Peculiarities of Surface Fracture of B₄C Ceramics under Loads

Abstract:

The paper presents experimental results showing the nature of the destruction in the surface layer of В₄С ceramics during hardness and fracture toughness tests performed by Vickers diamond pyramid indentation with different applied loads (4.91 - 294.3 N). Ceramics made from boron carbide powder with 10 wt.% additive of submicron fraction of the same powder sintered in spark discharge plasma by Spark Plasma Sintering (SPS-method) under different sintering conditions was studied. Changes of micro hardness and hardness of the samples were measured by micro hardness tester PМТ-3М with the loads Р up to 4.9 N; by micro hardness tester Micromet with P= 9.811.77 N; and by hardness tester ТP-7R-1 with the loads of 49 - 294.3 N. Indentation, exposure, and unloading were carried out according to standard method during 30-40 seconds. The microstructure and topography of the surface of ceramic samples splits after indentation were studied by scanning electron microscopy (SEM, microscope JEOL SEM-7500FA). The profiles of the split surface depth were determined by Linnik interferometer МII-4.

• Periodical: Advanced Materials Research (Volume 872)
• Pages: 65-69
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.872.65
• Online since: December 2013
• Authors: Vasiliy K. Struts, Oleg L. Khasanov, Zulfa G. Bikbaeva, Valentina V. Polisadova, Edgar S. Dvilis
• Keywords: Boron Carbide Ceramics, Electron Microscopy, Microhardness, Microstructure, SPS-Method, Surface Topography

References

[1] Аndrievskiy R.А., Spivak I.I. Strength refractory compounds and materials on theer basic. – М.: Мetallurgy, (1989).

[2] Marshall D.B., Lawn B.R., Ewans A.G. Elastic/Plastic Indentation Damage in Ceramics: The Lateral Crack System, J. American Ceramic Society № 11 vol. 65 (1982) 561-566.

DOI: 10.1111/j.1151-2916.1982.tb10782.x

[3] Goffredo de Portu. Introduction to mechanical behavior of ceramics. Faenza, (1992).

[4] Nosov Yu. G., Derkachenko L. I., Zhurnal tekhnicheskoi fiziki (Journal of technical physics) 10, vol. 73 (2003) 139.

[5] Akio Yonezu, Baox Ing Xu, Xi Chen., Materials Science and Engineering A. 507 (2009) 226.

[6] Lyakishev N. P., Kalin B. A., Solonin M. I., Perspektivnoe napravlenie poluchenia i obrabotki materialov. Byulleten' MOM (Perspective direction of materials production and processing. The Bulletin of Inter-Regional Scientific and Technical Society of Material Engineers) 1 (2000).

[7] Belov N. N., Biryukov Yu. A., Roslyak A. T., et al., Doklady Akademii Nauk (Reports of the Academy of Sciences) 397 (2004) 337.

[8] Lawn B.R., Hockey B. J., Richter H., Indentation analysis: application in the strength and wear of brittle materials, J. of Microscopy. 130, pt. 3 (1983) 295-308.

DOI: 10.1111/j.1365-2818.1983.tb04550.x