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Method for preparing lamellar FeAl-based composite plates

A composite material and multi-layer composite technology, which is applied in the field of composite material sheet preparation, can solve problems such as poor strength and high room temperature brittleness, and achieve the effects of simple process, low production cost, and expanded application fields.

Inactive Publication Date: 2011-08-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is to solve the problems of high room temperature brittleness and poor strength of existing iron-aluminum intermetallic compounds, and to provide a method for preparing a layered FeAl-based composite material plate

Method used

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  • Method for preparing lamellar FeAl-based composite plates

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specific Embodiment approach 1

[0009] Specific Embodiment 1: The preparation method of this embodiment is as follows: 1. Add 80 to 95 parts by volume of aluminum matrix powder and 5 to 20 parts by volume of ceramic particles into a powder mixer, and mix the powder by ball milling to obtain uniformly mixed powder. Raw material powder; 2. Put the uniformly mixed raw material powder into a graphite mold, cold press it, and then put the cold-pressed material into a vacuum hot-press furnace. Under the condition of 500℃~630℃ and the pressure of 15MPa~35MPa, keep the pressure for 60min~120min, then cool to room temperature, and release the mold to obtain the blank of ceramic particle reinforced aluminum matrix composite material; 3. Under the condition of 300℃~600℃ , the ceramic particle reinforced aluminum matrix composite material blank is rolled into a thin plate, and then annealed to obtain a ceramic particle reinforced aluminum matrix composite material plate with a thickness of 0.2 mm to 2 mm; 4. The ceramic ...

specific Embodiment approach 2

[0011] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, 85 parts by volume of aluminum matrix powder and 15 parts by volume of ceramic particles are added to the powder mixer, and the powder is mixed by ball milling to obtain uniform mixing. raw material powder. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that in step 2, the pressure is maintained for 120 minutes under the conditions of vacuum degree of 0.01 Pa, temperature of 600° C., and pressure of 25 MPa. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a method for preparing lamellar FeAl-based composite plates, which relates to a method for preparing composite plates and solves the problems of large brittleness and poor strength of the conventional iron-aluminum intermetallic compounds at room temperature. The preparation method comprises the following steps of: mixing aluminum substrate powder and ceramic granules uniformly, performing cold molding, and putting the mixture into a vacuum hot-pressing furnace to obtain ceramic granule-enhanced aluminum-based composite blanks; and rolling the ceramic granule-enhanced aluminum-based composite blanks to form thin plates, stacking alternately with pure iron plates, and performing hot pressing, hot rolling and heat treatment to obtain the lamellar FeAl-based composite plates. Interfaces of composites prepared by the method are flat and straight and high in combination; the broken bending strength of the composite plates at room temperature can reach 1,132 MPa and is about 1.4 times that of a substrate; and compared with that of the substrate, the yield strength of the composite plates at the temperature of 750 DEG C is improved substantially, namely is improved by about 26 percent.

Description

technical field [0001] The invention relates to a preparation method of a composite material plate. Background technique [0002] Fe-Al intermetallic compounds (FeAl and Fe 3 Al) rich in raw materials, low cost, low density, high specific strength, good wear resistance, oxidation resistance (vulcanization), excellent corrosion resistance, as a new generation of medium and high temperature structural materials and stainless steel substitute materials, in furnace devices, heat exchange pipes , automotive valves, molten salt equipment components and other high-temperature harsh environments have broad prospects for application. However, so far, FeAl alloys have not achieved large-scale industrial applications. The main reason is that the two major shortcomings of iron-aluminum intermetallic compounds have not been fundamentally resolved, namely: high room temperature brittleness, and the higher the Al content, the weaker the grain boundary. The more serious the brittleness, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04
Inventor 范国华闫旭东耿林王庆伟逄锦程郑镇洙
Owner HARBIN INST OF TECH
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