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Microstructure, hardness, and porosity of porous composite brass prepared by the powder metallurgy route
 
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University of Babylon
 
 
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Ruaa Hatem Kadhim   

University of Babylon
 
 
 
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ABSTRACT
This work aims to prepare a porous brass composite material reinforced with boron carbide and to select the optimal conditions to achieve the highest porosity with the highest possible hardness. Samples were prepared using the powder metallurgy technique. Brass (70% Cu, 30% Zn) was reinforced with 3, 6, and 9 wt.% of boron carbide. To create the pores, spherical urea granules (diameter approximately 425 µm) were used as a space holder at a weight percentage of 30%. The purity of urea was 99.5%. After the compaction process, the urea was removed using hot water at 100 degrees Celsius. The powders were compacted at three different pressures: 600, 700, and 800 MPa. The specimens were sintered at temperatures of 650, 700, and 750°C for 120 min under a vacuum atmosphere of 10⁻⁴ torr. Taguchi method (L9) in Minitab 18 was used to design the experimental part. The results showed apparent porosity of 22% to 34% and microhardness of 238 HV to 302 HV. The microstructure exhibited a comparatively homogeneous dispersion of B₄C particles in the brass matrix while maintaining the porous structure resulting from urea removal. The results also indicated that increasing the compacting pressure and sintering temperature, as well as the weight percentage of B₄C, led to improved densification, reduced porosity, and increased hardness. These results suggest that controlling manufacturing parameters is essential for enhancing the properties of porous brass composites and producing materials with improved mechanical performance. The results of the experiments were analyzed using analysis of variance, and the Response surface methodology and the desirability function analysis were used to determine the optimal conditions. The optimization results showed a good value for composite desirability, indicating good agreement between the studied responses
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