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Technical Briefs

Modification of Surface Properties on Cemented Carbide Alloys Through Mirror-Quality Finish Grinding

[+] Author and Article Information
Kazutoshi Katahira

Materials Fabrication Laboratory,
RIKEN, 2-1 Hirosawa Wako-shi,
Saitama 351-0198, Japan
e-mail: kazukata@riken.jp

Jun Komotori

Department of Mechanical Engineering,
Keio University,
3-14-1 Hiyosh, Kohoku-ku Yokohama,
Kanagawa 223-8522, Japan

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF Micro- AND Nano-Manufacturing. Manuscript received May 20, 2013; final manuscript received September 10, 2013; published online October 3, 2013. Assoc. Editor: Bin Wei.

J. Micro Nano-Manuf 1(4), 044501 (Oct 03, 2013) (5 pages) Paper No: JMNM-13-1029; doi: 10.1115/1.4025462 History: Received May 20, 2013; Revised September 10, 2013

In this study, efficient, high-precision grinding of cemented carbide alloys using a specific grinding wheel was performed, and the ground surface characteristics were investigated in detail. The results showed that final finishing using a chromium-bonded wheel produced an extremely smooth surface with an average roughness Ra of 4 nm. The grinding process produced a chromium- and copper-rich surface layer, as well as a large amount of diffusion of oxygen. Adhesive strength tests using a microscratching method were also carried out on ground substrates coated with diamond-like carbon (DLC) films. The surface ground by the chromium-bonded wheel exhibited superior adhesive strength due to its strong chemical affinity with the DLC film.

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References

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Figures

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Fig. 1

Schematic illustration of ELID grinding system

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Fig. 2

Comparison of the surface roughness Ra and Rz

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Fig. 3

Finished workpieces

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Fig. 4

Surface morphology of the Cr-series

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Fig. 5

SEM observation and EDX analysis of Cr-bond grinding wheel surface

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Fig. 6

Behavior of the initial electrolytic current

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Fig. 7

SEM observation results for the surface of the grinding wheels after the initial electrolytic dressing

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Fig. 8

Results of EDX analysis for the grinding wheel surfaces before and after electrolytic dressing

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Fig. 9

Results of XPS analysis in the depth direction

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Fig. 10

Detected elements profile in depth direction analyzed by using GD-OES

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Fig. 11

Overview of the scratch tests

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Fig. 12

Scratch load of the buckling crack

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