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Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition

A high-temperature wear-resistant, composite coating technology, applied in the direction of coating, to achieve the effect of improving high-temperature wear-resistant and anti-friction performance, saving costs, and excellent high-temperature oxidation resistance

Inactive Publication Date: 2015-05-27
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the formation of Ni-P coating on the powder surface by electroless plating and its application in the field of laser cladding technology.

Method used

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  • Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition
  • Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition
  • Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Tungsten disulfide (WS 2 ) powder surface treatment such as pickling, alkali washing and activation, and then nickel sulfate (Ni 2 SO 4 ·6H 2 O) as the main salt, sodium hypophosphite (NaH 2 PO 2 ·H 2 O) is the reducing agent, including complexing agent, catalyst, buffering agent, etc., and the plating solution is prepared, and tungsten disulfide (WS 2 ) powder in the plating solution, using the electroless plating process, the plating temperature is 88 ℃, the plating time is 3 hours, and the plating solution is fully stirred during plating to ensure that the particles are dispersed, and the surface-coated Ni-P alloy disulfide is obtained. Tungsten, counted as WS 2 (Ni-P).

[0021] See attached figure 1 , the tungsten disulfide (WS) coated with Ni-P alloy provided by this embodiment 2 (Ni-P)) powder EDS energy spectrum; carry out energy spectrum analysis on the Ni-P cladding layer of the area taken, and measure the content of each element, by figure 1 It can b...

Embodiment 2

[0024] Adopt the chemical plating method of embodiment one to prepare WS 2 (Ni-P), according to table 1 weight percent proportioning each element, obtains NiCr-Cr with mechanical ball mill mixing method 3 C 2 / WS 2 (Comparative example, WS 2 30wt.%) and NiCr-Cr 3 C 2 / WS 2 (Ni-P) (WS 2 (Ni-P) is 30wt.%) alloy powder mixture, the powder particle size reaches 200-300 mesh.

[0025] Table 1

[0026]

[0027] (3) Use methyl cellulose as a binder, mix it with the above two powder mixtures respectively to form a paste, spread a pre-coated layer on the surface of austenitic stainless steel (0Cr18Ni9), and dry it.

[0028] (4) Irradiate the pre-coated coating with a laser with a power of 1.5 kW, and blow inert gas to the molten pool at the same time to avoid oxidation of the molten pool surface; the laser uses CO 2 Laser, the rectangular spot size is 6 mm × 3 mm, and the laser scanning speed is 4 mm / s.

[0029] (5) According to the size of the austenitic stainless steel (...

Embodiment 3

[0044] The alloy powder mixture was obtained by the method in Example 2.

[0045] The 2123 phenolic resin material is dissolved in ethanol as an adhesive, and the 2123 phenolic resin is a solid phenolic resin formed by polycondensation of phenol and formaldehyde under the action of an acidic catalyst. The binder is blended with the powder mixture, pre-coated on the surface of austenitic stainless steel (0Cr18Ni9), and dried.

[0046] The pre-laying coating was irradiated with a laser with a power of 1.5 kW, and an inert gas was blown to the molten pool to avoid oxidation of the surface of the molten pool; the laser used CO 2 Laser, the rectangular spot size is 6 mm × 3 mm, and the laser scanning speed is 4 mm / s.

[0047] According to the size of the austenitic stainless steel (0Cr18Ni9) substrate, a continuous coating can be obtained by single-pass laser scanning or multi-pass laser scanning. The lapping rate of multiple laps is 30%.

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Abstract

The invention relates to a solid lubricating high-temperature anti-wearing powder composition and a preparation method of a compound coating of the composition. The powder composition comprises the following components in percentage by mass: 14-17.5% of nickel, 3-3.5% of chromium, 49-52.5% of chromium carbide and 25-30% of tungsten disulfide with a surface coated by an alloy-phosphorus alloy. A solid self-lubricating high-temperature anti-wearing compound coating is prepared by the powder composition through utilizing a laser smelting technology. According to the invention, NiCr-Cr3C2 compound powder is used as a metal substrate and the compound coating is formed by a ceramic anti-wearing phase and a metal toughening phase; WS2 is a solid lubricating phase and one layer of a micron-grade Ni-P alloy is coated on the surface of a WS2 powder grain by utilizing a chemical plating method, so that the thermal stability and the chemical stability of WS2 are increased, the decomposition and evaporation of the WS2 in a laser smelting process are effectively inhibited and the compatibility of the WS2 and the metal substrate is increased; and the compound material coating has the characteristic of high-temperature self-lubricating wearing resistance.

Description

technical field [0001] The invention relates to an alloy powder composition and its application, in particular to a powder composition suitable for preparing a solid lubricating high-temperature wear-resistant composite coating by adopting laser cladding technology and a preparation method thereof. Background technique [0002] In cutting-edge technical fields such as aviation, aerospace, nuclear energy, and military industry, there are a large number of frictional motion components that operate under harsh working conditions such as high vacuum, high temperature, high speed, and heavy load, such as high-temperature adiabatic engine bearings, piston rings, For cylinder liners, nuclear valves, steam turbine blades, etc., ordinary lubricating grease can no longer fully meet the requirements of use. It is one of the effective ways to solve the above problems to prepare an efficient, environmentally friendly wear-resistant and anti-friction self-lubricating coating on the surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C29/02C22C30/00B22F1/02C23C18/36C23C24/10
Inventor 刘秀波郑晨杨茂盛何祥明王明娣杨宏兵
Owner SUZHOU UNIV
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