16:10 〜 16:30
[14A-T2-07] Various Properties of High-Density Sintered Stainless Steel Obtained by Powder Compacting
キーワード： Stainless Steel, Hight density, Green machining, Small diameter holes.
Stainless steel is used in a wide range of applications due to excellent mechanical properties and corrosion resistance. However, there is a difficulty in forming unmachinable small diameter and deep holes since stainless steel is a difficult-to-cut material. Additionally, the application of sintered stainless steel is limited to items that do not require airtightness due to the presence of pores inside the material. Although a method of increasing the density using liquid phase sintering was considered to reduce internal pores of sintered stainless steel, it significantly affects dimensional accuracy and post-processing after sintering because of the generation of large amount of shrinkage. In order to solve the above issues, we developed a high-density green machining method that combines a technique to increase density during powder compaction and a green machining process. We successfully manufactured a sintered stainless steel material with a density of 95 vol% and no-leakage even under 70Mpa hydrogen.