Rheological and Mechanical Properties of Gas and Water Atomized SS 17-4PH Feedstock Used in Metal Injection Molding(MIM)
Gas and water atomized powders with different particle size distributions varying in mean particle size from finer to coarser(3 μm to 20 μm)with similar particle shape i.e.spherical in case of gas atomized & irregular in case of water atomized powders were chosen to study,correlate powder particle parameters with relevance to viscosity-shear rate,shear sensitivity,moldability during injection,deformation during sintering and mechanical properties.The study indicate that all the chosen feedstock containing gas or water atomized powder exhibits pseudoplastic behavior with viscosity reducing with respect to shear rate(shear thinning).Two optimum powder particle size distribution suitable for MIM were chosen from the rheological studies and feedstocks were molded in a complex MIM component using an injection molding machine and sintering deformation were studied.Studies indicate that the finer atomized powder has lower sintering deformation/distortion compared to the coarser atomized powder for the same volume%of solid loading and binder system.The chosen feedstocks from the gas and water atomized powder were also molded with a tensile specimen and parts were sintered in an Argon atmosphere to evaluate & compare the mechanical & metallurgical properties of SS 17-4PH material with reference to the powder parameters.
Gas atomized feedstock Water atomized feedstock Viscosity Particle size distribution Particle shape sintering deformation
Mukund B.N. Shivashankar T.S.
Indo-MIM,India
国际会议
北京
英文
628-631
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）