Microstructure, mechanical properties and sintering model of B4C nozzle with micro holes by powder injection molding

► B4C nozzles with micro holes were manufactured by powder injection molding. ► SiC-ZrO2 multivariate additive system was used to improve the densification. ► Equiaxed ZrB2 and SiC phases change to plate-like with increasing temperature. ► Fracture strength and hardness of sintered samples reach to 305.9 MPa and 3201 HV. ► A sintering model between linear shrinkage and relative density was established.