CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ciwang Quan,Xianjun Yang,Jiajun Luo,Ziqiao Wang,Yushuai Feng,Jianjun Zhang,Weihua Chen,Bingliang Liang
MoSi 2 is a promising candidate for high-temperature, structural materials. However, their oxidation resistance is poor below 600 °C. To prevent MoSi 2 from being oxidized at low temperatures, core-shell structured MoSi 2 @ZrO 2 powder were prepared by hydrothermal-calcination approach. First, MoSi 2 @Zr(OH) 4 core-shell composite powder with nano-sized Zr(OH) 4 shell particles were synthesised using a hydrothermal method . Subsequently, the MoSi 2 @ZrO 2 core-shell structured powder were obtained by calcination of the MoSi 2 @Zr(OH) 4 powders at 900 °C for 2h. Finally, microstructure and oxidation behaviour of the MoSi 2 @ZrO 2 powder at 400 °C–600 °C in air were investigated systematically. Microstructural analysis revealed that all samples had a distinct core-shell structure, and the ZrO 2 shells coated the surface of the MoSi 2 core. Oxidation behaviour studies showed that the dense ZrO 2 shell layer could isolate the MoSi 2 surface from oxygen, improving the low-temperature oxidation resistance and providing better low-temperature antioxidant properties than those of the MoSi 2 and MoSi 2 @Zr(OH) 4 core-shell structures.
研究领域:
材料科学
·
高温材料
·
氧化行为研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Sainan Liu,Hongtai Shen,Jiawei Xu,Xiaojun Zhou,Jianfei Liu,Zhenyang Cai,Xiaojun Zhao,Lairong Xiao
To develop an ultra-high-temperature resistant coating for a reusable thermal protection system, the preparation of a tantalum-based MoSi 2 -Mo coating by a new two-step process of multi-arc ion plating and halide activated pack cementation is presented. The coating has a dense structure and is well compatible with the tantalum substrate, which can be thermally shocked from room temperature to 1750 °C for 360 cycles without failure. The mechanism of the coating’s excellent resistance to high-temperature thermal shocks is that a strong-binding gradient interface and a dense SiO 2 oxide scale with good oxygen resistance are formed by the high-temperature self-diffusion of Si.
研究领域:
材料科学
·
高温防护技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shiquan Zhang,Jian Zhang,Sheng Hu,Ruizhi Zhang,Junguo Li,Qiang Shen
Ablative thermal protection materials are widely used in entry and re-entry vehicles which benefit from their strong adaptability. However, long-term ablation has been a limitation due to the consumption of the matrix of the ablative materials. In this work, the microstructure evolution and ablation properties of the MoSi 2 /mica-modified CF/BPR composites with and without hollow silicate glass microspheres (HSMs) under protracted ablation have been investigated. The mass ablation rates decreased while the linear ablation rates increased when the ablation times were prolonged. The composites with 30 vol.% HSMs have good insulation properties, shown by a lower backside temperature of 240.9 °C after 100 s of ablation. The decrease in thermal conductivity limited heat transfer in both the axial and horizontal directions. This led to heat concentration and severe ablation at the central surface. The three-dimensional porous and the ladder structure formed in the transfer region, and the features gradually disappeared while extending the ablation times because of the flame erosion and formed liquid phases. The heat diffusion and concentration within the matrix established a gradient temperature field, which determined the ablation behavior and mechanism, providing valuable insights for the development of advanced ablative thermal protection materials.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shiquan Zhang,Jian Zhang,Suohui Yang,Minxian Shi,Junguo Li,Qiang Shen
Ablation material had been widely used in aerospace attributed to its reliability and strong adaptability but was usually accompanied by low strength at higher temperatures. Here, a high flexural strength of 66.91 MPa after ablation at 1500 °C of carbon fiber/boron phenolic resin (CF/BPR) composite modified by MoSi 2 and mica was reported. With the proportion of MoSi 2 and mica was 9:1, the formed appropriate content of the liquid phase improved the reactivity of MoSi 2 powders and provided a suitable interfacial state between CF and the matrix. The result of the oxygen-acetylene test showed that the mass ablation and the linear ablation reduced to 0.034 g/s and 0.006 mm/s, respectively. Owing to the formed liquid phase wrapping the carbon fiber and ceramic layer on the surface improved the ablation resistance. These high-strength CF/BPR composites have strong potential in new aerospace materials.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Jia-Qi Zheng,Jian Chen,Xue-Jian Liu,Zheng-Ren Huang,Jun-Jun Chen
Highly conductive SiC-MoSi 2 -AlN composites were fabricated by β-SiC, AlN and MoSi 2 powders with Y 2 O 3 additive via pressureless sintering. The effect of MoSi 2 content on the microstructure, mechanical and electrical properties of SiC-MoSi 2 -AlN composites was systematically investigated. A finer microstructure was obtained and electrical conductivity was enhanced with increasing MoSi 2 content. The impedance spectroscopy and potential-current measurements were implemented to figure out the electrical conduction mechanism. The introduction of MoSi 2 effectively reduced the Schottky barrier height at the grain boundary, and subsequently the U-I curves changed from nonlinear to linear electrical characteristics . The notable decrease in electrical resistivity was owing to the breakdown of grain boundaries and the formation of percolation paths. The percolation threshold was in the range of 0–5.44 vol% MoSi 2 , much lower than the reference value. The composites with 10 wt% MoSi 2 exhibited an electrical resistivity of about 60 Ω cm, suitable for infrared source element applications.
研究领域:
材料科学
·
电气工程
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Liyun Cao,Zhe Bai,Jianfeng Huang,Haibo OuYang,Jianpeng Wu
The effects of hydrothermal penetration temperature on the ablation properties of C f /C-SiC-MoSi 2 composites were studied. With the hydrothermal temperature rising, the distribution depth of ceramics along the cross-section of the composites increased. Meanwhile, the increase in densities and the decrease in porosities of the composites were achieved. When the penetration temperature reached 200 °C, the composites showed the best ablation properties after plasma ablation test for 60 s at 2300 °C. The mass ablation rate was 2.28 mg cm −2 s −1 , which decreased by 65%, 54% and 29% compared to composites prepared at 140 °C, 160 °C and 180 °C, respectively. Also the sample prepared at 200 °C showed the lowest linear ablation rate. The increasing depth and amount of ceramics in the composites could provided SiC and MoSi 2 continuously to prevent the oxidation of carbon, rather than be easily blown away by strong scouring force. The good ablation behavior is attributed to the higher density and amounts of ceramics, the generation of SiO 2 and MoO 2 .
研究领域:
材料科学
·
复合材料
·
热防护系统
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Lairong Xiao,Xueqing Xu,Sainan Liu,Ziqi Shen,Siyu Huang,Wentao Liu,Yuqing Peng,Yali Huang,Jianfei Liu,Yanchun Nie,Xiaojun Zhao,Zhenyang Cai
Tantalum (Ta) alloys are important ultra-high-temperature structural materials owing to their excellent high-temperature mechanical properties and processability. However, they exhibit poor high-temperature oxidation resistance. In this study, a dense MoSi 2 ceramic coating was prepared on a Ta substrate using an innovative multi-arc ion plating process and halide activated pack cementation in order to improve its ultra-high-temperature oxidation resistance. This ceramic coating exhibited a low roughness space arithmetic (287.1 ± 26.3 nm) and a dense structure. The relationship between the thickness of the coating and the duration of pack-cementation at 1250 ℃ was parabolic. The coating had a service life of more than 12 h at 1750 ℃, and showed excellent high-temperature oxidation resistance because of the uniform and dense structure of the coating and the rapid formation of a dense SiO 2 layer with low O 2 permeability during high-temperature oxidation.
研究领域:
材料科学
·
表面工程
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Shiyu Cui,Zhou Yi,Yi Xu,Jun Huang,Jilin Xu,Junming Luo,Qiong Jiang,Jiayi Peng,Xiaoma Tao
Molybdenum disilicide (MoSi 2 ) is a novel crack-healing material used in the traditional thermal barrier coating , which reacts with ZrO 2 to attain a corresponding volume expansion of approximately 138%. However, the pre-oxidation of MoSi 2 causes the “pesting” phenomenon, which degrades the microstructure and mechanical properties throughout the service. To address this issue, the aluminum oxide was fabricated on the MoSi 2 surface using the sol-gel method and low-pressure post-heat treatment to prevent oxygen penetration. The orthogonal experiment investigated the effect of pH, temperature, and water amount on sol generation. Because the Zeta potential difference has reached its maximum value (about 27 mV) at pH 4, the aluminum sol was notably adsorbed on the MoSi 2 particles. The modified MoSi 2 @Al 2 O 3 particles were characterized to understand their morphologies, surface adsorption energy, and crystal structures. The oxygen adsorption energy on the MoSi 2 (103) surface was lower than that on the Mo 5 Si 3 (411) surface, which indicated that the oxidization process can be divided into two independent steps. The Al 2 O 3 shell was uniformly formed on the MoSi 2 particles, especially in the low-vacuum environment (10 MPa) for 3 h post-treatment. The dense core-shell structure can prevent oxygen penetration into the MoSi 2 surface, thus prolonging the self-healing property of MoSi 2 .
研究领域:
材料科学
·
表面工程
·
涂层技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yong Deng,Xinran Gao,Ying Li,Huanfang Wang,Minxian Shi,Chao Zhang
The incorporation of inorganic fillers has demonstrated remarkable potential in enhancing ablation resistance and mechanical performance of polymer composites. However, the evolution of fracture properties of ceramizable composites with temperature remains insufficiently understood, which is significant to the safety and application in thermal protection systems. In this study, the thermal stability, high-temperature flexural properties, and failure mechanisms of MoSi 2 –B 4 C particles modified quartz fabric/boron-phenolic ceramizable composites were investigated. Through three-point bending tests conducted from 25°C to 1100°C, we found that flexural strength generally declines with the rising temperature and decreases as the holding time increases from 10 to 15 min. The high-temperature failure mechanisms of the ceramizable composites were analyzed through macro and micro analysis. It is found that the matrix thermal degradation, accompanied by interface deterioration and multiscale structural damage, is the primary mechanism for the significant reduction in high-temperature flexural strength. However, the ceramization reactions of MoSi 2 and B 4 C contribute to enhanced high-temperature mechanical properties, resulting in an unprecedented improvement in flexural strength observed at 900°C. Moreover, a high-temperature strength model for these ceramizable composites was developed. These findings provide valuable insights for evaluating the performance and potential applications of ceramizable composites in thermal protection systems.
研究领域:
材料科学
·
复合材料
·
高温材料
·
力学性能
·
热防护系统
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 106
·期 2
·393-405
·
IF 2.606
Dai Tao,Wu Zhanwu,Wang Zihan,Cui Sheng,Wu Xiaodong,Zhu Xiaofei
Fiber-reinforced aerogels with excellent properties such as low density and low thermal conductivity are potential thermal insulation materials. The slurry method and the embedding sintering method were used to fabricate MoSi 2 -aluminoborosilicate glass coatings on the surface of a carbon fiber-reinforced C-Al 2 O 3 aerogel composite under a low-oxygen atmosphere. The microstructure and phase composition of the coatings with different MoSi 2 contents before and after static oxidation were investigated. The resulting composite exhibited excellent radiating properties and outstanding oxidation resistance. The total emissivity of the as-prepared coatings was above 0.8185 in the wavelength range of 300–2500 nm. The sample with 40 wt% MoSi 2 in the outer coating had superior thermal endurance with a weight loss of only 0.54% after isothermal oxidation at 1200 °C for 180 min. This can be attributed to the optimum viscosity of the binder, which would relieve thermal stress defects and block oxygen diffusion. To further evaluate the thermal protection performance of the coatings, the heat transfer characteristics were simulated using the Fluent software package.
Graphical abstract
研究领域:
材料科学
·
热工程
·
涂层技术
·
气凝胶复合材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Zhiwu Jiang,Gaoming Zhu,Peizhong Feng,Farid Akhtar
Mo, Si and B 4 C powders were used to fabricate 0.4MoB-0.1SiC- x MoSi 2 composites by self-propagating high-temperature synthesis (SHS) and hot pressing (HP). The effects of MoSi 2 content ( x = 1, 0.75, 0.5 and 0.25) on phase composition, microstructure and properties of the composites were investigated. The results showed that the 0.4MoB-0.1SiC- x MoSi 2 composite exhibited Vickers hardness of 10.7–15.2 GPa, bending strength of 337–827 MPa and fracture toughness of 4.9–7.0 MPa m 1/2 . The fracture toughness increased with the increasing volume fraction of MoB and SiC particles which were promoted by the toughening mechanisms, such as crack bridging, cracks deflection and crack branching. Moreover, the electrical resistivity showed an increasing trend with decreasing volume fraction of MoSi 2 .
研究领域:
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 22
·33967-33975
·
IF 5.532
Ya-nan Li,Ping Wu,Shiping Zhang,Yili Pei,Jinguang Yang,Sen Chen,Li Wang
Adding nanoparticles is a method to regulate the performance of thermoelectric materials. Ca 3 Co 4 O 9 /x MoSi 2 (x = 0, 0.05, 0.10, 0.13, and 0.16) was synthesized by a wet chemical method combined with atmospheric pressure sintering. The XRD and SEM results reveal that there are no other reaction in the samples. The grain size of all samples decrease with increasing MoSi 2 content, and all presented a similar flake morphology. The influence of MoSi 2 on the thermoelectric performance of Ca 3 Co 4 O 9 is systematically analysed. The appropriate addition of nano-MoSi 2 particles can increase the carrier concentration and enhance conductivity of Ca 3 Co 4 O 9 . The electrical conductivity of Ca 3 Co 4 O 9 /0.05 MoSi 2 is 83.16 Scm −1 , which is 49.2% higher than that of Ca 3 Co 4 O 9 at 1080 K. The Seebeck coefficient of the Ca 3 Co 4 O 9 /0.16 MoSi 2 sample reaches 197.56 μVK −1 at 980 K, which is significantly better than that of previously reported samples prepared by the same method. Moreover, combined with the experimental results and the analysis of the effective medium theory model, the addition of MoSi 2 can effectively debase the thermal conductivity of Ca 3 Co 4 O 9 . The thermal conductivity of Ca 3 Co 4 O 9 /0.16 MoSi 2 (∼1.26 Wm −1 K −1 , 1080 K) samples decrease greatly, which is attributed to the influence of interfacial thermal resistance and pores in the Ca 3 Co 4 O 9 /MoSi 2 . The ZT value of the Ca 3 Co 4 O 9 /0.05 MoSi 2 sample increases by 44.4% compare with that of Ca 3 Co 4 O 9 and reaches 0.26 at 1080 K. These results demonstrate that adding an appropriate amount of MoSi 2 particles is one of the methods to enhance the thermoelectric performance of Ca 3 Co 4 O 9 ceramic samples.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
·
热电转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）