SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Dongmei Pu,Pengju Chen,Peng Xiao,Zhuan Li,Pingyi Deng,Liang Pang,Jinwei Li,Yang Li
A dense and uniform c -AlPO 4 and SiC whisker co-modified mullite coating was successfully prepared on SiC-coated C/SiC composites with a thickness of about 70 μm by hydrothermal electrophoretic deposition . The thermal cycling performance of the coating samples was evaluated by thermally cycling between 1773 K and room temperature in a corundum tube furnace. Results show that the addition of SiC whisker (SiC w -mullite coating) significantly improved the thermal cycling resistance of single mullite outer layer on account of the toughening mechanism of SiC whiskers, such as whisker bridging and crack deflection. Then, the addition of c -AlPO 4 ( c -AlPO 4 -SiC w -mullite coating, termed ASM coating) further improved the thermal cycling resistance on account of the healing and bonding performances of c -AlPO 4 at high temperature. After 40 thermal cycles, the weight loss of ASM coating on SiC-coated C/SiC composites was 4.5% compared to 5.24% for the SiC w -mullite coating. The retention rate of compressive strength of ASM coating on SiC-coated C/SiC matrix was 80.66% compared to 73.65% for the SiC w -mullite coating.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2019
·
IF 6.355
Haibo Ouyang,Yulei Zhang,Cuiyan Li,Guibiao Li,Jianfeng Huang,Hejun Li
C/C-ZrC-SiC composites were fabricated by carbothermal reaction of hydrothermal co-deposited oxides and resulted in homogeneous microstructure. The fracture behavior passed from pseudo-plastic to brittle fracture with the increase in ZrC/SiC molar ratios. The composites with a molar ratio of ZrC/SiC≈2:1 presented outstanding ablation resistance with a mass ablation rate of 0.06 mg cm −2 s −1 and a linear ablation rate of 0.13 μm s −1 . The optimal ZrC/SiC molar ratio provided a suitable balance of viscosity and flowability of the oxides scale, which not only possessed enough solid ZrO 2 to endure the scouring but also had moderate liquid-phase to seal the defects and limited the oxidation.
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
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 3
·1740-1752
·
IF 2.1
Ling Pan,Pengju Chen,Peng Xiao,Ling He,Wei Zhou,Yang Li
The mullite and ytterbium disilicate (β-Yb 2 Si 2 O 7 ) powders as starting materials for the Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating are synthesized by a sol–gel method. The effect of SiC whiskers on the anti-oxidation properties of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating for C/SiC composites in the air environment is deeply studied. Results show that the formation temperature and complete transition temperature of mullite were 800–1000 and 1300°C, respectively. Yb 2 SiO 5 , α-Yb 2 Si 2 O 7 , and β-Yb 2 Si 2 O 7 were gradually formed between 800 and 1000°C, and Yb 2 SiO 5 and α-Yb 2 Si 2 O 7 were completely transformed into β-Yb 2 Si 2 O 7 at a temperature above 1200°C. The weight loss of Yb 2 Si 2 O 7 /(SiC w –mullite)/SiC tri-layer coating coated specimens was 0.15 × 10 −3 g cm −2 after 200 h oxidation at 1400°C, which is lower than that of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating (2.84 × 10 −3 g cm −2 ). The SiC whiskers in mullite middle coating can not only alleviate the coefficient of thermal expansion difference between mullite middle coating and β-Yb 2 Si 2 O 7 outer coating, but also improve the self-healing performance of the mullite middle coating owing to the self-healing aluminosilicate glass phase formed by the reaction between SiO 2 (oxidation of SiC whiskers) and mullite particles.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 1
·e20151
·
IF 3.5
Zhitong Xu,Jian Zhao,Malin Liu,Zebing Liu,Xinyu Cheng,Jiaxing Chang,Xu Yang,Bowen Li,Bing Liu,Rongzheng Liu
Developing high strength and tough silicon carbide (SiC) composite ceramics remains a significant challenge. Here, we report the process of synthesizing fully densified SiC/C composite ceramics using SiC@graphene (SiC@G) core–shell nanoparticles as raw materials through spark plasma sintering (SPS) at 1700°C and 45 MPa. The SiC@G nanoparticles were synthesized by the fluidized bed chemical vapor deposition (FB-CVD) method. During the sintering process, graphene coated, the surface of nanosized SiC particles exhibited high electrical and thermal conductivity, facilitating the uniform distribution of pulse current and heat and promoting the densification of SiC/C composite ceramics. For the prepared SiC/C composite ceramic, the carbon content reaches as high as 14.3 wt%, with carbon uniformly dispersed in a particulate form within the SiC matrix and stable interface bonding. Consequently, the introduction of excessive carbon does not compromise the hardness (28.8 GPa) and flexural strength (517.34 MPa) of the SiC/C composite ceramics. Furthermore, the carbon particles effectively enhance the toughness of the SiC/C composite material through mechanisms such as crack branching, bridging, and deflection, resulting in a fracture toughness of 7.38 MPa m 1/2 . The preparation strategy in this study provides a novel route for sintering SiC composites with high-carbon content through nanoscale powder structure design, resulting in the attainment of high-performance lightweight composite materials.
研究领域:
材料科学
·
复合材料
·
纳米技术
·
陶瓷
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6410-6421
·
IF 3.5
Hao Chen,Jianjun Chen,Jiahao Yang,Zahoor Ahmad,Mingming Zhu,Yilian Xiong,Jiyu Tao,Jinxia Li
In this work, stacked SiC fibers paper-reinforced SiC ceramic matrix composites (SiC nf /SiC CMCs) were prepared by nanoimpregnation and transient eutectic (NITE) process using ultra-long single-crystal SiC nanofibers. The effect of the SiC nf surface modification via boron nitride (BN) interphase deposition as well as the sintering additive (Al 2 O 3 –Y 2 O 3 ) content on the density, microstructure, and mechanical properties of SiC nf /SiC CMCs has been investigated systematically. The results revealed that the laminated SiC nf /SiC CMCs feature a significant saw-tooth-like curve on the load–displacement test, which indicates that the obtained laminated structure with the weak interlayer binding owning to the BN coating treatment possesses significant toughening to the SiC ceramics. Specifically, the SiC nf /SiC CMCs with the sintering additive content of 12 wt% revealed a fracture toughness of over 10 MPa m 1/2 after 60 min of BN interface deposition, which is 104.31% higher than that of the composites prepared without BN coating.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinli Ye,Haiyang Zhang,Hao Yu,Jianqing Xu,Shan Li,Xiaomin Ma,Wei Xu,Junxiong Zhang
High-performance SiC aerogels are sought after for their superior thermal insulation and absorption properties, especially in applications such as electromagnetic stealth for aero engines and high-temperature radar stealth. However, achieving SiC aerogel with both temperature resistance and strong wave absorption while controlling their properties remains a significant challenge. This study investigates the influence of reactant concentrations on the structure, thermal insulation, and absorption performance of SiC aerogels synthesized via the sol-gel method. The aerogel synthesized with a n(C):n(Si) ratio of 1:2 showed superior thermal insulation. Additionally, it showed excellent electromagnetic wave absorption, with a minimum reflection loss of −53.80 dB at 6.16 GHz and a maximum effective absorption bandwidth of 3.10 GHz at a thickness of 2.40 mm. Furthermore, the maximum compressive strength of C/SiC@SiC reached 0.98 MPa, a notable improvement of 81.48 % compared to the pristine C/SiC matrix. The maximum effective absorption bandwidth of C/SiC@SiC was increased to 6.06 GHz at 2.35 mm, and the surface center temperature decreased from 183.1 °C for C/SiC to 130.1 °C for C/SiC@SiC. Overall, this study offers valuable insights into the development of advanced absorption and thermal insulation materials, providing a foundation for further research and innovation in this field.
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
KEY ENGINEERING MATERIALS
·
2012
·
IF 0
Yang Hou,Ping Hu,Wen Bo Han
The dispersion of SiC nanopowders in ethanol solution was studied by sedimentation test, particle size measurement and TEM analysis. The dispersion behavior of SiC nanopowders in ethanol solution was strongly dependent on the pH values, types and amounts of dispersant. PEI was found to be effective for the dispersion of SiC nanopowders in ethanol solution. With the addition of PEI, the isoelectric points of SiC nanopowders in ethanol solution were at pH 9.5, and shift to pH 12.3. The stability of SiC suspension increased with the dispersant content increasing until reached 2.5 wt% PEI. The suitable pH value for the dispersion of SiC nanopowders should lower than 10.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2011
·
IF 1.472
Xinghong Zhang,Yang Hou,Ping Hu,Wenbo Han,Junting Luo
The dispersion and co-dispersion behavior of ZrB 2 and SiC nanopowders in ethanol solution was studied by sedimentation test, particle size measurement and transmission electron microscope (TEM) analysis. The dispersion behavior of ZrB 2 and SiC nanopowders in ethanol solution was strongly dependent on the pH values, types and amounts of dispersant. PEI was found to be effective for the dispersion of both ZrB 2 and SiC nanopowders in ethanol solution. With the addition of PEI, the isoelectric points of ZrB 2 and SiC nanopowders in ethanol solution were at pH 10 and pH 9.5, and shift to pH 13 and pH 12.3, respectively. The stability of ZrB 2 suspension increased with the dispersant content increasing until reached 0.7 wt% and well-dispersed SiC slurry can be obtained with more than 2.5 wt% PEI. The suitable pH value for the dispersion of ZrB 2 and SiC nanopowders should be lower than 12 and 10, respectively. The well co-dispersed ZrB 2 and SiC nanocomposite powders can be achieved by using 1 wt% or more PEI below pH 10.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Tianxiang Hong,Yuhong Chen,Ruibin Liu,Wanxiu Hai,Xiuling Zhang,Meiling Liu,Suo Yan
In this study, diamond/silicon carbide (SiC) composites were prepared by liquid Si infiltration. The effects of the infiltration temperature on the densification, diamond graphitization, and thermal conductivity of the composites were investigated. The effects of the diamond content on the thermal conductivity and bending strength were also explored. X-ray diffraction and Raman spectroscopy detected diamond graphitization at an infiltration temperature of 1480°C. Almost no graphitized diamond was observed due to reactions between silicon and carbon to form SiC at infiltration temperatures higher than 1480°C. As the infiltration temperature increased, graphitized diamond was consumed, and the thermal conductivity of the composite rose. The thermal conductivity and bending strength of the composites depended on the diamond content, reaching values of 257 W/m K and 237 MPa, respectively, for the sample with a diamond content of 17.9 vol.%. The higher bending strength was mainly ascribed to the high diamond content and well-bonded interface.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Juan Wang,Yongzhao Yang,Lijuan Zhou,Feng Hu,Peng Wang,Wuhong Xin,Fushun Yu,Shuang Li
Silicon carbide (SiC) ceramic membranes fabricated by recrystallization sintering can be used in some harsh environments because of their remarkable chemical and thermal stabilities. However, the commercial membranes can only meet the demands of microfiltration applications because of the challenge in pore-size control during recrystallization sintering. Here, a SiC ultrafiltration membrane with triple-layer asymmetric structures was prepared with micro-scale SiC particles for the substrate and nano-scale SiC particles for the selective layer. Defects-free selective layers were successfully coated on the high-purity SiC substrate by spin coating. The average pore size of the membrane was 60 nm when sintered at 1300 ℃. The surface roughness of the membrane increased with the increase in sintering temperature, leading to the improvement in hydrophilicity. Oil-in-water emulsion filtration analysis found that the oil rejection of the membrane exceeded 99.9 %. Thus, this SiC UF membrane provides new possibility to treat the corrosive and oily wastewaters.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Tianlong Liu,Lixia Yang,Zhaofeng Chen,Mengmeng Yang,Le Lu
In this work, the SiC ceramics were fabricated by stereolithography (SLA) combined with reactive melt infiltration (RMI), and the microstructure and mechanical properties of SiC ceramics were optimized by adjusting the solid content and impregnating phenolic resin. The bulk density and bending strength of SiC ceramics were positively correlated with the proportion of SiC content. The SiC phase content was increased from 48.10% to 61.42% with the solid content increased from 30 vol% to 45 vol%. When the solid content was 40 vol%, the bulk density and bending strength of SiC ceramics attained the highest value of 2.85 g/cm 3 and 234.8 MPa. Meanwhile, the pyrolysis shrinkage of SiC ceramics along the non-additive direction and the additive direction was 4.83% and 1.21%, respectively. This research has successfully demonstrated the direct correlation of microstructure and content of SiC with the performance parameters of SiC ceramics fabricated by SLA.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Changjiang Xiao,Haoyu Zheng,Xiang Li,Lihui Tang
In order to achieve dense SiC ceramics with better properties, SiC w /SiC ceramics without additives were prepared by high-temperature (1450 °C) and high-pressure (5.5 GPa) (HTHP) sintering using SiC whiskers (SiC w ) as a reinforcing phase. The high pressure causes the sintering temperature to be significantly reduced and the sintering time to be greatly shortened. A comprehensive analysis was conducted to elucidate the effect of SiC w content on the structure and mechanical properties of SiC ceramics. As the SiC w content increases, the properties of SiC w /SiC ceramics first improved and then decreased. At 5.0 wt% SiC w , there is the best bonding state between SiC whiskers and SiC matrix, therefore, SiC w /SiC ceramics exhibit the highest relative density of 99.08 %, maximum Vickers hardness of 23.02 GPa and fracture toughness of 9.02 MPa⋅m 1/2 . The main toughening mechanisms are assumed to be the crack deflection, bridging effect and pull-out of whisker.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）