Nonmagnetic hard alloy and preparation method

A cemented carbide and non-magnetic alloy technology, which is applied in the field of non-magnetic cemented carbide materials and preparation, can solve the problems of easy cracking, bending deformation, and difficulty in controlling the carbon content of the alloy, and achieves high control accuracy and no sintering cracks. , the effect of small bending deformation

Inactive Publication Date: 2010-12-15
ZHUZHOU HARD ALLOY GRP CO LTD
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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

[0021] Example 1: Prepare a single weight 50Kg non-magnetic hard alloy (outer diameter: 411 mm), the composition and weight percentage are: nickel: 12%, chromium carbide: 1.2%, tungsten carbide: balance.

[0022] The preparation of the above-mentioned non-magnetic hard alloy includes raw material preparation, wet grinding, drying, pressing, sintering and other processes (the following examples are the same). The raw material composition and weight percentage are: nickel powder: 12%, chromium carbide powder 1.2%, tungsten carbide powder balance. Weigh each raw material in proportion, add molding 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 green compact of specified size and shape, then put it into dewaxing and sintering In the integrated furnace, hydrogen gas with a dew point of -60°C is introduced, and the furnace temperature is raised from room temperature to 550°C within 40 to 45 hours to comple...

Embodiment 2

[0023] Example 2: Prepare a single weight 30Kg non-magnetic hard alloy (outer diameter: 380mm), the composition and weight percentage are: nickel: 11%, chromium carbide: 0.75%, tungsten carbide: the balance.

[0024] Raw material composition and weight percentage are: nickel powder: 11%, chromium carbide powder: 0.75%, tungsten carbide powder: balance. Weigh each raw material in proportion, add molding agent, ball-mill the prepared mixture in a wet mill, and then spray dry at a drying temperature of 90-100°C, then press it into a compact of specified size and shape, and put it into 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 to 40 hours; then the temperature is raised again within 8 to 9 hours until the product appears in a liquid phase, and the pressure in the furnace at this stage is ≤ 0.8mbar; after the liquid phase appears, fill the furnace...

Embodiment 3

[0025] Example 3: Prepare a single weight 10Kg non-magnetic hard alloy (outer diameter: 212mm), the composition and weight percentage are: nickel: 10%, chromium carbide: 1.0%, tungsten carbide: balance.

[0026] The raw material composition and weight percentage are: nickel powder: 10%, chromium carbide powder: 1.0%, tungsten carbide powder: balance. Weigh each raw material in proportion, add molding agent, ball-mill the prepared mixture in a wet mill, and then spray dry at a drying temperature of 90-100°C, then press it into a compact of specified size and shape, and put it into 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 450°C within 25 to 35 hours to complete the removal of the forming agent; At this stage, the pressure in the furnace is ≤0.8mbar; after the liquid phase appears, fill the furnace with about 40mbar of high-purity argon gas with a volume perce...

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Abstract

The invention discloses a nonmagnetic hard alloy. The nonmagnetic hard alloy comprises the following components in percentage by weight: 6 to 18 percent of nickel, 0.5 to 1.5 percent of chrome carbide and the balance of tungsten carbide. The nonmagnetic hard alloy has the advantages of simple component, high hardness, good abrasion resistance and strong corrosion resistance. A preparation method for the nonmagnetic hard alloy comprises raw material preparation, wet milling, drying, pressing, sintering and the like, wherein the raw material comprises the following components in percentage by weight: 8 to 15 percent of nickel powder, 0.5 to 1.5 percent of chrome carbide powder and the balance of tungsten carbide powder; during material preparation, a forming agent is added; spray drying is performed at the temperature of between 90 and 100 DEG C; and a de-waxing and sintering integrated process is adopted, the furnace temperature is raised to between 450 and 550 DEG C in 25 to 45 hours, the removal of the forming agent is finished, then the furnace temperature is raised in 7 to 9 hours till the product produces a liquid phase, high-purity argon is introduced into the furnace, the furnace temperature is raised to a final sintering temperature of between 1,460 and 1,480 DEG C for 1 to 2 hours, the heat is preserved for 30 to 60 minutes, then the high-purity argon is introduced into the furnace, the heat is continuously preserved for 30 to 60 minutes, and then the product is cooled. The preparation method not only can prepare the nonmagnetic alloy of common specification, but also can meet the preparation and performance requirements of the large-sized nonmagnetic 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 material and a preparation method thereof. Background technique [0002] Non-magnetic 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 can avoid sticking molds during strong magnetic powder molding, improving Corrosion resistance of the sealing ring. In the existing non-magnetic alloy manufacturing methods, the hardness and strength of non-magnetic alloys are improved by adding various elements, cryogenic treatment, and aging treatment. However, the effects of cryogenic and aging treatments on cemented carbide are still controversial. Products with a larger single weight are also not suitable or the effect is difficult to detect. Chinese patent application "A non-magnetic hard alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 周新华张忠健王力民肖可俊曹劲松王琳琳段石文蒋洪亮
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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