Pressure generation was attempted by multianvils made of sintered diamond in “6-8 type” double-stage system, and the results were compared with those by WC-Co anvils. Pressure smoothly increased up to 22 GPa (the maximum pressure examined) with the increasing load of the press, whereas plastic deformation of WC-Co anvils resulted in a remarkable decrease in efficiency at pressures higher than ∼15 GPa.
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Endo et al. (1987) studied this question.
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