Investigation of the Effects of Particle Size on the Mechanical Properties of Porous and Tin Infiltrated Niobium Rods Fabricated by a Thermoplastic-Powder Metallurgy Technique

摘要

An investigation was made of the influence of particle size on the properties of both porous and tin infiltrated niobium rods fabricated by a thermoplastic-powder metallurgy technique. The residual porosity, extrusion pressure, tensile strength, and ductility were found to be dependent on the particle size distribution. All of these parameters were found to increase with increasing particle size. The influence of sintering time at a temperature of 2250 exp 0 C was also studied. With increasing sintering time, the residual porosity and tensile strength decreased, whereas the ductility increased. The procedures for fabricating infiltrated niobium rods and the various tests employed to determine their properties are described. (ERA citation 05:001352)