Ultrahigh temperature ceramic HfB2-SiC coating by liquid phase sintering method to protect carbon materials from oxidation

Ren, Xuanru; Mo, Hongsheng; Wang, Wenhao; Feng, Peizhong; Guo, Litong; Li, Ziyu

doi:10.1016/j.matchemphys.2018.07.018

Cited by 31 publications

(6 citation statements)

References 51 publications

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“…Oxidation and evaporation are common problems for carbon materials, which limit their applications at high temperatures. The development of methods for protecting oxidation of carbon materials has been given considerable attention lately [1].…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: SiC/nano α-Al2O3 Double-Layer Coating on Graphite Component via Pack Cementation and Electrophoretic Deposition

2020

Preprint

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: SiC/nano α-Al2O3 Double-Layer Coating on Graphite Component via Pack Cementation and Electrophoretic Deposition

2020

Preprint

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“…In addition, HfO2 could react with SiO2 according to reaction (3) and HfSiO4 particles might also be formed. Due to the higher melting points of HfO2 and HfSiO4 (<2500 °C), as compared to the glass layer (1650°C), the presence and homogeneous distribution of these crystals in the glass layer improved the stability of the glass layer [43]. Also, according to Figure 10, microcracks were observed on the surface of the oxide layer of the sample G0.…”

Section: Resultsmentioning

confidence: 96%

“…Researchers believe that due to the high viscosity of the glass layer, this layer could not flow near these bubbles and cover the open bubbles. These bubbles could be attributed to the accumulation of gaseous products due to the active oxidation of SiC at the high temperature of 1400 °C (reaction ( 6)), as well as the evaporation of B2O3 [43].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, in this method, due to the spark between the powder particles and the use of direct pulse flow, materials with poor sinterability can be successfully compacted [13]. Also, up to now, metal additives (Fe, Ni, Co, W), nitrides (AlN, HfN, Si3N4), carbides (SiC, HfC, WC, VC) and desilicides (MoSi2, HfSi2, TiSi2, TaSi2) have been used to improve the sintering and mechanical properties of HfB2 ceramics [14][15][16][17][18][19][20][21][22]. The addition of SiC as the most common carbide additive to HfB2 not only improves its sinterability, but also enhances its mechanical properties and oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Graphite Addition on the Microstructure, Mechanical Properties and Oxidation Resistance of HfB2-SiC Composites Prepared by the SPS Method

Sakvand

Shojaie-Bahaabad

Nikzad

2022

IJE

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In this study, HfB2-SiC-graphite composites were fabricated using spark plasma sintering at 1900 ℃ for 10 min. The effect of graphite content on the microstructure and mechanical properties was studied; also, oxidation resistance of the prepared composites was investigated at 1400 ℃ for 32 h. Weight changes and thickness of the formed oxide layer were measured. The relative density, toughness and strength of the SPSed composites increased with raising graphite up 2.5 wt% and then decraesed. On the other hand, the hardness of the composites was decreased when graphite was added. Oxidation resistance of the composites was, thus, improved following graphite addition up 2.5 wt%, while the ecessive quantity of graphite caused poor oxidation resistance of the composites.

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“…However, the characteristics of effortless oxidation above 673 K prominently constrain the application of carbon structural materials. Therefore, coating technology develops the best choice to heighten the high-temperature performance of carbon structural materials [6,7].…”

Section: Introduction mentioning

confidence: 99%

Preparation of ZrB2-MoSi2 high oxygen resistant coating using nonequilibrium state powders by self-propagating high-temperature synthesis

et al. 2021

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To achieve high oxygen blocking structure of the ZrB2-MoSi2 coating applied on carbon structural material, ZrB2-MoSi2 coating was prepared by spark plasma sintering (SPS) method utilizing ZrB2-MoSi2 composite powders synthesized by self-propagating high-temperature synthesis (SHS) technique as raw materials. The oxygen blocking mechanism of the ZrB2-MoSi2 coatings at 1973 K was investigated. Compared with commercial powders, the coatings prepared by SHS powders exhibited superior density and inferior oxidation activity, which significantly heightened the structural oxygen blocking ability of the coatings in the active oxidation stage, thus characterizing higher oxidation protection efficiency. The rise of MoSi2 content facilitated the dispersion of transition metal oxide nanocrystals (5–20 nm) in the SiO2 glass layer and conduced to the increasing viscosity, thus strengthening the inerting impact of the compound glass layer in the inert oxidation stage. Nevertheless, the ZrB2-40 vol%MoSi2 coating sample prepared by SHS powders presented the lowest oxygen permeability of 0.3% and carbon loss rate of 0.29×10−6 g·cm−2·s−1. Owing to the gradient oxygen partial pressure inside the coatings, the Si-depleted layer was developed under the compound glass layer, which brought about acute oxygen erosion.

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Ultrahigh temperature ceramic HfB2-SiC coating by liquid phase sintering method to protect carbon materials from oxidation

Cited by 31 publications

References 51 publications

WITHDRAWN: SiC/nano α-Al2O3 Double-Layer Coating on Graphite Component via Pack Cementation and Electrophoretic Deposition

WITHDRAWN: SiC/nano α-Al2O3 Double-Layer Coating on Graphite Component via Pack Cementation and Electrophoretic Deposition

Effect of Graphite Addition on the Microstructure, Mechanical Properties and Oxidation Resistance of HfB2-SiC Composites Prepared by the SPS Method

Preparation of ZrB2-MoSi2 high oxygen resistant coating using nonequilibrium state powders by self-propagating high-temperature synthesis

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