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High strength and toughness Mo2FeB2-based cermet and preparation method thereof

A high-strength toughness, cermet technology, applied in the field of powder metallurgy, can solve the problems of low density and low comprehensive mechanical properties of base cermets, achieve the effect of improving uniformity, improving comprehensive mechanical properties, and inhibiting anisotropic growth

Active Publication Date: 2019-09-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: the purpose of the invention is to provide a kind of high toughness Mo 2 FeB 2 Base cermet and preparation method thereof, solve existing Mo 2 FeB 2 The problem of low density and low comprehensive mechanical properties of base metal ceramics

Method used

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  • High strength and toughness Mo2FeB2-based cermet and preparation method thereof
  • High strength and toughness Mo2FeB2-based cermet and preparation method thereof
  • High strength and toughness Mo2FeB2-based cermet and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] The preparation steps of the cermet of this embodiment are as follows:

[0046] (1) With Mo powder, FeB powder, Fe powder as raw material, prepare 4 kinds of mixed powders according to Table 1;

[0047] (2) Mixing: place the mixed powder in a planetary ball mill for mixing, the ball mill speed is 250rpm, the ball-to-material ratio is 5:1, and the time is 24h;

[0048] (3) Pre-sintering: when the vacuum degree is higher than 1.0×10 -1 It is carried out in a vacuum furnace of Pa, the sintering temperature is 1000°C, and the holding time is 1h, and the Mo 2 FeB 2 Intermediate reaction products dominated by hard phases;

[0049] (4) Pulverization: the intermediate reaction product obtained in step (3) is placed in a vibration mill for pulverization, the vibration frequency is 16.0 Hz, the amplitude is 12.0 mm, and the pulverization time is 5 min to obtain the intermediate reaction product powder;

[0050] (5) take step (4) gained intermediate reaction product, Fe powder...

Embodiment 2

[0058] The preparation steps of the cermet of this embodiment are as follows:

[0059] (1) With Mo powder, FeB powder, Fe powder as raw material, prepare 4 kinds of mixed powders according to Table 1;

[0060] (2) Mixing: put the mixed powder in a planetary ball mill for mixing, the speed of the ball mill is 300rpm, the ratio of ball to material is 5:1, and the time is 24h;

[0061] (3) Pre-sintering: when the vacuum degree is higher than 1.0×10 -1 It is carried out in a vacuum furnace of Pa, the sintering temperature is 1000°C, and the holding time is 1h, and the Mo 2 FeB 2 Intermediate reaction products dominated by hard phases;

[0062] (4) Pulverization: the intermediate reaction product obtained in step (3) is placed in a vibration mill for pulverization, the vibration frequency is 18.0 Hz, the amplitude is 10.0 mm, and the pulverization time is 4 min to obtain the intermediate reaction product powder;

[0063] (5) take step (4) gained intermediate reaction product, F...

Embodiment 3

[0071] The preparation steps of the cermet of this embodiment are as follows:

[0072] (1) With Mo powder, FeB powder, Fe powder as raw material, prepare 4 kinds of mixed powders according to Table 1;

[0073] (2) Mixing: place the mixed powder in a planetary ball mill for mixing, the ball mill speed is 350rpm, the ball-to-material ratio is 5:1, and the time is 24h;

[0074] (3) Pre-sintering: when the vacuum degree is higher than 1.0×10 -1It is carried out in a vacuum furnace of Pa, the sintering temperature is 1000°C, and the holding time is 1h, and the Mo 2 FeB 2 Intermediate reaction products dominated by hard phases;

[0075] (4) Pulverization: the intermediate reaction product obtained in step (3) is placed in a vibrating ore mill for pulverization, and the vibration frequency is 20.0 Hz, the amplitude is 8.0 mm, and the pulverization time is 3 min, and the intermediate reaction product powder is obtained ;

[0076] (5) take step (4) gained intermediate reaction pro...

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Abstract

The invention discloses a high strength and toughness Mo2FeB2-based cermet and a preparation method of the high strength and toughness Mo2FeB2-based cermet. The high-strength and toughness Mo2FeB2-based cermet comprises the following steps that firstly, mixed powder is prepared by using Mo powder, FeB powder and Fe powder as raw materials and is placed in a vacuum furnace after ball milling and drying and pre-sintered, and an intermediate reaction product mainly composed of a Mo2FeB2 hard phase is obtained; subsequently, the obtained intermediate reaction product is pulverized, and intermediate reaction product powder is obtained; and then, the obtained intermediate reaction product powder, Fe powder, Cr powder, Ni powder and graphite powder are used as raw materials to prepare cermet mixed powder, ball milling mixing, press molding and the like are performed, finally final sintering is performed in the vacuum furnace, and the high strength and toughness Mo2FeB2 based cermet is obtained. The cermet prepared by the method has high bending strength and fracture toughness and good comprehensive mechanical properties, and the preparation method has simple operation and broad application prospect.

Description

technical field [0001] The invention relates to a high strength and toughness Mo 2 FeB 2 A base cermet and a preparation method thereof belong to the technical field of powder metallurgy. Background technique [0002] Mo 2 FeB 2 The base cermet has excellent wear resistance, high temperature resistance and corrosion resistance of transition metal borides, and has a similar thermal expansion coefficient to steel, and Mo 2 NiB 2 Compared with WCoB-based cermets, it not only has low preparation cost, but also has relatively good comprehensive mechanical properties. Therefore, it has been applied in some wear-resistant and corrosion-resistant occasions, such as injection molding machine parts, can making tools and copper extrusion dies, etc. It is a hard material with great development prospects. However, the hard phase grains tend to form a boride network structure through anisotropic growth, and this structure will hinder the filling of the relative pores of the eutectic...

Claims

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Application Information

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IPC IPC(8): C22C29/14C22C1/05
CPCC22C1/058C22C29/14
Inventor 郑勇吴昊张家杰章国涛柯峥徐翔宇丁青军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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