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Hard alloy

A cemented carbide and alloy technology, applied in the field of cemented carbide materials and their preparation, can solve the problems of easy occurrence of cracks, bending deformation, and difficulty in controlling the carbon content of the alloy, and achieve high control accuracy, no sintering cracks, and bending deformation. small effect

Inactive Publication Date: 2017-01-11
姜蕾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to control the carbon content of the alloy, and it is difficult to guarantee the consistency of the material and the uniformity of the green compact density, especially for large-scale products (unit weight ≥ 10Kg or diameter ≥ 150mm) prone to cracks, bending deformation, and large-scale products cannot be guaranteed The densification and uniformity of properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Preparation of 50Kg cemented carbide (outer diameter 411mm) with a unit weight of 50Kg, composition and weight percentage: nickel: 12%, chromium carbide: 1.2%, tungsten carbide: the balance.

[0014] The preparation of the above cemented carbide includes raw material preparation, wet grinding, drying, pressing, sintering and other processes (the same in the following examples). The raw material composition and weight percentage are: nickel powder: 12%, chromium carbide powder 1.2%, tungsten carbide powder balance. Weigh the raw materials in proportion, add the forming agent, and then ball-mill the prepared mixture in a wet mill, spray dry at a drying temperature of 90-100°C, and then press it into a compact of the specified size and shape, and then load it into dewaxing and sintering The integrated furnace is filled with hydrogen with a dew point of -60°C, and the furnace temperature is increased from room temperature to 550°C within 40 to 45 hours to complete t...

Embodiment 2

[0015] Example 2: Prepare a cemented carbide with a unit weight of 30Kg (outer diameter 380mm), the composition and weight percentage are: nickel: 11%, chromium carbide: 0.75%, tungsten carbide: the balance.

[0016] The raw material composition and weight percentage are: nickel powder: 11%, chromium carbide powder: 0.75%, tungsten carbide powder: balance. Weigh the raw materials in proportion, add the forming agent, ball mill the prepared mixture in a wet mill, spray dry at a drying temperature of 90-100°C, and then press it into a compact of the specified size and shape and load it for dewaxing In the integrated sintering furnace, hydrogen gas with a dew point of -60°C is introduced, and the furnace temperature is raised from room temperature to 500°C within 35-40 hours; then within 8-9 hours, the product is heated again until the product appears liquid phase. The pressure in the furnace is ≤ 0.8mbar; After the liquid phase appears, fill the furnace with high purity argon gas o...

Embodiment 3

[0017] Example 3: Preparation of 10Kg cemented carbide (outer diameter 212mm) per unit weight, composition and weight percentage: nickel: 10%, chromium carbide: 1.0%, tungsten carbide: the balance.

[0018] The raw material composition and weight percentage are: nickel powder: 10%, chromium carbide powder: 1.0%, tungsten carbide powder: the balance. Weigh the raw materials in proportion, add the forming agent, and ball-mill the prepared mixture in a wet mill, spray-dry it at a drying temperature of 90-100℃, and then press it into a compact of the specified size and shape and load it for dewaxing The sintering furnace is filled with hydrogen with a dew point of -60°C, and the furnace temperature is increased from room temperature to 450°C within 25 to 35 hours to complete the removal of the forming agent; then within 7 to 8 hours, the product is heated again until the product appears liquid phase. At this stage, the pressure in the furnace is ≤0.8mbar; after the liquid phase appea...

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Abstract

The invention provides a hard alloy comprising the components by the weight percentage: 6%-18% of nickel, 0.5%-1.5% of chromium carbide, and the balance tungsten carbide; the hard alloy has the advantages of simple components, high hardness, good abrasion resistance, and strong corrosion resistance. A preparation method comprises the steps of raw material preparation, wet grinding, drying, pressing, sintering and the like and comprises the steps: taking the raw material ingredients by the weight percentage: 8%-15% of a nickel powder, 0.5%-1.5% of a chromium carbide powder, and the balance tungsten carbide; during batching, adding a forming agent; carrying out 90-100 DEG C atomizing drying; carrying out dewaxing and sintering integrated process, making a furnace temperature rise to 450 DEG C-550 DEG C within 25-45 h, and completing removal of the forming agent; and then heating within 7-9 hours until the product generates a liquid phase, then introducing high-pure argon gas into a furnace, heating to a final sintering temperature of 1460-1480 DEG C within 1-2 h, carrying out heat preservation for 30-60 minutes and then introducing high-pure argon gas, continuing to carry out heat preservation for 30-60 min, and then cooling. The preparation method not only can prepare general specification alloys, and also can satisfy large alloy preparation and performance requirements.

Description

Technical field [0001] The invention relates to a cemented carbide material and a preparation method thereof, in particular to a cemented carbide material and a preparation method. Background technique [0002] Cemented carbide has obvious advantages in molding molds and sealing rings for strong magnetic powder in the powder metallurgy industry. It not only has high hardness and wear resistance, but also avoids mold sticking during molding of strong magnetic powder and improves the sealing ring. Anti-corrosion ability. In the existing alloy manufacturing methods, the hardness and strength of the alloy are improved by adding a variety of elements, cryogenic treatment, and aging treatment. However, the effect of cryogenic and aging treatment of cemented carbide is still controversial, and the unit weight is relatively large. The product is not suitable or the effect is difficult to detect. Chinese patent application "A cemented carbide containing vanadium and its preparation meth...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05
Inventor 姜蕾
Owner 姜蕾
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