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Plasma arc cladding wear-resistant and corrosion-resistant coating on titanium alloy surface and preparation method thereof

A technology of plasma arc and titanium alloy, which is applied in metal material coating process, coating, fusion spraying, etc., can solve problems that have not been studied, and achieve the goals of improving fluidity, avoiding burning loss, preventing oxidation and nitriding Effect

Inactive Publication Date: 2019-09-13
邓相宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It forms a metallurgically bonded coating on the surface of the substrate by adding cladding materials on the surface of the substrate and using a high-energy-density plasma arc to fuse it together with the thin layer on the surface of the substrate, and meets specific properties such as resistance The coating required for wear and corrosion resistance can achieve the purpose of material surface modification or repair, but plasma cladding has not been studied in titanium alloy substrates.

Method used

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  • Plasma arc cladding wear-resistant and corrosion-resistant coating on titanium alloy surface and preparation method thereof
  • Plasma arc cladding wear-resistant and corrosion-resistant coating on titanium alloy surface and preparation method thereof
  • Plasma arc cladding wear-resistant and corrosion-resistant coating on titanium alloy surface and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Pretreatment of the surface of the titanium alloy substrate to be clad: removing the oxide film on the surface of the titanium alloy substrate TC4 alloy;

[0047] 2) Cladding material preparation: a certain mass ratio of Ni, Cr, Si, B, C, CaF 2 , ferro-titanium powder mixed uniformly; then the cladding powder is vacuum-dried, the mass percentage of each component in the mixed powder is: powder proportioning (mass ratio): Cr 15%, Si 1.5%, B 2 %, C 0.3%, CaF 2 5%, titanium iron 0, nickel 76.2%, powder particle size 40um. 3) Plasma arc cladding: Fix the titanium alloy substrate on the plasma arc cladding equipment, and the plasma arc cladding the titanium alloy substrate by means of coaxial powder feeding. The process parameters of plasma arc cladding are: during the welding process, the torch is used to swing, the scanning width is 4mm, the swing range is 8mm on the left and right; the swing speed is 30mm / s, the working current is 110A, the tungsten electrode diamet...

Embodiment 2

[0050] 1) Pretreatment of the surface of the titanium alloy substrate to be clad: removing the oxide film on the surface of the titanium alloy substrate TC4 alloy;

[0051] 2) Cladding material preparation: mix Ni, Cr, Si, B, C, CaF, ferro-titanium powder in a certain mass ratio; The mass percentage is: powder ratio (mass ratio): Cr 10%, Si 3%, B 1%, C1%, CaF 2 10%, titanium iron 5%, nickel 70%, powder particle size 80um.

[0052] 3) Plasma arc cladding: Fix the titanium alloy substrate on the plasma arc cladding equipment, and the plasma arc cladding the titanium alloy substrate by means of coaxial powder feeding. The process parameters of the plasma arc cladding are as follows: during the welding process, straight forward without swinging is adopted, the working current is 120A, the diameter of the tungsten electrode is 6mm, argon is used as the shielding gas, ion gas and powder feeding gas, and the flow rate of the ion gas is 4L / min, the shielding gas flow rate is 10L / mi...

Embodiment 3

[0055] 1) Pretreatment of the surface of the titanium alloy substrate to be clad: removing the oxide film on the surface of the titanium alloy substrate TC4 alloy;

[0056] 2) Cladding material preparation: a certain mass ratio of Ni, Cr, Si, B, C, CaF 2 , titanium-iron powder mixed evenly; then described cladding powder is carried out vacuum drying treatment, the mass percent of each composition in the described mixed powder is: the proportioning (mass ratio) of powder: Cr 20%, Si 5%, B 5 %, C 0.3%, CaF 2 5%, titanium iron 10%, nickel 54.7%, powder particle size 60um. 3) Plasma arc cladding: Fix the titanium alloy substrate on the plasma arc cladding equipment, and the plasma arc cladding the titanium alloy substrate by means of coaxial powder feeding. The process parameters of plasma arc cladding are: during the welding process, the torch is used to swing, the scanning width is 4mm, the swing range is 8mm on the left and right; the swing speed is 30mm / s, the working curre...

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Abstract

The invention discloses a plasma arc fusion covering abrasion-resistant and corrosion-resistant coating on a titanium alloy surface and a preparation method of the plasma arc fusion covering abrasion-resistant and corrosion-resistant coating. Powder with nickel base components serves as a powder supplying material, and by means of appropriate plasma arc technological parameter selection and combination of a related protection cover and a gas protection device, oxidation and nitridation of substrate base metal in the fusion covering process are effectively prevented; and abrasion-resistant and corrosion-resistant intensifying of the titanium alloy surface is conveniently achieved on plasma arc equipment which is relatively low in price, and higher fusion covering efficiency is acquired through the beneficial effect that the power of the plasma arc is large; and the hardness of a fusion covering layer acquired after fusion covering gives priority to a nickel base solid solution, TiC, TiB2, CrB and other wild phases are distributed in the fusion covering layer, and the hardness of the fusion covering layer can reach about 1,200 Hv.

Description

technical field [0001] The invention relates to the technical field of metal surface coatings, in particular to a plasma arc cladding wear-resistant and corrosion-resistant coating on the surface of a titanium alloy and a preparation method thereof. Background technique [0002] Due to its high strength, low density, good high temperature strength, low temperature toughness and excellent corrosion resistance, titanium alloys are widely used as structural materials in aviation, aerospace, shipbuilding, chemical and biological materials and other industrial sectors. As titanium alloys are used more and more widely, their performance requirements are also getting higher and higher. However, due to the large friction coefficient of titanium alloy, severe adhesive wear, and sensitivity to fretting wear, its wear resistance is poor, and it is easy to catch fire when it is rubbed at high temperature, that is, "titanium fire", which limits its use in friction to a certain extent. a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/134C22C19/05
Inventor 邓相宇
Owner 邓相宇
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