Low-density heat-resistant iron-based alloy and preparation method thereof

An iron-based alloy and low-density technology, which is applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problem that it cannot meet the requirements of high power density engine cylinder head materials, and is not suitable for high power density diesel engine cylinder head materials. Working conditions, performance degradation and other problems, to achieve the effect of small powder particle size, improve mechanical properties and thermophysical properties, and reduce density

Active Publication Date: 2018-09-28
XIAN TECH UNIV
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AI Technical Summary

Problems solved by technology

The cylinder head is generally made of gray cast iron or alloy cast iron. The thermal conductivity of aluminum alloy is good, which is conducive to improving the compression ratio, but its strength is low, which is not suitable for the use of high power density diesel engine cylinder head materials; cast iron cylinder head materials (density about 7.3g / cm 3 ) The performance is relatively stable below 400°C, but its performance drops sharply as the temperature rises to 400°C to 600°C, which cannot meet the requirements for the use of cylinder head materials for high-power-density engines in the future. Therefore, a new type of low-density, high-strength, heat-resistant cylinder head material is developed is very critical

Method used

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  • Low-density heat-resistant iron-based alloy and preparation method thereof
  • Low-density heat-resistant iron-based alloy and preparation method thereof
  • Low-density heat-resistant iron-based alloy and preparation method thereof

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preparation example Construction

[0033] The invention relates to a low-density heat-resistant iron-based alloy and a preparation method thereof, in particular to a preparation method of a low-density heat-resistant NiAl / diamond reinforced Fe-based alloy. In the process of using Ni powder and Al powder mechanical alloy, a reaction occurs to generate nanometers. For NiAl powder particles with B2 ordered structure, the diamond is pretreated by a suitable process to form a uniform tungsten coating on the surface, and then NiAl powder and pretreated diamond powder are filled into the ball mill jar, and the The Fe powder is continuously mixed uniformly to obtain fine and uniform NiAl / diamond reinforced Fe-based alloy composite powder, and then a bulk composite material is obtained by hot pressing sintering to obtain a low-density heat-resistant NiAl / diamond reinforced Fe-based material. Include the following steps:

[0034] Step 1: According to the mass ratio of material: grinding ball = 1:10, the raw material powd...

Embodiment 1

[0043] Put Ni powder (20.55g) and Al powder (9.45g) into the zirconia ball mill according to the atomic ratio of raw materials 1:1, add 300g of zirconia grinding balls with a diameter of 10mm, and seal with O type before ball milling After ring sealing, vacuum the ball mill tank and fill it with argon gas, carry out ball milling at a speed of 250r / min, run / stop interval time of 30min, and carry out mixed ball milling under the condition of a total of 70h, to obtain fine and uniform nano-NiAl powder with B2 structure. .

[0044] According to the mass ratio of 75%: 20%: 5%, the synthetic diamond powder (75.00g), copper powder (20.00g) and tungsten powder (5.00g) were mixed and pretreated according to the following process: pickling (hydrochloric acid concentration 10 % (mass percentage), cleaning at 60°C for 30 minutes) → ultrasonic cleaning in absolute ethanol for 20 minutes → ultrasonic cleaning in acetone for 20 minutes → ultrasonic cleaning in absolute ethanol for 20 minutes...

Embodiment 2

[0046] According to the mass fraction of raw materials: 50.00% Fe powder (50.00g) and 50.00% NiAl (50.00g) powder obtained in Example 1 were put into a stainless steel ball mill. Mixing in a ball mill with a rotational speed of 100 r / min for 5 h to obtain the final alloy powder.

[0047] Weigh 30 g of the mixture powder prepared in Example 2, put it into a high-strength graphite mold, and sinter it in a hot-pressing sintering furnace (ZT-40-20Y) produced by Shanghai Chenhua Electric Furnace Co., Ltd. The main sintering process parameters are: the degree of vacuum is 6.67×10 -3 Pa, hot-pressing sintering was heated to 1050°C at a heating rate of 10°C / min and held for 60 minutes, and then cooled to room temperature with the furnace to finally obtain a B2-structured nano-NiAl phase reinforced iron-based alloy sintered body with a mass fraction of 50%.

[0048] The sintered body was mechanically cut into a certain size. According to the specific operation of the experimental poli...

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Abstract

The invention relates to a low-density heat-resistant iron-based alloy and a preparation method thereof. The NiAl powder particles with the ordered structure of nano B2 which are generated in the process of reacting between a Ni powder mechanical alloy and an Al powder mechanical alloy is adoptd, diamond is pretreated by a proper technology to enable the surface of the diamond form a uniform tungsten coating layer, and then the NiAl powder and the pretreated diamond powder are filled into a ball milling tank, and a Fe powder is continuously mixed with the NiAl powder and the pretreated diamondpowder in an uniform mode to obtain a fine and uniform NiAl or diamond-reinforced Fe-based alloy composite powder, and hot-pressing sintering is carried out to obtain a block composite material so asto obtain a high-density heat-resistant NiAl or diamond-reinforced Fe-based material, that is the low-density heat-resistant iron-based alloy. According to the alloy and the method, a mechanical alloying technology is combined with the hot-pressing sintering technology, a developed novel low-density heat-resistant NiAl or diamond-reinforced Fe-based alloy product is low in cost, high in purity, low in density, high in heat conductivity and has the application potential of being applied to a high-power-density diesel engine cylinder cover material.

Description

technical field [0001] The invention relates to an alloy material, in particular to a low-density heat-resistant iron-based alloy and a preparation method thereof. Background technique [0002] With the increase of diesel engine power density, the combustion chamber gas explosion pressure, cylinder head maximum working temperature and piston movement speed of high power density diesel engine will be greatly improved in the future. thermal and mechanical loads. The cylinder head is generally made of gray cast iron or alloy cast iron. Aluminum alloy has good thermal conductivity, which is beneficial to improve the compression ratio, but its strength is low, which is not suitable for the use of high power density diesel engine cylinder head materials; cast iron cylinder head materials (density about 7.3g / cm 3 ) The performance is relatively stable below 400 °C, but with the temperature rising to 400 °C ~ 600 °C, its performance drops significantly, and it cannot meet the requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C26/00C22C30/00C22C38/06C22C38/08C22C38/12C22C33/02B22F9/04B22F1/02B22F3/14
CPCC22C26/00C22C30/00C22C33/0285C22C38/06C22C38/08C22C38/12B22F3/14B22F9/04B22F2009/043B22F2009/041B22F2998/10B22F1/17
Inventor 白亚平李建平杨忠郭永春罗佳佳成超
Owner XIAN TECH UNIV
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