Sintering behavior and properties of Mo-Cu composites produced by spark plasma sintering
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The Mo-Cu composites containing 10-40 wt.% Cu were fabricated by subjecting Mo and Cu powders to high energy ballmilling for 15 hrs at 200 rpm, followed by spark plasma sintering at 950 °C under 60 MPa. The synthesized powders weresintered using SPS, resulting in a gradual increase in relative density from 82.8% for Mo-10Cu to 90.1% for Mo-40Cuwith increasing Cu content. X-ray diffraction confirmed that only Mo and Cu phases were present in all sintered samples. Microstructural analysis revealed a transition from isolated Cu regions in a Mo matrix at low Cu content to a continuous Cumatrix with dispersed Mo particles at high Cu content. The thermal conductivity of the composites increased from 122.8 to158.8 W/m·K as the Cu content increased, while the Vickers hardness decreased from 591.2 to 395.2 Hv due to the increasein the volume fraction of Cu, which has a lower hardness compared to Mo.
Abstract
The Mo-Cu composites containing 10-40 wt.% Cu were fabricated by subjecting Mo and Cu powders to high energy ballmilling for 15 hrs at 200 rpm, followed by spark plasma sintering at 950 °C under 60 MPa. The synthesized powders weresintered using SPS, resulting in a gradual increase in relative density from 82.8% for Mo-10Cu to 90.1% for Mo-40Cuwith increasing Cu content. X-ray diffraction confirmed that only Mo and Cu phases were present in all sintered samples. Microstructural analysis revealed a transition from isolated Cu regions in a Mo matrix at low Cu content to a continuous Cumatrix with dispersed Mo particles at high Cu content. The thermal conductivity of the composites increased from 122.8 to158.8 W/m·K as the Cu content increased, while the Vickers hardness decreased from 591.2 to 395.2 Hv due to the increasein the volume fraction of Cu, which has a lower hardness compared to Mo.