COATED HARD ALLOY

Japanese Patent JP3833288

B2

PURPOSE: To produce a coated hard alloy excellent in wear resistance and breaking resistance by providing the surface of a base material of sintered hard alloy with an inner and an outer layer composed of carbodies, etc., of Ti to respectively specified film thicknesses while interposing an intermediate layer composed essentially of Al2O3 or ZrO2 between the inner and the outer layers.
CONSTITUTION: This coated hard alloy is obtained by providing the surface of a base material composed of sintered hard alloy or cermet with a hard coating layer. At this time, an inner layer 2 of at least one layer, consisting of the carbide, nitride, carbonitride, carbon oxide, carbonitroxide, or boron nitride of Ti and having 0.1-5μm film thickness, is formed on the base material 1. Then, an intermediate layer 3 of at least one layer, composed essentially of Al2O3 and/or ZrO2 is formed on the layer 2 to a film thickness, preferably, of 5-50μm. Further, an outer layer 4 of at least one layer, consisting of the carbide, nitride, carbonitride, carbon oxide, carbonitroxide, or boron nitride and having a film thickness between 5 and 100μm and thicker than that of the inner layer, is formed on the intermediate layer. By this method, a cutting tool, capable of withstanding high speed and high efficiency strict cutting conditions of ≥ about 1000°C edge temp., can be obtained.

Hideki Moriguchi
Akihiko Ikegaya
Nobuyuki Kitagawa
Katsuya Uchino

JP25589395A

October 11, 2006

October 03, 1995

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Sumitomo Electric Hardmetal Corp.

B23B27/14; C23C16/30; B23P15/28; C23C16/32; C23C16/34; C23C16/36; C23C16/40; C23C28/04; (IPC1-7): C23C16/30; B23B27/14; B23P15/28; C23C16/32; C23C16/34; C23C16/36; C23C16/40; //C23C28/04

JP54032518A
JP61223182A
JP1180980A
JP62192576A
JP2095502A
JP6158325A

Masao Yamamoto

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