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Ternary boride ceramic coating with cerium oxide and preparation method thereof

A ternary boride, ceramic coating technology, applied in coating, metal material coating process, fusion spraying and other directions, can solve the problems of high friction factor, inability to form boundary film, low density, etc.

Inactive Publication Date: 2012-10-03
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ternary boride-based cermets have the characteristics of high hardness, high strength, low density and high stiffness, as well as excellent chemical stability and high-temperature mechanical properties, but their friction coefficients are generally relatively high, generally between 0.7 and 0.8, It is difficult to achieve the purpose of oil-free self-lubrication
And the traditional lubrication method has the following disadvantages: 1) The additives in the lubricant do not interact with the ceramic surface, so a boundary film that can fully contact cannot be formed; 2) The viscosity of the existing lubricant decreases exponentially with the increase of temperature , easy to cause direct contact with asperities; 3) performance attenuation of liquid lubricants is prone to occur at high temperatures

Method used

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  • Ternary boride ceramic coating with cerium oxide and preparation method thereof
  • Ternary boride ceramic coating with cerium oxide and preparation method thereof
  • Ternary boride ceramic coating with cerium oxide and preparation method thereof

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preparation example Construction

[0022] The invention provides a method for preparing a ternary boride ceramic coating containing cerium oxide, the process flow is as follows figure 1 As shown, it mainly includes three parts: substrate sample pretreatment, spray feeding preparation and ceramic coating preparation, as follows:

[0023] The first step, substrate pretreatment:

[0024] (1) Surface roughening of the sample:

[0025] The base material is Q235 steel plate, and the chemical composition is shown in Table 1:

[0026] Table 1Q235-A steel plate chemical composition (wt.%)

[0027]

[0028] The Q235 steel plate with a thickness of 6mm is cut into a sample with an area of ​​25mm×25mm by wire cutting, and the surface is sandblasted to remove the surface scale, so that the surface of the sample is activated and roughened, so as to increase the contact area between the workpiece and the sprayed layer , and the coarsening of the coating can change the residual stress of the coating, which is conducive t...

Embodiment 1

[0043] The preparation method provided by the invention is used to prepare a ternary boride ceramic coating containing cerium oxide, and 1% by mass of cerium oxide is added to the spray powder. The steps of the preparation method are as follows:

[0044] The first step, substrate pretreatment:

[0045] The surface of the substrate is roughened, and then a Ni-Al transition layer is prepared on it.

[0046] The substrate is made of Q235 steel plate, and the surface is roughened by sandblasting. The sandblasting process parameters are as follows: the sandblasting abrasive grain is 20 mesh corundum sand, the spraying distance is 150mm, the sandblasting angle is 90°, and the compressed air pressure is 0.8MPa.

[0047] Before preparing the transition layer, the substrate can be preheated, the preheating temperature is 300° C., and the preheating time is 7 minutes. Nickel-coated aluminum powder is used for the preparation of the transition layer.

[0048] The second step, the prepa...

Embodiment 2

[0054] The ternary boride ceramic coating containing cerium oxide is prepared by the preparation method provided by the invention, and 2% cerium oxide is added in the spray powder, and the steps of the preparation method are as follows:

[0055] The first step, substrate pretreatment:

[0056] The surface of the base Q235 steel is roughened, and then a Ni-Al transition layer is prepared on it.

[0057] The surface roughening of the base body adopts sandblasting method, and the sandblasting process parameters are as follows: the sandblasting abrasive grain is 20 mesh corundum sand, the spraying distance is 100mm, the sandblasting angle is 90°, and the compressed air pressure is 0.6MPa.

[0058] Before preparing the transition layer, the substrate can be preheated, the preheating temperature is 400° C., and the preheating time is 5 minutes.

[0059] The second step, the preparation of spray feed:

[0060] Select 32g, 48g, and 20g of Mo powder, FeB alloy powder, and Fe powder, ...

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Abstract

The invention discloses a ternary boride ceramic coating with cerium oxide and a preparation method thereof, belonging to the technical field of coating preparation. The preparation method comprises the following steps of: adopting a thermal spraying technology, taking Mo powder, Fe powder and FeB powder as raw materials, and preparing the Mo2FeB2 ternary boride ceramic coating on a Q235 steel matrix; and adding CeO2 powder with a friction reducing effect on the ternary boride ceramic coating, and preparing the Mo2FeB2 ternary boride ceramic coating with CeO2 components by using the same technology. In comparison with the Q235 matrix, the abrasive wear resistance of the ternary boride ceramic coating disclosed by the invention is improved by 50%, and the adhesive wear resistance of the ternary boride ceramic coating is improved by 59%, so that the ternary boride ceramic coating has an excellent abrasion resistance and a higher friction coefficient ranging from 0.31 to 0.52.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, in particular to a ternary boride ceramic coating containing cerium oxide. Background technique [0002] Currently, ternary borides (Mo 2 FeB 2 ) The preparation methods of ceramic coatings mainly focus on vacuum liquid phase sintering method and in-situ reaction synthesis method, but there are certain deficiencies in the preparation process. At present, there are few domestic studies on ternary boride ceramic coatings, and the research on self-lubricating ternary boride ceramic coatings has not been reported. Rare earth elements have unique physical and chemical properties, and have made great achievements in the application of lubricating materials. Rare earth elements also have many special properties that are not known by people, especially the mechanism of action of their compounds needs to be explored. Adding it to ternary boride ceramic coatings and expecting to obtain terna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/12C23C4/06C23C4/129
Inventor 董世知马壮李智超
Owner LIAONING TECHNICAL UNIVERSITY
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