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Metal ceramic material resistant to molten aluminum corrosion, and preparation method and application thereof

A cermet, fusion-resistant technology, applied in the field of corrosion and protection of metal materials, can solve the problems of limited application, easy crack initiation, poor corrosion resistance of molten aluminum, etc.

Active Publication Date: 2020-04-14
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, iron-based alloys and cobalt-based alloys have poor corrosion resistance to molten aluminum; intermetallic compounds and ceramics are brittle and prone to cracks, which makes the corrosion resistance of molten aluminum drop sharply; refractory metals are expensive and difficult to process Large, which limits its application in the aluminum industry; cermets combine the advantages of metal and ceramics, and WC / Co cermets are commonly used. Although the corrosion resistance of WC / Co cermets has improved, they are Still can not show satisfactory corrosion resistance effect

Method used

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  • Metal ceramic material resistant to molten aluminum corrosion, and preparation method and application thereof
  • Metal ceramic material resistant to molten aluminum corrosion, and preparation method and application thereof
  • Metal ceramic material resistant to molten aluminum corrosion, and preparation method and application thereof

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preparation example Construction

[0033] In the present invention, the Al 0.25 The preparation method of FeNiCoCr high entropy alloy preferably comprises the following steps:

[0034] (A) the aluminum powder, iron powder, nickel powder, cobalt powder and chromium powder that mass percent is respectively 2.9%, 24.06%, 25.35%, 25.35% and 22.34% are mixed by ball milling, obtains the ball mill of mechanical alloying;

[0035] (B) drying the ball mill material in a vacuum environment of 80-110°C and -0.1MPa for 8-24 hours to obtain the first dry powder;

[0036] (C) mixing the first dry powder with polyethylene glycol, and continuing to dry at 80-110° C. under a vacuum environment of -0.1 MPa for 8-24 hours to obtain a second dry powder;

[0037] (D) Vacuum sintering the second dry powder to obtain Al 0.25 FeNiCoCr high entropy alloy.

[0038]In the present invention, the purity of the aluminum powder, iron powder, nickel powder, cobalt powder and chromium powder in the step (A) is preferably 99.9%, and the ind...

Embodiment 1

[0055] Al 0.25 Preparation of FeNiCoCr high entropy alloy powder:

[0056] (1) Aluminum powder, iron powder, nickel powder, cobalt powder and chromium powder (all of which are 99.9% in purity and 2 to 5 μm in particle size) with mass percentages of 2.9%, 24.06%, 25.35%, 25.35%, and 22.34% respectively ) into a ball mill for ball milling, adding steel balls with a ball-to-material ratio (mass ratio) of 10:1, and pouring 50mL of absolute ethanol (wet milling medium), and ball milling at a speed of 300r / min for 50h to obtain mechanical alloying mixed powder.

[0057] (2) The mixed powder after ball milling was dried at 90° C. and a vacuum environment of -0.1 MPa for 24 hours, and the quality was added to the dried mixed powder after polyethylene glycol was 1% of the mixed powder mass, at the same temperature Continue to dry under vacuum for 12 hours.

[0058] (3) Put the mixed powder after vacuum drying into the vacuum sintering furnace for vacuum sintering: vacuumize the vacu...

Embodiment 2

[0060] Preparation of cermet materials resistant to corrosion by molten aluminum:

[0061] (1) the mass percent that embodiment 1 prepares is 8% Al 0.25 FeNiCoCr high-entropy alloy powder and 92% Ti(C 0.3 ,N 0.7 ) powder into a ball mill for ball milling, put into balls with a ball-to-material ratio (mass ratio) of 3:1, and pour 80mL of absolute ethanol into it, and ball mill for 3 hours at a speed of 200r / min to obtain a uniform mixed powder; ball mill The scanning electron microscope image of the mixed powder obtained later is as follows figure 1 As shown in (a), after ball milling, the phase of the mixed powder is composed of Ti(C 0.3 ,N 0.7 ) and Al 0.25 FeNiCoCr high-entropy alloy (FCC solid solution) composition, the phase has not changed;

[0062] (2) The mixed powder after ball milling was dried for 24 hours at 100° C., in a vacuum environment of -0.1 MPa, and the polyethylene glycol with a mass of 1% of the mixed powder mass was added to the dried mixed powder, ...

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Abstract

The invention provides a metal ceramic material resistant to molten aluminum corrosion, and a preparation method and an application thereof, and relates to the technical field of metal material corrosion and protection. The chemical composition of the metal ceramic material provided by the invention is Ti(C0.3,N0.7)-Al0.25FeNiCoCr, raw materials for preparing the metal ceramic material comprise Ti(C0.3,N0.7) and an Al0.25FeNiCoCr high-entropy alloy; the mass percentage of the Al0.25FeNiCoCr high-entropy alloy in the metal ceramic material is 8-30%; the microscopic Vickers hardness of the metalceramic material ranges from 779.4 HV[0.2] to 1237.1 HV[0.2]. The metal ceramic material provided by the invention has excellent molten aluminum corrosion resistance and good hardness and toughness,and can be applied to the aluminum industry. The preparation method of the metal ceramic material is simple in process and beneficial to large-scale production.

Description

technical field [0001] The invention relates to the technical field of metal material corrosion and protection, in particular to a cermet material resistant to molten aluminum corrosion and its preparation method and application. Background technique [0002] Aluminum alloy has the advantages of high specific strength, light weight, and low cost, and is widely used in transportation, electronics, energy and other fields. However, molten aluminum is chemically active, has a high temperature (700°C), and is very corrosive. In aluminum industries such as casting, die-casting, and hot-dip aluminum plating, the materials in direct contact with it will fail due to corrosion. Therefore, how to improve the service life of materials in molten aluminum is an urgent problem to be solved. [0003] At present, the materials resistant to molten aluminum corrosion mainly include iron-based alloys, cobalt-based alloys, intermetallic compounds, refractory metals, ceramics, and cermet / cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/05C22C1/10B22F3/105
CPCB22F3/105C22C1/051C22C29/005C22C29/04
Inventor 尹付成谢小龙尹冰冰欧阳雪枚任可柱高志栋
Owner XIANGTAN UNIV
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