Wide-temperature-range self-lubricating coat material and its preparation method

A self-lubricating coating and coating material technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of poor coating bonding, easy falling off, unstable friction coefficient, etc., to reduce wear , improve the uniformity of distribution, and the effect of good anti-friction effect

Inactive Publication Date: 2013-05-01
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-lubricating coating always has problems such as easy falling off of lubricating components and unstable anti-friction effect during use. Especially in the initial stage of use, the friction coefficient is unstable, and the friction coefficient is greater than 0.4, which is easy to cause wear on the abrasive parts in the early stage.
The main reason is that the lubricating components are unevenly dispersed at the beginning of friction, and a continuous self-lubricating film layer cannot be formed on the surface; the internal bonding of the coating is poor, and it is easy to fall off during processing and friction, and the bonding strength is generally less than 30 MPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Select 100 g each of Mo powder with an average particle size of about 5 μm and Al powder with an average particle size of 2 μm, and mix them uniformly by ball milling to obtain a mixed powder of Mo powder and Al powder;

[0018] 800 g of Ni powder with an average particle size of 50 μm was selected as the core, and the mixed powder of Mo powder and Al powder was coated on the surface of Ni powder by the method of adhesive agglomeration, and dried.

[0019] Spherical Cr with particle size less than or equal to 30 μm in 125 g 2 o 3 is a hard phase;

[0020] Ag and CaF with particle size less than or equal to 30 μm 2 · BaF 2 is the lubricating phase, the mass of Ag is 60 g, CaF 2 · BaF 2 The mass of is 65 g;

[0021] Mix the above powders evenly to obtain a self-lubricating coating material in a wide temperature range. The self-lubricating coating is obtained after plasma spraying. The friction coefficient at the initial stage of the coating can be stabilized betwe...

Embodiment 2

[0023] Select 30 g each of Mo powder with an average particle size of 3 μm and Al powder with an average particle size of 1 μm, and mix them uniformly by ball milling to obtain a mixed powder of Mo powder and Al powder;

[0024] 540 g of Ni powder with an average particle size of 50 μm was selected as the core, and the mixed powder of Mo powder and Al powder was coated on the surface of Ni powder by the method of adhesive agglomeration, and then dried.

[0025] Spherical Cr with particle size less than or equal to 20 μm in 200 g 2 o 3 is a hard phase;

[0026] Ag and CaF with particle size less than or equal to 40 μm 2 · BaF 2 is the lubricating phase, the mass of Ag is 100 g, CaF 2 · BaF 2 The mass of is 100 g;

[0027] Mix the above powders evenly to obtain a self-lubricating coating material in a wide temperature range. The self-lubricating coating is obtained after plasma spraying. The friction coefficient at the initial stage of the coating can be stabilized betwe...

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Abstract

The invention belongs to the technical field of thermal spraying, and especially relates to a wide-temperature-range self-lubricating coat material and its preparation method. The coat material is a uniform mixture material composed of a bonding phase, a hard phase and a lubrication phase. The wide-temperature-range self-lubricating coat material is prepared through mixing coated NiMoAl used as the bonding phase, spherical Cr3C2 or Cr2O3 used as a wear resistant phase which is the hard phase, and Ag and CaF2.BaF2 used as the lubrication phase. Polymerized NiMoAl undergoes a reaction in the spray process and promotes the bonding of a coat, and the simple substance state of a part of metallic Mo in NiMoAl is reserved after the spraying, so the friction reduction effect is realized, the lubrication component distribution uniformity is improved, and it is helpful for the rapid formation of a self-lubricating coat in the initial friction stage. Simultaneously the adoption of the spherical hard phase can reduce the wear of a friction mating plate by the hard phase. After the adoption of the wide-temperature-range self-lubricating coat material, the initial-stage friction coefficient stably decreases to below 0.2 from 0.4, and the bonding strength increases to above 40MPa from below 30MPa.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, in particular to a wide temperature range self-lubricating coating material and a preparation method thereof. Background technique [0002] The development of modern industry has prompted more and more machinery to work in harsh environments such as high temperature and high speed. Especially in the development of aerospace and other industries, machinery is faced with special environments such as vacuum, high and low temperature differences, etc. Ordinary lubricants are difficult to meet the requirements of use. Solid self-lubricating coatings have attracted widespread attention because of their stable anti-friction effects and their suitability for harsh working conditions. Solid self-lubricating coatings generally consist of a binder phase, a wear-resistant phase and a lubricating phase. At present, the main components of the relatively mature wide temperature range self-lubricating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04
Inventor 于月光任先京高峰沈婕赵晓东袁建鹏徐红艳
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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