05-08-2021 дата публикации
Номер: US20210237227A1
Принадлежит:
A polycrystalline abrasive grain includes: a plurality of cBN particles; and a binder that binds the plurality of cBN particles, wherein the binder includes at least one of nitride, carbide, and carbonitride of one selected from a group consisting of a group 4a metal, a group 5a metal, and a group 6a metal in a periodic table, and a content of the binder in the polycrystalline abrasive grain is more than or equal to 5 volume % and less than or equal to 50 volume %. 1: A polycrystalline abrasive grain comprising:a plurality of high-pressure phase type boron nitride particles; anda binder that binds the plurality of high-pressure phase type boron nitride particles, whereinthe binder includes at least one of nitride, carbide, and carbonitride of at least one selected from a group consisting of a group 4a metal, a group 5a metal, and a group 6a metal in a periodic table, anda content of the binder in the polycrystalline abrasive grain is more than or equal to 5 volume % and less than or equal to 50 volume %.2: The polycrystalline abrasive grain according to claim 1 , wherein the polycrystalline abrasive grain has a first surface formed at an outer surface of the polycrystalline abrasive grain claim 1 , and at least one recess is formed in the first surface.3: The polycrystalline abrasive grain according to claim 2 , wherein a value obtained by dividing a total area of the recess by a total area of the first surface and the recess of the polycrystalline abrasive grain is more than or equal to 0.5 and less than or equal to 0.99.4: The polycrystalline abrasive grain according to claim 1 , wherein the binder includes at least one selected from a group consisting of TiN claim 1 , TiCN claim 1 , ZrN claim 1 , HfN claim 1 , VN claim 1 , NbCN claim 1 , TaC claim 1 , CrN claim 1 , MoC claim 1 , and WC.5: A grinding wheel comprising the polycrystalline abrasive grain recited in . The present invention relates to a polycrystalline abrasive grain and a grinding wheel including the ...
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