Oxidation behaviors of ZrB 2 –SiC binary composites above 2000 °C

Inoue, Ryo; Arai, Yutaro; Kubota, Yuki

doi:10.1016/j.ceramint.2017.03.129

Cited by 46 publications

(8 citation statements)

References 36 publications

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“…4,[14][15][16][17][18][19][20][21][22] However, SiC reacts with oxygen to form gaseous SiO, and SiO 2 begins to decompose at temperatures above 1800 • C, accelerating the recession through the oxidation of Si-containing materials. 17,19,23 To develop advanced aerospace heat-resistant materials for use above 1800 • C, a novel design concept for Si-free materials to prevent recession caused by oxidation is required.…”

Section: Introductionmentioning

confidence: 99%

Material design using calculation phase diagram for refractory high‐entropy ceramic matrix composites

Arai,

Saito,

Samizo

et al. 2024

Int J Applied Ceramic Tech

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To achieve Si‐free refractory ceramic matrix composites exposed to an oxidizing atmosphere at approximately 2000°C, a Ti–Zr–Mo ternary alloy melt‐infiltration (MI) method was developed for the production of carbon fiber‐reinforced refractory high‐entropy ceramic matrix composites (C/RHECs), with high‐entropy carbides serving as the matrix. This approach was designed using calculation phase diagrams (CALPHADs) and the calculation of thermodynamic parameters. The combination of CALPHAD and the calculation of alloy and carbon reactivity enabled the prediction of reaction and infiltration behavior into a preform comprising carbon fiber, carbon black, and transition metal carbide powders. Furthermore, C/RHECs featuring a (Ti, Zr, Hf, Nb, Ta, Nb, Mo)C matrix were experimentally fabricated through the Ti–Zr–Mo alloy MI method in accordance with the design. The arc‐wind tunnel tests on the C/RHECs conducted at approximately 2000°C revealed surfaces covered with complex oxides. The apparent oxidation rate of the C/RHECs was similar to that of Si‐containing ceramics and composites. These results indicate that complex oxides act as a barrier to oxygen diffusion toward unoxidized regions, making Si no longer essential for protecting materials from oxidation above 2000°C.

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Section: Introductionmentioning

confidence: 99%

Material design using calculation phase diagram for refractory high‐entropy ceramic matrix composites

Arai,

Saito,

Samizo

et al. 2024

Int J Applied Ceramic Tech

Self Cite

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“…The authors fabricated C/ZrB 2 -SiC-ZrC composites by Si and Si-ZrSi 2 eutectic with a melting temperature of~1380 • C. However, severe degradation occurs during heat exposure at 1700 • C in air since the eutectic mixture melts and flows toward the outside of the composites under dynamic pressure [11,25]. Moreover, SiO(g) is formed by the oxidation of Si and/or SiC, which is not desirable for UHTC matrix composites exposed to temperatures above 2000 • C, since a SiO 2 (l) layer, which is well known as a barrier to oxygen diffusion, is not formed on the surface by the oxidation of Si and/or SiC [26,27]. Since SiO(g) is a gaseous species, the oxidation of Si and/or SiC causes the formation of a porous layer and the oxidized region is delaminated from the porous region [3,4,28,29].…”

Section: Introductionmentioning

confidence: 99%

Use of Zr–Ti Alloy Melt Infiltration for Fabricating Carbon-Fiber-Reinforced Ultrahigh-Temperature Ceramic Matrix Composites

2021

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Carbon-fiber-reinforced ultrahigh-temperature ceramic (C/UHTC) matrix composites are an attractive candidate for fabricating various hot structures. The present study aimed to establish a Si-free Zr–Ti melt-infiltration method for fabricating C/UHTC matrix composites. To achieve this, the wettability of Zr–Ti alloys on carbon and their reactivity to carbon were examined. The alloys were melted on graphite plates and infiltrated into model preforms, which were made of porous carbon and had median pore diameters of 3 μm. The results showed that the apparent contact angle between Zr–Ti and C measured from melted alloys on carbon in room temperature was ~20–42° and that the alloys infiltrated into the preforms regardless of the Zr or Ti content. However, with an increase in the Zr content in the alloys, carbon disappeared and was absorbed into the alloys since the reactivity of Zr was higher than that of Ti and the specific surface area of the porous preform was higher than that of carbon-fiber-reinforced carbon composites, which are a typical preform of C/UHTC matrix composites. These results clearly indicate that not only the capillary flow during infiltration but also the reactivity of alloys to preforms should be considered in the process design for fabricating high-density composites via Zr–Ti infiltration.

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“…However, pure ZrB 2 ceramic will be oxidized rapidly above 1200 °C due to the generated B 2 O 3 evaporating rapidly, which makes substrate exposes to the environment. [7,8] With the addition of SiC, ZrB 2 -SiC ceramics show better oxidation resistance due to the formation of stable glassy SiO 2 oxide layer which can flow and prevent the entry of oxygen. [9] In addition, the mechanical properties of ZrB 2 -based ceramics such as bending strength and fracture toughness can be improved by adding SiC.…”

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Oxidation Behaviors of ZrB₂–SiC Ceramics with Different Porosity

et al. 2023

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ZrB2–SiC ceramics have great application potential in thermal protection system of hypersonic aircraft, due to their excellent oxidation resistance and mechanical properties. Porosity is one of the main factors which will obviously affect the oxidation behaviors of ZrB2–SiC ceramics. Herein, ZrB2–SiC ceramics with three different porosity are sintered by spark plasma sintering at different temperatures. Then, a series of oxidation tests of the ceramics with different porosity are carried out at different temperatures and with different time. Morphologies and microstructures of the oxidation surface and cross section, as well as the oxide layer thickness and weight change are discussed in detail. Results show that the porosity of ZrB2–SiC ceramics has great influence on the oxidation behaviors of ceramics. The oxide layer thickness and weight change gradually increase with the increase of oxidation temperature and oxidation time for ZrB2–SiC ceramics with different porosity. As the porosity of ZrB2–SiC ceramics decreases, the oxide layer thickness and weight change generally decrease, which shows that the ceramics with lower porosity have stronger oxidation resistance. This work provides a relative systematic analysis of the effects of porosity on the oxidation behaviors of ZrB2–SiC ceramics.

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Oxidation behaviors of ZrB 2 –SiC binary composites above 2000 °C

Cited by 46 publications

References 36 publications

Material design using calculation phase diagram for refractory high‐entropy ceramic matrix composites

Material design using calculation phase diagram for refractory high‐entropy ceramic matrix composites

Use of Zr–Ti Alloy Melt Infiltration for Fabricating Carbon-Fiber-Reinforced Ultrahigh-Temperature Ceramic Matrix Composites

Oxidation Behaviors of ZrB₂–SiC Ceramics with Different Porosity

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Oxidation behaviors of ZrB 2 –SiC binary composites above 2000 °C

Cited by 46 publications

References 36 publications

Material design using calculation phase diagram for refractory high‐entropy ceramic matrix composites

Material design using calculation phase diagram for refractory high‐entropy ceramic matrix composites

Use of Zr–Ti Alloy Melt Infiltration for Fabricating Carbon-Fiber-Reinforced Ultrahigh-Temperature Ceramic Matrix Composites

Oxidation Behaviors of ZrB2–SiC Ceramics with Different Porosity

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Oxidation Behaviors of ZrB₂–SiC Ceramics with Different Porosity