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Vanadium-containing non-magnesium hard alloy and preparation method thereof

A hard alloy and alloy technology, applied in the field of non-magnetic hard alloy and its preparation, can solve the problems of difficult demoulding, non-corrosion resistance, high production cost, etc., to improve hardness and wear resistance, accelerate densification, The effect of reducing porosity

Inactive Publication Date: 2008-09-17
ZHUZHOU JINGGONG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cemented carbide mold material in the magnetic material production industry requires itself to be non-magnetic. If ordinary tungsten carbide-cobalt cemented carbide is used, it has a certain degree of magnetism. If it is used as a mold material, the sticking phenomenon is serious during the production process and it is not easy to detach. Die, low qualified rate of pressing, high production cost
And because ordinary tungsten carbide-cobalt cemented carbide materials are easy to oxidize and not resistant to corrosion, their application range is greatly limited
The non-magnetic hard alloy materials in the prior art generally use tungsten carbide, cobalt, chromium, and molybdenum as basic components, which reduces the magnetic properties of the hard alloy mold material to a certain extent, but its strength and hardness are low, such as China Patent CN 03118356.5 discloses (non-magnetic hard alloy and its production method), the hardness of the non-magnetic alloy produced by it is only 80-86HRA, and the bending strength is 2200N / mm 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: a kind of nonmagnetic cemented carbide, it is main component with tungsten carbide, and the composition and weight percent of this alloy are: tungsten carbide powder 90%, nickel powder 8%, chromium carbide powder 1.5%, vanadium carbide Powder 0.5%.

[0034] The preparation method of above-mentioned non-magnetic hard alloy comprises steps such as batching, wet milling, drying, pressing, sintering, inspection, takes each raw material in proportion, and the weight of prepared mixture is 150Kg, and the prepared mixture is prepared at 180 In the non-magnetic hard alloy liner wet mill, non-magnetic hard alloy balls are used as the grinding material, and alcohol is used as the medium for wet grinding. The ball-to-material ratio is 5:1, the liquid-solid ratio is 350ml / kg, and the ball mill speed The grinding time is 36r / min and the grinding time is 48 hours. The ground slurry is vacuum-dried at a drying temperature of 90°C and a drying time of 8 hours. The dried m...

Embodiment 2

[0035] Embodiment 2: a kind of non-magnetic hard alloy, it is main component with tungsten carbide, and the composition and weight percent of this alloy are: tungsten carbide powder 85%, nickel powder 13.2%, chromium carbide powder 1.0%, vanadium carbide Powder 0.8%.

[0036] The preparation method of above-mentioned non-magnetic hard alloy comprises steps such as batching, wet milling, drying, pressing, sintering, inspection, takes each raw material in proportion, and the weight of prepared mixture is 150Kg, and the prepared mixture is prepared at 180 In the non-magnetic hard alloy liner wet mill, use alcohol or acetone as the medium for wet milling, the ball-to-material ratio is 5:1, the liquid-solid ratio is 350ml / kg, the ball mill speed is 36r / min, and the grinding time is 48 hours, the ground slurry was vacuum-dried, the drying temperature was 90°C, and the drying time was 8 hours. The dried material was sieved with a 100-mesh screen, mixed with a molding agent, and prepa...

Embodiment 3

[0038] A non-magnetic hard alloy, which uses tungsten carbide as the main component, and the composition and weight percentage of the alloy are: 80% of tungsten carbide powder, 16.5% of nickel powder, 2.0% of chromium carbide powder, and 1.5% of vanadium carbide powder.

[0039] The preparation method of above-mentioned non-magnetic hard alloy comprises steps such as batching, wet milling, drying, pressing, sintering, inspection, takes each raw material in proportion, and the weight of prepared mixture is 150Kg, and the prepared mixture is prepared at 180 In the non-magnetic hard alloy liner wet mill, use alcohol or acetone as the medium for wet milling, the ball-to-material ratio is 5:1, the liquid-solid ratio is 350ml / kg, the ball mill speed is 36r / min, and the grinding time is 48 hours, the ground slurry was vacuum-dried, the drying temperature was 90°C, and the drying time was 8 hours. The dried material was sieved with a 100-mesh screen, mixed with a molding agent, and pre...

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Abstract

The invention relates to a nonmagnetic hard alloy material and a preparation method thereof. The alloy comprises (wt %) tungsten carbide 75-90, nickel powder 8-20, chromium carbide 0.5-3.0, and vanadium carbide 0.3-2.5. The preparation method comprises compounding, wet grinding, drying, pressing, sintering and checking, wherein in the wet grinding step, a nonmagnetic alloy lining board wet grinder is used, alcohol or acetone is added as grinding medium, nonmagnetic hard alloy balls is used as grinding material, the ratio of grinding medium to material is 5:1, the solid-to-liquid ratio is 350ml / Kg, and the wet grinding time is 48-56 hours; and pressure sintering is adopted. In the inventive nonmagnetic hard alloy material, fine-particle tungsten carbide powder (1.0-1.5 mum) is used as hard phase, so as to improve the hardness and abrasion resistance of the alloy. The nickel is used as binder, and a small amount of chromium carbide and vanadium carbide are added as tungsten carbide grain growth inhibitor, so as to refine tungsten carbide crystal grains, and further improve the hardness and abrasion resistance of the alloy. The pressure sintering technique accelerates densification speed during sintering process, effectively reduces porosity of the alloy, and remarkably improves the strength of the alloy.

Description

technical field [0001] The invention relates to a hard alloy material and a preparation method thereof, in particular to a non-magnetic hard alloy and a preparation method thereof. Background technique [0002] Cemented carbide is known as the tooth of industry because of its high strength and high hardness. It is a widely used tool material and wear-resistant material. The cemented carbide mold material in the magnetic material production industry requires itself to be non-magnetic. If ordinary tungsten carbide-cobalt cemented carbide is used, it has a certain degree of magnetism. If it is used as a mold material, the sticking phenomenon is serious during the production process and it is not easy to detach. Die, the qualified rate of pressing is low, and the production cost is high. And because ordinary tungsten carbide-cobalt cemented carbide materials are easy to oxidize and not resistant to corrosion, their application range is greatly limited. The non-magnetic hard al...

Claims

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Application Information

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IPC IPC(8): C22C29/08B22F3/10
Inventor 陈明
Owner ZHUZHOU JINGGONG CEMENTED CARBIDE
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