CN103132005A - Molybdenum disilicide based abrasion-resisting composite coating and manufacture method thereof - Google Patents
Molybdenum disilicide based abrasion-resisting composite coating and manufacture method thereof Download PDFInfo
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- CN103132005A CN103132005A CN2011103967751A CN201110396775A CN103132005A CN 103132005 A CN103132005 A CN 103132005A CN 2011103967751 A CN2011103967751 A CN 2011103967751A CN 201110396775 A CN201110396775 A CN 201110396775A CN 103132005 A CN103132005 A CN 103132005A
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Abstract
The invention discloses a molybdenum disilicide based abrasion-resisting composite coating and a manufacture method thereof. The molybdenum disilicide based abrasion-resisting composite coating consists of a transition layer and a MoSi2 coating, wherein the transition layer is a Mo material, and the thickness of the MoSi2 coating is 160-300mum. MoSi2 spherical particles subjected to spray drying and microwave sintering treatment and with 18-54mum of particle size serve as spraying powder, and an atmosphere plasma spraying technology is adopted to manufacture the costing. Mo and Mo5Si3 are introduced into the MoSi2 coating, the shortcomings including poor toughness and compactness and the like of the single MoSi2 coating are improved, wettability between the single MoSi2 coating and a matrix is also improved, the bonding strength of particles inside the MoSi2 coating is improved, the porosity of the coating is reduced, and the coating has good abrasion-resisting performance under the dry friction condition.
Description
Technical field
The invention belongs to coating technology field, particularly wear-resisting compound coating of a kind of molybdenum disilicide-base and preparation method thereof.
Background technology
Along with developing rapidly of modern science and technology, also more and more higher to the requirement of component of machine over-all properties, depend merely on the development conventional material and be difficult to reach desired performance range.The general carbon steel wear resisting property is relatively poor, usually by its surface strengthening or formation wear-resistant coating are improved its wear resisting property.In order to improve the work-ing life of general carbon steel, be one of effective means of improving the general carbon steel friction and wear behavior in general carbon steel surface preparation one deck even compact, firmly special protection coating of combination.So, seek the high-performance abrasion-proof coated material, to develop more long life protective coating, have great importance.
In recent years, the surface strengthening technology of material has obtained developing rapidly.Many research institutions just are being devoted to study the wearing character of a large amount of new ceramicss, intermetallic compound and composite coating, to producing the wear-resistant coated material that is adapted under severe environment.Intermetallic compound molybdenum disilicide (MoSi
2) be a kind of extremely attractive high-temperature structural material, it has many and the close character of pottery, as high rigidity, high elastic coefficient, fabulous high-temperature oxidation resistance and excellent corrosion resistance, is a kind of very large high-abrasive material of potentiality that has.But molybdenum disilicide as abrasion-resistant coating material have that fragility is large, poor toughness and the shortcoming such as coating is loose porous, the enhancing of silicified molybdenum coating is mended tough and the coating density is the key issue that its engineering is used.
The coat-thickness of chemical vapour deposition, physical vapor deposition and surface chemistry thermal treatment preparation is thinner, and complex process, production cost are high; And that cladding laser surfaces is coated with formable layer is bad, has hole to exist more, needs subsequent heat treatment, and is not suitable for complex-shaped workpiece.Comparatively speaking, adopt atmospheric plasma spraying technology, easy to operate, coated component can change in a big way, and thickness is easily controlled.Plasma spraying is the technological method that the coatings such as preparation intermetallic compound, pottery and sintering metal have development prospect most.So far, the highly malleablized modification of silicified molybdenum coating with and as the preparation of normal temperature wear-resistant coating with use and also there is not yet report.
Summary of the invention
The object of the invention is to provide and a kind ofly prepares a kind of novel plasma spraying of wearable coating at the carbon steel matrix surface, improves the wear resisting property of carbon steel.
In order to achieve the above object, concrete technical scheme is: the wear-resisting compound coating of a kind of molybdenum disilicide-base, and this compound coating is comprised of transition layer and silicified molybdenum coating, and described transition layer is the Mo material, and the thickness of silicified molybdenum coating is 160～300 μ m.Concrete preparation technology is as follows:
(1) preparation dusty spray: be 0.05～0.2 ultra-fine MoSi of μ m with particle diameter
2Powder is raw material, utilizes drying machine with centrifugal spray to carry out granulation, then adopts the method for vacuum microwave sintering to prepare reunion MoSi
2Powder, the temperature of sintering are 1200 ℃, and the time is 15min, then obtain size range at the MoSi of 18～54 μ m by crossing screen sizing
2Spherical powder;
(2) adopt plasma spraying technology at pretreated substrate material surface spraying Mo transition layer;
(3) with the MoSi of step (1) gained
2Spherical powder is raw material, adopts plasma spraying technology at transition layer surface spraying MoSi
2Coating, spraying parameter is: plasma spraying machine output voltage: 55～70V, outward current: 500～600A, main air stream: argon flow amount 35～60L/min, powder feed rate: 15～50g/min, spray distance: 60～120mm.
The present invention has the following advantages:
1, the present invention utilizes transition layer Mo coating to strengthen MoSi
2Bonding strength between working lining and matrix.The MoSi that air plasma spraying obtains
2Mo and Mo are distributing around coated substrate
5Si
3Phase has improved the density of coating and has improved the microtexture of coating.
2, the present invention selects the MoSi of specified particle size
2As dusty spray, in the coating of preparation with Mo and Mo
5Si
3As the highly malleablized phase, guarantee that coating has certain toughness etc. rich molybdenum, reduce the porosity of coating; Pass through Mo
5Si
3Hard phase strengthens matrix hardness, thereby comprehensively improves the wear resistance of coating.
3, the wear rate of wear-resistant coating of the present invention is 4.56～5.26 * 10
-7mm
3Between/Nm.
4, the plastisied dispersion of coating performance of the present invention is not more than 6%, and the performance circulation ratio of coating is better, and coating structure is evenly fine and close, and combination between layers is better.
Description of drawings
Fig. 1 is MoSi
2The X ray diffracting spectrum of dusty spray.
Fig. 2 is MoSi
2The shape appearance figure of dusty spray.
Fig. 3 is the X ray diffracting spectrum of example 1, example 2, example 3 coatings.
Fig. 4 is the Cross Section Morphology figure of example 1 coating.
Fig. 5 is the Cross Section Morphology figure of example 2 coatings.
Fig. 6 is the Cross Section Morphology figure of example 3 coatings.
Embodiment
Below by embodiment, the present invention is described in further detail.
Embodiment 1:
The wear-resisting compound coating of a kind of molybdenum disilicide-base of the present invention is by transition layer and MoSi
2Coating forms, and described transition layer is the Mo material, described MoSi
2The thickness of coating is 160～300 μ m.
For preparing the wear-resisting compound coating of above-mentioned molybdenum disilicide-base, preparation method of the present invention comprises the following steps:
The first step: preparation dusty spray
With molybdenum powder and silica flour by atomic ratio Mo: Si=1: 2～2.05 fully mix, then the synthetic MoSi of self propagating high temperature in argon gas atmosphere
2Powder; Ball mill crushing to 0.05～0.2 μ m, (parameter: the centrifugal atomizer rotating speed is 18000～22000rpm to utilize the LX-10 drying machine with centrifugal spray to carry out granulation; 25 ℃ of feeding temperatures; Dry inlet temperature is 300 ℃; Dry temperature out is 100 ℃), then adopt (1200 ℃ * 15min) preparation reunion MoSi of the methods of vacuum microwave sintering
2Powder is crossed screen sizing and is obtained size range at the spherical powder of 18～54 μ m.The phase of powder and microscopic appearance are respectively as depicted in figs. 1 and 2.
Second step: take 45 steel as substrate material, to its surface sand-blasting roughening treatment, make the roughness on surface to be sprayed reach Ra25.Adopt plasma spraying technology at 45 steel surface spraying Mo transition layers;
The 3rd step: the size range for preparing in the first step is the MoSi of 18～54 μ m
2Powder is feeding, at Mo transition layer surface spraying MoSi
2Coating, spraying parameter is: plasma spraying machine output voltage: 70V, outward current: 500A, main air stream: argon flow amount 45L/min, powder feed rate: 25g/min, spray distance: 100mm.
The preparation coating phase as shown in Figure 3, principal phase is Mo, MoSi
2And Mo
5Si
3Phase.The Cross Section Morphology of coating such as Fig. 4, wherein grey form and aspect are MoSi
2, shallow white is rich molybdenum phase (Mo and Mo mutually
5Si
3Mixture).Coating porosity is 5.2%, and hardness is 812HV
0.2Carry out wear test with GCr15 (HRC58～62), the wear rate under DRY SLIDING is 4.56 * 10
-7mm
3/ Nm.
Embodiment 2: the present embodiment as different from Example 1: spraying parameter is: plasma spraying machine output voltage: 65V, outward current: 500A, main air stream: argon flow amount 45L/min, powder feed rate: 25g/min, spray distance: 100mm.
The preparation coating phase as shown in Figure 3, principal phase is Mo, MoSi
2And Mo
5Si
3Phase.The Cross Section Morphology of coating such as Fig. 5, wherein grey form and aspect are MoSi
2, shallow white is rich molybdenum phase (Mo and Mo mutually
5Si
3Mixture).Coating porosity is 5.8%, and hardness is 782HV
0.2Carry out wear test with GCr15 (HRC58～62), the wear rate under DRY SLIDING is 4.88 * 10
-7mm
3/ Nm.
Embodiment 3: the present embodiment as different from Example 1: spraying parameter is: plasma spraying machine output voltage: 65V, outward current: 550A, main air stream: argon flow amount 45L/min, powder feed rate: 25g/min, spray distance: 100mm.
The preparation coating phase as shown in Figure 3, principal phase is Mo, MoSi
2And Mo
5Si
3Phase.The Cross Section Morphology of coating such as Fig. 6, wherein grey form and aspect are MoSi
2, shallow white is rich molybdenum phase (Mo and Mo mutually
5Si
3Mixture), coating porosity is 6.1%, and hardness is 748HV
0.2Carry out wear test with GCr15 (HRC58～62), the wear rate under DRY SLIDING is 5.26 * 10
-7mm
3/ Nm.
The above, it is only preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, any technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does according to technical spirit of the present invention.
Claims (3)
1. the wear-resisting compound coating of molybdenum disilicide-base, it is characterized in that: this compound coating is by transition layer and MoSi
2Coating forms, and described transition layer is the Mo material, MoSi
2The thickness of coating is 160～300 μ m.
2. the preparation method of the wear-resisting compound coating of the described molybdenum disilicide-base of claim 1, is characterized in that: comprise the steps:
(1) preparation dusty spray: be 0.05～0.2 ultra-fine MoSi of μ m with particle diameter
2Powder is raw material, utilizes drying machine with centrifugal spray to carry out granulation, then adopts the method for vacuum microwave sintering to prepare reunion MoSi
2Powder is crossed screen sizing and is obtained size range at the MoSi of 18～54 μ m
2Spherical powder;
(2) adopt plasma spraying technology at pretreated substrate material surface spraying Mo transition layer;
(3) with the MoSi of step (1) gained
2Spherical powder is raw material, adopts plasma spraying technology at transition layer surface spraying MoSi
2Coating, spraying parameter is: plasma spraying machine output voltage: 55～70V, outward current: 500～600A, main air stream: argon flow amount 35～60L/min, powder feed rate: 15～50g/min, spray distance: 60～120mm.
3. the preparation method of the wear-resisting compound coating of molybdenum disilicide-base according to claim 2, is characterized in that in step (1), the vacuum microwave sintering method prepares reunion MoSi
2The temperature of powder is 1200 ℃, and the time is 15min.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882422A (en) * | 2014-03-31 | 2014-06-25 | 中国科学院上海硅酸盐研究所 | Method for preparing tantalum disilicide block material |
| CN103882368A (en) * | 2014-03-31 | 2014-06-25 | 中国科学院上海硅酸盐研究所 | Method for preparing tantalum disilicide coating |
| CN106591761A (en) * | 2015-10-14 | 2017-04-26 | 上海宝钢工业技术服务有限公司 | Preparation method for composite coating resisting etching of molten metal |
| CN107523801A (en) * | 2016-06-21 | 2017-12-29 | 张家港市思杰五金工具有限公司 | The method that in-situ chemical vapor deposition method prepares silicified molybdenum coating on molybdenum-base alloy surface |
| CN109321865A (en) * | 2018-12-06 | 2019-02-12 | 江苏丰东热技术有限公司 | One kind forming MoSi in titanium alloy surface2The method of antioxidant coating |
| CN110079775A (en) * | 2019-04-30 | 2019-08-02 | 江苏理工学院 | A kind of molybdenum alloy surface MoSi2The preparation method of coating |
| CN115233134A (en) * | 2022-08-01 | 2022-10-25 | 吉林大学 | Preparation method of coating for improving corrosion and wear resistance of 45CrNi steel surface |
| CN115261847A (en) * | 2022-07-11 | 2022-11-01 | 杨珍 | Molybdenum disilicide composite coating and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882422A (en) * | 2014-03-31 | 2014-06-25 | 中国科学院上海硅酸盐研究所 | Method for preparing tantalum disilicide block material |
| CN103882368A (en) * | 2014-03-31 | 2014-06-25 | 中国科学院上海硅酸盐研究所 | Method for preparing tantalum disilicide coating |
| CN103882422B (en) * | 2014-03-31 | 2016-05-18 | 中国科学院上海硅酸盐研究所 | A kind of method of preparing tantalum silicide block materials |
| CN106591761A (en) * | 2015-10-14 | 2017-04-26 | 上海宝钢工业技术服务有限公司 | Preparation method for composite coating resisting etching of molten metal |
| CN107523801A (en) * | 2016-06-21 | 2017-12-29 | 张家港市思杰五金工具有限公司 | The method that in-situ chemical vapor deposition method prepares silicified molybdenum coating on molybdenum-base alloy surface |
| CN109321865A (en) * | 2018-12-06 | 2019-02-12 | 江苏丰东热技术有限公司 | One kind forming MoSi in titanium alloy surface2The method of antioxidant coating |
| CN109321865B (en) * | 2018-12-06 | 2020-12-15 | 江苏丰东热技术有限公司 | MoSi formed on surface of titanium alloy2Method for oxidation-resistant coating |
| CN110079775A (en) * | 2019-04-30 | 2019-08-02 | 江苏理工学院 | A kind of molybdenum alloy surface MoSi2The preparation method of coating |
| CN110079775B (en) * | 2019-04-30 | 2021-06-15 | 江苏理工学院 | Molybdenum alloy surface MoSi2Method for producing a coating |
| CN115261847A (en) * | 2022-07-11 | 2022-11-01 | 杨珍 | Molybdenum disilicide composite coating and preparation method thereof |
| CN115261847B (en) * | 2022-07-11 | 2024-04-02 | 西部鑫兴稀贵金属有限公司 | Molybdenum disilicide composite coating and preparation method thereof |
| CN115233134A (en) * | 2022-08-01 | 2022-10-25 | 吉林大学 | Preparation method of coating for improving corrosion and wear resistance of 45CrNi steel surface |
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Application publication date: 20130605 |