Fractal dimension of decobalt surface on PDC with different acid corrosion reagents at room temperature

The presence of cobalt in polycrystalline diamond compact (PDC) affects the wear resistance and thermal stability of the material. Therefore, the removal of Co is often required, and the holes that left after the removing of Co will have great impacts on morphology and mechanical properties of PDC....

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Bibliographic Details
Published in:Diamond and related materials 2020-05, Vol.105, p.107699, Article 107699
Main Authors: Cen, Hao, Fu-ming, Deng, Zheng-hai, Guo, Xiang, Bo, Shuang, Wang, Xin, Zhao
Format: Article
Language:English
Subjects:
Bend strength
Bending strength
Depletion
Ferric chloride
Fractal dimension
Fractal geometry
Fractals
Iron chlorides
Lewis acid
Mechanical properties
Morphology
PDC
Phosphoric acid
Polycrystalline diamond
Reagents
Removal of Co
Room temperature
Sulfuric acid
Thermal resistance
Thermal stability
Wear resistance
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Summary:The presence of cobalt in polycrystalline diamond compact (PDC) affects the wear resistance and thermal stability of the material. Therefore, the removal of Co is often required, and the holes that left after the removing of Co will have great impacts on morphology and mechanical properties of PDC. However, the fractal dimension based on fractal theory could quantitatively describe the specific information such as the number and size of holes. In this paper, we used four different acid reagents, sulfuric acid, compound acid, phosphoric acid and Lewis acid-FeCl3 characterized the holes and their distribution on the surface of PDC after soaking in different acid reagent at room temperature. We studied the relationship between the depth of Co depletion layer, thermal stability, bending strength and the fractal dimension. Therefore we established the relationship between fractal dimension and structure and properties of the holes. The results show that the morphology of surface and properties of samples could be characterized by fractal dimension of holes on the surface. The larger the fractal dimension, the better the acid-etching effect, the larger the radius distribution of the surface holes, the more complicated the hole structure of the PDC surface, the deeper the holes, the better the thermal stability, but the lower the bending strength. [Display omitted] •Using fractal dimension of fractal theory to quantitatively describe the specific information such as the number and size of holes on the surface of PDC after removing Co from PDC.•Studied the relationship between fractal dimension and the depth of Co depletion layer, thermal stability and bending strength after removing Co from PDC.•Compared the acid-etching effect of four different acid corrosion reagents (sulfuric acid, complex acid, phosphoric acid and Lewis acid-FeCl3) at room temperature.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2020.107699