Hot Explosive Pressing of High Strength and Superhard Materials by R Hot Explosive Pressing of High Strength and Superhard Materials by R. Prümmer, Germany and K. Hokamoto, Japan EPNM-2008 May 5-9, 2008. Lisse

Why Hot Expl. Pressing? HIP CEP HEP limited unlimited long short high Hot Isost.Press CEP Cold Expl.Press HEP Hot Expl. Press. Pressure limited unlimited Duration long short several microsec. Diffusion high Plastic deformation low medium Melting,leading to welding no locally very high

HEP Udimet 700 Ni-base Superalloy

Composition of several Nickel based Superalloys

Atomization of Udimet 700 - Powder

Density of Sample after HEP of Udimet 700- Powder

Hardness of Samples vs. Temperature of HEP

Micrograph of Sample showing surface melting 10

Strength of Sample vs. Temperature of HEP 13 Strength of Sample vs. Temperature of HEP Diamond Powder 4-8 micrometer grain size

HEP Diamond Powder, 4-8 um grain size

Principle of Set-up for HEP

Set-up for HEP

Sample Set -up High pressure due to mach stem and end plug

Sample, longitudinally cut open

Micrograph of polished Surface of Diamond Compact

Scanning Electron Micrograph of Fracture Surface

X-ray Diffraction Pattern of Diamond Powder and Compact As-received X-ray Diffraction Pattern of Diamond Powder and Compact as delivered: black, after heat treatment: blue; compacted: red

b sin(q/l) ･107 (m-1) Slope; Lattice strain sin(q/l) ･1010 (m-1) Hall-Williamson Plot of Diamond Powder and Compact

Conclusions The effects of the use of hot explosive pressing are demonstrated at the present investigation for Udimet 700 and diamond powders. Surface melting and softening the powders improves the condition of compaction, and the compacts recovered show improved mechanical properties and the crystalline lattice strain.