1. 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, Lisse

2. 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

4. HEP
Udimet 700
Ni-base Superalloy

5. Composition of several Nickel based Superalloys

6. Atomization of Udimet 700 - Powder

8. Density of Sample after HEP of Udimet 700- Powder

9. Hardness of Samples vs. Temperature of HEP

10. Micrograph of Sample showing surface melting10

11. Strength of Sample vs. Temperature of HEP13
Strength of Sample vs. Temperature of HEP
Diamond Powder
4-8 micrometer grain size

12. HEP
Diamond Powder,
4-8 um grain size

13. Principle of Set-up for HEP

14. Set-up for HEP

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

16. Sample, longitudinally cut open

17. Micrograph of polished Surface of Diamond Compact

18. Scanning Electron Micrograph of Fracture Surface

19. 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

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

21. 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.