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Light and high-thermal conductivity Fe-Al-based alloy and preparation method thereof

A high thermal conductivity, base alloy technology, applied in the field of lightweight high thermal conductivity alloys, can solve the problems of decreased strength and creep resistance, low thermal conductivity of Fe-Al alloys, large room temperature brittleness, etc., and achieve excellent corrosion resistance. The effect of oxidation performance, uniform distribution, high specific strength

Active Publication Date: 2017-02-01
XIAN TECHNOLOGICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its brittleness at room temperature is large and its strength and creep resistance are significantly reduced above 600 ° C. At the same time, the thermal conductivity of Fe-Al alloy is low (about 15W / (m K))
At present, the shortcomings of its high brittleness at room temperature and the obvious decline in strength and creep resistance above 600 °C have been resolved.

Method used

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  • Light and high-thermal conductivity Fe-Al-based alloy and preparation method thereof
  • Light and high-thermal conductivity Fe-Al-based alloy and preparation method thereof
  • Light and high-thermal conductivity Fe-Al-based alloy and preparation method thereof

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preparation example Construction

[0031] A kind of preparation method of lightweight high thermal conductivity Fe-Al base alloy comprises the following steps:

[0032] Step 1: Preparation of chemically modified graphene oxide: Dissolve 10g of 3-aminopropyltriethoxysilane in a mixture of deionized water and ethanol (mass ratio 9:1), stir well and add 0.5g of graphite Graphene oxide was uniformly dispersed and reacted in a 50°C water bath environment. After the end, it was washed three times with deionized water and ethanol, centrifuged and freeze-dried to obtain chemically modified graphene oxide, which has better dispersibility than ordinary graphene.

[0033] Step 2: Weighing 81.85-86.20% Fe powder, 13.15-13.80% Al powder and 0-5.00% graphene powder by mass fraction;

[0034] Step 3: According to the mass ratio of material: grinding ball = 1:10 (where: material refers to iron powder and aluminum powder), put the above raw material powder into a ball mill tank that is evacuated and filled with argon gas at a s...

Embodiment 1

[0041] According to the mass fraction of raw materials: 86.20% Fe powder (86.20g) and 13.8% Al (13.80g) powder are put into a stainless steel ball mill tank, and 1000g of stainless steel balls with a diameter of 10mm are added. The ball mill tank is evacuated and filled with argon, at a speed of 200r min -1 and the ball milling time is 20h for mixed ball milling to obtain Fe(Al) solid solution powder.

[0042] Weigh 30 g of the mixture powder prepared in Example 1, put it into a high-strength graphite mold, and sinter in a hot-press sintering furnace (ZT-40-20Y) produced by Shanghai Chenhua Electric Furnace Co., Ltd. The main sintering process parameters are: sintering pressure 35MPa, vacuum degree 6.67×10 -3Pa, after hot pressing and sintering for 30min, the temperature was raised to 1100°C at a heating rate of 10°C / min and kept for 90min, and then cooled to room temperature with the furnace.

[0043] The sintered body is cut into a certain size by mechanical cutting. Accor...

Embodiment 2

[0045] According to the mass fraction of raw materials: 85.30% Fe powder (86.30g) and 13.7% Al (13.70g) powder are put into a stainless steel ball mill tank, and 1000g of stainless steel balls with a diameter of 10mm are added. The ball mill tank is evacuated and filled with argon, at a speed of 200r min -1 and the ball milling time is 20h for mixed ball milling to obtain Fe(Al) solid solution powder. figure 2 Scanning electron micrographs and XRD test results of the Fe(Al) powder prepared in Example 2. From figure 2 It can be seen that the powder particles are relatively small and round, and the XRD test results show that the Fe powder and Al powder are completely reacted, all of which are Fe(Al) solid solution, and there is no remaining Fe powder and Al powder. Add 1.0% graphene powder (1.0g) subsequently, continue ball milling 2h with 200r / min rotating speed (specific process: mix powder 20min each time, stop mixing powder 10min; Time adds up to 2h; Wet mix: medium acet...

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Abstract

The invention relates to a light and high-thermal conductivity Fe-Al-based alloy and a preparation method thereof. In the future, the requirement of armored assault equipment like novel main battle tanks on the maneuvering performance during air drop and air transportation in mountains and highlands is further improved, so that an engine is supposed to be higher in power and lighter in weight, and the study of the light and high-thermal conductivity material technology becomes an important development direction. The preparation method comprises the steps that Fe powder and Al powder are weighed; the Fe powder, the Al powder and grinding balls are put into a ball milling pot which is vacuumized and is inflated with argon to be subjected to mechanical alloying ball milling, the Fe powder and the Al powder are subjected to solid solution treatment and generate an Fe (Al) solid solution, then, graphene powder is put into the ball milling pot and is continuously mixed with the Fe (Al) solid solution uniformly, and fine and uniform graphene / Fe (Al) composite powder is obtained; and the graphene / Fe (Al) composite powder subjected to mechanical alloying is put into a graphite mold, and a required blocky composite is formed through hot press sintering. According to the preparation method, the preparation process is short in time, and an obtained product is high in purity, high in thermal conductivity and good in compactness.

Description

[0001] 1. Technical field: [0002] The invention relates to the technical field of a lightweight high thermal conductivity alloy, in particular to a lightweight high thermal conductivity Fe-Al-based alloy and a preparation method thereof. [0003] 2. Background technology: [0004] The development of an engine has never been separated from the guarantee of material technology, which is the core key technology of an advanced engine. The increase of the power density per liter will lead to the increase of the combustion temperature and pressure. Therefore, with the continuous increase of the power density per liter, the temperature and pressure of the key components of the diesel engine combustion chamber will inevitably be higher and higher, which puts higher demands on the performance of materials. Requirements: 1) High strength and toughness, thermal fatigue resistance, good thermal conductivity. The better the thermal conductivity of the material, the smaller the coefficien...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C33/02B22F3/14B22F9/04
CPCB22F3/14B22F9/04B22F2003/145B22F2009/041B22F2998/10C22C33/0278C22C38/06
Inventor 白亚平李建平郭永春杨忠张婷颖
Owner XIAN TECHNOLOGICAL UNIV
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