Iron Base Infiltration

Iron Base Infiltration Technical Publications

180. Dimensional Change Characteristics and Surface Quality of Fully Dense Iron Base Infiltrated Parts The present study examines the factors effecting the dimensional change characteristics and surface quality of iron base infiltrated parts. The dimensional change characteristics include part uniformity as well as part to part consistency. The surface quality relates to the disposition and effects of infiltrant residues on the structural integrity and appearance of the infiltrated surfaces.

It is shown that part uniformity and part to part consistency are dependent on essentially the same factors that determine dimensional variability in ordinary P/M but are inherently more sensitive to these factors due to the liquid phase sintering effects that accompany the process. Relative to infiltrated surface quality, it is shown that the condition of the infiltrated surface is primarily dependent on the composition of the infiltrant residue and hence, penultimately on the composition of the infiltrant. Thus, reasonably defect-free infiltrated surfaces are obtainable by control of the infiltrant composition.

161. Mechanical Property Potential of Iron Base Infiltrated Parts The effects of composition and processing on the transverse rupture and tensile properties of iron base infiltrated specimens are presented. It is shown that a wide variety of properties are available based on either simple alloy modifications and/or heat treatment of a standardized base compact composition. The observed properties compare favorably with those generally reported for the Compacted Graphite cast irons and the plain Ductile irons in both the as-cast and heat treated conditions.

159. A New Process for Making High Density Parts A new P/M process for making parts potentially having equivalent or better properties than the ductile cast irons and densities up to 7.55 g/cm³is described. The process is in the early stages of development and is based on an essentially pioneer technology that does not depend significantly either on high pressure compaction or high temperature sintering. The process appears to offer considerable potential for economic production of large parts as the associated green densities and process temperatures that are required to implement it are typically below 6.8 g/cm³ and 1175 ^°C respectively. What is currently known of the process and underlying technology is presented in detail.

147. A New Process for Making High Density Parts ( Iron Base Infiltration for High Density) A new P/M process for making parts potentially having equivalent or better properties than the ductile cast irons and densities up to 7.55 g/cm³ is described. The process is in the early stages of development and is based on an essentially pioneer technology that does not depend significantly either on high pressure compaction or high temperature sintering. The process appears to offer considerable potential for economic production of large parts as the associated green densities and process temperatures that are required to implement it are typically below 6.8 g/cm³ and 1175 °C respectively. What is currently known of the process and underlying technology is presented in detail.

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