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Cemented carbide mold material and preparation method for warm forging titanium alloy fasteners

A cemented carbide and mold material technology, applied in the field of cemented carbide mold materials and their preparation, can solve the problems of wear, susceptibility to chemical medium erosion, and hard phase grain spalling, etc.

Active Publication Date: 2018-06-19
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional WC-Co cemented carbide, the cemented carbide with Co as the binder has relatively poor corrosion resistance and is easily corroded by chemical media. After the binder phase is corroded, the hard phase skeleton composed of carbides loses its viscosity. The bonding effect of the combined metal leads to a fragile structure, which causes the hard phase grains to peel off under the action of wear, resulting in sharp abrasion and wear of the cemented carbide products.

Method used

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  • Cemented carbide mold material and preparation method for warm forging titanium alloy fasteners
  • Cemented carbide mold material and preparation method for warm forging titanium alloy fasteners
  • Cemented carbide mold material and preparation method for warm forging titanium alloy fasteners

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preparation example Construction

[0033] The preparation method of the above-mentioned cemented carbide mold material for forming titanium alloy fasteners by warm forging, the process steps are:

[0034] 1) Put tungsten carbide, cobalt, nickel, chromium carbide and rhenium into the rolling ball mill according to the proportion, add wet grinding medium and forming agent under the proportion of wet grinding ball and mixture, and ball mill for 10 to 15 hours; among them, wet The grinding balls are cemented carbide balls with a diameter of 6-10 mm, and the mass ratio of wet grinding balls to mixture is 1.5:1. The wet grinding medium is alcohol with a purity higher than 99.7%, and the ratio of the wet grinding medium to the mixture is 1L: 2Kg. The molding agent is paraffin, the oil content is less than 0.5%, and the amount of paraffin added is 1-5% of the total weight of the mixture.

[0035] 2) The wet-milled slurry is dried and granulated in a spray tower with a spray pressure of 1-1.3 MPa;

[0036] 3) The drie...

Embodiment 1

[0044] Using WC powder with Fsss particle size of 6.5μm, by weight ratio WC:Co:Ni:Cr 3 C 2 : Re = 80.5: 18: 1: 0.3: 0.2 formula with powder, the mass ratio of wet grinding balls to the mixture is 1.5:1, the grinding medium is alcohol, the ratio of alcohol to mixture is 1L: 2Kg, the forming agent is paraffin, The addition amount is 2% of the weight of the mixture, ball milled for 15 hours, the powder after ball milling is spray-dried and granulated, and pressed into shape, and finally put into a 6MPa low-pressure sintering furnace at 1380°C for 60 minutes, and the sintering furnace is cooled to room temperature Alloy products were obtained, and their physical and chemical testing results are shown in Table 1.

[0045] Table 1 Example 1 alloy physical and chemical properties

[0046]

[0047] It can be seen from Table 1 that the physical and chemical properties of the alloy are normal, and the hardness is 84.5 degrees, which guarantees the wear resistance of the alloy well,...

Embodiment 2

[0053] Using WC powder with Fsss particle size of 2.5μm, by weight ratio WC:Co:Ni:Cr 3 C 2 : Re = 73.5: 22: 2: 1.5: 1 formula with powder, the mass ratio of wet grinding balls to the mixture is 1.5:1, the grinding medium is alcohol, the ratio of alcohol to mixture is 1L: 2Kg, the molding agent is paraffin, The addition amount is 2% of the weight of the mixture, ball milled for 15 hours, the powder after ball milling is spray-dried and granulated, and pressed into shape, and finally put into a 6MPa low-pressure sintering furnace at 1380°C for 60 minutes, and the sintering furnace is cooled to room temperature Alloy products were obtained, and their physical and chemical testing results are shown in Table 2.

[0054] Table 2 Example 2 alloy physical and chemical properties

[0055]

[0056] It can be seen from Table 2 that the physical and chemical properties of the alloy are normal, and the hardness is 82.8 degrees, which well guarantees the wear resistance of the alloy an...

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Abstract

The invention discloses a hard alloy mold material for a titanium alloy fastener formed through warm forging and a preparation method of the hard alloy mold material. The hard alloy mold material comprises 73.5%-80.5% of WC, 18%-22% of Co, 1%-2% of Ni, 0.3%-1.5% of Cr3C2 and 0.2%-1% of Re. The technique of the hard alloy mold material comprises the steps that WC, Co, Ni, Cr3C2 and Re are placed in a rolling ball mill, wet milling media, forming agents and additives are added under the matching of wet milling balls and mixtures, and ball milling is conducted; slurry obtained after wet milling is dried by means of a spray tower for granulation; and dried alloy powder is subjected to press-forming and placed in a low-pressure sintering furnace for heat preservation, and an alloy product is obtained after the sintering furnace is cooled to the indoor temperature The prepared hard alloy product has good abrasion resistance, corrosion resistance and oxidation resistance; in addition, the strength is high, the service life is long, and the production technique is simple; and compared with WC-Co hard alloy, the service life of the hard alloy mold material can be prolonged by 50% or over.

Description

technical field [0001] The invention relates to a cemented carbide mold material for warm forging titanium alloy fasteners and a preparation method thereof, belonging to the technical field of cemented carbide manufacturing. Background technique [0002] Due to the particularity of the working environment of aviation products and the high reliability requirements, higher performance requirements are also put forward for fastener products. Due to its low density (4.51g / cm 3 ), high strength, high specific strength, wide operating temperature range (-212.22℃~426.66℃), excellent fatigue resistance (the fatigue limit is twice that of steel), so it is very suitable for high-speed aircraft such as airplanes. The application of titanium alloy fasteners produces weight reduction effects, which will have a huge effect on improving the propulsion of the aircraft, increasing the range, saving fuel, and reducing costs. [0003] At present, the raw materials used for aerospace titanium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05
CPCC22C1/051C22C29/005C22C29/08
Inventor 高治山吴何洪杨汉民徐勇
Owner SHAREATE TOOLS
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