High-temperature-resistant and oxidation-resistant metal-based self-lubricating composite material and preparation method thereof

A composite material and anti-oxidation technology, which is applied in the field of high temperature corrosion resistance and self-lubrication, can solve the problems of not being able to fully combine self-lubrication and high-temperature oxidation resistance, achieve excellent high-temperature oxidation resistance, improve high-temperature oxidation resistance, and improve aluminum The effect of content

Active Publication Date: 2017-09-19
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a metal-based self-lubricating composite material with high temperature resistance and oxidation resistance and its preparation method, so as to solve the problems in the prior art that the dual functions of self-lubrication and high temperature oxidation resistance cannot be fully combined.

Method used

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  • High-temperature-resistant and oxidation-resistant metal-based self-lubricating composite material and preparation method thereof
  • High-temperature-resistant and oxidation-resistant metal-based self-lubricating composite material and preparation method thereof
  • High-temperature-resistant and oxidation-resistant metal-based self-lubricating composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this embodiment, nickel-based alloy Ni-27Cr-11Al-0.5Y (wt.%) is used as the alloy matrix, cerium oxide is used as an antioxidant, eutectic with calcium fluoride / barium fluoride, enamel and aluminum oxide Together, prepare this composite material, its concrete preparation parameter is as follows:

[0047] (1) Enamel micropowder: the formula for smelting enamel glaze is 60wt% of silicon dioxide, 5wt% of diboron trioxide, 10wt% of aluminum oxide, 9wt% of sodium oxide, 7wt% of potassium oxide and 9wt% of zinc oxide. According to the proportion of enamel ingredients, mix various oxides by ball milling at a speed of 320 rpm for 24 hours; heat and smelt at 1500 ° C, and water quench to obtain enamel glaze; planetary ball milling for 100 hours to obtain enamel with a particle size of less than 10 μm Enamel micropowder.

[0048] (2) Powder mixing: the composite material is in accordance with the following composition ratio, nickel-based alloy 72wt%, calcium fluoride / barium f...

Embodiment 2

[0063] The difference from Example 1 is that the high-temperature and oxidation-resistant metal-based self-lubricating composite material consists of 82wt% nickel base alloy, 4wt% calcium fluoride / barium fluoride eutectic (the weight of calcium fluoride and barium fluoride The percentages are 32% and 68%, respectively), enamel 5wt%, aluminum oxide 6wt%, cerium oxide 3wt%.

[0064] After being oxidized at 900°C for 100 hours, the oxidation product of the composite material is aluminum oxide, and the oxidation weight gain is only 0.35 mg / cm 2 , has excellent high temperature oxidation resistance. And the comparison test sample NiCr alloy (the alloy matrix phase selected in the high temperature self-lubricating composite material reported by NASA in the United States), its oxidation product after oxidation is dichromium trioxide, and the oxidation weight gain reaches 2.61mg / cm 2 , and the oxidation rate is 7 times higher than that of the high-temperature-resistant and anti-oxida...

Embodiment 3

[0066] The difference from Example 1 is that the nickel-based alloy composition selected for the preparation of the high-temperature-resistant and anti-oxidation composite material is Ni-8Co-16Cr-12Al-3.5Mo-4Ti (wt.%).

[0067] The friction coefficient curve of the composite material at 800°C is as follows image 3 As shown, the average friction coefficient is only 0.18, and the friction curve is smooth, and the wear amount is 1.9×10 -6 mm 3 / (Nm). And the NiCr-CaF reported in the literature (Surf.Coat.Technol.203(2009) 3058) 2 / BaF 2 -Cr 3 C 2 The high-temperature self-lubricating composite material of the system has a friction coefficient of 0.40 at 800°C and a wear loss of 4.8×10 -6 mm 3 / (Nm). In comparison, the high-temperature-resistant and anti-oxidation metal-based self-lubricating composite material provided by the present invention exhibits excellent comprehensive properties of high-temperature resistance, oxidation resistance and self-lubrication.

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Abstract

The invention relates to the fields of high-temperature corrosion resistance and self-lubrication, in particular to a high-temperature-resistant and oxidation-resistant metal-based self-lubricating composite material and a preparation method thereof. According to the composite material, high aluminum nickel based alloy serves as a matrix, calcium fluoride / barium fluoride co-crystals and enamel serve as a self-lubricating phase, aluminum oxide serves as a hard phase, rare earth oxides prepared from ceric oxide, yttria and the like at any ratio serve as an antioxidant, spark plasma sintering is conducted, and thus the composite material is prepared, specifically, the composite material comprises, by weight, 65-82% of high aluminum nickel based alloy, 8-15% of the self-lubricating phase, 6-15% of the aluminum oxide and 2-10% of the antioxidant, the weight percentage of the calcium fluoride / barium fluoride co-crystals is smaller than or equal to 10%, and the weight percentage of the enamel is 3-10%. Through high aluminum design of the nickel based alloy and addition of the antioxidant and the enamel serving as the novel high-temperature self-lubricating phase, the composite material integrates the properties of high-temperature resistance, oxidation resistance and excellent self-lubrication, and can be applied to part production under the oxidation-resistant, high-temperature-resistant and self-lubricating environment.

Description

Technical field: [0001] The invention relates to the field of high temperature corrosion resistance and self-lubrication, in particular to a metal-based self-lubricating composite material with high temperature resistance and oxidation resistance and a preparation method thereof. . Background technique: [0002] Friction, wear and lubrication conditions under harsh working conditions such as high temperature, high speed and high load are one of the key factors that determine the thrust-to-weight ratio and service life of space mechanical systems such as aero-engines, space vehicles, and spacecraft. Many equipment and components working under high temperature conditions require the tribological system to have a good lubrication state under extreme high temperature, such as: the working temperature of the adiabatic diesel engine is as high as 760 ℃, and the cylinder liner, piston ring and valve stem are lubricated extremely important. At present, the lubrication method for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C32/00C22C30/00C22C1/05B22F3/105
CPCB22F3/105B22F2003/1051B22F2998/10C22C1/05C22C19/058C22C30/00C22C32/00B22F2009/043
Inventor 陈明辉王群昌王福会
Owner NORTHEASTERN UNIV
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