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Preparation of copper/graphite composite powders by magnetic suspension impact grinding

School of Materials Science and Engineering, Shandong University of Technology Analysis and Testing Center, Shandong University of Technology School of Chemistry and Chemical Engineering, Shandong University of Technology Abstract: Copper/graphite composite powders were prepared by a new magnetic suspension impact grinding method. The effects of grinding time and graphite addition on the particle size, graphite defects and other microstructures of the composite powders were studied. The bonding state of copper and graphite was discussed, and the efficiency of magnetic suspension impact grinding and high-energy ball milling was analyzed. The results show that when the milling time is 3 h, the particle size of composite powder with 10% graphite addition is smaller and the degree of homogeneity is higher; The copper particles in the composite powder are face centered cubic nano particles with micro strain, part of carbon atoms in graphite are dissolved in the lattice gap of copper, and the surface of the particles is wrapped by a very thin graphite layer; Compared with high-energy ball milling, magnetic suspension impact grinding has higher grinding efficiency.

2021

09-13

Effect of Graphene Size and Distribution on Crack Growth of Graphene/Aluminum Matrix Composites

Jiangsu Provincial Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University National Laboratory of Computational Fluid Dynamics, China Aerodynamic Research and Development Center Jiangsu Special Equipment Safety Supervision and Inspection Institute Abstract: Aluminum matrix composites are one of the most important materials in the mechanical industry and aerospace engineering due to their light weight and high strength. Graphene is an ideal reinforcement for metal matrix composites due to its excellent mechanical properties and high specific surface area. However, the mechanism of the effect of graphene on crack growth in aluminum matrix composites is still unclear, This restricts the design and application of graphene in aluminum matrix composites. In this paper, the molecular dynamics simulation method is used to study the effect of graphene size and distribution on crack growth in aluminum matrix composites. The research results show that when graphene size l ≤ 3.35 nm, the sub cracks generated in the tensile process promote the crack growth. It is worth noting that this promotion effect weakens as the distance between graphene and the crack increases. When the graphene size l>3.35 nm, graphene blocks the crack growth and the slip of subcrack dislocations. In addition, the distribution and angle of graphene can effectively change the crack growth path. The results of this study are helpful to understand the role of graphene in the failure of its aluminum matrix composites, It provides a reference for the design of high-performance graphene/aluminum matrix composites

2021

09-13

Development of Jixi Graphite Industry to Ensure Green Water and Green Mountains

After the first heavy snow in winter, the Northern Kingdom is wrapped in snow. In the graphite mining mines in Mashan District, Jixi City, the abandoned mines in the past are being treated one by one and vegetation is being restored; The newly planted Pinus sylvestris var. mongolica and Hippophae rhamnoides in spring and autumn this year are green and full of life in the cotton like snow. In recent years, Jixi City has adhered to the principle of increasing investment in environmental protection and paying off historical debts.

2021

09-13

Research Progress of Iron Matrix Graphite Phase Carbon Nitride Composites in Water Treatment

Iron based graphite phase carbon nitride composites combine the advantages of iron based materials, graphite phase carbon nitride (g-C3N4) and heterostructure, and have significant advantages in promoting the separation of photogenerated electrons and holes, expanding the visible light response, and improving the photocatalytic performance of the materials. The basic classification, structural characteristics and research progress of iron based graphite phase carbon nitride heterojunction systems are reviewed, including type II heterojunction systems (n-n junction, p-n junction), type Z heterojunction systems (all solid Z junction, direct Z junction) and the transfer mechanism of photogenerated carriers in typical non heterojunction systems (iron ion doping, core-shell structure). The oxidation mechanism and enhancement mechanism of iron based materials in the process of photocatalytic degradation of organic matter in different heterojunction systems are summarized.

2021

09-13

Structure and Photocatalytic Properties of Graphite Phase Carbon Nitride

The synthesis, application, modification and morphology control of graphite phase carbon nitride in the field of photocatalysis are described. The opportunities and challenges in the field of photocatalysis are prospected

2021

09-13

Preparation of copper/graphite composite powders by magnetic suspension impact grinding

School of Materials Science and Engineering, Shandong University of Technology Analysis and Testing Center, Shandong University of Technology School of Chemistry and Chemical Engineering, Shandong University of Technology Abstract: Copper/graphite composite powders were prepared by a new magnetic suspension impact grinding method. The effects of grinding time and graphite addition on the particle size, graphite defects and other microstructures of the composite powders were studied. The bonding state of copper and graphite was discussed, and the efficiency of magnetic suspension impact grinding and high-energy ball milling was analyzed. The results show that when the milling time is 3 h, the particle size of composite powder with 10% graphite addition is smaller and the degree of homogeneity is higher; The copper particles in the composite powder are face centered cubic nano particles with micro strain, part of carbon atoms in graphite are dissolved in the lattice gap of copper, and the surface of the particles is wrapped by a very thin graphite layer; Compared with high-energy ball milling, magnetic suspension impact grinding has higher grinding efficiency.

2021

09-13

Effect of Graphene Size and Distribution on Crack Growth of Graphene/Aluminum Matrix Composites

Jiangsu Provincial Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University National Laboratory of Computational Fluid Dynamics, China Aerodynamic Research and Development Center Jiangsu Special Equipment Safety Supervision and Inspection Institute Abstract: Aluminum matrix composite is one of the most important materials in mechanical industry and aerospace engineering due to its light weight and high strength Because of its excellent mechanical properties and high specific surface area, graphene is an ideal reinforcement for metal matrix composites However, the mechanism of the effect of graphene on crack growth in aluminum matrix composites is still unclear, which restricts the design and application of graphene in aluminum matrix composites In this paper, the effect of the size and distribution of graphene on the crack growth in aluminum matrix composites was studied by molecular dynamics simulation. The results showed that when the size of graphene l ≤ 3.35 nm, the sub cracks generated in the tensile process promoted the crack growth. It is worth noting that this promotion effect decreases with the increase of the distance between graphene and the crack. When the graphene size l>3.35 nm, graphene blocks the crack growth and subcrack dislocation slip. In addition, the distribution and angle of graphene can effectively change the crack growth path The results of this study are helpful to understand the role of graphene in the failure of its aluminum matrix composites, and provide some reference for the design of high-performance graphene/aluminum matrix composites

2021

09-13

Development of Jixi Graphite Industry to Ensure Green Water and Green Mountains

After the first heavy snow in winter, the Northern Kingdom is wrapped in snow. In the graphite mining mines in Mashan District, Jixi City, the abandoned mines in the past are being treated one by one and vegetation is being restored; The newly planted Pinus sylvestris var. mongolica and Hippophae rhamnoides in spring and autumn this year are green and full of life in the cotton like snow. In recent years, Jixi City has adhered to the principle of increasing investment in environmental protection and paying off historical debts.

2021

09-13

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