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A Technology of Using Ceramic Material to Seal Pores of Thermal Spraying Ceramic Coating

A technology of ceramic coating and ceramic materials, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of maintenance, frequent replacement, sealing failure, large pores and poor sealing, and reduce the use of and maintenance costs, moderate thermal expansion coefficient, long-term pore sealing effect

Active Publication Date: 2020-03-17
WUHAN HGLASER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are some defects in the above three sealing methods in different degrees. The automatic filling of pores by water mill and vacuum adsorption cannot completely seal the pores of the coating. The pores leak into the metal substrate, causing corrosion to the metal substrate, resulting in the entire metal-based ceramic component being scrapped before reaching its service life
Vacuum adsorption of single-layer or multi-layer coatings is used to seal holes and there is capillary phenomenon. For micro-pores, under the action of capillary and surface tension, the coating can only cover the openings of micro-pores. During the use of ceramic parts , the wear resistance of the coating is poor, and the coating covering the hole is quickly consumed under the action of abrasion, thus exposing the pores of the ceramic coating to the outside, resulting in the failure of the sealing hole
[0006] As mentioned above, the pore sealing of several current ceramic coatings cannot completely isolate the contact between the oxygen-enriched medium and the metal substrate, resulting in the failure of the service life of the metal-based ceramic functional parts and premature scrapping, resulting in frequent maintenance and replacement. economic burden

Method used

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  • A Technology of Using Ceramic Material to Seal Pores of Thermal Spraying Ceramic Coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: No. 45 steel surface is thermally sprayed with Al 2 o 3 Ceramic coating sealing process

[0031] Preparation of Al on the surface of No. 45 steel by thermal spraying process 2 o 3 After ceramic coating, uncoated Al 2 o 3 The powder remains on the surface of the ceramic coating, causing Al 2 o 3 The porosity of the ceramic coating is too small or the problem of false sealing. The process of using ceramic materials to seal the pores of thermal sprayed ceramic coatings is:

[0032] First, the Al 2 o 3 The remaining ceramic powder on the surface of the ceramic coating is removed, exposing Al 2 o 3 porosity of the ceramic coating;

[0033] Second, the Al 2 o 3 Put the ceramic parts into the vacuum furnace, and use the mechanical pump, Roots pump-double pump mode to evacuate, keep the vacuum degree in the vacuum furnace at about 1Pa, control the vacuum time at about 15min, and remove Al as much as possible. 2 o 3 The air in the pores of the ceram...

Embodiment 2

[0037] Embodiment 2: GCr15 surface AT ceramic coating sealing process

[0038] After preparing AT ceramic coating (alumina and titanium oxide mixed material, the weight ratio is 4:6, the coating prepared after spraying is alumina titanium ceramic coating) on ​​GCr15 substrate by thermal spraying process, no coating is formed. layer of Al 2 o 3 / TiO 2 The powder remains on the surface of the AT ceramic coating, causing problems such as too small porosity or false sealing of the AT ceramic coating. The process of using ceramic materials to seal the pores of thermal sprayed ceramic coatings is:

[0039] First, use an industrial vacuum cleaner to remove the remaining ceramic powder on the surface of the AT ceramic coating, exposing the pores of the AT ceramic coating;

[0040] Secondly, put the AT ceramic parts into the vacuum furnace, use the mode of mechanical pump, Roots pump-double pump to evacuate, keep the vacuum degree in the vacuum furnace at about 0.05Pa, and the vacu...

Embodiment 3

[0044] Example 3: TiO on the surface of Q235 steel 2 Ceramic coating sealing process

[0045] Preparation of TiO on Q235 substrate by thermal spraying process 2 After ceramic coating, the uncoated ceramic powder remains on the TiO 2 ceramic coating surface, resulting in TiO 2 The porosity of the ceramic coating is too small or the problem of false sealing. The process of using ceramic materials to seal the pores of thermal sprayed ceramic coatings is:

[0046] First, the TiO 2 The remaining ceramic powder on the surface of the ceramic coating is removed, exposing TiO 2 porosity of the ceramic coating;

[0047] Second, the TiO 2 Put the ceramic parts into the vacuum furnace, and use the mechanical pump, Roots pump-double pump mode to evacuate, keep the vacuum degree in the vacuum furnace at about 3Pa, and the vacuum time is 30min to remove TiO as much as possible 2 The air in the pores of the ceramic coating makes the pores in an ultra-low negative pressure state;

[0...

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Abstract

The invention discloses a technique for sealing pores of a thermal sprayed ceramic coating by using a ceramic material, which comprises the following steps: removing residual ceramic powder on the surface of the ceramic coating of a metal base ceramic part to be processed and putting it into a vacuum furnace for vacuuming; Under the condition of high temperature, ceramic powder is coated on the surface of the ceramic coating; the vacuum furnace is slowly inflated to atmospheric pressure, and under the action of negative pressure adsorption in the pores, the ceramic powder fills most of the pores in the ceramic coating; The ceramic powder in the layer is clad to form a glass dense layer on the surface of the ceramic coating. The present invention uses an industrial vacuum cleaner to absorb residual powder on the surface of the ceramic coating, completes the sealing of the ceramic coating by means of vacuum adsorption, and forms a layer of dense, uniform and smooth glass on the surface of the ceramic coating in the form of laser cladding ceramic powder. The method of glaze improves the pore sealing performance of the thermal sprayed ceramic coating, improves the service life of the metal-based ceramic functional parts, and reduces the use and maintenance costs.

Description

technical field [0001] The invention relates to the technical field of pore sealing of thermally sprayed ceramic coatings in metal-based ceramic parts, in particular to a process for sealing pores of thermally sprayed ceramic coatings by using ceramic materials. Background technique [0002] Ceramic materials have ionic bond and covalent bond structure, high bond energy, strong interatomic bonding, low surface free energy, small interatomic distance, dense packing, and no free electron movement. These characteristics endow ceramic materials with distinctive features such as high melting point, high hardness, high stiffness, high chemical stability, high insulation and heat insulation capabilities, low thermal conductivity, small thermal expansion coefficient, small friction coefficient, and no ductility. Thermal spraying technology, especially plasma spraying technology, is used to prepare ceramic coatings on metal substrates, which can organically combine the characteristic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/18C23C24/02C23C24/10
CPCC23C4/18C23C24/02C23C24/103
Inventor 王建刚刘勇林家宝王雪辉刘政
Owner WUHAN HGLASER ENG CO LTD