METHOD FOR PRODUCING DIAMOND POLYCRYSTAL, DIAMOND POLYCRYSTAL, CUTTING TOOL, WEAR-RESISTANT TOOL, AND GRINDING TOOL

• Main Authors: SUMIYA, Hitoshi, ISHIDA, Yuh
• Format: Patent
• Language: English; French; Japanese
• Published: 19.07.2018
• Subjects: ARTIFICIAL STONE; BORING; BROACHING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS THEREOF; CONCRETE; FILING; GRINDING; INORGANIC CHEMISTRY; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOTOTHERWISE PROVIDED FOR; LIME, MAGNESIA; MACHINE TOOLS; MAKING GEARS OR TOOTHED RACKS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; MILLING; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PLANING; POLISHING; REFRACTORIES; SAWING; SCRAPING; SHEARING; SLAG; SLOTTING; THREAD CUTTING; TOOLS FOR GRINDING, BUFFING, OR SHARPENING; TRANSPORTING; TREATMENT OF NATURAL STONE; TURNING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTIONTHEREWITH

This method for producing a diamond polycrystal comprises: a first step for subjecting a high-pressure-phase carbon powder to a heat treatment at 1300°C or higher to thereby obtain a heat-treated carbon powder; and a second step for sintering the heat-treated carbon powder under a condition of from 12 GPa to 25 GPa and from 1200°C to 2300°C to thereby obtain a diamond polycrystal. Ce procédé de production d'un polycristal de diamant comprend : une première étape consistant à soumettre une poudre de carbone à phase haute pression à un traitement thermique à une température supérieure ou égale à 1 300 °C pour obtenir ainsi une poudre de carbone traitée thermiquement; et une seconde étape consistant à fritter la poudre de carbone traitée thermiquement dans des conditions de 12 GPa à 25 GPa et de 1 200 °C à 2 300 °C pour obtenir ainsi un polycristal de diamant. ダイヤモンド多結晶体の製造方法は、高圧相炭素の粉末を１３００℃以上で熱処理することにより熱処理炭素の粉末を得る第１工程と、上記熱処理炭素の粉末を１２ＧＰａ以上２５ＧＰａ以下かつ１２００℃以上２３００℃以下の条件で焼結することによりダイヤモンド多結晶体を得る第２工程と、を備える。