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Ablation Resistance and Mechanisms of Non‐Equimolar (HfZrTaTiY)B2 Under Cyclic Oxyacetylene Flame Conditions.

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Title: Ablation Resistance and Mechanisms of Non‐Equimolar (HfZrTaTiY)B2 Under Cyclic Oxyacetylene Flame Conditions.
Authors: Pan, Zhaowei1,2,3 (AUTHOR), Ma, Zhuang1,2,3 (AUTHOR), Liu, Yanbo1,2,3 (AUTHOR) boobbyy@163.com, Liu, Shaopu1,2,3 (AUTHOR), Tian, Xinchun1,2,3 (AUTHOR), Zhu, Shizhen1,2 (AUTHOR), Liu, Ling1,2 (AUTHOR), Wang, Ziyan1,2,3 (AUTHOR), Li, Yinglu1,2,3 (AUTHOR), Xie, Zhuohang1,2,3 (AUTHOR)
Source: Journal of the American Ceramic Society. Jul2026, Vol. 109 Issue 7, p1-13. 13p.
Subjects: Ultra-high-temperature ceramics, Eutectic structure, Flame temperature, Oxide coating, Thermal stability, Sintering
Abstract: To explore ultra‐high temperature ceramics (UHTCs) with improved ablation resistance, a novel non‐equimolar high‐entropy diboride (HfZrTaTiY)B2 and equimolar (HfZrTaTi)B2 ceramic bulks were fabricated by spark plasma sintering (SPS). Their ablation behaviors were evaluated under cyclic oxyacetylene flame conditions at a heat flux of 4.18 MW/m2 (maximum temperature ∼2100°C). By comparison, the non‐equimolar design and the introduction of element Y further enhance the ablation resistance of the bulk material as well as the thermal stability of its surface oxide layer, resulting in a mass ablation rate of −0.039 mg/s and a linear ablation rate of −0.088 µm/s. Notably, a pronounced eutectic‐like structure is observed in the oxide scale during cyclic ablation. The clarification of this eutectic precipitation behavior may aid in interpreting ablation morphologies in other multi‐component UHTCs. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell 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
An: 195594011
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Ablation Resistance and Mechanisms of Non‐Equimolar (HfZrTaTiY)B<subscript>2</subscript> Under Cyclic Oxyacetylene Flame Conditions.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Jul2026, Vol. 109 Issue 7, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Ultra-high-temperature+ceramics%22">Ultra-high-temperature ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Eutectic+structure%22">Eutectic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Flame+temperature%22">Flame temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Oxide+coating%22">Oxide coating</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: To explore ultra‐high temperature ceramics (UHTCs) with improved ablation resistance, a novel non‐equimolar high‐entropy diboride (HfZrTaTiY)B2 and equimolar (HfZrTaTi)B2 ceramic bulks were fabricated by spark plasma sintering (SPS). Their ablation behaviors were evaluated under cyclic oxyacetylene flame conditions at a heat flux of 4.18 MW/m2 (maximum temperature ∼2100°C). By comparison, the non‐equimolar design and the introduction of element Y further enhance the ablation resistance of the bulk material as well as the thermal stability of its surface oxide layer, resulting in a mass ablation rate of −0.039 mg/s and a linear ablation rate of −0.088 µm/s. Notably, a pronounced eutectic‐like structure is observed in the oxide scale during cyclic ablation. The clarification of this eutectic precipitation behavior may aid in interpreting ablation morphologies in other multi‐component UHTCs. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell 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: 10.1111/jace.71029
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 1
    Subjects:
      – SubjectFull: Ultra-high-temperature ceramics
        Type: general
      – SubjectFull: Eutectic structure
        Type: general
      – SubjectFull: Flame temperature
        Type: general
      – SubjectFull: Oxide coating
        Type: general
      – SubjectFull: Thermal stability
        Type: general
      – SubjectFull: Sintering
        Type: general
    Titles:
      – TitleFull: Ablation Resistance and Mechanisms of Non‐Equimolar (HfZrTaTiY)B2 Under Cyclic Oxyacetylene Flame Conditions.
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            NameFull: Pan, Zhaowei
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            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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