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Micropore and microcrack composite toughening millimeter thick ceramic coating and preparation method

A ceramic coating and micro-crack technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of limiting the performance improvement of ceramic coating, large size of holes and cracks, and low particle flying speed. Achieve the effect of comprehensive mechanical properties and industrial application range improvement, large brittleness, and inhibition of crack growth behavior

Active Publication Date: 2022-08-05
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 toughening millimeter thick ceramic coating and preparation method
  • Micropore and microcrack composite toughening millimeter thick ceramic coating and preparation method
  • Micropore and microcrack composite toughening millimeter thick ceramic coating and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, the GH4169 nickel-based superalloy is used as the matrix, the size is Φ25.4×10mm, and the mass percentage includes: ≤0.08%C, 17%Cr, 55%Ni, 1.0%Co, 2.8%Mo, 0.6%Al , 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 of preparing micropore and microcrack composite toughening millimeter-thick ceramic coating by high-energy plasma spraying technology are as follows:

[0045] 1) Substrate surface pretreatment

[0046] The surface of the alloy disc is first degreasing, decontaminating, grinding and derusting, then ultrasonically cleaned with acetone, dried in a drying box after cleaning, and finally sandblasted with white corundum (#24), which is rough after sandblasting Degree Ra=10.6 μm.

[0047] 2) The sandblasted substrate is preheated by spray gun preheating, and the temperature is controlled at 180-...

Embodiment 2

[0052] In this embodiment, 2Cr13 martensitic stainless steel is used as the matrix, the size is Φ43×5mm, and the mass percentage includes: 0.25%C, ≤1.0%Si, ≤1.0%Mn, ≤0.035%P, ≤0.03%S, ≤0.6 %Ni, 14%Cr and the balance are 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 of preparing micropore and microcrack composite toughening millimeter-thick ceramic coating by high-energy plasma spraying technology are as follows:

[0055] 1) Substrate surface pretreatment

[0056] The surface of the stainless steel disc as the base material is first degreasing, decontaminating, grinding and derusting, then ultrasonically cleaned with acetone, dried in a drying box after cleaning, and finally sandblasted with white corundum (#24). The roughness after sanding is Ra=11.6 μm.

[0057] 2) The sandblasted substrate is preheated by spray gun preheating, and the tempe...

Embodiment 3

[0063] In this embodiment, 2Cr13 martensitic stainless steel is used as the matrix, the size is Φ43×5mm, and the mass percentage includes: 0.25%C, ≤1.0%Si, ≤1.0%Mn, ≤0.035%P, ≤0.03%S, ≤0.6 %Ni, 14%Cr and the balance are 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 of preparing micropore and microcrack composite toughening millimeter-thick ceramic coating by high-energy plasma spraying technology are as follows:

[0066] 1) Substrate surface pretreatment

[0067] The surface of the stainless steel disc as the base material is first degreasing, decontaminating, grinding and derusting, then ultrasonically cleaned with acetone, dried in a drying box after cleaning, and finally sandblasted with white corundum (#24). The roughness after sanding is Ra=11.6 μm.

[0068] 2) The sandblasted substrate is preheated by spray gun preheating, and the temperature is controll...

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Abstract

The invention relates to a micropore and microcrack composite toughening millimeter-thick ceramic coating and a preparation method. 1) Using high-energy plasma spraying technology, oxide ceramic powder is deposited on the surface of a preheated substrate to form a layer of coating 2) Repeat step 1) several times until the thickness of the coating is greater than 1.5mm, to obtain a composite toughened millimeter-thick ceramic coating with micropores and microcracks. Near sub-micron pores and micro-cracks are dispersed in the coating, which effectively reduces the energy release rate at the crack tip during the crack propagation process and greatly improves the fracture toughness of the coating. The high fracture toughness also reduces the internal stress accumulation during the coating deposition process, and realizes the effective deposition of high toughness and ultra-thick ceramic coatings, which greatly satisfies the stability of ceramic coatings in high temperature and heavy duty applications.

Description

technical field [0001] The invention belongs to the field of metal surface modification, and in particular relates to a micropore and microcrack composite toughening millimeter-thick ceramic coating and a preparation method. Background technique [0002] In major equipment of strategic significance such as aero-engines and gas turbines, ceramic coatings with high temperature resistance, corrosion resistance, wear resistance and excellent thermal insulation have been fully recognized and promoted. However, the high brittleness and poor plastic 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 an industry problem. [0003] After years of research, the toughening methods of ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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