Oxidation inhibition behaviors of the HfB2-SiC-TaSi2 coating for carbon structural materials at 1700 °C

Zhang, Menglin; Ren, Xuanru; Chu, Hongao; Lv, Junshuai; Li, Wei; Wang, Weiguang; Yang, Qingqing; Feng, Peizhong

doi:10.1016/j.corsci.2020.108982

Cited by 54 publications

(31 citation statements)

References 44 publications

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“…HfB 2 (1‐3 μm, 99.5% purity), MoSi 2 (300 meshes, 99.9% purity), and SiC (300 meshes, 99.5% purity) made by Beijing Lisheng Innovative Metal Materials Technology Co. were used as the raw coating materials. The powders were weighed according to the designed mass fraction first, then milled in a ball mill at 300 r/min for 5 h. Next, the mixed powders were dried in an oven at 343 K for 24 h 33,34 …”

Section: Experiments Proceduresmentioning

confidence: 99%

Oxidation inhibition behaviors of HfB₂‐MoSi₂‐SiC oxygen blocking coating prepared by spark plasma sintering

et al. 2021

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The HfB2‐MoSi2‐SiC oxygen blocking coatings were prepared by the spark plasma sintering (SPS) technique, whose oxidation inhibition ability was further strengthened by the pre‐oxidation treatment. The effect of MoSi2 content and pre‐oxidation treatment process on the oxygen blocking ability of the HfB2‐MoSi2‐SiC coating at 1973 K were conducted. After SPS, for the HfB2‐MoSi2‐SiC coatings with 20 wt%, 40 wt%, and 60 wt% MoSi2, the relative density of the coatings are 92.6%, 93.9%, and 85.6%, respectively. Owing to the enhanced compactness of the coatings, increasing MoSi2 content can significantly improve the protection efficiency of the coatings during the activation oxidation stage. However, due to the increased formation of gaseous by‐products during the inerting oxidation stage, excessive MoSi2 weaken the oxidation inhibition ability of the coatings. The sufficient dispersion of Hf‐oxides nanocrystals in the glass layer conduces to enhance the oxygen blocking ability of the glass layer, making the 40HfB2‐40MoSi2‐20SiC coating present the best oxidation protective ability. The pre‐oxidation treatment at 1773 K conduces to form the steady glass layer with fewer defects at the cost of a lower oxidation consumption of the coating, which enhanced the protection efficiency of the coating from 96.9% to 99.8% and reduced the oxygen permeability from 0.13% to 0.028%.

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Section: Experiments Proceduresmentioning

confidence: 99%

Oxidation inhibition behaviors of HfB₂‐MoSi₂‐SiC oxygen blocking coating prepared by spark plasma sintering

et al. 2021

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“…The addition of UHTC into silicides can overcome the deficiency of the traditional Si-based ceramic coatings, i.e., SiC easily takes place active oxidation at low oxygen partial pressures or temperatures higher than 1700 ℃ [5, [291][292][293]. Various methods including pack cementation (PC) [292,[294][295][296][297][298][299], CVD [300][301][302][303][304][305][306][307][308][309][310][311], plasma spray (PS) [293,[312][313][314][315][316], slurry-sintering (SS) [317,318], and hot pressing (HP) [52,319,320] have been developed to prepare UHTC coatings. The selection of the UHTC coatings highly depends on the requirements of the target applications (aero-thermo-chemical demands) and the feasibilities of their processing routes (cost and specific shaping availability).…”

Section: Composition and Microstructure Design Of Uhtc Coatingsmentioning

confidence: 99%

Advances in ultra-high temperature ceramics, composites, and coatings

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Ultra-high temperature ceramics (UHTCs) are generally referred to the carbides, nitrides, and borides of the transition metals, with the Group IVB compounds (Zr & Hf) and TaC as the main focus. The UHTCs are endowed with ultra-high melting points, excellent mechanical properties, and ablation resistance at elevated temperatures. These unique combinations of properties make them promising materials for extremely environmental structural applications in rocket and hypersonic vehicles, particularly nozzles, leading edges, and engine components, etc. In addition to bulk UHTCs, UHTC coatings and fiber reinforced UHTC composites are extensively developed and applied to avoid the intrinsic brittleness and poor thermal shock resistance of bulk ceramics. Recently, highentropy UHTCs are developed rapidly and attract a lot of attention as an emerging direction for ultra-high temperature materials. This review presents the state of the art of processing approaches, microstructure design and properties of UHTCs from bulk materials to composites and coatings, as well as the future directions.

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“…To quantitatively evaluate the antioxidant capacity of the ZrB 2 -MoSi 2 system, based on our previous work [22], Eqs. (1)-( 6) characterized the dynamic protection process of the coatings in various oxidation stages.…”

Section: Evaluation Of Oxygen Blocking Abilitymentioning

confidence: 99%

“…To improve the structural oxygen blocking ability of the coating, it is necessary to develop densification sintering technique at a lower temperature [22]. Spark plasma sintering (SPS) is well known as the low-temperature pressured rapid sintering technology, which can remarkably inhibit grain growth as well as bringing high density under pressure conditions [23][24][25].…”

Section: Introduction mentioning

confidence: 99%

“…Spark plasma sintering (SPS) is well known as the low-temperature pressured rapid sintering technology, which can remarkably inhibit grain growth as well as bringing high density under pressure conditions [23][24][25]. In our previous work, HfB 2 -SiC-TaSi 2 coating [22] and ZrB 2 -SiC coating [13] have been prepared by SPS technology, both of which reveal excellent hightemperature oxidation resistance.…”

Section: Introduction mentioning

confidence: 99%

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

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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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Oxidation inhibition behaviors of the HfB2-SiC-TaSi2 coating for carbon structural materials at 1700 °C

Cited by 54 publications

References 44 publications

Oxidation inhibition behaviors of HfB₂‐MoSi₂‐SiC oxygen blocking coating prepared by spark plasma sintering

Oxidation inhibition behaviors of HfB₂‐MoSi₂‐SiC oxygen blocking coating prepared by spark plasma sintering

Advances in ultra-high temperature ceramics, composites, and coatings

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

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Oxidation inhibition behaviors of the HfB2-SiC-TaSi2 coating for carbon structural materials at 1700 °C

Cited by 54 publications

References 44 publications

Oxidation inhibition behaviors of HfB2‐MoSi2‐SiC oxygen blocking coating prepared by spark plasma sintering

Oxidation inhibition behaviors of HfB2‐MoSi2‐SiC oxygen blocking coating prepared by spark plasma sintering

Advances in ultra-high temperature ceramics, composites, and coatings

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

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Oxidation inhibition behaviors of HfB₂‐MoSi₂‐SiC oxygen blocking coating prepared by spark plasma sintering

Oxidation inhibition behaviors of HfB₂‐MoSi₂‐SiC oxygen blocking coating prepared by spark plasma sintering