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Coating structure with micropore transition layer and preparation method thereof

A transition layer and microporous technology, applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve problems such as low bonding strength and affecting coating life, achieve high specific strength and ease material performance difference, heat insulation performance and thermal shock resistance are good

Inactive Publication Date: 2010-06-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that due to the large difference in material performance between the existing coating and the substrate, and the general transition layer is difficult to eliminate the difference in the performance of the two materials, resulting in low bonding strength and affecting the life of the coating. A coating structure with a microporous transition layer capable of eliminating the performance difference between the base material and the coating material and its preparation method

Method used

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  • Coating structure with micropore transition layer and preparation method thereof
  • Coating structure with micropore transition layer and preparation method thereof
  • Coating structure with micropore transition layer and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0033] Such as figure 1 Shown.

[0034] A coating structure with a microporous transition layer, including a transition layer 2 for bonding and a high-temperature ceramic coating 3, one side of the transition layer 2 is fixedly connected to the substrate 1, and the other side of the transition layer 2 is ceramic coated The layer 3 is solidified and connected to consolidate the ceramic coating 3 on the substrate 1. The transition layer 2 is a transition layer with micropores. The lower end of the micropores is tightly combined with the substrate 1, and the upper end is penetrated And the rapidly cooled ceramic coating 3 is sealed to form a closed hole in the middle of the micropores. The part of the ceramic coating 3 that penetrates into the micropores is anchored in the micropores so that the ceramic coating 3 and the transition layer 2 The bonding strength is improved, and the closed pores alleviate the material performance difference between the substrate 1 and the ceramic coat...

Embodiment 2

[0036] A method for preparing a coating structure with a microporous transition layer, which includes the following steps:

[0037] First, clean and / or activate the substrate;

[0038] Secondly, lay the transition layer powder on the surface of the above-mentioned treated substrate so that the thickness of the laid transition layer powder is about 100 microns smaller than the thickness of the final formed ceramic coating; the transition layer powder can be any of the following One can also be selected according to the material of the coating. If necessary, a pore-forming agent can be added to it. The transition layer powder can be a multiple alloy or a multiple alloy doped with a ceramic phase (such as pure Ni powder, Mixture of Co powder, Cr powder and Al powder; pure Ti powder, Al powder and ZrO 2 The mixture of nano powders can also be pure Ni powder, Co powder, Cr powder, Al powder and Y 2 O 3 Nanopowder mixture), the pore-forming agent can be a mixture of boric acid and potass...

Embodiment 4

[0055] This embodiment is also a concrete example of the second embodiment.

[0056] Design of wear-resistant ceramic coating on TC4 alloy surface.

[0057] Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance, and good process performance, making it a very dynamic new structural material in the military and civilian fields after the 1950s. However, the shortcomings of titanium alloys such as wear resistance, fretting resistance and high temperature oxidation resistance greatly limit its application under harsh conditions such as aero engines.

[0058] (1) Use TC4 alloy as the base material, clean it with acetone and alcohol, and then sandblast it for use;

[0059] (2) Using pure Ni powder, Co powder, Cr powder, Al powder and Y 2 O 3 Nano powder (particle size 20nm), mix according to the following atomic mass ratio (47:15:16:20:2), then add 7% polystyrene (PS) to the mixed powder, mix for 50 minutes with a ball mill, and dry 1 Hours (100...

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Abstract

The invention relates to a coating structure with a micropore transition layer and a preparation method thereof, belonging to the processing field of high-temperature material; the coating is composed of a basal body, a micropore transition layer and a nano ceramic layer; the main innovation point of the method is the structural design of the transition layer, the micropore transition layer with regular shape distribution is prepared by laser, and then the surface of the micropore transition layer is melted with ceramics by the laser to form a high-temperature coating with a special structure; due to the micropores on the transition layer, the disadvantages that the interface combination strength of the ceramic coating and the metal transition layer is weak and spalling is easy are overcome, and the thermal shock resistance of the coating structure is greatly improved, the heat-conducting property is reduced, and the disadvantages of the existing high-temperature coating are recovered; the ceramic material with different materials can be prepared on the surfaces of various high temperature alloys, and the coating can be widely applied to the filed of high-temperature resistant and corrosion resisting parts.

Description

Technical field [0001] The invention relates to a coating structure and a preparation method thereof, in particular to a coating structure with a microporous transition layer and a preparation method thereof, in particular to a coating structure with a microporous transition layer and a preparation method thereof . Background technique [0002] Ceramic materials have excellent wear resistance, corrosion resistance, heat resistance, and high temperature oxidation resistance, but their brittleness, poor fatigue resistance, sensitivity to stress and cracks, and difficulty in processing have limited their applications. The metal surface ceramic coating technology can organically combine the characteristics of the base metal and the surface ceramic coating, and exert the comprehensive advantages of the two types of materials. It has become the main method of material modification today. However, due to the large difference in performance between ceramic coatings and metal substrates,...

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C4/10C23C4/12B32B18/00C23C4/06
Inventor 田宗军沈理达高雪松刘志东黄因慧汪炜
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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