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Titanium fire preventing flame-retardant coating and preparation method thereof

A technology of flame-retardant coating and titanium fire, which is applied in the field of titanium alloy application, can solve the problems that flame-retardant titanium alloy cannot meet the design requirements, the difficulty of manufacturing large-scale parts, and the difficulty of forming, so as to improve the interface bonding characteristics and the preparation cycle. Short, the effect of increasing the service temperature

Inactive Publication Date: 2018-05-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the maximum service temperature (550°C) of flame-retardant titanium alloy can no longer meet the design requirements; titanium-aluminum intermetallic compound alloy has become a very promising candidate key material, and the long-term service temperature is 700°C to 850°C, but Its plastic toughness is poor, forming is difficult, and it is extremely difficult to manufacture large-size parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Ti-5.8Al-4Sn-4Zr-0.7Nb-1.5Ta-0.4Si-0.06C titanium alloy substrate was coated with titanium-aluminum intermetallic compound coating by laser cladding method, and its nominal chemical composition was Ti-46Al-2Cr -5Nb-0.2Ta, the maximum power of the laser cladding equipment used is 6KW.

[0030] The spherical titanium-aluminum intermetallic compound powder with an average particle size of 53 μm was prepared by argon atomization method, and after drying, it was subjected to laser cladding. The laser power was 0.6KW, the cladding rate was 450mm / min, and the powder feeding rate was 1.8rpm, the prepared coating thickness is 0.8mm.

[0031] Then, the prepared titanium-aluminum intermetallic compound coating was subjected to stress relief annealing, wire cutting, grinding and drilling to obtain a flame retardant test sample with a size of 126mm×27mm×2.1mm (with a Φ4mm circle in the center hole). The flame retardant performance test was carried out with the friction ignition eq...

Embodiment 2

[0033] Ti-15Mo-3Al-2.7Nb-0.2Si titanium alloy substrate was coated with Ti-Al intermetallic compound coating by laser cladding method, and its nominal chemical composition was Ti-45Al-1.5Cr-2Nb-1.5Ta-0.1B . The maximum power of the laser cladding equipment used is 6KW.

[0034] The spherical titanium-aluminum intermetallic compound powder with an average particle size of 75 μm was prepared by argon atomization method. After drying, laser cladding was carried out on it. The laser power was 0.9KW, the cladding rate was 350mm / min, and the powder feeding rate was 1.5rpm, the prepared coating thickness is 1.0mm.

[0035]Then, the prepared titanium-aluminum intermetallic compound coating was subjected to stress relief annealing, wire cutting, grinding and drilling to obtain a flame retardant test sample with a size of 126mm×27mm×2.1mm (with a Φ4mm circle in the center hole). The flame retardant performance test was carried out using the friction ignition equipment of China Aerosp...

Embodiment 3

[0037] Ti-6.5Al-3.5Mo-15Zr-0.3Si titanium alloy substrate was coated with titanium-aluminum intermetallic compound coating by laser cladding method, and its nominal chemical composition was Ti-46Al-2Cr-3.5Nb-0.8Ta-0.2 For B-0.05C, the maximum power of the laser cladding equipment used is 6KW.

[0038] Spherical titanium-aluminum intermetallic compound powder with an average particle size of 116 μm was prepared by argon atomization method. After drying, laser cladding was carried out on it. The laser power was 1.2KW, the cladding rate was 400mm / min, and the powder feeding rate was 1.5rpm, the prepared coating thickness is 1.0mm.

[0039] Then, the prepared titanium-aluminum intermetallic compound coating was subjected to stress relief annealing, wire cutting, grinding and drilling to obtain a flame retardant test sample with a size of 126mm×27mm×2.1mm (with a Φ4mm circle in the center hole). The flame retardant performance test was carried out using the friction ignition equi...

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Abstract

The invention discloses a titanium fire preventing flame-retardant coating and a preparation method thereof. A laser cladding method is adopted to coat a titanium-aluminum intermetallic compound coating located on the surface of a titanium alloy matrix, and a compact Al2O3-enriched compound oxidation product can be formed on the surface after combination of the titanium-aluminum intermetallic compound coating. The preparation method includes the steps of preparation of titanium-aluminum intermetallic compound powder, drying treatment of the pre-cladded titanium-aluminum intermetallic compoundpowder, pretreatment of the titanium alloy matrix, laser cladding, heat treatment and the like. The flame-retardant property of the prepared titanium-aluminum intermetallic compound coating is improved to be more than twice that of the titanium alloy matrix, and meanwhile the combination degree of the coating and the matrix is good. Moreover, high strength of the coating is combined with high toughness of the matrix, and thus the composite structure which is tough inside and hard outside is more suitable for the service environment of aero-engines. The titanium fire preventing flame-retardantcoating is simple in preparation technology and has repeatability, the experimental cost is low and application prospects are broad.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy application, and relates to a titanium alloy surface flame-retardant technology, in particular to a titanium fire-proof flame-retardant coating and a preparation method thereof. Background technique [0002] Due to its low density, high specific strength and excellent corrosion resistance, titanium alloys are widely used in aero-engine components, such as compressor blades and casings. With the increase of thrust-to-weight ratio of aero-engines, the demand for titanium alloys will further increase. Increase. However, due to the shortcomings of titanium itself, such as poor thermal conductivity, non-dense high-temperature oxide film, and high oxidation heat and combustion heat, there are potential safety hazards in the engine due to the combustion of titanium components, that is, titanium fire. Therefore, the contradiction between the increase in demand for titanium alloy consumption and th...

Claims

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Application Information

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IPC IPC(8): C22C14/00C23C24/10
Inventor 弭光宝欧阳佩旋蔡建明黄旭李培杰
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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