A kind of rare earth added ultra-fine grain high toughness WC-10CO cemented carbide material and preparation method

Abstract

The invention discloses a rare earth-added ultra-fine grain high-toughness WC-10Co hard alloy material and a preparation method thereof, which belong to the field of powder metallurgy. The cemented carbide composition is: tungsten carbide 88.7%-89.1%, cobalt 10%, vanadium carbide 0.5%, chromium carbide 0.3%, praseodymium oxide 0.1%-0.5% (or neodymium oxide 0.1%-0.5%). Rare earth oxides can refine the WC grains by affecting the W element content in the binder phase Co and the liquidus temperature during sintering, thereby improving the hardness of the cemented carbide; and the rare earth oxides can enhance the toughness by acting on the Co phase. As the content of rare earth oxides increases, the continuity of the alloy will be deteriorated, so the content of rare earth oxides is limited within a certain range. The invention prepares rare earth-added superfine-grain high-toughness WC-10Co cemented carbide through ball milling, pressing and vacuum sintering. The hard alloy grain size of the present invention is fine, the minimum reaches 190nm, not only has high hardness, the maximum can reach 2100HV, but also has good toughness, the maximum can reach 28.17MPa·m 1 / 2 , There is no public report that cemented carbide products can have such high hardness and high toughness at the same time.

Description

technical field

[0001] The invention relates to a rare earth-added ultra-fine-grain high-toughness WC-10Co hard alloy material and a preparation method thereof, belonging to the field of powder metallurgy. Background technique

[0002] Cemented carbide has excellent properties such as high hardness, high strength, wear resistance and corrosion resistance. Cemented carbide, known as "industrial teeth", is widely used in various fields of industrial production. It is often used in cutting, drilling, mining, forming and other tool manufacturing. In the future, it will be used in aerospace, automobile industry, high-end equipment manufacturing industry, etc. The field is in great demand. With the decrease of WC particle size, its hardness and wear resistance are greatly improved, and its toughness is also greatly improved. Currently common inhibitors include VC, Mo 2 C, Cr 3 C 2 , NbC, TaC, etc.

[0003] There are many cemented carbide patents that have been consulted, mai...

Examples

Embodiment 1

[0035] According to mass fraction WC89%, Co10%, VC0.5%, Cr 3 C 2 0.3% and Pr 6 o 110.2% for batching, with absolute ethanol as the ball milling medium, its addition amount is 240ml / kg, paraffin wax addition amount is 80g / kg, zirconia pellets are added as 500g each of Φ10 and Φ6, put into the polyester ball mill jar, and The ball milling process was carried out for 8 hours at a rotational speed of 150r / min. Then the ball-milled mixture was rinsed through an 80-mesh sieve with absolute ethanol; the sieved mixed powder was placed in a ventilated drying oven for 12 hours to dry. Then put the dried mixed powder directly into the molding die, and use 70MPa pressure to keep the pressure for 2 minutes to prepare the green body. In the vacuum sintering furnace, after the vacuuming is completed, the temperature is raised to 500°C at a rate of 2°C / min and kept for 60 minutes, then the temperature is raised to 1380°C at a rate of 4°C / min, kept for 90 minutes, and finally cooled with t...

Embodiment 2

[0037] According to mass fraction WC88.8%, Co10%, VC0.5%, Cr 3 C 2 0.3% and Pr 6 o 11 0.4% for batching, with absolute ethanol as the ball milling medium, its addition amount is 240ml / kg, paraffin wax addition amount is 80g / kg, zirconia pellets are added as 500g each of Φ10 and Φ6, put into the polyester ball mill jar, and The ball milling process was carried out for 8 hours at a rotational speed of 150r / min. Then the ball-milled mixture was rinsed through an 80-mesh sieve with absolute ethanol; the sieved mixed powder was placed in a ventilated drying oven for 12 hours to dry. Then put the dried mixed powder directly into the molding die, and use 70MPa pressure to keep the pressure for 2 minutes to prepare the green body. In the vacuum sintering furnace, after the vacuuming is completed, the temperature is raised to 500°C at a rate of 2°C / min and kept for 60 minutes, then the temperature is raised to 1380°C at a rate of 4°C / min, kept for 90 minutes, and finally cooled wit...

Embodiment 3

[0039] According to mass fraction WC89.1%, Co10%, VC0.5%, Cr 3 C 2 0.3% and Nd 2 o 3 0.1% for batching, with absolute ethanol as the ball milling medium, its addition amount is 240ml / kg, paraffin wax addition amount is 80g / kg, zirconia pellets are added as 500g each of Φ10 and Φ6, put into the polyester ball mill jar, and The ball milling process was carried out for 8 hours at a rotational speed of 150r / min. Then the ball-milled mixture was rinsed through an 80-mesh sieve with absolute ethanol; the sieved mixed powder was placed in a ventilated drying oven for 12 hours to dry. Then put the dried mixed powder directly into the molding die, and use 70MPa pressure to keep the pressure for 2 minutes to prepare the green body. In the vacuum sintering furnace, after the vacuuming is completed, the temperature is raised to 500°C at a rate of 2°C / min and kept for 60 minutes, then the temperature is raised to 1380°C at a rate of 4°C / min, kept for 90 minutes, and finally cooled with...

technical field

[0001] The invention relates to a rare earth-added ultra-fine-grain high-toughness WC-10Co hard alloy material and a preparation method thereof, belonging to the field of powder metallurgy. Background technique

[0002] Cemented carbide has excellent properties such as high hardness, high strength, wear resistance and corrosion resistance. Cemented carbide, known as "industrial teeth", is widely used in various fields of industrial production. It is often used in cutting, drilling, mining, forming and other tool manufacturing. In the future, it will be used in aerospace, automobile industry, high-end equipment manufacturing industry, etc. The field is in great demand. With the decrease of WC particle size, its hardness and wear resistance are greatly improved, and its toughness is also greatly improved. Currently common inhibitors include VC, Mo 2 C, Cr 3 C 2 , NbC, TaC, etc.

[0003] There are many cemented carbide patents that have been consulted, mai...

Examples

Embodiment 1

[0035] According to mass fraction WC89%, Co10%, VC0.5%, Cr 3 C 2 0.3% and Pr 6 o 110.2% for batching, with absolute ethanol as the ball milling medium, its addition amount is 240ml / kg, paraffin wax addition amount is 80g / kg, zirconia pellets are added as 500g each of Φ10 and Φ6, put into the polyester ball mill jar, and The ball milling process was carried out for 8 hours at a rotational speed of 150r / min. Then the ball-milled mixture was rinsed through an 80-mesh sieve with absolute ethanol; the sieved mixed powder was placed in a ventilated drying oven for 12 hours to dry. Then put the dried mixed powder directly into the molding die, and use 70MPa pressure to keep the pressure for 2 minutes to prepare the green body. In the vacuum sintering furnace, after the vacuuming is completed, the temperature is raised to 500°C at a rate of 2°C / min and kept for 60 minutes, then the temperature is raised to 1380°C at a rate of 4°C / min, kept for 90 minutes, and finally cooled with t...

Embodiment 2

[0037] According to mass fraction WC88.8%, Co10%, VC0.5%, Cr 3 C 2 0.3% and Pr 6 o 11 0.4% for batching, with absolute ethanol as the ball milling medium, its addition amount is 240ml / kg, paraffin wax addition amount is 80g / kg, zirconia pellets are added as 500g each of Φ10 and Φ6, put into the polyester ball mill jar, and The ball milling process was carried out for 8 hours at a rotational speed of 150r / min. Then the ball-milled mixture was rinsed through an 80-mesh sieve with absolute ethanol; the sieved mixed powder was placed in a ventilated drying oven for 12 hours to dry. Then put the dried mixed powder directly into the molding die, and use 70MPa pressure to keep the pressure for 2 minutes to prepare the green body. In the vacuum sintering furnace, after the vacuuming is completed, the temperature is raised to 500°C at a rate of 2°C / min and kept for 60 minutes, then the temperature is raised to 1380°C at a rate of 4°C / min, kept for 90 minutes, and finally cooled wit...

Embodiment 3

[0039] According to mass fraction WC89.1%, Co10%, VC0.5%, Cr 3 C 2 0.3% and Nd 2 o 3 0.1% for batching, with absolute ethanol as the ball milling medium, its addition amount is 240ml / kg, paraffin wax addition amount is 80g / kg, zirconia pellets are added as 500g each of Φ10 and Φ6, put into the polyester ball mill jar, and The ball milling process was carried out for 8 hours at a rotational speed of 150r / min. Then the ball-milled mixture was rinsed through an 80-mesh sieve with absolute ethanol; the sieved mixed powder was placed in a ventilated drying oven for 12 hours to dry. Then put the dried mixed powder directly into the molding die, and use 70MPa pressure to keep the pressure for 2 minutes to prepare the green body. In the vacuum sintering furnace, after the vacuuming is completed, the temperature is raised to 500°C at a rate of 2°C / min and kept for 60 minutes, then the temperature is raised to 1380°C at a rate of 4°C / min, kept for 90 minutes, and finally cooled with...

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