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Ferrous aluminate and strontium aluminate containing high-temperature lubricating composite material and preparation method thereof

A ferrous aluminate and composite material technology, applied in the field of lubricating materials, can solve the problems of friction and wear properties easily affected by temperature, low shear strength bearing capacity, loss of lubrication, etc., and achieve low raw material cost and low wear rate , the effect of easy operation

Active Publication Date: 2019-12-03
XI'AN PETROLEUM UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although solid lubricants have the characteristics of low shear strength, good load-carrying capacity and stability (chemical thermal stability, physical thermal stability and aging stability), and the ability to form a continuous lubricating film with good bonding force on the friction surface , but at high temperatures, most of the solid lubricants will oxidize and lose their lubricating effect, which limits their use at high temperatures
Such as common solid lubricant graphite and MoS 2 , its friction and wear properties are easily affected by temperature. As the temperature increases, graphite is oxidized and loses its lubricating properties, while MoS 2 The oxidation product of molybdenum oxide will lead to an increase in the coefficient of friction

Method used

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  • Ferrous aluminate and strontium aluminate containing high-temperature lubricating composite material and preparation method thereof
  • Ferrous aluminate and strontium aluminate containing high-temperature lubricating composite material and preparation method thereof
  • Ferrous aluminate and strontium aluminate containing high-temperature lubricating composite material and preparation method thereof

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preparation example Construction

[0031] The present invention provides a method for preparing the above-mentioned high-temperature lubricating composite material containing ferrous aluminate and strontium aluminate, comprising the following steps:

[0032] (1) Fe powder is mixed with Al powder, and ball milling is carried out to obtain iron-aluminum solid solution;

[0033] (2) mixing the iron-aluminum solid solution with strontium sulfate, and performing ball milling to obtain a mixed powder;

[0034] (3) performing pre-pressing treatment and hot-pressing sintering on the mixed powder in sequence to obtain a high-temperature lubricating composite material containing ferrous aluminate and strontium aluminate.

[0035] The invention mixes Fe powder and Al powder and performs ball milling treatment to obtain iron-aluminum solid solution. The present invention has no special requirements on the mixing method, and the Fe powder and the Al powder can be uniformly mixed using a mixing method well known to those sk...

Embodiment 1

[0042] A ferrous aluminate (FeAl 2 o 4 ) and strontium aluminate (SrAl 2 o 4 ) of high-temperature lubricating composite materials, by mass percentage, including the following components: SrSO 4 : 3%, Fe powder: 83.61%, Al powder: 13.39%.

[0043] The preparation method comprises the following steps:

[0044] (1) Mix Fe powder and Al powder, add 100mL of absolute ethanol to the planetary high-energy ball mill, use wet ball milling process to ball mill Fe powder and Al powder, ball mill time 10h, speed 250r / min, ball material The ratio is 10:1, and iron-aluminum solid solution is obtained;

[0045] (2) Fe-Al solid solution and SrSO 4 Mix the powders, add 100mL of absolute ethanol for ball milling, the ball milling time is 10h, the speed is 250r / min, and the mixed powder is obtained;

[0046] (3) Put the above-mentioned mixed powder into a graphite mould, use a jack to carry out manual preloading, the preloading pressure is 10MPa, and the holding time is 2min;

[0047] (...

Embodiment 2

[0051] A ferrous aluminate (FeAl 2 o 4 ) and strontium aluminate (SrAl 2 o 4 ) of high-temperature lubricating composite materials, by mass percentage, including the following components: SrSO 4 : 5%, Fe powder: 81.89%, Al powder: 13.11%.

[0052] The preparation method comprises the following steps:

[0053] (1) Mix Fe powder and Al powder, add 100mL of absolute ethanol to the planetary high-energy ball mill, use wet ball milling process to ball mill Fe powder and Al powder, ball milling time 15h, speed 300r / min, ball material The ratio is 5:1, and iron-aluminum solid solution is obtained;

[0054] (2) Fe-Al solid solution and SrSO 4 Mix the powders, add 100mL of absolute ethanol for ball milling, the ball milling time is 15h, the speed is 300r / min, and the mixed powder is obtained;

[0055] (3) Put the above-mentioned mixed powder into a graphite mould, use a jack to carry out manual preloading, the preloading pressure is 10MPa, and the holding time is 2min;

[0056]...

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Abstract

The invention provides a ferrous aluminate and strontium aluminate containing high-temperature lubricating composite material and belongs to the technical field of lubricating materials. The high-temperature lubricating composite material which is provided by the invention is prepared from the following raw materials in percentage by mass: 3-18% of strontium sulfate, 70.68-83.61% of Fe powder and11.32-13.39% of Al powder. According to the material, the strontium sulfate, the Fe powder and the Al powder are adopted as basic raw materials, the Fe powder and the Al powder can form an iron-aluminum solid melt, in the sintering process, a part of Fe is oxidized to form FeO, a part of Al is oxidized to form Al2O3, and Al2O3 and FeO have solid-phase reactions with SrO formed through decomposition of the strontium sulfate to phases FeAl2O4 and SrAl2O4, so that the ferrous aluminate and strontium aluminate containing high-temperature lubricating composite material can be prepared, and the material is remarkable in lubricating performance and wearing reduction effect under a high temperature condition, and is very low in both friction coefficient and wear rate.

Description

technical field [0001] The invention relates to the technical field of lubricating materials, in particular to a high-temperature lubricating composite material containing ferrous aluminate and strontium aluminate and a preparation method thereof. Background technique [0002] With the development of high-tech fields such as aerospace and petroleum industry in the direction of high temperature, high speed and heavy load, the requirements for the strength, stability and wear resistance of high-tech moving parts are becoming more and more stringent. Traditional lubricants such as Grease and lubricating oil can no longer meet the requirements of materials used under harsh conditions such as high temperature. In order to avoid material loss or even material failure caused by alternating thermal loads and friction evolution, it is urgent to develop new lubricating materials with good lubricating effects in high temperature environments. [0003] Solid lubricants can directly pro...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/622C04B35/645C04B35/65
CPCC04B35/44C04B35/622C04B35/645C04B35/65C04B2235/3213C04B2235/402C04B2235/405C04B2235/5436C04B2235/602C04B2235/656C04B2235/6567C04B2235/6581
Inventor 刘峰冯乐任静姝姬帅张骁勇
Owner XI'AN PETROLEUM UNIVERSITY
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