Method for preparing Ni-Fe-based high-temperature binder phase hard alloy

A technology of cemented carbide and binder phase, which is applied in the field of preparation of cemented carbide materials, can solve the problems of shortening the service life of cemented carbide and limiting applications, and achieves high precision of composition control, strong process stability and repeatability, and overcomes the The effect of bad influence

Inactive Publication Date: 2015-05-06
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its shortcomings such as high temperature softening, high temperature oxidation, and decarburization, the service life of cemented carbide is shortened, and its application at higher temperatures (>800°C) is limited.

Method used

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  • Method for preparing Ni-Fe-based high-temperature binder phase hard alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, pre-mix nickel powder, iron powder, chromium powder, molybdenum powder and aluminum powder according to the mass percentage 36:34:18:6:6 for 1.5 hours (the pre-mixing equipment is a three-dimensional vortex mixer with a speed of 51 rpm) , and then the premixed powder was high-energy ball milled under the protection of argon atmosphere for 18 hours, the spindle speed of the ball mill was 250 rpm, the ball milling medium was absolute ethanol, the materials of the balls and the ball milling tank were all stainless steel, and the powder, balls, and absolute ethanol The mass ratio is 1:18:0.3, and the ball mill powder is taken out and dried in a vacuum oven at 150°C for 2.5 hours. Weigh WC, TiC, VC and Ni-Fe based high-energy ball mill powder according to the mass percentage of 74:18:0.2:7.8, put it into a ball mill tank under the protection of argon atmosphere, and carry out ordinary ball milling for 25 hours, using a planetary ball mill with a ball mill speed of 170 ...

Embodiment 2

[0025] First, nickel powder, iron powder, chromium powder, molybdenum powder and aluminum powder are pre-mixed for 1.5 hours according to the mass percentage of 38:33:19:7:3, and then the pre-mixed powder is high-energy ball milled under the protection of argon atmosphere for 18 hours. The spindle speed is 280 rpm, the mass ratio of powder, balls, and absolute ethanol is 1:21:0.3, the ball milled powder is taken out and placed in a vacuum drying oven at 150°C for 2.5 hours; it is weighed according to the mass percentage of 72:17.7:0.3:10 Take WC, TiC, VC and Ni-Fe based high-energy ball mill powders, put them into a ball mill tank under the protection of argon atmosphere and carry out ordinary ball milling for 25 hours, the speed of the ball mill is 190 rpm, and the ball-to-material ratio is 15:1.

[0026] Put the ball mill powder into a cold press mold and press it into a green body in a cold press with a pressing force of 230MPa; under the protection of an argon atmosphere, p...

Embodiment 3

[0028] First, pre-mix nickel powder, iron powder, chromium powder, molybdenum powder and aluminum powder according to the mass percentage 34:36:16:8:6 for 1.5 hours, and then high-energy ball mill the pre-mixed powder for 18 hours under the protection of argon atmosphere. The spindle speed is 260 rpm, the mass ratio of powder, balls, and absolute ethanol is 1:16:0.3, the ball milled powder is taken out and placed in a vacuum oven at 150°C for 2.5 hours; it is weighed according to the mass percentage of 73:18:0.2:8.8 Take WC, TiC, VC and Ni-Fe based high-energy ball mill powders, put them into a ball mill tank under the protection of argon atmosphere, and carry out ordinary ball milling for 25 hours. The ball mill speed is 180 rpm, and the ball-to-material ratio is 15:1.

[0029] Put the ball mill powder into a cold press mold and press it into a green body in a cold press with a pressing force of 230 MPa; under the protection of an argon atmosphere, put the green body into a hi...

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Abstract

The invention discloses a method for preparing a Ni-Fe-based high-temperature binder phase hard alloy. The method comprises the following steps of firstly mixing nickel powder, iron powder, chromium powder, molybdenum powder and aluminum powder in a predetermined mass ratio and carrying out high-energy ball milling; carrying out ordinary ball milling on powder subjected to high-energy ball milling, tungsten carbide powder, titanium carbide powder and vanadium carbide powder to obtain a mixed powder; loading the prepared mixed powder into a mold and pressing by virtue of cold press to obtain a green body; carrying out sinter molding on the green body material under the protective atmosphere to finally obtain the Ni-Fe-based high-temperature binder phase hard alloy material. According to the method, Ni-Fe-based mechanical alloying powder instead of Co powder is used as a binder, and the prepared hard alloy has Vickers hardness equal to or greater than 1530 / kg.mm<-2>, flexural strength equal to or greater than 4880MPa and tensile strength equal to or greater than 4562MPa at 1000 DEG C.

Description

technical field [0001] The invention relates to a preparation method of hard alloy material. Background technique [0002] Cemented carbide is a high-temperature wear-resistant material based on refractory metal hard compounds (WC, TiC, etc.), using metal as a binder, and using energy-saving, green, less-chip or no-chip near-net-shape powder metallurgy technology. The excellent comprehensive performance and high cutting processing efficiency of cemented carbide make it widely used in high-speed cutting tools such as high-strength steel and high-quality casting alloys, molds for powder forming and metal plastic processing, impact tools, etc. In response to the current development trend of energy-saving, green and high-efficiency industries in the society, higher requirements are put forward for the comprehensive performance and lifespan of cemented carbide tools and molds, especially in high-end industrial applications such as aerospace, microelectronics, and micromachining. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/00
Inventor 董洪峰郭从盛
Owner SHAANXI UNIV OF TECH
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