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Micropore and microcrack composite toughened millimeter-scale thick ceramic coating and preparation method thereof

A ceramic coating and micro-crack technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of limiting the performance improvement of ceramic coatings, large holes and cracks, and low particle flying speed. Achieve the effects of comprehensive mechanical properties and industrial application range improvement, high brittleness, and inhibition of crack propagation behavior

Active Publication Date: 2021-07-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plasma spraying technology cannot fly at a low particle speed, and cannot refine the flying droplets through high-speed shearing, resulting in excessively large holes and cracks in the multi-layered coating, which greatly limits the performance improvement and promotion of ceramic coatings.

Method used

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  • Micropore and microcrack composite toughened millimeter-scale thick ceramic coating and preparation method thereof
  • Micropore and microcrack composite toughened millimeter-scale thick ceramic coating and preparation method thereof
  • Micropore and microcrack composite toughened millimeter-scale thick ceramic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, GH4169 nickel-based superalloy is used as the substrate, the size is Φ25.4×10mm, and it includes: ≤0.08%C, 17%Cr, 55%Ni, 1.0%Co, 2.8%Mo, 0.6%Al in terms of mass percentage , 0.75% Ti and the balance Fe.

[0043] The oxide ceramic powder is zirconia powder, and the particle size of the oxide ceramic powder is in the range of 10-90 μm.

[0044] The specific implementation steps for preparing micropores and microcracks composite toughened millimeter-scale thick ceramic coatings by using high-energy plasma spraying technology are as follows:

[0045] 1) Substrate surface pretreatment

[0046] The surface of the alloy disc is first degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone, dried in a drying oven after cleaning, and finally sandblasted with white corundum (#24). After sandblasting, it is rough Degree Ra = 10.6 μm.

[0047] 2) The sandblasting base material is preheated by means of spray gun preheating, and ...

Embodiment 2

[0052] In this embodiment, 2Cr13 martensitic stainless steel is used as the matrix, the size is Φ43×5mm, and it includes: 0.25%C, ≤1.0%Si, ≤1.0%Mn, ≤0.035%P, ≤0.03%S, ≤0.6 %Ni, 14%Cr and the balance is Fe.

[0053] The oxide ceramic powder is zirconia powder, and the particle size of the oxide ceramic powder is in the range of 10-90 μm.

[0054] The specific implementation steps for preparing micropores and microcracks composite toughened millimeter-scale thick ceramic coatings by using high-energy plasma spraying technology are as follows:

[0055] 1) Substrate surface pretreatment

[0056] The surface of the stainless steel wafer as the base material is first degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone, placed in a drying oven to dry after cleaning, and finally sandblasted with white corundum (#24). The roughness after sanding is Ra=11.6μm.

[0057] 2) The sandblasting base material is preheated by means of spray gun preheati...

Embodiment 3

[0063] In this embodiment, 2Cr13 martensitic stainless steel is used as the matrix, the size is Φ43×5mm, and it includes: 0.25%C, ≤1.0%Si, ≤1.0%Mn, ≤0.035%P, ≤0.03%S, ≤0.6 %Ni, 14%Cr and the balance is Fe.

[0064] The coating material is zirconia powder, and the particle size of the powder is in the range of 10-90 μm.

[0065] The specific implementation steps for preparing micropores and microcracks composite toughened millimeter-scale thick ceramic coatings by using high-energy plasma spraying technology are as follows:

[0066] 1) Substrate surface pretreatment

[0067] The surface of the stainless steel wafer as the base material is first degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone, placed in a drying oven to dry after cleaning, and finally sandblasted with white corundum (#24). The roughness after sanding is Ra=11.6μm.

[0068] 2) The sandblasting base material is preheated by means of spray gun preheating, and the temper...

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Abstract

The invention relates to a micropore and microcrack composite toughened millimeter-scale thick ceramic coating and a preparation method thereof. The preparation method comprises the steps that 1, depositing oxide ceramic powder on the surface of a preheated base material through a high-energy plasma meltallizing technology to form a coating, and then cooling the coating to 250 DEG C to 270 DEG C; and (2) repeating the step (1) for multiple times until the thickness of the coating is greater than 1.5 mm, and obtaining the micropore and microcrack composite toughened millimeter-scale thick ceramic coating. Near-submicron pores and micro-cracks are dispersed and distributed in the coating, so that the energy release rate of a crack tip is effectively reduced in the crack growth process, and the fracture toughness of the coating is greatly improved. Due to high fracture toughness, internal stress accumulation in the coating deposition process is reduced, effective deposition of the high-toughness and ultra-thick ceramic coating is achieved, and the use stability of the ceramic coating in the high-temperature and heavy-load field is greatly met.

Description

technical field [0001] The invention belongs to the field of metal surface modification, and in particular relates to a composite toughened millimeter-level thick ceramic coating of micropores and microcracks and a preparation method thereof. Background technique [0002] In major strategic equipment such as aero engines and gas turbines, ceramic coatings with high temperature resistance, corrosion resistance, wear resistance and excellent heat insulation have been fully recognized and promoted. However, the high brittleness and poor plasticity and toughness make the ceramic coating unable to adapt to the complex working conditions of higher impact force and high temperature, which also greatly limits its application in major equipment, and even affects the upgrading of these equipment. Therefore, how to ensure that the ceramic coating has both "high plastic toughness and high hardness" has become a difficult problem in the industry. [0003] After years of research, the to...

Claims

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Application Information

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IPC IPC(8): C23C4/11C23C4/134
CPCC23C4/11C23C4/134
Inventor 白宇柳琪种南京王龙飞黄树和
Owner XI AN JIAOTONG UNIV
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