Carbon fiber reinforced AA5052 bulk composites were successfully fabricated by multi-pass friction stir processing (FSP), aiming to improve the wear-resistance of AA5052. The microstructural, mechanical and tribological performances of the composites were documented and investigated. Microstructure observations indicated that, in the composites, carbon fibers were homogeneously dispersed in large volume, where no obvious Al4C3 layer was detected between the matrix and the carbon fibers. The orientation of carbon fibers in the composites were random owing to the severe plastic deformation brought on by FSP. Further mechanical tests showed that the hardness of the composites increased by 46.8% comparing to the base metal, and that the composite fabricated at 1000 rpm and 75 mm/min showed 18.6% higher UTS and 13.0% higher elongation in comparison with the base metal. The wear tests illustrated that wear process of the composites was more stable and the wear volume loss was reduced by more than 70%. The strengthening of mechanical properties was attributed to formation of GNDs, crack deflection and load transfer of carbon fibers. The further analysis on the worn surfaces revealed that abrasive wear occurred in the composites, while adhesive wear occurred in both the based metal and FSPed matrix. The addition of carbon fibers segments in the aluminum could suppress the nucleation and propagation of micro-cracks, which effectively prevented the material peeling during the wear process and thus improved the tribological properties. In addition, the formation of mechanical mixing layer would be another contributing factor to the improvement of wear resistance.

Fabrication of in situ carbon fiber/aluminum composites via friction stir processing: Evaluation of microstructural, mechanical and tribological behaviors

The ZrB 2 –20 vol.% SiC (ZS) composites were diffusion bonded to Nb using pure Ti interlayer. Effects of joining temperature on the microstructure and mechanical properties of the joints were investigated. The results show that Ti reacted with Nb and ZS to form a typical three layers in the joint. An in situ synthesized TiB whiskers array which consisted of two types of TiB was produced in the reaction layer. The formation mechanism of TiB was analyzed. Mutual diffusion between Ti and Nb led to a ductile β-(Ti, Nb) layer on Nb side. Joining temperature influenced the thickness of reaction layers and distribution of TiB seriously. The maximum shear strength reached 158 MPa with bonding temperature at 1200 °C for 60 min.

Diffusion bonding of ZrB2–SiC/Nb with in situ synthesized TiB whiskers array

Characterization of microstructure and mechanical properties of Al 2 O 3 /TiAl joints vacuum-brazed with Ag-Cu-Ti + W composite filler

In situ synthesis of high strength Ag brazing filler metals during induction brazing process

Molecular dynamics simulation of linear friction welding between dissimilar Ti-based alloys

Improving the strength of brazed joints with in situ synthesized TiB whiskers

Joint properties between carbon nanotube and gold at different energy levels from molecular dynamics

The invention relates to a porous ceramic connecting method, relates to a ceramic connecting method, and aims to solve the problem that the process is complex when wettability is improved and thermal stress is relieved simultaneously when conventional porous ceramic is connected with metals. The porous ceramic connecting method comprises the following steps: I, preparing an organic phenolic resin solution; II, performing thermal treatment on porous ceramic; and III, connecting the porous ceramic. Due to a surface layer pore structure of the porous structure, a brazing filler metal can permeate into a base body to form a connecting structure with mechanical occlusion and chemical bond combination, not only is residual thermal stress of a connector effectively relieved, but also a boundary reaction combination area is increased, and the strength of the connector can be improved. The porous ceramic connecting method is applied to the field of connection of ceramic and metal materials.

Porous ceramic connecting method

The present invention discloses a reinforced porous ceramic joint connection method, belongs to ceramic and similar / dissimilar material connection field, particularly relates to a porous ceramic joint connection method, and aims to solve the porous ceramic joint connection low strength problem in the prior art. The connection method is as follows: 1, an aqueous solution of silver nitrate is prepared; 2, an impregnated dried porous ceramic is obtained by ultrasonic impregnation; 3, a porous vacuum-sintered ceramic piece is obtained by vacuum sintering; and 4, a connected porous ceramic sample piece is obtained by porous ceramic connection, and reinforced porous ceramic joint connection is achieved. The advantages are as follows: the wettability of a solder on the porous ceramic can be improved by metallization processing, the molten solder is impregnated into the porous ceramic in the connection process, interface thermo-match can be improved, the connection interface residual stress can be alleviated, and the connecting strength and reliability of a connecting member can be improved. The reinforced porous ceramic joint connection method is mainly used for porous ceramic connection.

Reinforced porous ceramic joint connection method

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