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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]
Copyright of Tribology International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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  Data: Effect of the degree of densification on the unlubricated sliding-wear behaviour of monolithic B4C ceramics.
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  Data: <searchLink fieldCode="AR" term="%22Rodríguez-Rojas%2C+Fernando%22">Rodríguez-Rojas, Fernando</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zamora%2C+Victor%22">Zamora, Victor</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guiberteau%2C+Fernando%22">Guiberteau, Fernando</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ortiz%2C+Angel+L%2E%22">Ortiz, Angel L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> alortiz@unex.es</i>
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  Data: <searchLink fieldCode="JN" term="%22Tribology+International%22">Tribology International</searchLink>. Aug2023, Vol. 186, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Ceramics%22">Ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+wear%22">Mechanical wear</searchLink><br /><searchLink fieldCode="DE" term="%22Sliding+wear%22">Sliding wear</searchLink><br /><searchLink fieldCode="DE" term="%22Hardness%22">Hardness</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: 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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  Data: <i>Copyright of Tribology International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.triboint.2023.108656
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      – Code: eng
        Text: English
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      – SubjectFull: Ceramics
        Type: general
      – SubjectFull: Mechanical wear
        Type: general
      – SubjectFull: Sliding wear
        Type: general
      – SubjectFull: Hardness
        Type: general
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      – TitleFull: Effect of the degree of densification on the unlubricated sliding-wear behaviour of monolithic B4C ceramics.
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            NameFull: Zamora, Victor
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            NameFull: Guiberteau, Fernando
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              M: 08
              Text: Aug2023
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              Y: 2023
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