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Ablation behavior of ZrB2-SiC-LaB6 ultra-high temperature ceramics prepared by ultrafine multiphase powders combined with spark plasma sintering.

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Title: Ablation behavior of ZrB2-SiC-LaB6 ultra-high temperature ceramics prepared by ultrafine multiphase powders combined with spark plasma sintering.
Authors: Zhou, Zhe1 (AUTHOR) zhouzhe0810@csust.edu.cn, Xia, Dawang1,2 (AUTHOR), Wang, Jie1 (AUTHOR), Guo, Zheng1 (AUTHOR), Liu, Kuihong1 (AUTHOR), Li, Taiyu1 (AUTHOR), Li, Zhi2 (AUTHOR), Liu, Danxia1 (AUTHOR)
Source: Ceramics International. May2026:Part B, Vol. 52 Issue 12, p19958-19970. 13p.
Subjects: Ultra-high-temperature ceramics, Zirconium boride, Sintering, Oxide coating, Silicon carbide, Mechanical behavior of materials
Abstract: ZrB 2 -SiC-LaB 6 UHTCs were prepared using ultrafine multiphase powders synthesized by sol-gel method and borocarbon thermal reduction, combined with the SPS sintering technique. The mechanism of densification and ablation resistance were studied. The UHTCs consist of a ZrB 2 grain skeleton and a nano-mixed phase of SiC, LaB 6 , La 6 (Si 4 O 13)(SiO 4) 2. As the sintering temperature increases from 1700 °C to 2000 °C, the nano-mixed phase grows and the La 6 (Si 4 O 13)(SiO 4) 2 phase transforms into SiC and LaB 6 phases, leaving a small amount of intracrystalline pores. The hardness of the ceramics prepared by this process increased from 417HV 10 to 1024HV 10 , and the relative density increased from 82.36% to 93.86%. After oxyacetylene ablation at 1900 °C for 120 s, the surface of the ceramic oxide layer was flat without flaking and cracking. Among them, the UHTC sintered at 1800 °C has the best ablation resistance, with a mass ablation rate of 0.57 mg/s and a line ablation rate of 1.25 μm/s. During the ablation process, La 2 O 3 reacted with ZrO 2 and SiO 2 on the oxide surface through liquid-phase mass transfer to generate high-viscosity La 4.67 (SiO 4) 3 O and La 2 Zr 2 O 7 , and formed a four-layer oxide structure to protect the substrate. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics 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.)
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  Data: Ablation behavior of ZrB2-SiC-LaB6 ultra-high temperature ceramics prepared by ultrafine multiphase powders combined with spark plasma sintering.
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  Data: <searchLink fieldCode="AR" term="%22Zhou%2C+Zhe%22">Zhou, Zhe</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhouzhe0810@csust.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Xia%2C+Dawang%22">Xia, Dawang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Jie%22">Wang, Jie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guo%2C+Zheng%22">Guo, Zheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Kuihong%22">Liu, Kuihong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Taiyu%22">Li, Taiyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Zhi%22">Li, Zhi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Danxia%22">Liu, Danxia</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. May2026:Part B, Vol. 52 Issue 12, p19958-19970. 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="%22Zirconium+boride%22">Zirconium boride</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Oxide+coating%22">Oxide coating</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon+carbide%22">Silicon carbide</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: ZrB 2 -SiC-LaB 6 UHTCs were prepared using ultrafine multiphase powders synthesized by sol-gel method and borocarbon thermal reduction, combined with the SPS sintering technique. The mechanism of densification and ablation resistance were studied. The UHTCs consist of a ZrB 2 grain skeleton and a nano-mixed phase of SiC, LaB 6 , La 6 (Si 4 O 13)(SiO 4) 2. As the sintering temperature increases from 1700 °C to 2000 °C, the nano-mixed phase grows and the La 6 (Si 4 O 13)(SiO 4) 2 phase transforms into SiC and LaB 6 phases, leaving a small amount of intracrystalline pores. The hardness of the ceramics prepared by this process increased from 417HV 10 to 1024HV 10 , and the relative density increased from 82.36% to 93.86%. After oxyacetylene ablation at 1900 °C for 120 s, the surface of the ceramic oxide layer was flat without flaking and cracking. Among them, the UHTC sintered at 1800 °C has the best ablation resistance, with a mass ablation rate of 0.57 mg/s and a line ablation rate of 1.25 μm/s. During the ablation process, La 2 O 3 reacted with ZrO 2 and SiO 2 on the oxide surface through liquid-phase mass transfer to generate high-viscosity La 4.67 (SiO 4) 3 O and La 2 Zr 2 O 7 , and formed a four-layer oxide structure to protect the substrate. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ceramics 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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