CN105356100A - Connector in lawn mower - Google Patents

Connector in lawn mower Download PDF

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Publication number
CN105356100A
CN105356100A CN201510824490.1A CN201510824490A CN105356100A CN 105356100 A CN105356100 A CN 105356100A CN 201510824490 A CN201510824490 A CN 201510824490A CN 105356100 A CN105356100 A CN 105356100A
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China
Prior art keywords
layer
connector
silicon nitride
main shaft
porous silicon
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CN201510824490.1A
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Chinese (zh)
Inventor
杨继波
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Ningbo City Yinzhou Yongjia Connecting Device Factory (general Partner)
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Ningbo City Yinzhou Yongjia Connecting Device Factory (general Partner)
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Priority to CN201510824490.1A priority Critical patent/CN105356100A/en
Publication of CN105356100A publication Critical patent/CN105356100A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/502—Bases; Cases composed of different pieces

Abstract

The invention relates to a connector, particularly relates to a connector in a lawn mower, and belongs to the technical field of alloy materials. The connector comprises a main shaft and is characterized in that the top end face of the main shaft is an arc-shaped surface, the bottom end face of the main shaft is a flat surface, the middle part of the main shaft extends outward in the radial direction and forms a cylindrical ring, the main shaft is provided with a conical ring, the conical ring is located between the bottom end of the main shaft and the cylindrical ring, and the outer diameter of the conical ring increases gradually from the bottom end of the main shaft to the top end of the main shaft. The connector is made of a three-dimensional network silicon nitride ceramic/aluminum alloy composite material, wherein the three-layer layered porous silicon nitride ceramic/aluminum alloy composite material comprises three-layer layered porous silicon nitride ceramic with the volume percent being 10-30% and aluminum alloy with the volume percent being 70-90%. The connector in the lawn mower is made of the three-layer layered porous silicon nitride ceramic/aluminum alloy composite material, has high mechanical properties such as high strength, high temperature stability, wear resistance and corrosion resistance, and also has good electrical conductivity, thermal fatigue resistance and the like.

Description

Connector in a kind of hay mover
Technical field
The present invention relates to a kind of connector, be specifically related to the connector in a kind of hay mover, belong to technical field of alloy material.
Background technology
Connector is a kind of parts common in electronic engineering, and its effect is very simple: be blocked in circuit between place or isolated obstructed circuit, erect the bridge of communication, thus make current flowing, make the function that circuit realiration is predetermined.Connector is indispensable parts in electronic equipment, and the path along current flowing is observed, and always finds that there is one or more connector.Connector form and structure are Protean, along with differences such as application, frequency, power, applied environments, have various multi-form connector.Such as, the connector of lighting and the connector of hard disk drive on court, and the connector lighting rocket differs widely.But connector whatever, all will ensure that electric current is continuously smooth and easy and reliably circulate.And connector of the prior art is made up of metal (as copper alloy, aluminium alloy etc.) substantially, although electric conductivity is better, but the intensity of connector, especially thermal fatigue resistance is comparatively general, have a strong impact on the use of connector, greatly reduce service efficiency and the useful life of connector.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose the connector in a good conductivity, mechanical property is good, service efficiency is high hay mover.
Above-mentioned purpose of the present invention is achieved through the following technical solutions: the connector in a kind of hay mover, described connector comprises main shaft, main shaft top end face is arcwall face, main shaft bottom end face is plane, extend radially outwardly at the middle part of main shaft and be formed with a cylindricality ring, main shaft has a conical ring, conical ring is between main shaft bottom and cylindricality ring, the external diameter of conical ring is increased towards main shaft top gradually by main shaft bottom, described connector is made up of three-dimensional network silicon nitride ceramics/Al alloy composite, described three layer by layer shape porous silicon nitride ceramic/Al alloy composite comprise volume percent content be 10-30% three shape porous silicon nitride ceramic and volume percent content are the aluminium alloy of 70-90% layer by layer.
Connector employing three of the present invention layer by layer shape porous silicon carbide ceramic/Al alloy composite is made, three shape porous SiC ceramics and aluminium alloy support frames each other layer by layer, give full play to the advantage of SiC ceramic and aluminium alloy two class material, effectively improve the high strength of connector, high-temperature stability, mar proof, corrosion resistance etc.If the too high levels of silicon nitride ceramics in the composite, can increase the fragility of composite material, reduce the overall performance of composite material, if the content of silicon nitride ceramics is too low, the resistance to wear of composite material and resistance to elevated temperatures can not get improving.
In the connector of above-mentioned hay mover, described three layer by layer shape silicon nitride ceramics comprise the intermediate layer between upper surface layer, undersurface layer and upper and lower surface layer, wherein upper surface layer and undersurface layer silicon nitride ceramics raw material composition (mass percent) be 90-95%Si 3n 4and 5-10%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 0.5-3%SiO 2, 0.5-1% carbon black, 2-6%Y 2o 3, surplus Si 3n 4.
The present invention is by changing Si in silicon nitride ceramics 3n 4with the relative amount of silicon dioxide and carbon dust, realize controlling the porosity, by changing intermediate layer Si 3n 4the content of crystal seed and interface layer are on the impact of layered porous silicon nitride ceramics sintering character, microstructure and mechanical property.Along with Si 3n 4the increase of seed count, shrinkage reduces gradually, and the porosity reduces gradually.Based on the technique of this kind of control porous silicon nitride porosity, preparation three shape porous silicon nitride ceramic layer by layer.Along with the Si in the raw material of intermediate layer 3n 4the increase gradually of content, shrinkage and the porosity of whole layered porous silicon nitride reduce gradually, and bending strength increases gradually.When intermediate layer differs larger with the shrinkage of superficial layer, although be that weak interface combines, the mechanical property of interface residual stress to layered porous silicon nitride produced is highly beneficial.When the shrinkage of intermediate layer and superficial layer and the porosity close to time, weak interface combines the mechanical property changing strong―binding interface into and be also conducive to improving layered porous silicon nitride ceramics.In a word, as the Si in intermediate layer 3n 4during changes of contents, layered porous silicon nitride ceramics all has higher mechanical property all the time.
Further preferably, the particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
In above-mentioned hay mover in connector, described aluminium alloy is made up of following composition (by percentage to the quality): Si:5.5-6%, Zr:0.05-0.15%, B:0.1-0.2%, Sr:0.01-0.03%, Fe:0.5-0.7%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.01-0.1%, surplus is Al and inevitable impurity element.
Because copper alloy is based on good conductivity and thermal conductivity, therefore, current most of connector all adopts Cu alloy material to make.But, the scarcity of copper resource, Cu alloy material price is higher, so, need a kind of material to replace copper alloy in order to prepare connector.And aluminium alloy density is low, intensity is high, plasticity is good, and have good conductivity and thermal conductivity equally, especially aluminium alloy is cheap, therefore, may be used for alternative copper alloy and prepares connector.
Because aluminium alloy of the present invention replaces copper alloy to prepare connector use, need to ensure good conductivity and thermal conductivity, therefore, for aluminium alloy of the present invention, the elements such as Fe, Cu, Ti, Zn, Mn, Cr all belong to impurity, and these constituent contents are fewer, and the conductance of aluminium alloy is higher.And after Si constituent content common in aluminium alloy reduces, its solid solubility in alloy matrix aluminum reduces relatively, the ability that in aluminium alloy, electronics passes through is stronger, and thus its conduction, heat conductivility are improved.
And the present invention is in order to improve conduction, the heat conductivility of aluminium alloy, in aluminium alloy, also with the addition of B element and Zr element.Because, after adding B element and Zr element simultaneously, B element can make the part Zr element in alloy change precipitation state into by solid solution state, intra-die and grain boundaries is present in the form of tiny en plaque second phase particles, reduce distortion of lattice, improve the order of alloy matrix aluminum, thus beneficial effect can be produced to the improvement of the conduction of aluminium alloy, heat conductivility.
In addition, the present invention also adds rare earth element in aluminium alloy, rare earth element has excellent degasification, removal of impurities effect, can also improve the texture structure of metal, make aluminium alloy crystal more complete, the defects such as the distortion of lattice that foreign atom etc. cause, crystal boundary are fewer, non-solid solution state is present in matrix to separate out state for impurity element, alloying element, make its resistance less, electronics more easily passes through, thus improves conduction, the heat conductivility of aluminium alloy.But, if ree content is too much, still the phenomenon reduced can be there is again in the conduction of aluminium alloy, heat conductivility, because, rare earth element adds the difficulty that electronics passes through while refining aluminum alloy grain structure, and the increase of the content of rare earth element causes part rare earth element to be solid-solution in aluminium alloy crystal, makes its resistance increase.Therefore, the content of rare earth element must control in zone of reasonableness of the present invention.
As preferably, rare earth element is (0.5-1.5) by Y and Er in mass ratio: 1 forms, because, containing Zr element in aluminium alloy of the present invention, Zr is when improving aluminium alloy conductivity and mechanical performance, and both can not coordinate, along with the change of Zr constituent content, when conductivity performance improves time, mechanical performance declines to some extent; And when electric conductivity reduces time, mechanical performance then increases.And the effect of rare earth Er element is just contrary with the effect of Zr element, therefore, when Er element and Zr element jointly being used, good synergy can be played, improve the conduction of aluminium alloy, heat conductivility and mechanical performance simultaneously.And Y element is the rare earth element best with the composite result of use of Er element, good crystal grain thinning and catharsis can be played, improve the conduction of aluminium alloy, heat conductivility and mechanical performance.
As preferably, described aluminium alloy is made up of following composition (by percentage to the quality): Si:5.6-5.8%, Zr:0.08-0.12%, B:0.12-0.16%, Sr:0.015-0.025%, Fe:0.55-0.60%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.02-0.08%, surplus is Al and inevitable impurity element.
In connector in above-mentioned hay mover, described three layer by layer shape porous silicon nitride ceramic/Al alloy composite obtain by the following method:
Press the feed proportioning described in upper surface layer, intermediate layer, undersurface layer respectively, respectively batching is utilized organic carrier dip forming and sinter 1-2h at the nitrogen pressure of 0.3-0.6MPa and 1700-1730 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer;
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 3-4MPa, obtain three shape porous silicon nitride ceramics layer by layer;
By three, shape porous silicon nitride ceramic and aluminium alloy utilize vacuum-air pressure method for casting to make three shape porous silicon carbide ceramic/Al alloy composites layer by layer layer by layer.
First make three shape porous silicon nitride ceramics layer by layer, again by aluminium alloy introducing three layer by layer shape porous silicon nitride ceramic, make silicon nitride ceramics and aluminium alloy support frame each other in the composite material obtained, give full play to the advantage of both materials, and improve the physical property such as hardness, resistance to wear, corrosion resistance of composite material further.
As preferably, the vacuum degree in vacuum-air pressure method for casting is 0.05-0.08MPa.
Three layer by layer shape porous silicon carbide ceramic/Al alloy composite namely be can be made into the connector in hay mover of the present invention by common moulding process, as forging molding, casting etc.
Compared with prior art, the present invention has following beneficial effect:
1, the connector in hay mover of the present invention by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make, there is the advantage of three shape porous silicon carbide ceramic and aluminium alloy bi-materials layer by layer simultaneously, by both proportionings, increase substantially electric conductivity and the heat conductivility of composite material, also effectively improve the high strength of connector, high-temperature stability, mar proof, corrosion resistance etc.
2, the present invention prepares three components of reasonable compatibility aluminium alloy in shape porous silicon carbide ceramic/Al alloy composite layer by layer of connector, not only reduce the content of Si element and the content of impurity, also added B element and Zr element, and with the addition of rare earth element, by the synergy produced between each element, while not reducing Mechanical Properties of Aluminum Alloys, improve the electric conductivity of aluminium alloy, and then improve the conductivity of composite material.
3, the present invention prepares the preparation method of three shape porous silicon carbide ceramic/Al alloy composites layer by layer of connector for first making three shape porous silicon nitride ceramics layer by layer, again by aluminium alloy introducing three layer by layer shape porous silicon nitride ceramic, make silicon nitride ceramics and aluminium alloy support frame each other in the composite material obtained, give full play to the advantage of both materials, and improve the physical property such as hardness, resistance to wear, corrosion resistance of composite material further.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention for the connector of hay mover.
In figure, 1, main shaft; 2, cylindricality ring; 3, conical ring.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1, the present invention is used for the connector of hay mover, comprise main shaft 1, main shaft top end face is arcwall face, main shaft bottom end face is plane, and extending radially outwardly at the middle part of main shaft is formed with a cylindricality ring 2, and main shaft has a conical ring 3, conical ring 3 is between main shaft 1 bottom and cylindricality ring 2, and the external diameter of conical ring 3 is increased towards main shaft top gradually by main shaft 1 bottom.
As preferably, the maximum outside diameter of conical ring 3 is equal with the external diameter of cylindricality ring 2.
Connector of the present invention is made up of three-dimensional network silicon nitride ceramics/Al alloy composite, described three layer by layer shape porous silicon nitride ceramic/Al alloy composite comprise volume percent content be 10-30% three shape porous silicon nitride ceramic and volume percent content are the aluminium alloy of 70-90% layer by layer.
Described three layer by layer shape silicon nitride ceramics comprise the intermediate layer between upper surface layer, undersurface layer and upper and lower surface layer, wherein upper surface layer and undersurface layer silicon nitride ceramics raw material composition (mass percent) be 90-95%Si3N4 and 5-10%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 0.5-3%SiO 2, 0.5-1% carbon black, 2-6%Y 2o 3, surplus Si 3n 4.
As preferably, the particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
Described aluminium alloy is made up of following composition (by percentage to the quality): Si:5.5-6%, Zr:0.05-0.15%, B:0.1-0.2%, Sr:0.01-0.03%, Fe:0.5-0.7%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.01-0.1%, surplus is Al and inevitable impurity element.
As preferably, rare earth element is (0.5-1.5) by Y and Er in mass ratio: 1 forms.
Described three layer by layer shape porous silicon nitride ceramic/Al alloy composite obtain by the following method:
Press the feed proportioning described in upper surface layer, intermediate layer, undersurface layer respectively, respectively batching is utilized organic carrier dip forming and sinter 1-2h at the nitrogen pressure of 0.3-0.6MPa and 1700-1730 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer;
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 3-4MPa, obtain three shape porous silicon nitride ceramics layer by layer;
By three, shape porous silicon nitride ceramic and aluminium alloy utilize vacuum-air pressure method for casting to make three shape porous silicon carbide ceramic/Al alloy composites layer by layer layer by layer.
Embodiment 1
Respectively by the feed proportioning described in upper surface layer, intermediate layer, undersurface layer: raw material composition (mass percent) of upper surface layer and undersurface layer silicon nitride ceramics is 92%Si 3n 4and 8%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 1.8%SiO 2, 0.8% carbon black, 4%Y 2o 3, surplus Si 3n 4; The particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
Respectively batching is utilized organic carrier dip forming and sinter 1.5h at the nitrogen pressure of 0.4MPa and 1720 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer.
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 3.5MPa, obtain three shape porous silicon nitride ceramics layer by layer.
By three shape porous silicon nitride ceramic and aluminium alloy (constituents by weight percentage: Si:5.7% layer by layer, Zr:0.10%, B:0.14%, Sr:0.020%, Fe:0.58%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.06%, surplus is Al and inevitable impurity element, its rare earth elements by Y and Er in mass ratio for 1:1 forms) utilize vacuum-air pressure casting (vacuum degree is 0.06MPa) method to make three shape porous silicon carbide ceramic/Al alloy composites (in composite material, the percent by volume of three shape porous silicon nitride ceramic and aluminium alloys is layer by layer respectively 20% and 80%) layer by layer.
By common forging molding process by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make the connector in hay mover of the present invention.
Embodiment 2
Respectively by the feed proportioning described in upper surface layer, intermediate layer, undersurface layer: raw material composition (mass percent) of upper surface layer and undersurface layer silicon nitride ceramics is 94%Si 3n 4and 6%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 1.0%SiO 2, 0.9% carbon black, 5%Y 2o 3, surplus Si 3n 4; The particle diameter of described carbon black is the particle diameter of 60-80nm, SiO2 is 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
Respectively batching is utilized organic carrier dip forming and sinter 1h at the nitrogen pressure of 0.5MPa and 1710 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer.
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 4MPa, obtain three shape porous silicon nitride ceramics layer by layer.
By three shape porous silicon nitride ceramic and aluminium alloy (constituents by weight percentage: Si:5.8% layer by layer, Zr:0.08%, B:0.16%, Sr:0.015%, Fe:0.60%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.04%, surplus is Al and inevitable impurity element, its rare earth elements by Y and Er in mass ratio for 1.2:1 forms) utilize vacuum-air pressure casting (vacuum degree is 0.055MPa) method to make three shape porous silicon carbide ceramic/Al alloy composites (in composite material, the percent by volume of three shape porous silicon nitride ceramic and aluminium alloys is layer by layer respectively 15% and 85%) layer by layer.
By common forging molding process by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make the connector in hay mover of the present invention.
Embodiment 3
Respectively by the feed proportioning described in upper surface layer, intermediate layer, undersurface layer: raw material composition (mass percent) of upper surface layer and undersurface layer silicon nitride ceramics is 93%Si 3n 4and 7%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 2.5%SiO 2, 0.6% carbon black, 2%Y 2o 3, surplus Si 3n 4; The particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
Respectively batching is utilized organic carrier dip forming and sinter 2h at the nitrogen pressure of 0.5MPa and 1715 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer.
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 3MPa, obtain three shape porous silicon nitride ceramics layer by layer.
By three shape porous silicon nitride ceramic and aluminium alloy (constituents by weight percentage: Si:5.6% layer by layer, Zr:0.12%, B:0.12%, Sr:0.025%, Fe:0.55%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.08%, surplus is Al and inevitable impurity element, its rare earth elements by Y and Er in mass ratio for 0.8:1 forms) utilize vacuum-air pressure casting (vacuum degree is 0.07MPa) method to make three shape porous silicon carbide ceramic/Al alloy composites (in composite material, the percent by volume of three shape porous silicon nitride ceramic and aluminium alloys is layer by layer respectively 25% and 75%) layer by layer.
By common cast shaping process by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make the connector in hay mover of the present invention.
Embodiment 4
Respectively by the feed proportioning described in upper surface layer, intermediate layer, undersurface layer: raw material composition (mass percent) of upper surface layer and undersurface layer silicon nitride ceramics is 95%Si 3n 4and 5%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 3%SiO 2, 0.5% carbon black, 6%Y 2o 3, surplus Si 3n 4; The particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
Respectively batching is utilized organic carrier dip forming and sinter 1h at the nitrogen pressure of 0.6MPa and 1730 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer.
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 4MPa, obtain three shape porous silicon nitride ceramics layer by layer.
By three shape porous silicon nitride ceramic and aluminium alloy (constituents by weight percentage: Si:6% layer by layer, Zr:0.05%, B:0.2%, Sr:0.01%, Fe:0.7%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.01%, surplus is Al and inevitable impurity element, its rare earth elements by Y and Er in mass ratio for 1.5:1 forms) utilize vacuum-air pressure casting (vacuum degree is 0.08MPa) method to make three shape porous silicon carbide ceramic/Al alloy composites (in composite material, the percent by volume of three shape porous silicon nitride ceramic and aluminium alloys is layer by layer respectively 30% and 70%) layer by layer.
By common forging molding process by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make the connector in hay mover of the present invention.
Embodiment 5
Respectively by the feed proportioning described in upper surface layer, intermediate layer, undersurface layer: raw material composition (mass percent) of upper surface layer and undersurface layer silicon nitride ceramics is 90%Si 3n 4and 10%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 0.5%SiO 2, 1% carbon black, 2%Y 2o 3, surplus Si 3n 4; The particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
Respectively batching is utilized organic carrier dip forming and sinter 2h at the nitrogen pressure of 0.3MPa and 1700 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer.
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 3MPa, obtain three shape porous silicon nitride ceramics layer by layer.
By three shape porous silicon nitride ceramic and aluminium alloy (constituents by weight percentage: Si:5.5% layer by layer, Zr:0.15%, B:0.1%, Sr:0.03%, Fe:0.5%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.09%, surplus is Al and inevitable impurity element, its rare earth elements by Y and Er in mass ratio for 0.5:1 forms) utilize vacuum-air pressure casting (vacuum degree is 0.05MPa) method to make three shape porous silicon carbide ceramic/Al alloy composites (in composite material, the percent by volume of three shape porous silicon nitride ceramic and aluminium alloys is layer by layer respectively 10% and 90%) layer by layer.
By common cast shaping process by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make the connector in hay mover of the present invention.
Comparative example 1
This comparative example 1 is the connector on market in common commercially available hay mover.
Comparative example 2
This comparative example 2 is the connector in the hay mover that adopts the aluminium alloy described in embodiment 1 and make.
Connector in hay mover in embodiment 1-5 and in comparative example 1-2 is carried out performance test, and test result is as shown in table 1.
Table 1: the performance test results of the connector in the hay mover in embodiment 1-5 and in comparative example 1-2
In sum, connector in hay mover of the present invention by three layer by layer shape porous silicon carbide ceramic/Al alloy composite make, there is higher mechanical property, as high strength, high-temperature stability, mar proof, corrosion resistance etc., also there are good conductivity, thermal fatigue resistance etc.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.

Claims (8)

1. the connector in a hay mover, it is characterized in that, described connector comprises main shaft, main shaft top end face is arcwall face, main shaft bottom end face is plane, extend radially outwardly at the middle part of main shaft and be formed with a cylindricality ring, main shaft has a conical ring, conical ring is between main shaft bottom and cylindricality ring, the external diameter of conical ring is increased towards main shaft top gradually by main shaft bottom, described connector is made up of three-dimensional network silicon nitride ceramics/Al alloy composite, described three layer by layer shape porous silicon nitride ceramic/Al alloy composite comprise volume percent content be 10-30% three shape porous silicon nitride ceramic and volume percent content are the aluminium alloy of 70-90% layer by layer.
2. connector in a kind of hay mover according to claim 1, it is characterized in that, described three layer by layer shape silicon nitride ceramics comprise the intermediate layer between upper surface layer, undersurface layer and upper and lower surface layer, wherein upper surface layer and undersurface layer silicon nitride ceramics raw material composition (mass percent) be 90-95%Si 3n 4and 5-10%Y 2o 3, raw material composition (mass percent) of intermediate layer silicon nitride ceramics is 0.5-3%SiO 2, 0.5-1% carbon black, 2-6%Y 2o 3, surplus Si 3n 4.
3. connector in a kind of hay mover according to claim 2, is characterized in that, the particle diameter of described carbon black is 60-80nm, SiO 2particle diameter be 0.1-0.5 μm, Y 2o 3particle diameter be 0.2-1.2 μm, Si 3n 4for the α-Si of α >95% 3n 4.
4. connector in a kind of hay mover according to claim 1, it is characterized in that, described aluminium alloy is made up of following composition (by percentage to the quality): Si:5.5-6%, Zr:0.05-0.15%, B:0.1-0.2%, Sr:0.01-0.03%, Fe:0.5-0.7%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.01-0.1%, surplus is Al and inevitable impurity element.
5. connector in a kind of hay mover according to claim 4, is characterized in that, rare earth element is (0.5-1.5) by Y and Er in mass ratio: 1 forms.
6. connector in a kind of hay mover according to claim 4, it is characterized in that, described aluminium alloy is made up of following composition (by percentage to the quality): Si:5.6-5.8%, Zr:0.08-0.12%, B:0.12-0.16%, Sr:0.015-0.025%, Fe:0.55-0.60%, Cu≤0.01%, Mg≤0.01%, Mn≤0.01%, Cr≤0.001%, Ti≤0.02%, V≤0.02%, Zn≤0.05%, rare earth element: 0.02-0.08%, surplus is Al and inevitable impurity element.
7. connector in a kind of hay mover according to any one of claim 1-6, is characterized in that, described three layer by layer shape porous silicon nitride ceramic/Al alloy composite obtained by following preparation method:
Press the feed proportioning described in upper surface layer, intermediate layer, undersurface layer respectively, respectively batching is utilized organic carrier dip forming and sinter 1-2h at the nitrogen pressure of 0.3-0.6MPa and 1700-1730 DEG C, respectively the dry powder of obtained upper surface layer, intermediate layer, undersurface layer;
The dry powder of obtained upper surface layer, intermediate layer, undersurface layer is applied successively and puts, finally make type at the pressure of 3-4MPa, obtain three shape porous silicon nitride ceramics layer by layer;
By three, shape porous silicon nitride ceramic and aluminium alloy utilize vacuum-air pressure method for casting to make three shape porous silicon carbide ceramic/Al alloy composites layer by layer layer by layer.
8. connector in a kind of hay mover according to claim 7, is characterized in that, the vacuum degree in vacuum-air pressure method for casting is 0.05-0.08MPa.
CN201510824490.1A 2015-11-24 2015-11-24 Connector in lawn mower Withdrawn CN105356100A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1727096A (en) * 2005-06-16 2006-02-01 东北大学 3D networked vacuum-air pressure method for casting friction composite material of ceramics-metals
CN103872508A (en) * 2014-03-19 2014-06-18 苏州华旃航天电器有限公司 Injection molding sealing through-wall electric connector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1727096A (en) * 2005-06-16 2006-02-01 东北大学 3D networked vacuum-air pressure method for casting friction composite material of ceramics-metals
CN103872508A (en) * 2014-03-19 2014-06-18 苏州华旃航天电器有限公司 Injection molding sealing through-wall electric connector

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