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Schematic of high pressure sintering methods (up to 1 GPa). (a) The relevant parts are (1) internal smaller graphite die, (2) outer graphite die (3) two binderless tungsten carbide discs placed at the edge of each (4) SiC plunger. (b) The inner (sacrificial) graphite die is inserted inside a higher strength (permanent) die (adapted from [35, 130], respectively).
