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Preparation method of nitride-oxide composite porous ceramic coating

A technology of porous ceramics and composite coatings, which is applied in coatings, metal material coating processes, molten spraying, etc., and can solve the limitations of the mixing degree of multi-phase coating components, poor interlayer bonding strength, and coating bonding strength. low cost, convenient operation and uniform coating composition

Inactive Publication Date: 2015-06-10
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Micro-arc oxidation (Xingling Shi, LingLi Xu, QingLiang Wang, Porous TiO 2 film prepared by micro-arc oxidation and its electrochemical behaviors in Hank's solution, Surface and Coatings Technology, Volume 205, Issue 6, 2010, Pages 1730-1735.) technology can form a layer of porous oxide ceramics on the surface of metal or alloy Thin film, evenly distributed pores, can improve the corrosion resistance of the alloy, but the film thickness is thin
The bonding strength of the suspension plasma sprayed coating is poor. Since the suspension enters the spray gun, the suspended particles are generally in a semi-molten state, resulting in poor bonding strength between layers, and the composition and properties of the multi-phase coating are affected by the degree of mixing before spraying. limits

Method used

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  • Preparation method of nitride-oxide composite porous ceramic coating
  • Preparation method of nitride-oxide composite porous ceramic coating
  • Preparation method of nitride-oxide composite porous ceramic coating

Examples

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Embodiment 1

[0044] Embodiment 1 (illustrates, and present embodiment is specifically same raw material, 3 embodiments of different proportioning, and labeling like this is for ease of comparison at present. The structure of embodiment 2-6 is the same as this)

[0045] In this example, TiH is used as the pore-forming agent, TiH powder of -300~+400 and Ti powder of -200~+400 are selected to prepare mixed powder for spraying, and the mass ratio of Ti powder and pore-forming agent is 2:1 respectively; 1:1; 2:3.

[0046] Its main steps include: substrate sand blasting treatment → sending arc starting ion gas → power supply to spraying equipment → plasma spray gun arc starting → sending metal self-fluxing alloy powder for spraying into the plasma flow to spray the surface of the workpiece to form an alloy bottom layer → sending The mixed powder of metal powder and pore-forming agent enters the flame flow and is sprayed on the alloy bottom layer to form a porous nitride-oxide composite coating. ...

Embodiment 1-1

[0048] The first step, the configuration of raw materials

[0049] Weigh -200~+400 mesh Ti powder and -300~+400 mesh TiH powder and mix them in different proportions. The mass ratio of Ti:TiH mixed is 2:1; the mixed powder is mixed in a ball mill for 2 hours and set aside.

[0050] The second step, the preparation of the porous coating

[0051] (1) Spray corundum sand to treat the surface of ordinary steel with carbon content of 0.05-0.22wt%, exposing the fresh surface;

[0052] (2) Power transmission of spraying equipment→supply of plasma gas→arcing of spray gun;

[0053] (3) Feed powder into the plasma flame, spray Ni-Al self-fluxing alloy powder (commercially available), and prepare a bonding bottom layer of 40-60 μm porous coating;

[0054] (4) Spray the mixed powder prepared in the first step to prepare a 500 μm porous nitride-oxide composite coating. The spraying process parameters are shown in Table 1.

[0055] The spraying process parameter of table 1 embodiment 1 ...

Embodiment 1-2

[0060] Example 1-2 TiH is used as the pore-forming agent, TiH powder of -300 ~ +400 mesh and Ti powder of -200 ~ +400 mesh are selected to prepare mixed powder for spraying, and the mass ratio of Ti powder to pore-forming agent is changed from 2:1 Change to 1:1, other parameters, preparation process and preparation process are the same as in Example 1-1. In this embodiment, the coating thickness is 486 μm.

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Abstract

The invention provides a preparation method of a nitride-oxide composite porous ceramic coating. The method comprises the steps of firstly, evenly mixing a metal powder with a pore-forming agent for later user, and secondly, preparing a porous coating, namely spraying twice onto the surface of a substrate by use of a plasma spraying method, wherein the pore-forming agent is TiH, NaCl or activated carbon; the porous coating is specifically prepared by use of the steps of (1) spraying Ni-Al, CoCrAlY or NiCrAlY self-fluxing alloy powder to form an alloy base layer of the porous coating, and (2) spraying the mixed powder of the metal powder and the pore-forming agent mixed in the first step, thereby obtaining the nitride-oxide composite porous ceramic coating, wherein the base layer is 50-80 microns thick. According to the preparation method, the pores in the coating are controlled by controlling the proportion of the pore-forming agent; the nitride-oxide composite porous ceramic coating high in melting point (the melting point of TiN is 2950 DEG C) and having a network structure can be prepared effectively, and the maximum porosity of the coating can be 38%.

Description

technical field [0001] The invention belongs to thermal spraying on the surface of metal materials, in particular to a reactive plasma spraying nitride-oxide composite porous ceramic coating and a preparation method thereof. Background technique [0002] Due to its wide application and fascinating development prospects, porous materials have paid great attention to it in the scientific and industrial circles. Porous ceramics are ceramic bodies containing a large number of open pores. Porous ceramics have been gradually used in metallurgy, Chemical industry, environmental protection, energy, biology and other departments. Many countries have invested a lot of manpower and material resources in research in this area. my country is also paying more and more attention to the research and application of porous ceramics. Porous ceramic coatings are widely used in fuel cells, biomedical material surfaces, photocatalysis, water treatment, etc., because their porous structure can p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/08C23C4/06C23C4/073C23C4/10C23C4/134
Inventor 董艳春陈学广刘哲杨勇褚振华张建新阎殿然何继宁
Owner HEBEI UNIV OF TECH
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