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Ternary boride ceramic coating with palygorskite and preparation method thereof

A ternary boride and ceramic coating technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of density and wear resistance limitations, and achieve good friction reduction effect

Inactive Publication Date: 2014-07-30
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional ternary boride-based cermets are generally prepared as bulk materials or cladding layers are prepared by in-situ reaction on the surface of the substrate. Composite ceramics with hard phase have certain limitations in density and wear resistance

Method used

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  • Ternary boride ceramic coating with palygorskite and preparation method thereof
  • Ternary boride ceramic coating with palygorskite and preparation method thereof
  • Ternary boride ceramic coating with palygorskite and preparation method thereof

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preparation example Construction

[0038] The invention provides a ternary boride ceramic coating and a preparation method thereof. The ternary boride ceramic coating is prepared on a transition layer on a substrate, and the ternary boride ceramic coating contains Mg 3 Al 2 (SiO 4 ) 3 and MoO 2phase, there are square block crystals and rectangular strip crystals in the coating, and the square crystals and rectangular strip crystals are uniformly dispersed in the binder phase. The square block crystal is mainly the target phase of spraying——Mo 2 FeB 2 Cemented carbide phase, rectangular strip crystals containing Mo 2 FeB 2 Cemented carbide phase, and contains magnesium aluminum silicate - Mg 3 Al 2 (SiO 4 ) 3 . The porosity of the coating is 10.71%-15.66%, which is lower than that of the coating without palygorskite. The bonding strength of the coating is between 16.68 and 17.48 MPa, which is increased relative to the bonding strength of the coating before adding palygorskite. The microhardness valu...

Embodiment 1

[0077] The preparation method provided by the present invention is adopted to prepare a ternary boride ceramic coating, and the mass fraction of palygorskite is 2%, and the specific preparation method is as follows:

[0078] The first step, raw material preparation:

[0079] The matrix material is selected as ordinary Q235-A steel, and the aggregates are sprayed: Mo powder, micron carbonyl Fe powder, and FeB alloy powder are selected as the sprayed aggregate components. The average particle size of the Mo powder is 44.74 μm, and the bulk density is 7.15. g / cm 3 , The purity of molybdenum powder is greater than 99.95%. The average particle size of micron carbonyl Fe is 4.95μm, and the bulk density is 2.66g / cm 3 , the purity is greater than 99.5%. The average particle size of FeB alloy powder is 6.47μm, and the bulk density is 5.29g / cm 3 . The raw material of the transition layer is nickel-clad aluminum powder in Ni-Al alloy powder.

[0080] The second step is the preparat...

Embodiment 2

[0091] The first step, raw material preparation:

[0092] The base material is ordinary Q235-A steel. Mo powder, micron carbonyl Fe powder, and FeB alloy powder are selected as spray aggregate components. The average particle size of the Mo powder is 43 μm, and the bulk density is 6.5 g / cm 3 , The purity of molybdenum powder is greater than 99.95%. The average particle size of micron carbonyl Fe is 4μm, and the bulk density is 2g / cm 3 , the purity is greater than 99.5%. The average particle size of FeB alloy powder is 6μm, and the bulk density is 5g / cm 3 . The nickel-clad aluminum powder in the Ni-Al alloy powder is selected to spray the transition layer on the substrate.

[0093] The second step to the fourth step are the same as in Example 1, and the mass percentage of palygorskite added during the preparation of the spray powder is 1%.

[0094] The fifth step is preheating, the preheating temperature is 400°C, and the preheating time is 7 minutes.

[0095] The sprayi...

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Abstract

The invention discloses a ternary boride ceramic coating with palygorskite and a preparation method thereof, belonging to the technical field of ceramic coating. The preparation method comprises the following steps of: adopting Mo-Fe-B as a reaction system, taking palygorskite with different proportions in an aggregate as an additive, adopting a flame spraying technology, and spraying the ternary boride ceramic coating with palygorskite on the surface of a steel matrix which is subjected to surface pretreatment. The bonding performance between the coating and the matrix is better, the bonding strength can reach 17.48 MPa, and the phenomena of warping and cracking can be prevented under 75 times of thermal shock. The porosity of the coating is 10.71%-15.66%, the coating bonding strength ranges from 16.6 MPa to 17.48 MPa, and the coating micro-hardness value is 1422.48 HV0.1.

Description

technical field [0001] The invention belongs to the technical field of ceramic coatings, in particular to a ternary boride ceramic coating and a preparation method thereof. Background technique [0002] Boride is an interstitial phase compound. A variety of complex covalent bonds can be formed between B atoms and B atoms, and B forms ionic bonds with many metal atoms. Most borides contain M-M metallic bonds, B-B covalent bonds and B-M ionic bonds. These physical and chemical characteristics of boride determine that it has high melting point, high hardness, high wear resistance and high corrosion resistance. where TiB 2 The representative binary boride has excellent wear resistance, corrosion resistance and outstanding physical properties. It has been used in actual production in some fields, but its sintering performance is poor. During high temperature sintering, boride grains are easy to agglomerate. The sintered body is brittle, and it is easy to react with the matrix ...

Claims

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Application Information

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