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Silicon carbide-enhanced iron/aluminum composite material and preparation method thereof

A composite material and silicon carbide technology, applied in the field of composite materials, can solve the problems of internal grain growth, reduced oxidation resistance, brittle fracture of network precipitates, etc., to improve high temperature oxidation resistance, reduce thermal expansion coefficient, and good The effect of high temperature strength

Active Publication Date: 2014-12-24
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Nickel-chromium alloys are expensive, and when the temperature is greater than 1000 ° C, the oxidation resistance is significantly reduced
Iron-chromium-aluminum alloys have high carbon content and single alloying elements. When used at high temperatures, the internal grains grow, and the net-like precipitates at the grain boundaries are likely to cause brittle fracture, which seriously affects industrial use.
The prior art discloses a new type of high-resistance electrothermal alloy material (CN1155590A), the alloy formula of which is Fe-(24-32)Al-(0.01-0.2)Ce-(1-6)a, a being Cr and Mn One or two of; Fe-(24-32)Al-(0.01-0.2)Ce(or B)-(0.01-0.3)Zr-(1-6)a-(0.1-2)b, a is One or both of Cr and Mn, and b is one or more of W, Mo, and Nb. The resistivity and high-temperature oxidation resistance of the above alloys are superior to nickel-chromium alloys and iron-chromium-aluminum alloys, but their performance There is still room for further improvement

Method used

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Embodiment Construction

[0014] Further illustrate and understand the present invention through embodiment below.

[0015] (1) Ingredients: silicon carbide reinforcement accounts for 0.9% of the total mass of the composite material, and the element composition and mass percentage of the iron-aluminum alloy matrix are: C: 0.015%, Si: 0.4%, Al: 25%, Zr: 3.2%, Ni: 0.3%, Hf: 1.6%, Nb: 1.7%, V: 1.2%, Mo: 1%, Ce: 0.9%, B: 0.013%, S≤0.001%, P≤0.001%, the balance is iron and Unavoidable impurities, some of the iron raw materials used are iron powder, and others are iron nuggets;

[0016] (2) Pretreatment melting of silicon carbide reinforcement: In order to improve the wettability of SiC particles in the alloy body, first mix SiC particles with iron powder in the raw material evenly, and place them in a vacuum ball mill for ball milling for 20 hours;

[0017] (3) Melting: put the iron-aluminum alloy matrix raw material and the mixed powder after ball milling into a magnetic levitation vacuum induction meltin...

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Abstract

The invention relates to a composite material, and particularly relates to a silicon carbide-enhanced iron / aluminum composite material and a preparation method thereof. The composite material comprises a silicon carbide reinforcement and an iron / aluminum alloy matrix, wherein the reinforcement accounts for 0.1-1% of total mass; the balance is the iron / aluminum alloy matrix; and the silicon carbide reinforcement is SiC particle and is 1-5nm in particle size. The preparation method comprises the following processes: burdening; preprocessing the silicon carbide reinforcement; smelting; homogenizing annealing; forging; carrying out hot rolling; carrying out wire drawing; and carrying out thermal treatment. The material product prepared by the method has good high-temperature strength and inoxidizability, and low coefficient of thermal expansion, the defects in the prior art are overcome, and the composite material has a good industrial application prospect.

Description

Technical field: [0001] The invention relates to a composite material, in particular to a silicon carbide reinforced iron-aluminum composite material and a preparation method thereof. Background technique: [0002] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. At present, the electrothermal alloy material has become an important engineering alloy material, which is suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupies an important position in the national economy. The electric heating element used in industry below 1300 ℃ mainly adopts nickel-chromium alloy and iron-chromium-aluminum alloy. Nickel-chromium alloys are expensive, and when the temperature is greater than 1000 ° C, the oxidation resistance is significantly reduced. Iron-chromium-aluminum alloys have high carbon content and single alloying elements. When used at high temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/06C21D1/26
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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