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Title:: Experimental Investigation on Metal-Diamond Composite Nozzles Fabricated via FDMS Process

Author(s):: WU Dongyu; LIU Yujie; ZHANG Shaohe; KONG Xiangwang; HE Tao; ZHANG Qian; 1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South Unversity, Changsha 410083, China 2.School of Geosciences and InfoPhysics, Central South University, Changsha 410083, China

Keywords:: fused deposition modeling and sintering; metal-diamond composite; nozzles; evaporation pathway; debinding efficiency; uniform dispersion

Abstract:: The powder metallurgy method for preparing nozzles with complex runner structures involves high manufacturing costs, processing difficulties and other issues. This paper proposes a nozzle modeling and manufacturing method based on fused deposition modeling and sintering (FDMS) technology, and analyzes the impact of the fused depositon printing parameters and debinding process parameters on nozzle quality. The conclusions can be drawn as follows: during the thermal debinding process, the evaporation pathways of the binder inside green parts significantly influence the debinding efficiency,appropriately increasing the evaporation paths of the binder and choosing the ceramic composites as the main material for the modeling of flow channel, thereby ensuring the integrity of internal channels after postsintering. when the brown parts can retain a good morphology, the sintered nozzles retain a good end face and flow channel morphology,however,compared to flow channel size of the green parts, the sintered flow channel size shrinks by about 14% in the radial direction. The microstructure analysis indicates that, there is no fracture defect inside the specimen, and the diamond particles are uniformly distributed in the matrix, the quality of the nozzle has preliminarily reached the expected results.