). Significant changes in tip topography were observed, suggesting that commercial purity argon may be an unsuitable atmosphere for high temperature indentation testing. Finally, a mechanism of oxidative etching, which may have potential as a method of sharpening indenters, is also reported.

• 出版日期2010-11