Boride modified Mo2FeB2-based metal ceramic and preparation method thereof

A technology based on metals and borides, which is applied in the field of boride-modified Mo2FeB2-based cermets and its preparation, can solve the problems that the hardness and fracture toughness of cermets cannot be improved at the same time, the fracture toughness is not specified in detail, and the hardness of cermets is reduced. Achieve the effects of shortening sintering time, improving comprehensive mechanical properties and reducing time cost

Pending Publication Date: 2022-04-12
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-point bending strength of cermets obtained by the above technical scheme limits its application in high-strength service environments, and there is no detailed description of the fracture toughness
Some scholars have studied the effect of W on multi-step sintering Mo 2 FeB 2 Influenced by the mechanical properties of the base cermet, the doping of W significantly reduces the hardness of the cermet, increases its fracture toughness, and slightly improves the bending strength. Therefore, W is the same as other metal elements and cannot simultaneously increase the hardness of the cermet. and fracture toughness

Method used

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  • Boride modified Mo2FeB2-based metal ceramic and preparation method thereof
  • Boride modified Mo2FeB2-based metal ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of boride modified Mo 2 FeB 2 A base cermet and a preparation method thereof, the raw materials are prepared through mixing, ball milling, drying, molding, and vacuum sintering, including the following steps:

[0028] S1. Mo, FeB, Fe, Cr, Ni, C and LaB with a purity of not less than 99.5% 6 Powder mixing, mixing mass ratio: Mo:44.4%; FeB:29.7%; Fe:20.125%, Cr:2.5%; Ni:2.9%; C:0.375%; LaB 6 :0%.

[0029] S2. Pour the mixed slurry into a ball milling tank, add absolute ethanol as a ball milling medium, the balls used for ball milling are cemented carbide balls, the ball-to-material ratio is 5:1, the ball milling speed is 200r / min, and the ball milling time is 36h .

[0030] S3. Put the ball-milled slurry into a vacuum drying oven, the temperature of the vacuum drying oven is 80° C., and the drying time is 2 hours.

[0031] S4. Compress the dried powder into molding, the molding pressure is 200MPa, and the holding time is 45s.

[0032] S5. Put the pressed cerm...

Embodiment 2

[0040] A kind of boride modified Mo 2 FeB 2 A base cermet and a preparation method thereof, the raw materials are prepared through mixing, ball milling, drying, molding, and vacuum sintering, including the following steps:

[0041] S1. Mo, FeB, Fe, Cr, Ni, C and LaB with a purity of not less than 99.5% 6Powder mixing, mixing mass ratio: Mo:44.4%; FeB:29.7%; Fe:19.875%, Cr:2.5%; Ni:2.9%; C:0.375%; LaB 6 :0.25%.

[0042] S2. Pour the mixed slurry into a ball milling tank, add absolute ethanol as a ball milling medium, the balls used for ball milling are cemented carbide balls, the ball-to-material ratio is 5:1, the ball milling speed is 200r / min, and the ball milling time is 36h .

[0043] S3. Put the ball-milled slurry into a vacuum drying oven, the temperature of the vacuum drying oven is 80° C., and the drying time is 2 hours.

[0044] S4. Compress the dried powder into molding, the molding pressure is 200MPa, and the holding time is 45s.

[0045] S5. Put the pressed ce...

Embodiment 3

[0053] A kind of boride modified Mo 2 FeB 2 A base cermet and a preparation method thereof, the raw materials are prepared through mixing, ball milling, drying, molding, and vacuum sintering, including the following steps:

[0054] S1. Mo, FeB, Fe, Cr, Ni, C and LaB with a purity of not less than 99.5% 6 Powder mixing, mixing mass ratio: Mo:44.4%; FeB:29.7%; Fe:19.625%, Cr:2.5%; Ni:2.9%; C:0.375%; LaB 6 :0.50%.

[0055] S2. Pour the mixed slurry into a ball milling tank, add absolute ethanol as a ball milling medium, the balls used for ball milling are cemented carbide balls, the ball-to-material ratio is 5:1, the ball milling speed is 200r / min, and the ball milling time is 36h .

[0056] S3. Put the ball-milled slurry into a vacuum drying oven, the temperature of the vacuum drying oven is 80° C., and the drying time is 2 hours.

[0057] S4. Compress the dried powder into molding, the molding pressure is 200MPa, and the holding time is 45s.

[0058] S5. Put the pressed c...

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Abstract

The invention discloses a boride modified Mo2FeB2-based metal ceramic and a preparation method of the boride modified Mo2FeB2-based metal ceramic. The Mo2FeB2-based metal ceramic is prepared from Mo, FeB, Fe, Cr, Ni, C and LaB6 powder raw materials through mixing, ball milling, drying, pressing, vacuum sintering and cooling, the hardness of the metal ceramic ranges from 88.5 HRA to 90.3 HRA, the bending strength of the metal ceramic ranges from 1691.93 MPa to 2099.58 MPa, and the fracture toughness of the metal ceramic ranges from 22.7 MPam1 / 2 to 27.6 MPam1 / 2. The composition is simple, the preparation process is convenient and fast, and the cost is low. The rare earth element boride is added, the rare earth element is used for purifying the grain boundary, meanwhile, the boride rare earth element is not doped with other impurities, and the comprehensive mechanical property of the metal ceramic is greatly improved. A rapid cooling mode is used for cooling, a part of Fe-based binding phase structure is changed, and the comprehensive performance is improved. Meanwhile, the sintering period is shortened, and time cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of cermets and preparation, in particular to a boride modified Mo 2 FeB 2 Base cermets and methods for their preparation. Background technique [0002] Ternary boride cermets have the characteristics of low density, high hardness, good electrical conductivity, good wear resistance and corrosion resistance. At present, ternary boride cermet boride has been used in injection molding molds, non-ferrous metal processing tools and kiln lining boards and other fields. [0003] Mo 2 FeB 2 Compared with other ternary boride cermets, the base cermet has lower cost, more excellent comprehensive mechanical properties, and the density is only 3 / 5 of the ordinary hard alloy, and can be closely combined with the steel matrix to form a coating material. Ideal material for tools, molds and wear parts, widely used in cutting tools, hot extrusion abrasives and steel coatings, etc. [0004] In order to improve Mo 2 FeB ...

Claims

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Application Information

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IPC IPC(8): C22C1/05B22F9/04C22C29/14C22C1/06B22F3/02B22F3/10C22C1/10
Inventor 刘文俊李延凤丰平余海洲黄威
Owner CHINA THREE GORGES UNIV
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