CN102321868A - Preparation process of high temperature oxidation resistant coating of foamed aluminum - Google Patents
Preparation process of high temperature oxidation resistant coating of foamed aluminum Download PDFInfo
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- CN102321868A CN102321868A CN201110272087A CN201110272087A CN102321868A CN 102321868 A CN102321868 A CN 102321868A CN 201110272087 A CN201110272087 A CN 201110272087A CN 201110272087 A CN201110272087 A CN 201110272087A CN 102321868 A CN102321868 A CN 102321868A
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Abstract
The invention belongs to the technical field of surface protection of aluminum and aluminum alloy, and particularly relates to a preparation method of a high temperature oxidation resistant coating of foamed aluminum, which comprises the following steps of: (1) charging: placing a seepage source and foamed aluminum at an electrode distance of 13mm to 19mm; (2) vacuumizing; (3) filling argon gas until the air pressure is 45 to 55Pa, opening cooling water, turning on a power supply, firstly turning on a workpiece power supply, exerting 400V voltage, and bombarding the foamed aluminum for 20min; (4) after pre-bombardment, adjusting a source voltage to -950 to -850V and the workpiece voltage to -550 to 450V, so that the temperature of the foamed aluminum and a source electrode is up to 700 to 900 DEG C, and holding; (5) holding for 1 to 3h, adjusting workpiece electrode voltage to 250V, continually holding for 1h, then turning off a source electrode power supply, cooling a workpiece electrode under protection, and turning off a work electrode power supply after 30min; and (6) continuously introducing gas and water for 2h and then turning off a gas source and a water source, pumping a furnace until the pressure is 3Pa, turning off a mechanical pump and all the power supplies, and cooling. The high temperature oxidation resistant coating prepared by the invention has dense film, more uniform grains and low surface roughness.
Description
Technical field: the surface protection technical field that the invention belongs to aluminium and aluminum alloy materials.
Background technology:
Foamed aluminium material is a kind of in the foam materials, and it is to be raw material with aluminium, duraluminum or aluminum matrix composite, and portion forms a kind of novel porous material of great amount of bubbles within it after foaming treatment.Because the existence of pore makes foamed aluminium have a series of special performances: good compressibility, compressed platform stress reach the change of PR in deformation process.Good comprehensive mechanical property (mainly being strength and stiffness) and in light weight be its basic advantage.In addition, foamed aluminium can absorb and the irrelevant higher impact energy of impact direction, can also be effectively applied to aspects such as acoustic absorption, electromagnetic shielding and vibration damping.At the numerous areas of these performances of needs comprehensive utilization, like communications and transportation, building machinery, chemical metallurgy, telecommunications, aerospace, environment protection etc., porous foam aluminium has wide application prospect.
Along with the expansion of the range of application of foamed aluminium, the high temperature oxidation problem is one of main failure mode, and especially the high temperature oxidation under the service condition significantly shortens the work-ing life of workpiece with wearing and tearing.This just requires foamed aluminium to have mechanical behavior under high temperature, resistance to high temperature oxidation and performance such as corrosion-resistant.The effective measure that address this problem are to prepare the resistance to high temperature oxidation protective coating at alloy surface.The method that adopts thermospray is in perishable workpiece area spraying resistance to high temperature oxidation coating, is one of effective means of high temperature protection.More typical protective coating can be divided into following three types by its developing history: dispersion pattern coating (aluminising and modified coating thereof), cladded type coating and thermal barrier coating.Wherein aluminide coating grew up in the 50's of 20th century, still was widely used up till now, and accounted for 90% in the whole high temperature coating.The technology of the Diffusional aluminizing of preparation aluminide coating is day by day ripe, and method is also a lot.But because foamed aluminium self, existing coating process all can't reach on the hole with the hole at the bottom of coating even.Thereby also be not used in the report of preparation foamed aluminium foamed aluminium resistance to high temperature oxidation coating process.
Summary of the invention:
The objective of the invention is to design the method that a kind of plasma surface-alloying process prepares foamed aluminium material resistance to high temperature oxidation coating.
The preparation method of foamed aluminium material resistance to high temperature oxidation coating.
(1) shove charge.Source, foamed aluminium are oozed in placement, interpole gap 13～19mm.
(2) vacuumize.
(3) charge into argon gas to air pressure 45～55Pa, open water coolant, start power supply,, apply 400V voltage, foamed aluminium is carried out the 20min bombardment earlier with the workpiece power supply opening.
(4) after the preparatory bombardment, adjustment source voltage-950～-850 V and workpiece voltage-550～450 V make foamed aluminium and source electrode reach 700～900 ℃, insulation.
(5) behind insulation 1～3h, the workpiece pole tension is turned down to 250V, continued insulation 1h, and then with the source electrode power-off, work utmost point power supply is closed in the atomic brightness protection of workpiece cooling behind the 30min.
(6) continue to close the source of the gas water source behind the ventilation water flowing 2h, with being extracted into 3Pa in the stove, close mechanical pump and all power supplys, cool to room temperature is come out of the stove.
Beneficial effect of the present invention is:
1. plasma surface-alloying process of the present invention can be used for the preparation of foamed aluminium material resistance to high temperature oxidation coating, is because foamed aluminium is a kind of honey-combed of conduction.
2. the ultimate principle of sub-surface alloying process such as of the present invention is to utilize glow-discharge cathode sputter characteristics, makes to handle foamed aluminium surface cleaning, activation, and foamed aluminium is heated up.And the metals ion that is come out by argon ion sputtering in the target (like aluminium, chromium, tungsten etc.) under the attraction of foamed aluminium negative bias, is deposited on workpiece surface and bulk diffusion to foamed aluminium radical rapidly, thereby forms and the good alloy diffusion layer of matrix bond.
3. workpiece voltage of the present invention mainly contains the effect of two aspects, makes workpiece surface receive ion bombardment on the one hand, cleans and the activation workpiece surface, promotes the absorption and the diffusion of alloying element; Heat to workpiece on the other hand, impel the carrying out of thermodiffusion.Workpiece voltage is too high or too low all to be unfavorable for obtaining best surface concn and alloying layer thickness, and cathode voltage of the present invention is-450V ~-550V,
The present invention select source voltage be-850V ~-950V.Increase along with source voltage; The energy and the density (being source current) on ion bombardment source electrode surface increase; Therefore source voltage is favourable to the increasing of alloying layer thickness and the raising of infiltration rate, under the prerequisite of the peak power of considering energy consumption and equipment, improves source voltage.
5. holding temperature of the present invention is 700～900 ℃, soaking time 1～3h.Temperature is high more, and it is fast more to desire the velocity of diffusion of metallic cementation element in matrix, and infiltration layer is thick more.
6. characteristics of the present invention: the thickness of the aluminized coating of preparing under the condition of the present invention is up to 25 μ m, and rete is fine and close, crystal grain is even, surfaceness is low.
Below table 1 be the result of the preparation technology parameter of foamed aluminium material resistance to high temperature oxidation coating.
The result of table 1 preparation technology parameter
| Workpiece voltage (V) | Source voltage (V) | Air pressure (Pa) | Interpole gap (mm) | One-tenth-value thickness 1/10 (μ m) |
| －450 | －950 | 45 | 14 | 20 |
| －550 | －950 | 50 | 16 | 23 |
| －550 | －850 | 50 | 18 | 25 |
| －500 | －850 | 55 | 19 | 19 |
Claims (1)
1. the preparation technology of the resistance to high temperature oxidation coating of a foamed aluminium material adopts plasma surface-alloying process to prepare the method for the resistance to high temperature oxidation coating of foamed aluminium material, it is characterized in that:
(1) shove charge;
Source, foamed aluminium are oozed in placement, interpole gap 13～19mm;
(2) vacuumize;
(3) charge into argon gas to air pressure 45～55Pa, open water coolant, start power supply,, apply 400V voltage, foamed aluminium is carried out the 20min bombardment earlier with the workpiece power supply opening;
(4) after the preparatory bombardment, adjustment source voltage-950～-850 V and workpiece voltage-550～450 V make foamed aluminium and source electrode reach 700～900 ℃, insulation;
(5) behind insulation 1～3h, the workpiece pole tension is turned down to 250V, continued insulation 1h, and then with the source electrode power-off, work utmost point power supply is closed in the atomic brightness protection of workpiece cooling behind the 30min;
(6) continue to close the source of the gas water source behind the ventilation water flowing 2h, with being extracted into 3Pa in the stove, close mechanical pump and all power supplys, cool to room temperature is come out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110272087A CN102321868A (en) | 2011-09-15 | 2011-09-15 | Preparation process of high temperature oxidation resistant coating of foamed aluminum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110272087A CN102321868A (en) | 2011-09-15 | 2011-09-15 | Preparation process of high temperature oxidation resistant coating of foamed aluminum |
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| CN102321868A true CN102321868A (en) | 2012-01-18 |
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| CN201110272087A Pending CN102321868A (en) | 2011-09-15 | 2011-09-15 | Preparation process of high temperature oxidation resistant coating of foamed aluminum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586724A (en) * | 2012-02-28 | 2012-07-18 | 南京航空航天大学 | Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound |
| CN113355630A (en) * | 2021-08-10 | 2021-09-07 | 北京航天天美科技有限公司 | Preparation method of aluminum alloy surface hardness coating |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020046257A (en) * | 2002-05-09 | 2002-06-20 | 이효진 | Manufacturing Method of Solid Metal Foam Composite Bodies by Enhancing the absorption of Incident Radiation |
| CN1766167A (en) * | 2005-11-10 | 2006-05-03 | 中国船舶重工集团公司第七二五研究所 | Foamed aluminium powder electrostatic painting process |
-
2011
- 2011-09-15 CN CN201110272087A patent/CN102321868A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020046257A (en) * | 2002-05-09 | 2002-06-20 | 이효진 | Manufacturing Method of Solid Metal Foam Composite Bodies by Enhancing the absorption of Incident Radiation |
| CN1766167A (en) * | 2005-11-10 | 2006-05-03 | 中国船舶重工集团公司第七二五研究所 | Foamed aluminium powder electrostatic painting process |
Non-Patent Citations (1)
| Title |
|---|
| MATTHIAS MAURER等: "后处理对泡沫铝涂层机械特性影响的研究", 《第六届国际热喷涂研讨会论文》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586724A (en) * | 2012-02-28 | 2012-07-18 | 南京航空航天大学 | Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound |
| CN102586724B (en) * | 2012-02-28 | 2014-08-13 | 南京航空航天大学 | Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound |
| CN113355630A (en) * | 2021-08-10 | 2021-09-07 | 北京航天天美科技有限公司 | Preparation method of aluminum alloy surface hardness coating |
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Application publication date: 20120118 |