Surface-hardening treatment method of sealing pairs and friction pairs of titanium and titanium alloy ball valves

A hardening treatment and titanium alloy technology, which is applied in gaseous chemical plating, superimposed layer plating, metal material coating technology, etc., can solve the problem of not being able to meet the wear resistance and long-term sealing requirements of titanium and titanium alloy ball valves, which cannot be realized Long-term wear resistance requirements, limited wear resistance of coatings and other issues, to achieve the effects of easy local protection, environmental protection, and improved hardness

Active Publication Date: 2013-10-02
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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Problems solved by technology

[0007] Chinese patent CN102031482A discloses a method for ion nitriding on the surface of medical CoCrMo alloy, which uses pure ammonia NH 3 As a gas source, a nitride ceramic layer is formed on the surface of the cobalt-chromium-molybdenum CoCrMo alloy. The nitride ceramic layer is composed of dense nanostructured chromium nitride Cr 2 The composition of N and chromium nitride CrN compounds improves the surface hardness of CoCrMo alloy to a certain extent, effectively improves the wear resistance of the alloy, and reduces the failure problem caused by the release of toxic cobalt Co and chromium Cr ions. It is used in biomedical and other fields. It has great application potential, but the coating has limited wear resistance and high wear rate, which cannot meet the wear resistance and long-term sealing requirements of titanium and titanium alloy ball valves
[0008] Chinese patent CN202628301U discloses a combined piston ring with a plasma nitriding layer. A nitrided layer with a thickness of 0.01-0.15mm and a hardness of 300-550HV is formed on the outer surface of the first piston ring and the second piston ring by plasma nitriding. , to a certain extent, solves the problem of poor wear resistance of piston rings, but the hardness is low, and the sealing pair of titanium and titanium alloy ball valves is hard friction. Grinding demand
[0009] Chinese patent CN102719691A utilizes nitrogen plasma beam to form Ti+TiH 2 The thin sheet-shaped compact is subjected to scanning heating and nitriding treatment to form a porous structure and obtain dense and continuous TiN and Ti surrounding the Ti skeleton matr

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  • Surface-hardening treatment method of sealing pairs and friction pairs of titanium and titanium alloy ball valves
  • Surface-hardening treatment method of sealing pairs and friction pairs of titanium and titanium alloy ball valves

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[0034] The invention relates to a surface hardening treatment method for titanium and titanium alloy ball valve sealing pairs and friction pairs. The surface hardening treatment method involves chemical heat treatment and vapor deposition hard coating, and the chemical heat treatment and vapor deposition hard coating are simultaneously applied to titanium And the sealing pair and friction pair of titanium alloy ball valve, which solves the problem of low surface hardness of titanium and titanium alloy ball valve after single chemical heat treatment. Due to the problem of poor hardness, the vapor-deposited hard coating further improves the bonding strength of the chemical heat treatment infiltration layer, and improves the hardness of the surface of titanium and titanium alloy ball valves. Even if the vapor-deposited hard coating is damaged during actual use, its The hardened layer formed by the chemical heat treatment infiltration layer can still play a protective role, achievi...

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Abstract

The invention discloses a surface-hardening treatment method of sealing pairs and friction pairs of titanium and titanium alloy ball valves. The sealing pairs are related sealing parts at all sealing positions in a valve, a ball and a valve base, and the friction pairs are related friction parts at all transmission connection positions in the valve, the ball and the valve base. The surface-hardening treatment method relates to chemical heat treatment and a vapor deposition hard coating. The chemical heat treatment and the vapor deposition hard coating are simultaneously used for the sealing pairs and the friction pairs of titanium and titanium alloy ball valves so that the problem that surface hardness of the titanium and titanium alloy ball valves treated by a single chemical heat treatment process is low. Based on the chemical heat treatment, the vapor deposition hard coating is adopted so that a hardness difference of a chemical heat treatment infiltrated layer is reduced. The vapor deposition hard coating further improves bonding strength of the chemical heat treatment infiltrated layer and improves surface hardness of the titanium and titanium alloy ball valves. Even if the vapor deposition hard coating is damaged in actual use, a hardened layer formed from the chemical heat treatment infiltrated layer still has a protection effect so that dual protection is realized.

Description

technical field [0001] The invention belongs to the technical field of alloy surface hardening treatment, and in particular relates to a surface hardening treatment method for a sealing pair and a friction pair of a titanium and titanium alloy ball valve. Background technique [0002] Titanium and titanium alloy ball valves usually include a valve body, a ball and a valve seat. The sealing pair of a titanium and titanium alloy ball valve refers to the sealing part of each seal in the ball and the valve seat. The friction pair of a titanium and titanium alloy ball valve refers to the ball and the valve. The friction parts of each transmission and connection in the seat, the friction pair usually includes the friction between the valve stem and the packing, the friction between the ball and the support plate, the surface hardening mainly deals with the internal parts of titanium and titanium alloy ball valves, and generally does not deal with titanium and titanium alloy ball va...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C8/00C23C10/00C23C14/06C23C16/34C23C16/36
Inventor 李兆峰张斌斌李士凯
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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