ULTRA-FINE CEMENTED CARBIDE Ni BINDER PHASE AND TOOL USING THE SAME
a cemented carbide and binder phase technology, applied in the direction of metal borides, boron compounds, other domestic articles, etc., can solve the problems of higher hardness and slightly higher brittleness in comparison with wc, difficult processing of cemented carbide, and lower productivity, so as to achieve high oxidation resistance, high productivity, and high strength
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example 1
[0048]A raw powder of WC having an average grain size of 150 nm (calculated on the basis of the BET value) was used and then intensively wet-pulverized for 72 hours by using a ball mill under the conditions that a compound composition was WC-5.5 mass % VC-22.5 mass % Cr3C2-10 mass % Ni and weight ratio of a cemented carbide ball serving as a pulverizing medium to the powder was 5 to 1. After the intense pulverization, obtained slurry was dried, and then, was stored as powder A. Then, this powder A was used at 2 mass % and the raw powder of WC of 150 nm was added thereto at 98 mass % so that the entire composition became WC-0.11 mass % VC-0.45 mass % Cr3C2-0.2 mass % Ni, and then, wet pulverization was performed for 72 hours under the condition that weight ratio of a cemented carbide ball serving as a pulverizing medium to the powder was 3 to 1. After the wet pulverization, drying was performed. The obtained powder after drying was subjected to cold pressing, vacuum sintering at 1500...
example 2
[0053]A raw powder of WC having an average grain size of 150 nm (calculated on the basis of the BET value) was used and then intensively wet-pulverized for 72 hours by using a ball mill under the conditions that a compound composition was WC-0.88 mass % VC-2.78 mass % Cr3C2-12 mass % Ni and weight ratio of a cemented carbide ball serving as a pulverizing medium to the powder was 5 to 1. After the intense pulverization, obtained slurry was dried, and then, was stored as powder B. Then, this powder B was used at 50 mass % and the raw powder of WC of 150 nm was added thereto at 50 mass % so that the entire composition became WC-0.44 mass % VC-1.39 mass % Cr3C2-6 mass % Ni, and then, wet pulverization was performed for 72 hours under the condition that weight ratio of a cemented carbide ball serving as a pulverizing medium to the powder was 3 to 1. After the wet pulverization, drying was performed. The obtained powder after drying was subjected to cold pressing, vacuum sintering at 1440...
example 3
[0056]A raw powder of WC having an average grain size of 70 nm (calculated on the basis of the BET value) was used and then intensively wet-pulverized for 72 hours by using a ball mill under the conditions that a compound composition was WC-1.56 mass % VC-2.70 mass % Cr3C2-18 mass % Ni and weight ratio of a cemented carbide ball serving as a pulverizing medium to the powder was 5 to 1. After the intense pulverization, obtained slurry was dried, and then, was stored as powder C. Then, this powder C was used at 50 mass % and the raw powder of WC of 70 nm was added thereto at 50 mass % so that the entire composition became WC-0.76 mass % VC-1.35 mass % Cr3C2-9 mass % Ni, and then, wet pulverization was performed for 72 hours under the condition that weight ratio of a cemented carbide ball serving as a pulverizing medium to the powder was 3 to 1. After the wet pulverization, drying was performed. The obtained powder after drying was subjected to cold pressing, vacuum sintering at 1440° ...
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