Anecdote of the Diamond Synthesis (4) “Challenges to larger high - pressure volume designs”

Ishizuka's designs with the characteristic use of a hard sintered alumina cylinder permitted to replace the conventional die material of tungsten carbide with steels which were more ready for the construction of larger components. Thus larger apparatuses were built for the diamond production with a 7000- ton hydraulic press. The most urgent problem in the operation was how to prepare cylinders fast enough to keep pace with the scheduled production.