Boron suboxide materials with Co sintering additives
Source abstract
Abstract
Abstract Difficulties in the densification as well as the low fracture toughness of the resulting polycrystalline materials have delayed the application of boron suboxide as a superhard material in industry. In this work, efforts have been made to improve the fracture toughness and densification of these materials by incorporating suitable secondary phases. Possible candidates are transition metals, which form under sintering conditions a liquid phase. Therefore different Co containing additives (metal, oxide and boride) were used to densify boron suboxide powder by hot pressing. The resulting materials have a significantly improved fracture toughness (3.9 MPa m 1/2 ) and still high hardness (H V5 = 28.6 GPa.).
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Boron and Carbon Nanomaterials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (27)
Show source-provided references
1. A. Zerr, R. Riedel, Introduction: novel ultra hard materials, in Handbook of Ceramic Hard Materials, vol. 1, Wiley-VCH, Weinheim, New York, 2000.10.1002/9783527618217 ↗
2. In situ pressure Raman spectroscopy and mechanical stability of superhard boron suboxide
3. High pressure sintering of B6O powder and properties of the sintered compact10.2472/jsms.47.1000 ↗
4. Boron suboxide: as hard as cubic boron nitride10.1063/1.1494860 ↗
5. Mechanical properties of cubic boron nitride—a perspective
6. High-pressure, Weinheim high-temperature synthesis and characterization of boron suboxide (B6O)10.1021/cm970433+ ↗
7. Microstructure and mechanical properties of B6O–B4C sintered composites prepared under high pressure10.1023/A:1004753116816 ↗
8. B6O–cBN composites prepared by high pressure sintering10.1111/j.1151-2916.2000.tb01224.x ↗
9. High pressure consolidation of B6O–diamond mixtures10.1023/A:1012499214307 ↗
10. Hard and tough boron suboxide based composite10.1016/j.ceramint.2007.05.010 ↗
11. C. Ellison-Hayashi, Z. Morteza, Murray, J.S. Frank, K. Shih-Yee, Boron suboxide material and method for its preparation, United States Patent-US 5,135,892 (1992).
12. An investigation of the physicomechanical properties of B6O and SiB410.1016/0022-5088(79)90028-6 ↗
13. Hot pressing of various boron phases10.1016/0022-5088(86)90003-2 ↗
14. Mechanical properties of hot-pressed boron suboxide and boron
15. B. F. Goosey, Method of fabricating boron suboxide articles, United States Patent-US 3,816,586 (1974).
16. Liquid phase assisted hot pressing of boron suboxide materials10.1016/j.jeurceramsoc.2007.10.011 ↗
17. B6O: a correlation between mechanical properties and microstructure evolution upon Al2O3 addition during hot-pressing10.1111/j.1551-2916.2007.02167.x ↗
18. A. Andrews, Development of boron suboxide composites with improved toughness, PhD thesis, University of the Witwatersrand, 2008.
19. Binary alloy phase diagrams
20. O.T. Johnson, Improvement on the mechanical properties of boron suboxide (B6O) based composites using other compounds as second phase, MSc dissertation, University of the Witwatersrand, 2008.
21. A critical evaluation indentation techniques for measuring fracture toughness. I. Direct Crack Measurements10.1111/j.1151-2916.1981.tb10320.x ↗
22. T.C. Shabalala, The preparation and characterization of boron suboxide (B6O) based composites, PhD thesis, University of the Witwaterstand, 2007.
23. Liquid phase assisted densification of superhard B6O materials10.1016/j.jeurceramsoc.2009.03.002 ↗
24. C.E. Holcombe, J.H. Ottis, Method for preparing boron suboxide, United States Patent-US 3,660,031 (1972).
25. Kosolapova · 1986
26. Field-assisted densification of superhard B6O materials with Y2O3/Al2O3 addition10.1111/j.1551-2916.2009.03197.x ↗
27. A. Andrews, D. McLachlan, I. Sigalas, M. Herrmann, WO 2008132676 (2008-11-06).