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
CORROSION SCIENCE
·
2024
·
IF 7.4
Fuping Li,Wei Zheng,Feng Qin,Xu Hu,Wei Dang,Zhuoli Xu,Xinyuan Zhang,Kang Zhao,Yufei Tang
Polycarbosilane-derived ceramic coatings with superior oxidation resistance enhanced by SiC whisker fillers were prepared on titanium alloys via a dip coating method. The mass gain for coatings with whiskers is −0.22 and 1.725 mg/cm 2 after oxidation at 600 °C and 700 °C for 200 h, respectively, which is lower than the values for coatings without SiC whiskers and in other works. SiC whiskers not only compensate the shrinkage of PCS like particle-shaped fillers, but also inhibit the formation of cracks. In addition, SiC whiskers increase the viscosity of the glass phase and decrease its volatilization, thus improving the oxidation resistance.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Feng Mao,Xiaoxin Zhang,Qingzhi Yan
The application scope of advanced ceramics is significantly limited due to their inherent brittleness, making the enhancement of fracture toughness a critical area of research. Although the incorporation of SiC whiskers (SiCw) has been shown to effectively improve fracture toughness, a high content of whiskers complicates the densification process. Herein, we discovered that the addition of SiCw can react in-situ with sintering additives, enabling SiC ceramics to achieve densification while incorporating a substantial quantity of whiskers. We systematically investigated the effects of stacking faults in SiC whiskers on the densification and microstructure of ceramics. SiCw with stacking faults reacted with sintering additives, leading to improved densification and refined grains. In contrast, whiskers without stacking faults maintained a rod-like structure within the ceramic matrix, resulting in whisker debonding and pull-out. When 40 vol.% SiCw was added, the optimized flexural strength and fracture toughness can reach 885 MPa and 8.94 MPa·m 0.5 , respectively.
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
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 11
·1-14
·
IF 3.061
Zhang Zhao Xin,Yang Shang Ke,Shen Jun Wei,Yang Jia,Bian Jun,Zhang Ai Ping,Lin Hai Lan,Chen Dai Qiang
In order to systematically investigate the dependence of the properties of nanocomposites on the shape of nanofillers, including spherical and fibrous, and the contents and its special arrangement, polyimide (PI) as matrix, nano-silicon carbide particles (SiC p ) and whisker (SiC w ) as fillers were applied to prepare PI nanocomposite films by in-situ polymerization. FTIR and XRD tests verified the successful polymerization of SiC/PI nanocomposites. FESEM observations showed that both SiC p and SiC w nanofillers were uniformly dispersed in the PI matrix during in-situ polymerization and contributed to the improvements of properties. Compared with pure PI film, addition of SiC nanofillers enhanced obviously the heat resistance and the thermal stabilities of PI nanocomposites, as verified by TGA. Tensile tests indicated that the mechanical properties of PI nanocomposites enhanced with increasing SiC nanofillers. Moreover, SiC w was more prominent than SiC p in the reinforcement of PI nanocomposites. Due to the influences of dielectric properties by the changes of the spatial arrangement and the local distribution of electric field of the nanofillers in PI matrix, the dielectric constant of 3wt.%SiC p /PI and 3wt.%SiC w /PI nanocomposites reached 4.3 and 5.6, respectively. Compared with pure PI film, the dielectric constants of SiC p /PI and SiC w /PI nanocomposites were enhanced by 26% and 64%, respectively. In comparison, PI nanocomposites containing SiC w possessed higher effective permittivity than those containing SiC p under the same nanofillers concentration. This work is expected to show great significance to understand the microscopic mechanism of PI dielectric nanocomposites for high energy-storage applications.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Yuan Fang,Aoxuan Wang,Keze He,Hongying Pan,Jiajun Liao,Zhu Ding,Feng Xing,Huirong Le,Xianfeng Wang
This article investigates the key interface properties of geopolymers reinforced by SiC whiskers loaded with BN coating (BN/SiCw) and the insight of mechanical performance and microstructures of the resulting composites. The interesting diverse strength evolutions of geopolymer composites calcinated at various temperatures suggest a result of rivalries of multiple factors including BN coating, geopolymer matrix transformations, SiC whiskers. A positive effect on whisker pull-out phenomenon has been achieved via the chemical bonding between SiC whisker (SiCw) and BN coating and the rough physical interface between BN coating and geopolymers; the addition of SiCw and BN/SiCw promotes the polycondensation reaction of geopolymers and the addition of the latter is superior. Through changing the pore structure characteristics of the composites, the SiCw in composites can release their excessive vapor pressure in the closed pores which is the main reason attributing to the strength loss of geopolymers at 900 °C. In addition, BN coating can make up for the mismatch of thermal expansion coefficient between SiCw and geopolymers, increasing the strength of the composites by 30.9% at 900 °C, whereas whisker pull-out and crack deflection are the main toughening effect for BN/SiCw.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Huiwen Xiong,Lianzhong Zhao,Hehao Chen,Xiaofeng Wang,Kechao Zhou,Dou Zhang
3D SiC-based lattices with aligned SiC whiskers were prepared via direct ink writing of SiC w /polycarbosilane (PCS)-based suspensions. Suspensions with different solid loading were prepared and used to investigate the morphology and printability of 3D SiC w /SiC lattices. Filaments with the morphologies of accumulation, coiling, meandering and straight were achieved with different printing height and speed. Higher printing height favored the formation of coiled filaments with longer periodic structure and increased amplitude. 3D lattices with straight filaments and good retention of shape were achieved only when applying a suitable printing parameters for SiC w /PCS-based suspensions with a solid loading of 62.3 vol%. The resulted 3D lattices with the porosity around 62% showed impressive bending and compression strength of 33.2 ± 5.2 MPa and 30.6 ± 4.3 MPa, respectively. The satisfactory properties of 3D SiC w /SiC lattices were contributed by the pullout of the aligned SiC whiskers. Furthermore, this 3D technique via the Polymer-derived Ceramics (PDCs) route allows the fabrication of large sized samples, which opens new opportunities for the fabrication of 3D structures with unique mechanical and functional properties in practical dimensions.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Yang Chen,Zhi Wu,Xiaoming Lou,Jun Ding,Chengji Deng,Chao Yu,Hongxi Zhu,Tao Zhang
In view of the current situation that morphology of SiC whiskers synthesized from rice husk is too single, in this work, the chain-bead SiC whiskers were successfully synthesized via a simple molten-salt method. The effects of heating temperature on the phase composition and morphology of the product were compared under the salt-free and molten-salt conditions. The results indicated that the liquid environment formed by molten salt could retain SiO 2 in the product and promote the formation of cristobalite, inhibiting the formation of SiC. Compared with the SiC synthesized under salt-free condition (linear morphology), the SiC whiskers synthesized by the molten-salt method at 1400 °C showed a chain-bead morphology, which was composed of β-SiC stalks and round beads of amorphous SiO 2 on the stalks. Finally, the formation mechanism of chain-bead SiC whiskers in the molten-salt environment was clarified.
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
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qianlong Fu,Yuting Ma,Juan Wang,Yongzhao Yang,Peng Wang,Shuang Li,Yang Zhao
High-purity SiC ceramic membrane has gained tremendous attention in the treatment of various corrosive wastewaters. Additive manufacturing technique makes it possible to fabricate high-purity SiC ceramic membrane with complex configurations. Here, we proposed a route for the preparation of high-purity SiC ceramic membrane support using digital light processing and SiC whisker reinforcement. With the increase of whisker content, the viscosity of SiC w /SiC photosensitive slurry increased due to the formation of whiskers agglomerations; the average pore size shifted from 3.15 μm to 1.35 μm with the occupation of large pores by SiC whiskers. In addition, the compressive strength of the ceramic support increased from 10.7 MPa to 16.7 MPa because of the decline in pore size and the toughening effects by SiC whiskers. So, the introduced SiC whiskers enhanced the pore connectivity and mechanical strength of the porous ceramics. This work provides a feasible path to manufacture high-purity SiC ceramic membrane support with complex configuration, high pore-connectivity and excellent mechanical properties.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Saisai Li,Yi Ding,Jiaxuan Xin,Gang Qi,Minghui Li,Ruoyu Chen,Haijun Zhang
In this study, the microporous structure of carbon refractory bricks was enhanced through the incorporation of innovative graphitic-silica microspheres with high chemical reactivity. These microspheres were synthesized via hydrothermal carbonization and catalytic graphitization, using silica sol and sucrose wastewater as raw materials. The elemental distribution and morphology of the products obtained through hydrothermal carbonization and catalytic graphitization were analyzed. Building on these findings, the effects of varying graphitic-silica microsphere contents on the phase composition, microstructure, physical properties, molten iron corrosion resistance, and high-temperature carbon dioxide corrosion resistance of the samples were investigated. Compared to samples without graphitic-silica microspheres, those containing the microspheres exhibited in-situ formation of SiC whiskers within the pores, creating a network structure that effectively subdivided the macropores and increased microporosity. Furthermore, these samples demonstrated significant improvements in density, compressive strength, thermal conductivity, and resistance to both molten iron corrosion and high-temperature carbon dioxide corrosion. As the microsphere content increased from 2 wt% to 8 wt%, the sample properties initially improved and then declined. At the optimal microsphere content of 4 wt%, the samples achieved a porosity of 7.5 %, a density of 1.78 g/cm³ , a compressive strength of 69.4 MPa, a thermal conductivity of 11.53 W/m·K, and excellent resistance to molten iron and carbon dioxide corrosion. This study offers an effective approach to improving the performance of carbon refractory bricks.
研究领域:
材料科学
·
耐火材料工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Mu,Liwen Yan,Peisen Liu,Qichao Gao,Anran Guo,Xiaojing Xu,Haiyan Du,Shun Dong,Jiachen Liu
As a critical structure of thermal protection systems, flexible fibre insulation felts are widely used on the leeward surface of spacecrafts. To enhance the thermal resistance of flexible fibre felts, SiC w -ZrO 2 coatings with different SiC whisker (SiC w ) contents were fabricated on the surface of a high-silica-fibre fabric (HSFF) by employing a sol-gel method combined with a spraying route. The introduction of SiC w having a length of 10–50 μm effectively improved the coating integrity. After calcination at 1000 °C for 1 h, the SiC w -ZrO 2 coating containing 8 wt% SiC w did not damage the tensile strength and flexibility of the fibre fabric, and the interfacial bonding strength between the coating and HSFF reached 0.40 MPa, benefitting from the whisker toughening mechanism. The SiC w -ZrO 2 coating with a high emissivity of 0.96 in the 2–14 μm wavelength range reduced the surface temperature of the flexible insulation felt by approximately 300 °C when a butane torch was applied at above 1300 °C.
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
·
2024
·
IF 5.1
Lei Yu,Kuibao Zhang,Daimeng Chen,Baozhu Luo
TiB 2 -B 4 C composites modified by SiC W with excellent mechanical properties were prepared using hot-press sintering. The effects of SiC W content on the microstructure, densification behavior and mechanical properties were investigated. The dynamic failure behavior was analyzed through the Hopkinson Bar (SHPB) testing. The results demonstrate that the addition of SiC W can effectively refine the microstructure and simultaneously improve the mechanical properties. The TiB 2 -B 4 C composite renforced with 6 wt% SiC W exhibits a nearly full-dense microstructure and excellent mechanical properties. The relative density, flexural strength , Vickers hardness and fracture toughness can reach to 99.95 %, 724 ± 61 MPa, 19.8 ± 0.7 GPa and 6.7 ± 0.3 MPa m 1/2 , respectively. The dynamic failure behavior exhibits that the damage degree increases with elevated loading speed. Moreover, the single-peak and double-peak of the waveform correspond to the two damage degrees of "broken" and "crushed".
研究领域:
材料科学
·
力学
✓ 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）