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Effect of the degree of densification on the unlubricated sliding-wear behaviour of monolithic B4C ceramics.

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Title: Effect of the degree of densification on the unlubricated sliding-wear behaviour of monolithic B4C ceramics.
Authors: Rodríguez-Rojas, Fernando1 (AUTHOR), Zamora, Victor1 (AUTHOR), Guiberteau, Fernando1 (AUTHOR), Ortiz, Angel L.1 (AUTHOR) alortiz@unex.es
Source: Tribology International. Aug2023, Vol. 186, pN.PAG-N.PAG. 1p.
Subjects: Ceramics, Mechanical wear, Sliding wear, Hardness
Abstract: The unlubricated sliding-wear behaviour of monolithic B 4 C ceramics with densification degree from ∼62 % up to ∼99.1 %, and therefore hardness from ∼7.9 GPa up to ∼35.3 GPa, was investigated. It was found that the specific wear rate decreases somewhat asymptotically by one order of magnitude (from 10–7 down to 10–8 mm3/(N m)) with the increase of densification degree/hardness. This is because, while wear always occurred by abrasion, below a certain threshold of densification/hardness it took place predominantly in brittle mode by fracture-dominated three-body abrasion and above that threshold predominantly in ductile mode by plasticity-dominated two-body abrasion. Finally, it was found that over-sintering of monolithic B 4 C ceramics above their near-full densification condition is impractical and could even be detrimental for tribological applications. • The effect of the densification degree on the sliding wear of monolithic B 4 C ceramics is investigated. • The specific wear rate decreases by one order of magnitude with increasing densification degree. • Sliding wear of monolithic B 4 C ceramics occurs, regardless of the densification degree, by abrasion. • Below a certain threshold of densification abrasion is dominated by fracture, and above that threshold by plasticity. • Over-sintering above ∼1900 °C is impractical in terms of wear performance, and even likely detrimental. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The unlubricated sliding-wear behaviour of monolithic B 4 C ceramics with densification degree from ∼62 % up to ∼99.1 %, and therefore hardness from ∼7.9 GPa up to ∼35.3 GPa, was investigated. It was found that the specific wear rate decreases somewhat asymptotically by one order of magnitude (from 10–7 down to 10–8 mm3/(N m)) with the increase of densification degree/hardness. This is because, while wear always occurred by abrasion, below a certain threshold of densification/hardness it took place predominantly in brittle mode by fracture-dominated three-body abrasion and above that threshold predominantly in ductile mode by plasticity-dominated two-body abrasion. Finally, it was found that over-sintering of monolithic B 4 C ceramics above their near-full densification condition is impractical and could even be detrimental for tribological applications. • The effect of the densification degree on the sliding wear of monolithic B 4 C ceramics is investigated. • The specific wear rate decreases by one order of magnitude with increasing densification degree. • Sliding wear of monolithic B 4 C ceramics occurs, regardless of the densification degree, by abrasion. • Below a certain threshold of densification abrasion is dominated by fracture, and above that threshold by plasticity. • Over-sintering above ∼1900 °C is impractical in terms of wear performance, and even likely detrimental. [ABSTRACT FROM AUTHOR]
ISSN:0301679X
DOI:10.1016/j.triboint.2023.108656