DOI: 10.1557/jmr.2007.0295. Hardness and deformation microstructures of nano-polycrystalline diamonds synthesized from various carbons under high pressure and high temperature

Hardness and deformation microstructures of nano-polycrystalline diamonds synthesized from various carbons under high pressure and high temperature

10.1557/jmr.2007.0295

Crossref journal-article

Springer Science and Business Media LLC

Journal of Materials Research (297)

Abstract

Mechanical properties of high-purity nano-polycrystalline diamonds synthesized by direct conversion from graphite and various non-graphitic carbons under static high pressures and high temperatures were investigated by microindentation testing with a Knoop indenter and observation of microstructures around the indentations. Results of indentation hardness tests using a superhard synthetic diamond Knoop indenter showed that the polycrystalline diamond synthesized from graphite at ⩾15 GPa and 2300–2500 °C (consisting of fine grains 10–30 nm in size and layered crystals) has very high Knoop hardness (Hk ⩾ 110 GPa), whereas the hardness of polycrystalline diamonds synthesized from non-graphitic carbons at ⩾15 GPa and below 2000 °C (consisting only of single-nano grains 5–10 nm in size) are significantly lower (Hk = 70 to 90 GPa). Microstructure observations beneath the indentations of these nano-polycrystalline diamonds suggest that the existence of a lamellar structure and the bonding strength of the grain boundary play important roles in controlling the hardness of the polycrystalline diamond.

Bibliography

Sumiya, H., & Irifune, T. (2007). Hardness and deformation microstructures of nano-polycrystalline diamonds synthesized from various carbons under high pressure and high temperature. Journal of Materials Research, 22(8), 2345â2351.

Authors 2

H. Sumiya (first)
T. Irifune (additional)

References 18 Referenced 183

10.1002/9783527618217.ch4
10.1021/nl0602084
10.1063/1.2196478
10.1016/S0925-9635(97)00149-0
10.1063/1.1850654
{'key': 'S0884291400036384_B11', 'first-page': '313', 'article-title': 'Nature of polycrystalline diamond synthesized by direct conversion of graphite using Kawai-type multianvil apparatus.', 'volume': '14', 'author': 'Irifune', 'year': '2004', 'journal-title': 'New Diamond Frontier Carbon Technol.'} / New Diamond Frontier Carbon Technol. / Nature of polycrystalline diamond synthesized by direct conversion of graphite using Kawai-type multianvil apparatus. by Irifune (2004)
10.1063/1.1684753
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10.1016/j.diamond.2004.06.017
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Dates

Type	When
Created	18 years, 1 month ago (Aug. 2, 2007, 2:34 p.m.)
Deposited	4 years, 6 months ago (Feb. 24, 2021, 3:25 p.m.)
Indexed	1 month, 2 weeks ago (July 20, 2025, 12:03 a.m.)
Issued	18 years, 1 month ago (Aug. 1, 2007)
Published	18 years, 1 month ago (Aug. 1, 2007)
Published Online	14 years, 7 months ago (Jan. 31, 2011)
Published Print	18 years, 1 month ago (Aug. 1, 2007)

Funders 0

None

BibTeX

@article{Sumiya_2007, title={Hardness and deformation microstructures of nano-polycrystalline diamonds synthesized from various carbons under high pressure and high temperature}, volume={22}, ISSN={2044-5326}, url={http://dx.doi.org/10.1557/jmr.2007.0295}, DOI={10.1557/jmr.2007.0295}, number={8}, journal={Journal of Materials Research}, publisher={Springer Science and Business Media LLC}, author={Sumiya, H. and Irifune, T.}, year={2007}, month=aug, pages={2345–2351} }

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