CN105734489A - Composite coating nitrogen spring and manufacturing method thereof - Google Patents
Composite coating nitrogen spring and manufacturing method thereof Download PDFInfo
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- CN105734489A CN105734489A CN201410748806.9A CN201410748806A CN105734489A CN 105734489 A CN105734489 A CN 105734489A CN 201410748806 A CN201410748806 A CN 201410748806A CN 105734489 A CN105734489 A CN 105734489A
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Abstract
The invention discloses a composite coating nitrogen spring and a manufacturing method thereof. The composite coating nitrogen spring comprises a substrate, and the outer surface of the substrate is sequentially provided with a transition layer, an inner layer and an outer layer. The transition layer is made from Cr, the inner layer is made from CrN, and the outer layer is made from a composite composed of CrN and SiAlTiN. The transition layer is 0.1-0.5 [mu]m thick, the inner layer is 1-2 [mu]m thick, and the outer layer is 2-4 [mu]m thick. The composite coating nitrogen spring overcomes the defects that nitrogen springs in the prior art are high in surface friction coefficient and are prone to fracturing after nitriding treatment, and has the excellent effects that the composite coating nitrogen spring is high in hardness, good in toughness, low in abrasion rate, resistant to corrosion, resistant to oxidation and long in service life, and the friction coefficient of nitrogen spring pistons and rubber is lowered.
Description
Technical field
The present invention relates to coatings art, be specifically related to a kind of composite coating nitrogen spring and preparation method thereof.
Background technology
In mould industry, one uses spring function parts in a large number.In recent years, Tool and Die Technology and Making mold level have a great development and improve, and industrial products are increasing to mould demand, and mould is towards precision, and complicated, efficiently, long-life direction is developed.And the shortcoming that original common elastic functional part also exists some, it is impossible to meet the requirement of new situations.Nitrogen spring is a kind of novel spring function parts, is the upgraded product of conventional helical spring, and it takes up room little, and the life-span is long, has more perfect function, simplifies the design of mould.Nitrogen spring is also widely used in automobile, the industry such as electronics and instrument.
The core component of nitrogen spring is moving piston, and it, constantly with rubber seal friction, generally adopts the method for Nitrizing Treatment to improve hardness, to increase the life-span at home.But it also has the disadvantage that 1, skin-friction coefficient is high, and after using a period of time, surface can be more coarse, can enter vicious cycle.2, Nitrizing Treatment temperature is too high, and matrix becomes fragile, and is easily broken off after accepting, and produces accident.
In order to overcome the problems referred to above, exploitation a kind of high rigidity, high-ductility, low wear rate, corrosion-resistant, antioxidative composite coating, the service life of the nitrogen spring containing this composite coating can bring up to the several times in former service life, save cost and substantial amounts of raw material, manpower, have bigger popularizing application prospect.
Summary of the invention
The technical problem to be solved is in that, the defect being easily broken off after overcoming nitrogen spring skin-friction coefficient of the prior art height, Nitrizing Treatment, it is provided that a kind of composite coating nitrogen spring and preparation method thereof.Described composite coating nitrogen spring has that hardness height, good toughness, wear rate be low, corrosion-resistant, the coefficient of friction of antioxidation, nitrogen spring piston and rubber reduces, the excellent effect such as long service life.
The present invention provides a kind of composite coating nitrogen spring, described composite coating nitrogen spring includes a matrix, described outer surface of matrix has a transition zone, an internal layer and an outer layer successively, the material of described transition zone is Cr, the material of described internal layer is CrN, and described outer layer is CrN and the SiAlTiN composite formed；The thickness of described transition zone is 0.1～0.5 μm；The thickness of described internal layer is 1～2 μm；The thickness of described outer layer is 2～4 μm.
The kind model of described matrix, size are not limit；It is preferably base steel；It is more preferably No. 45 steel.
It is preferred that the thickness of described transition zone is 0.1～0.2 μm.
The bond strength of described transition zone and described matrix reaches 80～120N.Under 10g load, the surface recombination hardness of described composite coating nitrogen spring reaches 40～45GPa, and GCr15 steel to join the coefficient of friction of pair be 0.3～0.5.
The preparation method that the present invention provides a kind of composite coating nitrogen spring, it comprises the following steps:
(1) outer surface of the matrix of composite coating nitrogen spring is sequentially carried out grinding and polishing cleaning treatment and plasma cleaning；
(2) at outside deposition one transition zone of described matrix, the thickness making described transition zone is 0.1～0.5 μm；
(3) at outside deposition one internal layer of described transition zone, the thickness making described internal layer is 1～2 μm；
(4) at outside deposition one outer layer of described internal layer, the thickness making described internal layer is 2～4 μm,.
In step (1), the condition of described grinding and polishing cleaning treatment and method are condition and the method for this area routine.The condition of described plasma cleaning and method are condition and the method for this area routine, it is preferred that, for adopting ion plating technique to carry out plasma cleaning；More preferably, plasma cleaning is undertaken by following condition and method: the temperature of described nitrogen spring is set to 400～450 DEG C, introduce gas Ar, when Ar flow is 650～750mL/min, open impressed current anode, adopting pulsed negative bias, bias dutycycle is 50～80%, and bias peak value is 200V～1000V；Best, when Ar flow is 700mL/min, open impressed current anode.
In step (2), prepare the condition of described transition zone and method is the conventional condition in this area and method.It is preferred that be ion plating；More preferably, ion plating is undertaken by following condition and method: adopt pure Cr target, and arc current is 50～120A, and introducing gas Ar, Ar flow is 20～60mL/min, adopts pulsed negative bias, and bias dutycycle is 30～60%, and bias peak value is 500V～1000V.
In step (3), prepare the condition of described internal layer and method is the conventional condition in this area and method.It is preferred that be ion plating；More preferably, described ion plating is undertaken by following condition and method: introduce gas N2And Ar, N2Flow is 100～300mL/min, Ar flow is 20～40mL/min, adopts pulsed negative bias, biases dutycycle 30～50%, and bias peak value is 200V～600V.
In step (4), prepare the condition of described outer layer and method is the conventional condition in this area and method.It is preferred that be ion plating；More preferably, described ion plating is undertaken by following condition and method: open SiAlTi alloys target, the Si of described SiAlTi alloys target, Al and Ti atomic ratio be (8～12): (58～62): (28～32)；Introduce gas N2And Ar, N2Flow is 100～300mL/min, Ar flow is 20～40mL/min, adopts pulsed negative bias, and bias dutycycle is 30～80%, and bias peak value is 200V～600V；Best, the Si of described SiAlTi alloys target, Al and Ti atomic ratio be 10: 60: 30.
Meeting on the basis of this area general knowledge, above-mentioned each optimum condition, can combination in any, obtain the preferred embodiments of the invention.
Agents useful for same of the present invention and raw material are all commercially.
The actively progressive effect of the present invention is in that: composite coating nitrogen spring of the present invention, in use, the fracture caused owing to substantially becoming fragile after Nitrizing Treatment can be avoided, its surface has good corrosion resistance and bad polishing machine substantially increases service life, improve production efficiency simultaneously, save the production cost of product, it is easy to accomplish commercial production and there is extraordinary prospects for commercial application.
In the present invention, the hardness of described transition zone Cr can reach 500～700Hv, thus having properly increased the hardness of matrix, and Cr and internal layer CrN has good similar compatibility, and the hardness of CrN is between 1600～2000Hv, and thermal coefficient of expansion is 7.6 × 10-6/ K, elastic modelling quantity is 540kN/mm2, there is higher hardness, obdurability and low-friction coefficient, and single CrN coating hardness be still relatively low.And the composite that outer layer CrN and SiAlTiN is formed has good corrosion resistance, high rigidity and film base binding ability.By solution strengthening, nano reinforcement and heterogeneous reinforced, described transition zone, described internal layer and described outer layer can make the hardness of nitrogen spring and toughness significantly improve, so the frictional decrease of composite coating nitrogen spring of the present invention and rubber, service life greatly extends compared with conventional nitrogen spring.
Accompanying drawing explanation
Fig. 1 is the structural representation of the composite coating nitrogen spring of the present invention.
Detailed description of the invention
Mode by the examples below further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.The experimental technique of unreceipted actual conditions in the following example, conventionally and condition, or selects according to catalogue.
In following example, the Si of SiAlTi alloys target, Al and Ti atomic ratio be 10: 60: 30.
Embodiment 1
The preparation method of a kind of composite coating nitrogen spring, it comprises the following steps:
(1) standard testing sample is No. 45 steel matrix composite coating nitrogen spring pistons of 45mm*90mm, after grinding and polishing cleaning treatment, set furnace temperature temperature at 400 DEG C, ion plating is adopted to carry out plasma cleaning on the outer surface of matrix of described composite coating nitrogen spring: matrix pulsed negative bias frequency is 80KHz, bias peak value 200V, bias dutycycle 50%, Ar flow 650mL/min；
(2) by computer control after depositing operation setting, opening ion plating Cr target, arc current is set to 50A, Cr ion and is evaporated from Cr target, and hard alloy substrate carries out bombardment 2min；Then the bias peak value of pulsed bias being adjusted to 500V, bias dutycycle 30%, Ar flow 20mL/min, and maintains ion plating Cr target current 80A, this stage Cr ion and nitrogen react generation Cr, deposit transition zone Cr at described outer surface of matrix, and the time is 20min；
(3) it is then turned on N2Effusion meter, flow is: 100mL/min, Ar flow 20mL/min, and the bias peak value of pulsed bias is adjusted to 200V, biases dutycycle 30%, and at described transition zone outside deposition internal layer CrN, the time is 50min；
(4) opening SiAlTi alloys target, SiAlTi alloys target target current is 80A, Cr target target current is 60A, Ar flow 20mL/min, N2Flow 180mL/min, the bias peak value 200V of pulsed negative bias, bias dutycycle 30%, deposits CrN and the SiAlTiN composite formed to form outer layer at inner layer outer surface, and the time is 80min, obtains the composite coating nitrogen spring of the present invention.Plated film samples after cooling down 2h after stopping.
The composite coating nitrogen spring prepared, its structure is as shown in Figure 1.Matrix 1 outer surface of this composite coating nitrogen spring there are transition zone 2, internal layer 3 and outer layer 4 successively；Wherein, the thickness of transition zone 2 is 0.2 μm, and the thickness of internal layer 3 is 1.5 μm, and the thickness of outer layer 4 is 2.2 μm.
Embodiment 2
The preparation method of a kind of composite coating nitrogen spring, it comprises the following steps:
(1) standard testing sample is No. 45 steel matrix composite coating nitrogen spring pistons of 30mm*80mm, after grinding and polishing cleaning treatment, set furnace temperature temperature at 400 DEG C, ion plating technique is adopted to carry out plasma cleaning on the outer surface of matrix of described composite coating nitrogen spring: matrix pulsed negative bias frequency is 80KHz, bias peak value 500V, bias dutycycle 60%, Ar flow 700mL/min；
(2) by computer control after depositing operation setting, opening ion plating Cr target, arc current is set to 100A, 7Cr ion and is evaporated from Cr target, and hard alloy substrate carries out bombardment 2min；Then the bias peak value of pulsed negative bias is adjusted to 800V, bias dutycycle 30%, Ar flow 40mL/min, and maintain ion plating Cr target current 70A, this stage Cr ion and nitrogen react generation Cr, depositing transition zone Cr at described outer surface of matrix, the time is 20min；
(3) it is then turned on N2Effusion meter, flow is: 120mL/min, Ar flow 20mL/min, and the bias peak value of pulsed negative bias is adjusted to 400V, bias dutycycle 30%, and at described transition zone outside deposition internal layer CrN, the time is 50min；
(4) opening SiAlTi alloys target, SiAlTi alloys target target current is 90A, Cr target target current is 60A, Ar flow 20mL/min, N2Flow 200mL/min, is adjusted to 400V, bias dutycycle 50% by the bias peak value of pulsed negative bias, deposits CrN and the SiAlTiN composite formed to form outer layer at inner layer outer surface, and the time is 80min, obtains the composite coating nitrogen spring of the present invention.Plated film samples after cooling down 2h after stopping.
The composite coating nitrogen spring prepared, its structure is as shown in Figure 1.Matrix 1 outer surface of this composite coating nitrogen spring there are transition zone 2, internal layer 3 and outer layer 4 successively；Wherein, the thickness of transition zone 2 is 0.15 μm, and the thickness of internal layer 3 is 1.4 μm, and the thickness of outer layer 4 is 2.5 μm.
Embodiment 3
The preparation method of a kind of composite coating nitrogen spring, it comprises the following steps:
(1) standard testing sample is No. 45 steel matrix composite coating nitrogen spring pistons of 54mm*90mm, after grinding and polishing cleaning treatment, set furnace temperature temperature at 450 DEG C, ion plating technique is adopted to carry out plasma cleaning on the outer surface of matrix of described composite coating nitrogen spring: matrix pulsed bias frequency is 80KHz, bias peak value 1000V, bias dutycycle 80%, Ar flow 750mL/min；
(2) by computer control after depositing operation setting, opening ion plating Cr target, arc current is set to 120A, Cr ion and is evaporated from Cr target, and hard alloy substrate carries out bombardment 2min；Then the bias peak value of pulsed negative bias is adjusted to 1000V, bias dutycycle 60%, Ar flow 60mL/min, and maintain ion plating Cr target current 80A, this stage Cr ion and nitrogen react generation Cr, depositing transition zone Cr at described outer surface of matrix, the time is 20min；
(3) it is then turned on N2Effusion meter, flow is: 300mL/min, Ar flow 40mL/min, and the bias peak value of pulsed negative bias is adjusted to 600V, bias dutycycle 50%, and at described transition zone outside deposition internal layer CrN, the time is 50min；
(4) opening SiAlTi alloys target, SiAlTi alloys target target current is 100A, Cr target target current is 50A, Ar flow 40mL/min, N2Flow 300mL/min, is adjusted to 600V, bias dutycycle 80% by the bias peak value of pulsed negative bias, deposits CrN and the SiAlTiN composite formed to form outer layer at inner layer outer surface, and the time is 80min, obtains the composite coating nitrogen spring of the present invention.Plated film samples after cooling down 2h after stopping.
The composite coating nitrogen spring prepared, its structure is as shown in Figure 1.Matrix 1 outer surface of this composite coating nitrogen spring there are transition zone 2, internal layer 3 and outer layer 4 successively；Wherein, the thickness of transition zone 2 is 0.5 μm, and the thickness of internal layer 3 is 1.6 μm, and the thickness of outer layer 4 is 2.7 μm.
Comparative example 1
(1) standard testing sample is No. 45 steel matrix nitrogen spring pistons of 45mm*90mm, after grinding and polishing cleaning treatment, set furnace temperature temperature at 450 DEG C, ion plating technique is adopted to carry out plasma cleaning on the outer surface of matrix of described nitrogen spring: matrix pulsed bias frequency is 80KHz, bias peak value-900V, bias dutycycle 60%, Ar flow 40mL/min；
(2) by computer control after depositing operation setting, opening ion plating Cr target, arc current is set to 100A, Cr ion and is evaporated from Cr target, and hard alloy substrate carries out bombardment 2min；Then the bias peak value of pulsed negative bias being adjusted to 300V, dutycycle 30%, Ar flow 40mL/min, and maintains ion plating Cr target current 80A, this stage Cr ion and nitrogen react generation Cr, deposit transition zone Cr at described outer surface of matrix, and the time is 20min；
(3) it is then turned on N2Effusion meter, flow is: 120mL/min, Ar flow 20mL/min, and the bias peak value of pulsed negative bias is adjusted to 200V, and at described transition zone outside deposition internal layer CrN, the time is 150min；
To prepared nitrogen spring measurement, measurement result is: the thickness of transition zone Cr is 0.23 μm, and the thickness of internal layer CrN is 3.1 μm.
Comparative example 2
(1) standard testing sample is No. 45 steel matrix nitrogen spring pistons of 45mm*90mm, after grinding and polishing cleaning treatment, set furnace temperature temperature at 400 DEG C, ion plating technique is adopted to carry out plasma cleaning on the outer surface of matrix of described nitrogen spring: matrix pulsed bias frequency is 80KHz, bias peak value-900V, bias dutycycle 60%, Ar flow 40mL/min；
(2) it is then turned on N2Effusion meter, flow is: 120mL/min, Ar flow 20mL/min, and the bias peak value of pulsed negative bias is adjusted to 200V, deposits internal layer CrN at described outer surface of matrix, and the time is 50min；
(3) opening SiAlTi alloys target, SiAlTi alloys target target current is 80A, Cr target target current is 60A, Ar flow 20mL/min, N2Flow 180mL/min, is adjusted to-200V by the bias peak value of pulsed negative bias, and the time is 80min, must deposit the nitrogen spring of superhard composite coating of the present invention.Plated film samples after cooling down 2h after stopping.
To prepared nitrogen spring measurement, measurement result is: the thickness of internal layer CrN is 1.4 μm, and the thickness of the composite that outer layer CrN and SiAlTiN is formed is 2.6 μm.
Effect example
Wherein, 1, the bond strength (scarification survey adhesion) of described outer layer and matrix；2, the surface recombination hardness of the described nitrogen spring under 10g load；3, the assay method of the composite coefficient of friction of described nitrogen spring；4, the detection method in the service life of described nitrogen spring is all with reference to the relevant regulations in GB/T20914.1-2007/IS017901-1:2003.
Table 1 effect example data
From the data of above-mentioned effect example it can be seen that composite coating nitrogen spring of the present invention: adhesion is high, namely described outer layer, described internal layer, described transition zone have good bond strength with described matrix；10g load lower surface composite hardness is high, and namely composite coating nitrogen spring hardness of the present invention is high；Coefficient of friction is relatively low, and namely composite coating nitrogen spring wear resistance of the present invention is greatly improved, and wear rate can correspondingly reduce；In service life, access times significantly improve, and namely composite coating nitrogen spring of the present invention extends service life, it is possible to correspondingly reduces production cost, it is easy to accomplish commercial production, has good prospects for commercial application.And the nitrogen spring in comparative example 1 is CrN due to internal layer and outer layer, being only service life 20.2 ten thousand times, compared with conventional nitrogen spring, the raising multiple in service life is limited, is only 2.1 times.And the nitrogen spring in comparative example 2 is not owing to containing transition zone Cr, causes nitrogen spring to have the situation departing from coating, cannot be carried out life test completely.Above data explanation, its outer surface of matrix of composite coating nitrogen spring of the present invention has the structure of the composite that transition zone Cr, internal layer CrN and outer layer CrN and SiAlTiN are formed successively and is extending nitrogen spring service life, increases its intensity, less friction reduces the aspects such as abrasion superiority.
The foregoing is only presently preferred embodiments of the present invention, be not intended that the restriction to right, those skilled in that art it is contemplated that other replacements being substantially equal to, all in scope.
Claims (10)
1. a composite coating nitrogen spring, described composite coating nitrogen spring includes a matrix, it is characterized in that, described outer surface of matrix has a transition zone, an internal layer and an outer layer successively, the material of described transition zone is Cr, the material of described internal layer is CrN, and described outer layer is CrN and the SiAlTiN composite formed；The thickness of described transition zone is 0.1～0.5 μm；The thickness of described internal layer is 1～2 μm；The thickness of described outer layer is 2～4 μm.
2. composite coating nitrogen spring as claimed in claim 1, it is characterised in that described matrix is base steel.
3. composite coating nitrogen spring as claimed in claim 2, it is characterised in that described matrix is No. 45 steel.
4. composite coating nitrogen spring as claimed in claim 1, it is characterised in that the thickness of described transition zone is 0.1～0.2 μm.
5. the preparation method preparing composite coating nitrogen spring as claimed in claim 1, it is characterised in that it comprises the following steps:
(1) outer surface of the matrix of composite coating nitrogen spring is sequentially carried out grinding and polishing cleaning treatment and plasma cleaning；
(2) at outside deposition one transition zone of described matrix, the thickness making described transition zone is 0.1～0.5 μm；
(3) at outside deposition one internal layer of described transition zone, the thickness making described internal layer is 1～2 μm；
(4) at outside deposition one outer layer of described internal layer, the thickness making described internal layer is 2～4 μm,.
6. preparation method as claimed in claim 5, it is characterised in that in step (1), adopts ion plating technique to carry out described grinding and polishing cleaning treatment；Described plasma cleaning is undertaken by following condition and method: the temperature of described nitrogen spring is set to 400～450 DEG C, introduce gas Ar, when Ar flow is 650～750mL/min, open impressed current anode, adopt pulsed negative bias, bias dutycycle is 50～80%, and bias peak value is 200V～1000V；
And/or in step (2), adopt ion plating to prepare described transition zone.
7. preparation method as claimed in claim 6, it is characterized in that, in step (2), described ion plating is undertaken by following condition and method: adopt pure Cr target, and arc current is 50～120A, introduces gas Ar, Ar flow is 20～60mL/min, adopting pulsed negative bias, bias dutycycle is 30～60%, and bias peak value is 500V～1000V.
8. preparation method as claimed in claim 5, it is characterised in that in step (3), adopts ion plating to prepare described internal layer；And/or in step (4), adopt ion plating to prepare described outer layer.
9. preparation method as claimed in claim 8, it is characterised in that in step (3), described ion plating is undertaken by following condition and method: introduce gas N2And Ar, N2Flow is 100～300mL/min, Ar flow is 20～40mL/min, adopts pulsed negative bias, biases dutycycle 30～50%, and bias peak value is 200V～600V；
And/or in step (4), described ion plating is undertaken by following condition and method: open SiAlTi alloys target, the Si of described SiAlTi alloys target, Al and Ti atomic ratio be (8～12): (58～62): (28～32)；Introduce gas N2And Ar, N2Flow is 100～300mL/min, Ar flow is 20～40mL/min, adopts pulsed negative bias, and bias dutycycle is 30～80%, and bias peak value is 200V～600V.
10. preparation method as claimed in claim 9, it is characterised in that in step (4), the Si of described SiAlTi alloys target, Al and Ti atomic ratio be 10: 60: 30.
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Application publication date: 20160706 |