CN101157129A - Preparation method of silver-doped nickel-chromium carbide-based high-temperature self-lubricating coating material - Google Patents
Preparation method of silver-doped nickel-chromium carbide-based high-temperature self-lubricating coating material Download PDFInfo
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Abstract
A method for preparing a silver-doped nickel-chromium-carbide-based high-temperature self-lubricating coating material. The method comprises the steps of preparing fluoride-containing nickel-chromium carbide core powder and preparing an oxidation solution and a reduction solution, adding the core powder and a surfactant into the reduction solution, stirring, slowly dropwise adding a silver-ammonia solution into the reduction solution, heating to react so as to enable silver particles to be uniformly deposited on the surface of the core powder, washing, naturally drying, and sintering at high temperature to obtain the silver-doped nickel-chromium carbide-based high-temperature self-lubricating coating material. The self-lubricating coating material prepared by the method has high apparent density and good fluidity, and the coating formed by spraying the self-lubricating coating material prepared by the method is compact, low in friction coefficient and good in self-lubricating property; meanwhile, the preparation method has the advantages of simple process, large production capacity, economy, reliability, industrial popularization and the like.
Description
[technical field]: the invention belongs to plasma spray technology and materials processing technology field, relate to a kind of preparation method of hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base.
[background technology]: the brush seal that adopts in advanced aero-engine and gas turbine design and the manufacturing is a kind of contact sealing, significantly can keep seal clearance constant after the radial displacement in rotatable parts moments, its leakage rate is 1/5 to 1/10 of castor tooth sealing, it is about 2% that the engine oil consumption rate reduces, and improved the operation stability of rotatable parts greatly.In the brush seal, the armature spindle surface (runway) of bristle contact needs spraying one deck high-temperature wear-resisting self-lubricating coating to guarantee in the wearing and tearing of high-temperature fuel gas environment decline low rotor axle and the wear extent that reduces bristle.
As be applied in the brush seal structure, the lip-deep high-temperature self-lubricating coating material of rotor runway, all carried out both at home and abroad certain research work.Sliney adopts the metal fluoride eutectic to permeate in the nichrome that is dispersed in porous and obtains a kind of high-temperature self-lubricating coating material (US Patent 3419363).Subsequently, the further investigation that aero-engine research institutions such as U.S. NASA carry out with various materials brush seal reaches its maturity the brush seal technology, and the high-temperature self-lubricating coating material has also obtained tremendous development.
From the seventies, national many large aerospace men of engine shop such as English, U.S. (Ru Puhui, GE, Luo-Luo company etc.), developed the wearing and tearing coating material system of a plurality of series, as oxide ceramics series, carbide series, carbide alloy series etc., according to different serviceability temperatures and condition, select different types of coating.American Studies has been developed the self-lubrication coating material of various proportionings, as PS/PM212 series etc.One of main feature of such new type high temperature wear resistant self-lubricating coating material is to form as lubricated with fluoride.Fluoride (CaF
2, BaF
2) be the high-temperature lubricating material of superior performance, with itself and other compound use of cermet, be effective kollag in the high temperature.By 62%BaF
2-38%CaF
2The eutectic of forming has than the better greasy property of simple fluoride.
Present self-lubrication coating material generally adopts the mechanical mixing preparation, and prepared powder composition branch is inhomogeneous, and loose specific weight is low, and mobile poor, the coating structure of preparation is inhomogeneous, and greasy property is poor.The present invention adopts the self-lubrication coating material of spraying drying and sintering method preparation, and composition is even, the loose specific weight height, good fluidity, it is simple to have technology, easy operating, low for equipment requirements, the low and good product quality of production cost, output big, economical reliable, can the industry popularization etc. advantage.
[summary of the invention]: the present invention seeks to solve the above-mentioned deficiency of prior art, a kind of preparation method of hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base is provided.
The preparation method of hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base provided by the invention may further comprise the steps:
The first, adopt spray-drying-sintering process to prepare fluoride nickel chromium triangle chromium carbide core powder, wherein BaF
26.2～9.3%, CaF
23.8～5.7%, Ni9～16%, C2～7%, Cr surplus;
The second, allotment oxidation liquid and reducing solution: oxidation liquid is: AgNO
310-80g/l, NaOH 5-50g/l, ammoniacal liquor 5-50g/L; Reducing solution is: hydrazine hydrate 0.1-10g/l, glucose 20-600g/l, tartaric acid 1-100g/l, surfactant 0.25-50g/l, n-butanol 0.1-50g/l;
Three, the core powder that makes of step is added in the reducing solution that two steps join, under constantly stirring, oxidation liquid is slowly dropped in the reducing solution, be heated to 55-99 ℃ and react 10-100min; So that at the core powder surface, forming, the silver particles uniform deposition is wrapped in the lip-deep metallic silver layer of core powder;
Four, after reaction finishes, be cooled to room temperature, pour out supernatant, after the washing of the composite powder after silver-plated, air dry;
Five, will go up dried powder of step in 800 ℃～1200 ℃ sintering 2 to 6 hours, promptly obtain hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base.
Described fluoride is the eutectic of calcirm-fluoride and barium fluoride.
Described surfactant can be one or both in polyvinylpyrrolidone, polyethylene glycol, the polyacrylamide.
The granularity of described core powder can be the arbitrary particle size distribution in the 10 μ m-200 μ m.
The described lip-deep metallic silver layer thickness of core powder that is wrapped in can not wait from the nanoscale to the micron order.
Advantage of the present invention and good effect:
(1) cladding process novelty need not to carry out complicated sensitization activation procedure, can be applied to the preparation of other silver-colored cladded type powder body material.
(2) argent coats evenly, helps reducing the decarburization scaling loss in the spraying process.
(3) self-lubricating component (fluoride, silver) is evenly distributed the coating performance excellence.
In sum, the self-lubrication coating material of this method preparation has the apparent density height, and good fluidity adopts the coating densification of the self-lubrication coating material spraying back formation of this method preparation, and coefficient of friction is low, and self-lubricating property is good; This preparation method has simple, the easy operating, low for equipment requirements of technology simultaneously, the low and good product quality of production cost, output big, economical reliable, can the industry popularization etc. advantage.
[description of drawings]:
Fig. 1 is silver-colored nickel coat chromium chromium carbide surface topography;
Fig. 2 is silver-colored nickel coat lattice chromium carbide section pattern.
[specific embodiment]:
Embodiment 1:
1) the spray-drying sintering process prepares the nickel chromium triangle chromium carbide core powder of fluorinated calcium, wherein BaF
26.2%, CaF
23.8%, Ni10%, C5%, Cr surplus.
2) preparation oxidation liquid and reducing solution, oxidation liquid is: AgNO
310g/l, NaOH 5g/l, ammoniacal liquor 10g/L; Reducing solution is: hydrazine hydrate 0.1g/l, glucose 200g/l, tartaric acid 15g/l, polyethylene glycol .01g/L, n-butanol 5g/l.
3) the core powder is added in the reducing solution.
4) under constantly stirring, oxidation liquid is slowly dropped in the reducing solution, be heated to 98 ℃ and react 90min, be wrapped in the lip-deep metallic silver layer of core powder so that the silver particles uniform deposition at the core powder surface, forms;
5) after reaction finishes, be cooled to room temperature, pour out supernatant, after the washing of the composite powder after silver-plated, air dry.
6) with dried powder under nitrogen protection in 900 ℃ of high temperature sinterings 2 hours, promptly obtain hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base.
The physical property of finished product is as follows: apparent density 2.74g/cm
3, flowing velocity 25.7s/50g.Adopting the coating coefficient of friction of plasma spray coating process preparation is 0.21.
Embodiment 2:
1) spray-drying-sintering process prepares the nickel chromium triangle chromium carbide core powder of fluorinated barium eutectic, wherein BaF
29.3%, CaF
25.7%, Ni15%, C7%, Cr surplus.
2) preparation oxidation liquid and reducing solution, oxidation liquid is: AgNO
350g/l, NaOH 80g/l, ammoniacal liquor 45g/L; Reducing solution is: hydrazine hydrate 0.1g/l, glucose 200g/l, tartaric acid 15g/l, polyacrylamide 0.01g/L, n-butanol 5g/l.
3) the core powder is added in the reducing solution.
4) under constantly stirring, oxidation liquid is slowly dropped in the reducing solution, be heated to 95 ℃ and react 90min, be wrapped in the lip-deep metallic silver layer of core powder so that the silver particles uniform deposition at the core powder surface, forms;
5) after reaction finishes, be cooled to room temperature, pour out supernatant, after the washing of the composite powder after silver-plated, air dry.
6) with dried powder under nitrogen protection in 1050 ℃ of high temperature sinterings 6 hours, promptly obtain hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base.
The physical property of finished product is as follows: apparent density 2.68g/cm
3, flowing velocity 28.5s/50g.Adopting the coating coefficient of friction of plasma spray coating process preparation is 0.19.
Embodiment 3:
1) spray-drying-sintering process prepares the nickel chromium triangle chromium carbide core powder of fluorinated calcium barium fluoride eutectic, wherein BaF
28.2%, CaF
25.0%, Ni9～16%, C2～7%, Cr surplus.
2) preparation oxidation liquid and reducing solution, oxidation liquid is: AgNO
325g/l, NaOH 30g/l, ammoniacal liquor 25g/L; Reducing solution is: hydrazine hydrate 0.1g/l, glucose 200g/l, tartaric acid 15g/l, polyvinylpyrrolidone 0.01g/L, n-butanol 5g/l.3) the core powder is added in the reducing solution.
4) under constantly stirring, oxidation liquid is slowly dropped in the reducing solution, be heated to 98 ℃ and react 60min, be wrapped in the lip-deep metallic silver layer of core powder so that the silver particles uniform deposition at the core powder surface, forms;
5) after reaction finishes, be cooled to room temperature, pour out supernatant, after the washing of the composite powder after silver-plated, air dry.
6) with dried powder under nitrogen protection in 1050 ℃ of high temperature sinterings 4 hours, promptly obtain hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base.
The physical property of finished product is as follows: apparent density 2.82g/cm
3, flowing velocity 24.1s/50g.Adopting the coating coefficient of friction of plasma spray coating process preparation is 0.15.
Claims (5)
1. the preparation method of a hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base is characterized in that this method may further comprise the steps: the first, adopt spray-drying-sintering process to prepare fluoride nickel chromium triangle chromium carbide core powder, wherein BaF
26.2～9.3%, CaF
23.8～5.7%, Ni9～16%, C2～7%, Cr surplus;
The second, allotment oxidation liquid and reducing solution: oxidation liquid is: AgNO
310-80g/l, NaOH 5-50g/l, ammoniacal liquor 5-50g/L, reducing solution is: hydrazine hydrate 0.1-10g/l, glucose 20-600g/l, tartaric acid 1-100g/l, surfactant 0.25-50g/l, n-butanol 0.1-50g/l;
Three, the core powder that makes of step is added in the reducing solution that two steps join, under constantly stirring, slowly drop to oxidation liquid in the reducing solution, be heated to 55-99 ℃ and react 10-100min, so that at the core powder surface, forming, the silver particles uniform deposition is wrapped in the lip-deep metallic silver layer of core powder;
Four, after reaction finishes, be cooled to room temperature, pour out supernatant, after the washing of the composite powder after silver-plated, air dry;
Five, will go up dried powder of step in 800 ℃～1200 ℃ sintering 2 to 6 hours, promptly obtain hyperthermia self-lubricant coating material mixed with silver nichrome chromium carbide base.
2. preparation method according to claim 1 is characterized in that, fluoride is calcirm-fluoride and barium fluoride eutectic.
3. preparation method according to claim 1 is characterized in that, surfactant is one or both in polyvinylpyrrolidone, polyethylene glycol, the polyacrylamide.
4. preparation method according to claim 1 is characterized in that, the granularity of core powder is 10 μ m-200 μ m.
5. preparation method according to claim 1 is characterized in that, being wrapped in the lip-deep metallic silver layer thickness of core powder is nanoscale or micron order.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041466A (en) * | 2010-07-30 | 2011-05-04 | 中国科学院金属研究所 | High-performance high temperature solid self-lubricating coating and preparation method thereof |
| CN101717928B (en) * | 2008-10-09 | 2011-05-18 | 北京有色金属研究总院 | Method for preparing compound powder used for abrasion-resistant self-lubricating coating |
| CN101724803B (en) * | 2008-10-16 | 2011-09-28 | 北京有色金属研究总院 | Preparation method of composite powder for high-temperature wear-resisting self-lubricating coating |
| CN102528049A (en) * | 2010-12-20 | 2012-07-04 | 北京有色金属研究总院 | Composite powder for air bearing and rotor coating and preparation method of composite powder |
| CN101736279B (en) * | 2008-11-05 | 2012-07-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Hypersonic flame spraying process for self-lubricating wear-resistant coating |
| CN103056388A (en) * | 2013-01-22 | 2013-04-24 | 西南科技大学 | Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method |
| CN104120415A (en) * | 2014-07-09 | 2014-10-29 | 陈徐丰 | Mirror-surface nanometer spraying solution and spraying method |
| CN112647074A (en) * | 2020-11-20 | 2021-04-13 | 中机凯博表面技术江苏有限公司 | High-hardness wear-resistant self-lubricating coating and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3419363A (en) * | 1967-05-01 | 1968-12-31 | Nasa | Self-lubricating fluoride-metal composite materials |
| US4728448A (en) * | 1986-05-05 | 1988-03-01 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Carbide/fluoride/silver self-lubricating composite |
| US5866518A (en) * | 1997-01-16 | 1999-02-02 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Self-lubricating composite containing chromium oxide |
| CN1328336C (en) * | 2005-07-11 | 2007-07-25 | 西安交通大学 | Method for preparing self-lubricating coat in use for high temperature |
-
2007
- 2007-11-21 CN CNB2007101502607A patent/CN100560253C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717928B (en) * | 2008-10-09 | 2011-05-18 | 北京有色金属研究总院 | Method for preparing compound powder used for abrasion-resistant self-lubricating coating |
| CN101724803B (en) * | 2008-10-16 | 2011-09-28 | 北京有色金属研究总院 | Preparation method of composite powder for high-temperature wear-resisting self-lubricating coating |
| CN101736279B (en) * | 2008-11-05 | 2012-07-18 | 沈阳黎明航空发动机(集团)有限责任公司 | Hypersonic flame spraying process for self-lubricating wear-resistant coating |
| CN102041466A (en) * | 2010-07-30 | 2011-05-04 | 中国科学院金属研究所 | High-performance high temperature solid self-lubricating coating and preparation method thereof |
| CN102528049A (en) * | 2010-12-20 | 2012-07-04 | 北京有色金属研究总院 | Composite powder for air bearing and rotor coating and preparation method of composite powder |
| CN103056388A (en) * | 2013-01-22 | 2013-04-24 | 西南科技大学 | Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method |
| CN103056388B (en) * | 2013-01-22 | 2015-07-22 | 西南科技大学 | Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method |
| CN104120415A (en) * | 2014-07-09 | 2014-10-29 | 陈徐丰 | Mirror-surface nanometer spraying solution and spraying method |
| CN112647074A (en) * | 2020-11-20 | 2021-04-13 | 中机凯博表面技术江苏有限公司 | High-hardness wear-resistant self-lubricating coating and preparation method thereof |
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Address after: 100160 Beijing City, South West Fourth Ring Road, Fengtai District, No. 188 headquarters base area, building eighteen, No. 23 Patentee after: Beijing General Research Institute of Mining & Metallurgy Address before: 100044, Beijing, Xicheng District, Xizhimen foreign Hing Street, No. 1 Patentee before: Beijing General Research Institute of Mining & Metallurgy |
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Granted publication date: 20091118 Termination date: 20181121 |