Melt infiltration squeeze casting of SiC reinforced functionally graded metal matrix composite processing and characterization

Date

2024-1-26

Author

Tatlışen, Eralp

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Today, silicon carbide(SiC) ceramics reinforced with aluminum(Al) are used in variety of applications such as ballistics, structural applications, automotive industry and electrical systems. The aim of this study is to produce ceramic-metal composites with squeeze cast infiltration to investigate the difference in mechanical behaviors such as wear resistance, hardness and its relation with the processing of the composite and the SiC content of the composite. The hot preform squeeze casting is applied to the compacts which are made of 50 g powder containing 20 g SiC powder and 30 g Al powder, and the compact which contains 50 g SiC powder. Cold preform squeeze casting applied to the compact which contains 20 g SiC powder and 30 g Al powder. In the hot preform squeeze casting process, the ceramic preform was heated to 1000 °C and placed into the mold cavity, then the 2 wt% Mg was added in liquid Al6061 then alloy was poured on top of hot preform in the mold and then pressurized with 100 MPa to complete hot preform squeeze casting. Also, hot preform squeeze casting was performed with the ceramic-metal preform, and it was heated to 800 °C, then the infiltration occurred with 100 MPa to complete hot preform squeeze casting. In the cold preform squeeze casting process, the ceramic-metal preform was used and the infiltration was realized without the heating of the preform, then it was vacuum sintered around 600 °C for 1.5 h to obtain final consolidation similar to strain-induced melt activation and solid phase sintering. Squeeze-cast infiltrated specimens were characterized by XRD, SEM, EDS, image analysis, particle size analysis, wear test, and hardness tests. In terms of the mechanical characterization, experimental results revealed that the highest performance was obtained by the hot preform squeeze casting technique with %100 SiC porous compact. The average hardness value of the specimen was measured as 224 HBW (2.5/62.5). In addition, wear test results indicate that the specific wear rate of this specimen revealed the lowest specific wear rates which are 0.008, 0.007, and 0.006 mm3/Nm under the 10, 15, and 20 N applied loads.

Subject Keywords

Squeeze casting, Hot preform, Cold preform, Infiltration, Metal matrix composite

URI

https://hdl.handle.net/11511/108417

Collections

Graduate School of Natural and Applied Sciences, Thesis