High-strength and highly-wear-resistant sintered diamond...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/52 (2006.01) B22F 7/06 (2006.01) B23P 5/00 (2006.01) B24D 3/10 (2006.01)

Patent

CA 2549839

A high-strength and highly-wear-resistant sintered diamond object according to the present invention includes sintered diamond particle having an average particle size of not larger than 2µm and a binder phase as a remaining portion. The content of the sintered diamond particle in the sintered diamond object is not smaller than 80 volume % and not larger than 98 volume %. The binder phase contains at least one element selected from the group consisting of titanium and the like, of which content is not smaller than 0.5 mass % and less than 50 mass %, and contains cobalt, of which content is not smaller than 50 mass % and less than 99.5 mass %. A part of the element or the element as a whole is present as carbide particle having an average particle size of not larger than 0.8µm. A texture of the carbide particle is discontinuous, and adjacent diamond particles are bound to each other. The sintered diamond object attaining excellent wear resistance, chipping resistance, shock resistance, and thermal conductivity can thus be obtained.

La présente invention concerne un produit de diamant fritté à haute résistance et très résistant à l'abrasion composé de particules de diamant fritté dont le diamètre moyen est inférieur ou égal à 2 µm, le reste étant une phase liante. La teneur du produit en particules de diamant fritté est de 80 à 98 % en volume et la phase liante comprend de 0,5 à moins de 50 % en masse d'au moins un élément choisi parmi le titane et d'autres éléments et de 50 à moins de 99,5 % en masse de cobalt, chaque pourcentage étant donné par rapport à la phase liante. Tout ou partie de l'élément est présent en tant que particules de carbure dont le diamètre moyen est inférieur ou égal à 0,8 µm. La structure des particules de carbure est discontinue, tandis que les particules de diamant adjacentes sont liées les unes aux autres. Le produit de diamant fritté possède des propriétés excellentes de résistance à l'abrasion, de résistance à l'ébréchure, de résistance aux chocs et de conductivité thermique.

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