The Ablation and Oxidation Behaviors of SiC Coatings on Graphite Prepared by Slurry Sintering and Pack Cementation

Aliasgarian, Reza; Naderi, M.; Mirsalehi, Seyyed Ehsan; Safi, Saeed

doi:10.1007/s11665-018-3462-z

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…In situ reactions between Si (74 μm) and C (53 μm) produce SiC with larger particle sizes, resulting in many macroholes in the coatings. [ 48 ] According to particle grading rules, ZrB 2 particles with smaller size (44 μm) may fill in the macroholes to improve the density of coatings. The porosities of Z1, Z2, Z3, and Z4 are 12.38%, 8.11%, 6.18%, and 7.31%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of ZrB₂ and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB₂–SiC Coatings Produced by Slurry Brushing Method

Duan

Ren

et al. 2023

Adv Eng Mater

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ZrB2–SiC coatings are prepared on the surface of graphite by slurry brushing method to improve the oxidation resistance. Effects of ZrB2 content and polyvinyl butyral (PVB)–ethanol solution concentration on microstructure and static oxidation behavior of the ZrB2–SiC coatings are investigated at 1200 °C in air. The results indicate that increasing ZrB2 content improves the oxidation resistance of the coatings. When ZrB2 content increases from 30 to 45 wt%, weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from −0.92% to −1.67%. Increasing binder solution concentration raises component content in the coatings. As PVB–ethanol binder concentration increases from 0.025 to 0.075 g mL−1, weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from 0.32% to −0.38%. Excellent oxidation resistance of ZrB2–SiC coating is attributed to self‐sealing ability of B2O3 and borosilicate glass. The composite glass can inhibit oxygen diffusion by filling defects in the coating promptly. The borosilicate glass phase can enhance the fluidity of the composite glass. ZrO2 and ZrSiO4 particles restrict the growth of the microcrack, which improves the oxidation resistance of ZrB2–SiC coating.

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Section: Resultsmentioning

confidence: 99%

Effect of ZrB₂ and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB₂–SiC Coatings Produced by Slurry Brushing Method

Duan

Ren

et al. 2023

Adv Eng Mater

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“…3,16 The SiC secondary phase is also a low-density refractory ceramic with a high melting temperature of ∼2800 • C. This phase is one of the preferred sintering additives for HfC to reduce its sintering temperatures as well as to hinder grain growth. 3,19 SiC is also similar to HfC in that it exhibits good chemical stability and excellent mechanical properties. 3 The addition of SiC to the blend (20-50 vol.%) allows for crack bridging and deflection, resulting in improved fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

“…3 The addition of SiC to the blend (20-50 vol.%) allows for crack bridging and deflection, resulting in improved fracture toughness. 8 A key difference is that SiC oxidizes to form SiO 2 between 1000 • C and 1300 • C, which offers good oxidation resistance (serving as an oxygen diffusion barrier) up to 1600 • C. 17,19,20 In the HfC-SiC composite system, 80 wt.% HfC-20 wt.% SiC has been reported to offer a balance of good ablation resistance and good retention of the mechanical properties via the formation of an effective protective oxide layer. 3,4,21 At the same time, there are only few reports on the ablation properties of HfC-SiC UHTCs.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature ablation of hot‐pressed HfC–SiC ceramics

Kolek,

Cooper,

Behler

et al. 2023

Int J Applied Ceramic Tech

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Effective thermal insulation materials rely on the fabrication of dense, ultra‐high‐temperature ceramics that can withstand harsh environments. Hafnium carbide‐based ceramics are one of the leading materials that have the potential to perform relatively well in high‐temperature oxidizing environments under mechanical loading due to their thermal and mechanical stability. In this study, we explore the effects of processing conditions to create dense, ablation‐resistant HfC–SiC composites with a fixed composition of HfC–20 wt.% SiC using a hot‐pressing method. Sintering pressure, temperature, and time were varied and the material's relative density, phase composition, morphology, microstructure, and hardness were investigated. Composite ceramics with 99% relative density relative to a theoretical value were created by hot pressing at 2100°C for 1 h at 50 MPa and displayed a fine microstructure with an average grain size of ∼5 µm and a Vickers hardness of 22.9 ± .8 GPa. The mass loss was determined using an oxyacetylene torch with cross‐section investigations of oxide surface formations and subsurface microstructural changes. These HfC–SiC samples developed a 410 nm hafnium oxide layer on the surface upon torch exposure and had an average calculated recession rate of .028 µm/s.

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“…Figure 6(e) displays the ablation rates of the HfC coatings. After the ablation, the coatings show negative ablation rates due to weight gain (HfO 2 : 210.50 g•mol −1 , HfC: 190.51 g•mol −1 ) and volume expansion (HfO 2 : 21.76 cm 3 •mol −1 , HfC: 15.32 cm 3 •mol −1 ) [36]. R m and R l of the toughened HfC coating (R m : −0.35 mg•s −1 , R l : −0.46 μm•s −1 ) decrease by 39.66% and 36.98%, respectively, compared with those of the pure HfC coating (R m : −0.58 mg•s −1 , R l : −0.73 μm•s −1 ).…”

mentioning

confidence: 99%

Novel Hf _xTa _{1−
x}C solid solution nanowire toughened HfC coating: An effective strategy for synchronous enhanced mechanical and anti-ablation performance

Chen,

Zhang,

et al. 2024

Journal of Advanced Ceramics

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Ultra-high-temperature ceramic nanowires have shown increasing potential for use as thermal structural components. Herein, novel single-crystal Hf 0.5 Ta 0.5 C solid solution nanowires were synthesized and incorporated with a HfC coating to construct a robust structure with Hf 0.5 Ta 0.5 C solid solution nanowires uniformly distributed and interconnected within the coating. The novel Hf 0.5 Ta 0.5 C solid solution nanowires could effectively hinder crack propagation through crack tip pinning and crack deflection. This mechanism substantially enhanced the elastic modulus and fracture toughness of the HfC coating by 53.29% and 59.67%, respectively. The toughened HfC coating displayed superior fracture toughness and good interfacial binding strength with the substrate to resist severe oxidation and scouring. Additionally, the high thermal conductivity of the toughened HfC coating promoted heat transmission. Thus, in comparison to the pure HfC coating, the toughened HfC coating displayed smaller mass and linear ablation rates of −0.35 mg•s −1 and −0.46 μm•s −1 , which decreased by 39.66% and 36.98%, respectively. Our work not only simultaneously enhances the mechanical properties and ablation resistance of HfC-coated carbon/carbon (C/C) composites but also provides novel prospects for advanced ultrahightemperature ceramic nanowires under extreme conditions.

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The Ablation and Oxidation Behaviors of SiC Coatings on Graphite Prepared by Slurry Sintering and Pack Cementation

Cited by 6 publications

References 34 publications

Effect of ZrB₂ and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB₂–SiC Coatings Produced by Slurry Brushing Method

Effect of ZrB₂ and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB₂–SiC Coatings Produced by Slurry Brushing Method

High‐temperature ablation of hot‐pressed HfC–SiC ceramics

Novel Hf _xTa _{1−
x}C solid solution nanowire toughened HfC coating: An effective strategy for synchronous enhanced mechanical and anti-ablation performance

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The Ablation and Oxidation Behaviors of SiC Coatings on Graphite Prepared by Slurry Sintering and Pack Cementation

Cited by 6 publications

References 34 publications

Effect of ZrB2 and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB2–SiC Coatings Produced by Slurry Brushing Method

Effect of ZrB2 and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB2–SiC Coatings Produced by Slurry Brushing Method

High‐temperature ablation of hot‐pressed HfC–SiC ceramics

Novel Hf x Ta 1− x C solid solution nanowire toughened HfC coating: An effective strategy for synchronous enhanced mechanical and anti-ablation performance

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About

Effect of ZrB₂ and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB₂–SiC Coatings Produced by Slurry Brushing Method

Effect of ZrB₂ and Polyvinyl Butyral Content on the Oxidation Resistance of ZrB₂–SiC Coatings Produced by Slurry Brushing Method

Novel Hf _xTa _{1−
x}C solid solution nanowire toughened HfC coating: An effective strategy for synchronous enhanced mechanical and anti-ablation performance