High-temperature gravitational pressure compressed formation manner of powder raw materials and container null for high-temperature gravitational pressure pressurization formation

摘要

PURPOSE:To manufacture a forming product having very near desired shape by constituting a vessel for hot hydrostatic pressurized forming with a forming vessel and an auxiliary vessel, which is more shrinkable than the above vessel, packing the raw material powder in both vessels and executing the forming. CONSTITUTION:The vessel 1 for using to the hot hydrostatic pressurization is constituted with the forming vessel 2 and the auxiliary vessel 3, which is shrunk at easier than the forming vessel 2. The metal powder 8 is packed in order into a cavity 5 and runner 6 in the forming vessel 2 and the auxiliary vessel 3 through degassing tube 7 in vacuum, and the degassing tube 7 is closed. Successively, the forming vessel 2 and the auxiliary vessel 3 are hot-hydrostatic- pressurized at about 1,200 deg.C and about 1,000kg/mm2, and then the auxiliary vessel 3 is shrunk, and the raw material powder 8 is softened in order of the auxiliary vessel 3, runner 6 and the cavity 5. By this method, the raw material powder 8 in the auxiliary vessel 3 is shifted into the forming vessel 2 and the forming product having very near desired shape is obtd.