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Gaohui Wu - One of the best experts on this subject based on the ideXlab platform.
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Microstructure and compressive behavior of lamellar Al2O3p/Al composite prepared by freeze-drying and mechanical-pressure Infiltration Method
Science and Engineering of Composite Materials, 2020Co-Authors: Qiang Zhang, Wenshu Yang, Shanliang Dong, Shuai Ma, Yumin Zhang, Gaohui WuAbstract:AbstractInfiltrated molten Al matrix by mechanical-pressure Infiltration Method into the ceramic scaffold prepared by freeze-drying technology could prepare dense lamellar Al matrix composites without damage of the biomimetic microstructure of the scaffold. However, the investigation of lamellar Al matrix composites prepared by freeze-drying and mechanical-pressure Infiltration Method has not been fully understood yet. In the present work, the Al2O3 scaffold with pearl layer structure was prepared by freezing-dry Method, and eventually the lamellar Al2O3p/Al composite was fabricated by mechanical-pressure Infiltration Method. The Al matrix was infiltrated well into the large pores of the Al2O3 scaffold, and the lamellar structure of the Al2O3 was well preserved. The hardness of the lamellar Al2O3p/Al composite was isotropic in transvers and perpendicular directions. However, the compressive strengths of the lamellar Al2O3p/Al composite were significant anisotropic while the compressive strength in transvers direction was 127.7% higher than that in the perpendicular direction, indicating the integrality of the lamellae microstructure (especially the bridging layers). Due to the mismatched deformability, weak debonding was observed between Al and Al2O3p/Al layers in the fracture surface of the lamellar Al2O3p/Al composite. It indicates that the interfacial bonding between Al and Al2O3p/Al layers is rather strong, which is beneficial for higher strength in transvers direction but lead to lower strength in perpendicular direction.
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microstructure and tensile properties of 5083 al matrix composites reinforced with graphene oxide and graphene nanoplates prepared by pressure Infiltration Method
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Puzhen Shao, Wenshu Yang, Jing Qiao, Qiang Zhang, Zhenhe Yu, Qingyu Meng, Gaohui WuAbstract:Abstract In the present work, 5083Al matrix composites reinforced with graphene oxide (GO) and graphene nanoplates (GNPs) have been prepared by the pressure Infiltration Method. Regardless of the graphene types, no peaks of Al 4 C 3 phase have been detected by the XRD analysis. However, needle-like Al 4 C 3 phase has been observed in the GO/5083Al and the GNPs/5083Al composites, while the content of the Al 4 C 3 phase in the GNPs/5083Al composite was much lower. Furthermore, the segregation of Mg element at the surface of the GNPs has been found in the GNPs/5083Al composite, implying the inhibition effect of Mg element on the formation of the Al 4 C 3 phase. It has been found that the yield strength of the composites was slightly improved by the addition of the GO and GNPs, and the GNPs/5083Al composite demonstrated 14% increment in the tensile strength. Meanwhile, the pulling-out of the GO and GNPs have been observed.
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microstructure and mechanical properties of graphene nanoplates reinforced pure al matrix composites prepared by pressure Infiltration Method
Journal of Alloys and Compounds, 2018Co-Authors: Wenshu Yang, Jing Qiao, Qiang Zhang, Qiqi Zhao, Puzhen Shao, Zhenhe Yu, Gaohui WuAbstract:Abstract In the present work, microstructure and mechanical behavior of the graphene nanoplates (GNPs) reinforced pure Al (GNPs/Al) composites prepared by the pressure Infiltration Method was investigated. No Al4C3 phase was detected in the composites, while GNPs have been well bonded with the Al matrix. It is suggested that the reaction between pure Al matrix and graphene could also be inhibited by using graphene with fewer defects. It has been found that the mechanical properties of the composites could be significantly improved by the addition of graphene. After addition of 0.54 wt% GNPs, the improvement of the yield and tensile strength before the extrusion was 116% and 45%, respectively. However, after the extrusion treatment, the corresponding increment of the yield and tensile strength was increased to 228% and 93%, respectively. Moreover, the fracture surface of the GNPs/Al composites before and after the extrusion treatment was mainly characterized by the lamellar structure with bridging of GNPs and the fine equiaxed structure with the pulling-out of the GNPs, respectively. Based on the modified shear-lag model, the strengthening mechanism of the GNPs/Al composites has been discussed, and the effect of GNPs and the extrusion treatment on the yield strength of the composites have been analyzed.
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graphene nanoflakes reinforced al 20si matrix composites prepared by pressure Infiltration Method
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Wenshu Yang, Guoqin Chen, Jing Qiao, Rui Xiao, Ronghua Dong, Murid Hussain, Gaohui WuAbstract:Abstract It has not been reported in the existed literatures that whether it is possible to prepare GNFs/Al composites by pressure Infiltration Method due to the poor wettability and severe reaction behavior between carbon and molten Al. In the present study, microstructure and mechanical behavior of graphene nanoflakes (GNFs) reinforced Al-20Si (GNFs/Al-20Si) composites prepared by the pressure Infiltration Method have been thoroughly investigated. The Al-20Si matrix was chosen to inhibit the formation of Al 4 C 3 . It has found that the GNFs and Al alloy matrix has been well bonded without formation of Al 4 C 3 , which authenticated the effectiveness of the alloying treatment. Moreover, the hardness and the elastic modulus of the composites were increased linearly with the increase in the GNFs content. After addition of 1.5 wt% GNFs, the ultimate tensile strength and bending strength attained the peak values, which increased 130% and 230% to that of Al matrix, respectively. To the best of our knowledge, it is the highest strengthening ratio in Al matrix composites reinforced with graphene reinforcements. Furthermore, based on the modified shear-lag model and combined with the literatures’ data, the strengthening behavior of GNFs/Al composites has been extensively discussed. It is concluded that the pressure Infiltration Method is the most feasible and successful way to prepare GNFs/Al composites without formation of Al 4 C 3 and with high strengthening ratio.
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microstructure and tensile properties of si3n4p 2024al composite fabricated by pressure Infiltration Method
Materials & Design, 2012Co-Authors: Wenshu Yang, Guoqing Chen, Longtao Jiang, Gaohui WuAbstract:Abstract 2024Al matrix composite reinforced with 45 vol.% Si 3 N 4 particles (Si 3 N 4p /2024 composite) with average particle size of 1.5 μm was fabricated by pressure Infiltration Method. The tensile behaviour and microstructure of Si 3 N 4p /2024 composite were investigated. β-Si 3 N 4 was the main reinforcement, while α-Si 3 N 4 and few large Si particles were also observed in composite. Few aligned linear dislocations were observed in Si 3 N 4 particles due to internal and thermal stresses. MgAl 2 O 4 was observed at Si 3 N 4 –Al interface. Fracture of Si 3 N 4p /2024Al composite was characterized by brittle fracture, indicating strong Si 3 N 4 –Al interfacial bonding. Dislocation density in Si 3 N 4 particles and Al matrix increased after tensile testing.
Tong Zhang - One of the best experts on this subject based on the ideXlab platform.
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solvent free Infiltration Method to prepare mesoporous sno2 templated by sio2 nanoparticles for ethanol sensing
Sensors and Actuators B-chemical, 2015Co-Authors: Yong Zhang, Bo Yu, Ziying Wang, Hongran Zhao, Nan Zhou, Tong ZhangAbstract:Abstract Mesoporous SnO 2 has been successfully prepared by the solvent-free Infiltration Method using SiO 2 nanoparticles as template. The combined characterizations of X-ray diffraction pattern, nitrogen sorption isothermal, and transmission electron microscopy indicate the successful preparation of mesoporous SnO 2 . It is found that the mesoporous SnO 2 exhibits high response, good selectivity, fast response and recovery rate for detection of ethanol, which are much better than that of bulky SnO 2 prepared in the absence of SiO 2 nanoparticles.
Wenshu Yang - One of the best experts on this subject based on the ideXlab platform.
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Microstructure and compressive behavior of lamellar Al2O3p/Al composite prepared by freeze-drying and mechanical-pressure Infiltration Method
Science and Engineering of Composite Materials, 2020Co-Authors: Qiang Zhang, Wenshu Yang, Shanliang Dong, Shuai Ma, Yumin Zhang, Gaohui WuAbstract:AbstractInfiltrated molten Al matrix by mechanical-pressure Infiltration Method into the ceramic scaffold prepared by freeze-drying technology could prepare dense lamellar Al matrix composites without damage of the biomimetic microstructure of the scaffold. However, the investigation of lamellar Al matrix composites prepared by freeze-drying and mechanical-pressure Infiltration Method has not been fully understood yet. In the present work, the Al2O3 scaffold with pearl layer structure was prepared by freezing-dry Method, and eventually the lamellar Al2O3p/Al composite was fabricated by mechanical-pressure Infiltration Method. The Al matrix was infiltrated well into the large pores of the Al2O3 scaffold, and the lamellar structure of the Al2O3 was well preserved. The hardness of the lamellar Al2O3p/Al composite was isotropic in transvers and perpendicular directions. However, the compressive strengths of the lamellar Al2O3p/Al composite were significant anisotropic while the compressive strength in transvers direction was 127.7% higher than that in the perpendicular direction, indicating the integrality of the lamellae microstructure (especially the bridging layers). Due to the mismatched deformability, weak debonding was observed between Al and Al2O3p/Al layers in the fracture surface of the lamellar Al2O3p/Al composite. It indicates that the interfacial bonding between Al and Al2O3p/Al layers is rather strong, which is beneficial for higher strength in transvers direction but lead to lower strength in perpendicular direction.
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microstructure and tensile properties of 5083 al matrix composites reinforced with graphene oxide and graphene nanoplates prepared by pressure Infiltration Method
Composites Part A-applied Science and Manufacturing, 2018Co-Authors: Puzhen Shao, Wenshu Yang, Jing Qiao, Qiang Zhang, Zhenhe Yu, Qingyu Meng, Gaohui WuAbstract:Abstract In the present work, 5083Al matrix composites reinforced with graphene oxide (GO) and graphene nanoplates (GNPs) have been prepared by the pressure Infiltration Method. Regardless of the graphene types, no peaks of Al 4 C 3 phase have been detected by the XRD analysis. However, needle-like Al 4 C 3 phase has been observed in the GO/5083Al and the GNPs/5083Al composites, while the content of the Al 4 C 3 phase in the GNPs/5083Al composite was much lower. Furthermore, the segregation of Mg element at the surface of the GNPs has been found in the GNPs/5083Al composite, implying the inhibition effect of Mg element on the formation of the Al 4 C 3 phase. It has been found that the yield strength of the composites was slightly improved by the addition of the GO and GNPs, and the GNPs/5083Al composite demonstrated 14% increment in the tensile strength. Meanwhile, the pulling-out of the GO and GNPs have been observed.
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microstructure and mechanical properties of graphene nanoplates reinforced pure al matrix composites prepared by pressure Infiltration Method
Journal of Alloys and Compounds, 2018Co-Authors: Wenshu Yang, Jing Qiao, Qiang Zhang, Qiqi Zhao, Puzhen Shao, Zhenhe Yu, Gaohui WuAbstract:Abstract In the present work, microstructure and mechanical behavior of the graphene nanoplates (GNPs) reinforced pure Al (GNPs/Al) composites prepared by the pressure Infiltration Method was investigated. No Al4C3 phase was detected in the composites, while GNPs have been well bonded with the Al matrix. It is suggested that the reaction between pure Al matrix and graphene could also be inhibited by using graphene with fewer defects. It has been found that the mechanical properties of the composites could be significantly improved by the addition of graphene. After addition of 0.54 wt% GNPs, the improvement of the yield and tensile strength before the extrusion was 116% and 45%, respectively. However, after the extrusion treatment, the corresponding increment of the yield and tensile strength was increased to 228% and 93%, respectively. Moreover, the fracture surface of the GNPs/Al composites before and after the extrusion treatment was mainly characterized by the lamellar structure with bridging of GNPs and the fine equiaxed structure with the pulling-out of the GNPs, respectively. Based on the modified shear-lag model, the strengthening mechanism of the GNPs/Al composites has been discussed, and the effect of GNPs and the extrusion treatment on the yield strength of the composites have been analyzed.
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graphene nanoflakes reinforced al 20si matrix composites prepared by pressure Infiltration Method
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Wenshu Yang, Guoqin Chen, Jing Qiao, Rui Xiao, Ronghua Dong, Murid Hussain, Gaohui WuAbstract:Abstract It has not been reported in the existed literatures that whether it is possible to prepare GNFs/Al composites by pressure Infiltration Method due to the poor wettability and severe reaction behavior between carbon and molten Al. In the present study, microstructure and mechanical behavior of graphene nanoflakes (GNFs) reinforced Al-20Si (GNFs/Al-20Si) composites prepared by the pressure Infiltration Method have been thoroughly investigated. The Al-20Si matrix was chosen to inhibit the formation of Al 4 C 3 . It has found that the GNFs and Al alloy matrix has been well bonded without formation of Al 4 C 3 , which authenticated the effectiveness of the alloying treatment. Moreover, the hardness and the elastic modulus of the composites were increased linearly with the increase in the GNFs content. After addition of 1.5 wt% GNFs, the ultimate tensile strength and bending strength attained the peak values, which increased 130% and 230% to that of Al matrix, respectively. To the best of our knowledge, it is the highest strengthening ratio in Al matrix composites reinforced with graphene reinforcements. Furthermore, based on the modified shear-lag model and combined with the literatures’ data, the strengthening behavior of GNFs/Al composites has been extensively discussed. It is concluded that the pressure Infiltration Method is the most feasible and successful way to prepare GNFs/Al composites without formation of Al 4 C 3 and with high strengthening ratio.
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microstructure and tensile properties of si3n4p 2024al composite fabricated by pressure Infiltration Method
Materials & Design, 2012Co-Authors: Wenshu Yang, Guoqing Chen, Longtao Jiang, Gaohui WuAbstract:Abstract 2024Al matrix composite reinforced with 45 vol.% Si 3 N 4 particles (Si 3 N 4p /2024 composite) with average particle size of 1.5 μm was fabricated by pressure Infiltration Method. The tensile behaviour and microstructure of Si 3 N 4p /2024 composite were investigated. β-Si 3 N 4 was the main reinforcement, while α-Si 3 N 4 and few large Si particles were also observed in composite. Few aligned linear dislocations were observed in Si 3 N 4 particles due to internal and thermal stresses. MgAl 2 O 4 was observed at Si 3 N 4 –Al interface. Fracture of Si 3 N 4p /2024Al composite was characterized by brittle fracture, indicating strong Si 3 N 4 –Al interfacial bonding. Dislocation density in Si 3 N 4 particles and Al matrix increased after tensile testing.
Makoto Yoshida - One of the best experts on this subject based on the ideXlab platform.
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Development in manufacturing of carbon fiber reinforced aluminum preform wires using ultrasonic Infiltration Method
Journal of Japan Institute of Light Metals, 2015Co-Authors: Tadashi Matsunaga, Kenji Matsuda, Tomei Hatayama, Kenji Shinozaki, Shigekazu Amanuma, Makoto YoshidaAbstract:In this study, we have developed a novel manufacturing process of “preform wires” which are semi-finished materials used for the fabrication of CF/Al composites. The preform wires were continuously fabricated using an ultrasonic Infiltration Method. The manufacturing apparatus fundamentally consisted of preheating furnace, ultrasonic horn and transducer and taking up reel for winding. Influence of each processing parameter on the Infiltration ratio was investigated. As the optimum condition, after carbon fiber was heated at 973 K for desizing, the ultrasonic was applied at 200 W to molten Al-Mg alloy for the Infiltration of the molten alloy into the bundle. The addition of magnesium into molten aluminum improved the infiltratability. CF/Al-4.7%Mg preform wires with a tensile strength of 1100 MPa was obtained at the fabricating speed of 0.22 m/s. It is clear that the ultrasonic Infiltration Method is effective to fabricate CF/Al preform wires.
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Influence of interfacial chemical reaction for tensile strength of carbon fiber reinforced aluminum-magnesium alloy composites fabricated by ultrasonic Infiltration Method
Journal of Japan Institute of Light Metals, 2015Co-Authors: Jun Mikuni, Tadashi Matsunaga, Kenji Shinozaki, Kazuyuki Nonokawa, Makoto YoshidaAbstract:Carbon fiber reinforced aluminum alloy composites (CF/Al composites) are expected in aerospace and electric power cable industries due to superior specific strength and specific modulus. But, it is known that CF/Al composites form aluminum carbide (Al4C3) at the interface between carbon fiber and aluminum alloy when CF/Al composites are fabricated. However, effects of type of carbon fiber (PAN, pitch) on growth mechanism of Al4C3 and tensile strength of CF/Al composites have not been clarified. In this study, at first, CF/Al composites are fabricated with ultrasonic Infiltration Method. Secondary, effects of type of carbon fiber and fabricating time on quantity and size of Al4C3 were investigated. Thirdly, effects of quantity and size of Al4C3 on tensile strength of CF/Al composites were examined. The length of Al4C3 increased with increase in fabricating time for PAN-based composites. It was suggested that the numbers of nucleating sites of Al4C3 increased with an increase in fabricating time for pitch-based composites. As the result, as to the PAN-based composites, it should be controlled less than 100 nm of the length of Al4C3 to inhibit degradation of tensile strength. As to the pitch-based composites, fabricating time should be shorter.
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fabrication of continuous carbon fiber reinforced aluminum magnesium alloy composite wires using ultrasonic Infiltration Method
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Tadashi Matsunaga, Kenji Matsuda, Tomei Hatayama, Kenji Shinozaki, Makoto YoshidaAbstract:Abstract In order to fabricate continuous carbon fiber-reinforced aluminum alloy matrix composites, various Infiltration Methods such as gas pressure Infiltration, CVD-Infiltration, and ultrasonic Infiltration Methods have been developed. Among these Methods, the ultrasonic Infiltration Method is the simplest. In this study, the effects of ultrasonic power, the diameter of the hole of the horn, fabricating speed, and magnesium content on the ease of Infiltration are investigated. As the results, both an ultrasonic power of 200 W and the addition of more than 2.4 mass% Mg are indispensable to infiltrate molten aluminum alloy into a PAN-based M40J carbon fiber bundle, which has 6000 filaments. Contrariwise, the tensile strength and relative strength (ROM ratio) of the obtained composites decreased from 1100 MPa (0.7) at both 2.4 and 4.7 mass% Mg contents to 800 MPa (0.5) at 10 mass% Mg content. This was probably caused by an increase in the content of the Al 3 Mg 2 intermetallic compound. Consequently, the addition of magnesium is effective in improving the Infiltration; however, it causes the strength of the composites to decrease. It is found that in this process, the optimum magnesium content in aluminum from the viewpoints of ease of Infiltration and strength was 4.7 mass%.
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Infiltration mechanism of molten aluminum alloys into bundle of carbon fibers using ultrasonic Infiltration Method
Journal of Japan Institute of Light Metals, 2006Co-Authors: Tadashi Matsunaga, Tomei Hatayama, Kenji Shinozaki, Kenji Ogata, Makoto YoshidaAbstract:As the fabricating process of continuous M40J carbon fiber reinforced aluminum alloys composite wires by using ultrasonic Infiltration Method, the mechanism of the Infiltration of molten alloys into the bundle of the carbon fibers was examined especially from the viewpoints of wettability, acoustic cavitation and threshold pressure for Infiltration. It was found that the infiltratability of the alloys was proportional to the maximum intensity of the acoustic cavitation. Both the infiltratability and the intensity were enhanced by the addition of surfactant elements for molten aluminum. Thus, decrease in surface tension will cause the generation of acoustic cavitation to increase. When the ultrasonic vibration is applied to molten aluminum alloys, acoustic cavitation would be formed on/in the bundle of carbon fibers. Then the shock wave, which was caused by the cavitation collapsed, would lead to leave the distance between fibers in the bundle. From the results of the direct observation of the bundle in the aqueous solution using high speed camera during applied ultrasonic vibration, the diameter of the bundle was increased by generating the cavitation. Thus, this phenomenon will also cause the decrease in the threshold pressure for Infiltration. Therefore, both the generation of the acoustic cavitation and increase in the interval between fibers will be the controlling factors of the Infiltration in the fabricating process of this kind of composites by using ultrasonic vibration.
Seung C Park - One of the best experts on this subject based on the ideXlab platform.
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solvent free Infiltration Method for mesoporous sno2 using mesoporous silica templates
Microporous and Mesoporous Materials, 2009Co-Authors: Jeong Kuk Shon, Soo Sung Kong, Won Kyu Park, Seung C ParkAbstract:Abstract Mesoporous tin oxide (SnO 2 ) materials, exhibiting high surface areas, crystalline frameworks and various mesostructures, were successfully obtained by a facile solvent-free Infiltration Method from mesoporous silica templates. Various kinds of mesoporous silica materials, such as KIT-6 (bicontinuous 3-D cubic, Ia 3 d ), SBA-15 (2-D hexagonal, p 6 mm ), SBA-16 (3-D cubic with cage-like pores, Im 3 m ) and spherical mesoporous silica (disordered), were utilized as the hard templates. Tin precursor (SnCl 2 · 2H 2 O, m.p. 310–311 K) was infiltrated spontaneously within the mesopores of silica templates by melting the precursor at 353 K without using any solvent. The heat-treatment of SnCl 2 -infiltrated composite materials at 973 K under static air conditions and subsequent removal of silica templates by using HF result in the successful preparation of mesoporous SnO 2 materials. The mesostructures as well as the morphologies of mesoporous SnO 2 materials thus obtained were very similar with those of the mesoporous silica templates. The mesoporous SnO 2 materials exhibit high surface areas of 84–121 m 2 /g as well as high pore volumes in the range of 0.22–0.35 cm 3 /g. The present solvent-free Infiltration Method is believed to be a simple and facile way for the preparation of mesoporous materials via nano-replication from mesoporous silica templates.