CN115725873A - High-performance engineering fastener material and preparation method thereof - Google Patents
High-performance engineering fastener material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance engineering fastener material and a preparation method thereof, wherein the high-performance engineering fastener material comprises a base material and a protective material arranged on the surface of the base material, wherein the base material is prepared from the following components in percentage by weight: 4 to 6 percent of Al, 0.005 to 0.01 percent of V, 0.01 to 0.05 percent of Nb, 0.01 to 0.02 percent of Ga, 0.6 to 1.5 percent of Ni, 0.005 to 0.008 percent of Os, 1.8 to 2.8 percent of Mn, 0.001 to 0.003 percent of Sr, 0.01 to 0.02 percent of rare earth elements, 0.003 to 0.005 percent of non-metal elements, 0.001 to 0.003 percent of In, 0.003 to 0.005 percent of nano zirconium nitride, 0.001 to 0.003 percent of nano silicon boride and the balance of Cu and other inevitable impurities. The fastener material has excellent mechanical property, corrosion resistance and fatigue resistance.
Description
Technical Field
The invention relates to the technical field of fastener material preparation, in particular to a high-performance engineering fastener material and a preparation method thereof.
Background
In recent years, with the development of engineering fields such as aviation, aerospace, weaponry, ships, chemical engineering, energy and the like, the demand of engineering fastener materials is more and more large, and the performance requirements are more rigorous. Engineering fasteners are mechanical parts used in the engineering field to fasten two or more parts (or components) so that the parts are fastened and connected into a whole, and the performance of the mechanical parts directly affects the engineering quality and safety. Therefore, the development of engineering fastener materials with excellent comprehensive performance and performance stability is imperative.
The existing engineering fastener material is inevitably subjected to collision, construction abrasion, vibration and friction in service in the processes of transportation, installation and load service, and the surface of the existing engineering fastener material is inevitably damaged and destroyed, so that the existing engineering fastener material generates comminuted corrosion. Although some fastener surfaces are maintained by painting, the traditional paint has poor weather resistance and high and low temperature resistance, is easy to crack and peel, and is inevitable to rust. In addition, the engineering fastener materials on the market have the defects of more or less complex processing and manufacturing processes, overhigh cost and further improved fatigue resistance, mechanical strength and performance stability.
In order to solve the above problems, chinese patent document CN111020364A discloses a high-strength stainless steel fastener wire rod for power transmission and transformation engineering and a production method thereof, wherein the wire rod comprises the following components by mass: c: 0.05-0.15%, si is less than or equal to 1.00%, mn is less than or equal to 1.00%, S is less than or equal to 0.010%, P is less than or equal to 0.080%, cr:13 to 15%, ni:1.5 to 2.2 percent of Cu, less than or equal to 0.025 percent of Cu, less than or equal to 0.015 percent of Mo and less than or equal to 0.010 percent of N. The wire overcomes the limitation of the raw materials of the conventional fastener in the aspect of selecting the raw materials, realizes specialization and continuity of the high-strength stainless steel in the production of the fastener wire for the power transmission and transformation project, improves the productivity and yield, reduces the energy consumption and protects the environment. However, the mechanical properties, corrosion resistance and fatigue resistance of the material are still to be further improved.
Therefore, there is a need for a more efficient method for preparing high-performance engineering fastener materials with better mechanical properties, corrosion resistance and fatigue resistance.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a high-performance engineering fastener material with better mechanical properties, corrosion resistance and fatigue resistance, and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-performance engineering fastener material, which comprises a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 4-6% of Al, 0.005-0.01% of V, 0.01-0.05% of Nb, 0.01-0.02% of Ga, 0.6-1.5% of Ni, 0.005-0.008% of Os, 1.8-2.8% of Mn, 0.001-0.003% of Sr, 0.01-0.02% of rare earth elements, 0.003-0.005% of non-metal elements, 0.001-0.003% of In, 0.003-0.005% of nano zirconium nitride, 0.001-0.003% of nano silicon boride and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 50-60 parts of PBT resin, 3-5 parts of polybenzimidazole with an ether ketone structure, 3-5 parts of 4, 4-chloroformyl phenyl ether, 0.8-1.2 parts of anhydrous aluminum chloride, 3-5 parts of 3,3 '-disulfonic acid-4, 4' -difluorophenyl sulfone disodium salt, 8-10 parts of glass fiber, 1-3 parts of coupling agent, 1-2 parts of phosphorus pentoxide and 0.8-1.2 parts of polyphosphoric acid.
Preferably, the thickness of the protective material is 100 to 350 μm.
Preferably, the coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570.
Preferably, the glass fiber is alkali-free chopped glass fiber, the monofilament diameter is 3-5 microns, and the length-diameter ratio is (15-25): 1.
Preferably, the polybenzimidazole containing an ether ketone structure is prepared according to the method of the second example of Chinese patent document CN 101230137B.
Preferably, the PBT resin is a high molecular weight PBT Celanex of tacona 1700A, usa.
Preferably, the average particle size of the nano zirconium nitride is 100nm; the average grain diameter of the nano silicon boride is 60nm.
Preferably, the nonmetal elements are a mixture formed by mixing B and Si according to the mass ratio of 1 (3-5); the rare earth element is a mixture formed by mixing Ce and Gd according to the mass ratio of 1 (1-3).
Another object of the present invention is to provide a method for preparing the high-performance engineering fastener material, which comprises the following steps:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to enable the alloy components to be uniform, doping nano zirconium nitride and nano silicon boride which are preheated to 800-900 ℃ into the smelted alloy melt, then stirring to enable the components to be uniform, introducing the stirred and doped alloy melt into a mold In a nitrogen atmosphere for cooling, and performing homogenization treatment, heat treatment and turning and milling In sequence after demolding to manufacture a fastener base material;
s2, placing the fastener base material prepared in the S1 into a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
Preferably, the homogenization treatment temperature in the step S1 is 1140-1180 ℃, and the time is 35-60min; the heat treatment specifically comprises the following steps: firstly, carrying out solution heat treatment for 40-70min at 1120-1170 ℃ in a nitrogen atmosphere, then cooling to 750-850 ℃ along with a furnace, carrying out aging treatment for 50-150min, and then cooling to room temperature by air.
Preferably, the injection molding process parameters in step S2 are as follows: the injection molding temperature is 240-260 ℃, the injection molding time is 80-180s, the cooling time is 100-200s, and the injection pressure is 60-90MPa.
Due to the application of the technical scheme, the invention has the following beneficial effects:
(1) The high-performance engineering fastener material disclosed by the invention is simple in preparation process, easy to operate, low in equipment dependence, high in production efficiency and yield, suitable for industrial production, and high in social value and cost performance.
(2) The high-performance engineering fastener material disclosed by the invention comprises a fastener base material and a protective material arranged on the surface of the fastener base material, and through the structural arrangement, the corrosion resistance of the material can be enhanced, and the service life of the material can be prolonged; the fastener base material is prepared from the following components in percentage by weight: 4-6% of Al, 0.005-0.01% of V, 0.01-0.05% of Nb, 0.01-0.02% of Ga, 0.6-1.5% of Ni, 0.005-0.008% of Os, 1.8-2.8% of Mn, 0.001-0.003% of Sr, 0.01-0.02% of rare earth elements, 0.003-0.005% of non-metal elements, 0.001-0.003% of In, 0.003-0.005% of nano zirconium nitride, 0.001-0.003% of nano silicon boride and the balance of Cu and other inevitable impurities; through the mutual cooperation and combined action of all the components, the manufactured fastener material has excellent mechanical property, corrosion resistance and fatigue resistance, and is better than other existing products; through the addition of Sr, V, nb, ga, os, rare earth elements and non-metal elements and the synergistic effect of other components, crystal grains can be refined, impurities in a copper matrix can be purified, the density of the material can be improved, and the outward diffusion of matrix atoms and the inward diffusion of external atoms can be prevented; in addition, the corrosion potential of the copper alloy can be improved, so that the corrosion resistance and the mechanical property are improved, and the service life of the copper alloy is prolonged. The addition of the nano zirconium nitride and the nano silicon boride can increase the number of the crystal grains and refine the size of the crystal grains to fill the defects in the crystal and the crystal lattices, and form uniformly distributed hard particles in the structure to prevent the crystal from sliding and wearing, so that the product performance is improved, and the nano zirconium nitride and the nano silicon boride have synergistic effect with other components to further improve the mechanical property, the fatigue resistance and the corrosion resistance of the product.
(3) The invention discloses a high-performance engineering fastener material, which is prepared from the following raw materials in parts by weight: 50-60 parts of PBT resin, 3-5 parts of polybenzimidazole with an ether ketone structure, 3-5 parts of 4, 4-chloroformyl phenyl ether, 0.8-1.2 parts of anhydrous aluminum chloride, 3-5 parts of 3,3 '-disulfonic acid-4, 4' -difluorophenyl sulfone disodium salt, 8-10 parts of glass fiber, 1-3 parts of coupling agent, 1-2 parts of phosphorus pentoxide and 0.8-1.2 parts of polyphosphoric acid. Through the mutual matching and combined action of the raw materials, the formed protective layer has strong corrosion resistance, good ageing resistance and weather resistance and long service life. Through the interaction among the raw materials, an interpenetrating network structure is formed, and a PBT (polybutylene terephthalate), polybenzimidazole, ether ketone, phenyl ether and fluorine-containing phenyl sulfone group structure are simultaneously introduced into the molecular structure of the protective layer, so that the performances are further improved under the multiple actions of an electronic effect, a steric effect and a conjugate effect.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
A high-performance engineering fastener material comprises a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 4% of Al, 0.005% of V, 0.01% of Nb, 0.01% of Ga, 0.6% of Ni, 0.005% of Os, 1.8% of Mn, 0.001% of Sr, 0.01% of rare earth elements, 0.003% of non-metallic elements, 0.001% of In, 0.003% of nano-zirconium nitride, 0.001% of nano-silicon boride and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 50 parts of PBT resin, 3 parts of polybenzimidazole with an ether ketone structure, 3 parts of 4, 4-chloroformyl phenyl ether, 0.8 part of anhydrous aluminum chloride, 3 '-disulfonic acid group-4, 4' -difluorophenyl sulfone disodium salt, 8 parts of glass fiber, 1 part of coupling agent, 1 part of phosphorus pentoxide and 0.8 part of polyphosphoric acid.
The thickness of the protective material is 200 μm; the coupling agent is a silane coupling agent KH550; the glass fiber is alkali-free chopped glass fiber, the monofilament diameter is 3 micrometers, and the length-diameter ratio is 15; the polybenzimidazole containing an ether ketone structure is prepared by a method of the second embodiment of Chinese patent document CN 101230137B; the PBT resin is American Tycona 1700A high molecular weight PBT Celanex; the average grain diameter of the nanometer zirconium nitride is 100nm; the average grain diameter of the nano silicon boride is 60nm.
The nonmetal elements are a mixture formed by mixing B and Si according to the mass ratio of 1; the rare earth element is a mixture formed by mixing Ce and Gd according to the mass ratio of 1.
A preparation method of the high-performance engineering fastener material comprises the following steps:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to enable the alloy components to be uniform, doping nano zirconium nitride and nano silicon boride preheated to 800 ℃ into the smelted alloy melt, then stirring to enable the components to be uniform, introducing the stirred and doped alloy melt into a mold In a nitrogen atmosphere for cooling, and after demolding, sequentially carrying out homogenization treatment, heat treatment and turning and milling to manufacture a fastener base material;
s2, placing the fastener base material prepared in the step S1 in a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
In the step S1, the homogenization temperature is 1140 ℃ and the time is 35min; the heat treatment specifically comprises the following steps: firstly, carrying out solution heat treatment for 40min at 1120 ℃ in a nitrogen atmosphere, then carrying out aging treatment for 50min after cooling to 750 ℃ along with a furnace, and then carrying out air cooling to room temperature.
The injection molding process parameters in the step S2 are as follows: the injection molding temperature is 240 ℃, the injection molding time is 80s, the cooling time is 100s, and the injection pressure is 60MPa.
Example 2
A high-performance engineering fastener material comprises a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 4.5% of Al, 0.006% of V, 0.02% of Nb, 0.013% of Ga, 0.8% of Ni, 0.006% of Os, 2.1% of Mn, 0.0015% of Sr, 0.012% of rare earth elements, 0.0035% of nonmetal elements, 0.0015% of In, 0.0035% of nano zirconium nitride, 0.0015% of nano silicon boride and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 53 parts of PBT resin, 3.5 parts of polybenzimidazole with an ether ketone structure, 3.5 parts of 4, 4-chloroformyl phenyl ether, 0.9 part of anhydrous aluminum chloride, 3.5 parts of 3,3 '-disulfonic acid group-4, 4' -difluorophenyl sulfone disodium salt, 8.5 parts of glass fiber, 1.5 parts of coupling agent, 1.2 parts of phosphorus pentoxide and 0.9 part of polyphosphoric acid.
The thickness of the protective material is 200 μm; the coupling agent is a silane coupling agent KH560; the glass fiber is alkali-free chopped glass fiber, the monofilament diameter is 3.5 microns, and the length-diameter ratio is 17; the polybenzimidazole containing an ether ketone structure is prepared by a method of the second embodiment of Chinese patent document CN 101230137B; the PBT resin is American Tycona 1700A high molecular weight PBT Celanex; the average grain diameter of the nano zirconium nitride is 100nm; the average grain size of the nano silicon boride is 60nm; the nonmetal elements are a mixture formed by mixing B and Si according to the mass ratio of 1; the rare earth element is a mixture formed by mixing Ce and Gd according to the mass ratio of 1.5.
A preparation method of the high-performance engineering fastener material comprises the following steps:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to enable the alloy components to be uniform, doping nano zirconium nitride and nano silicon boride preheated to 830 ℃ into the smelted alloy melt, then stirring to enable the components to be uniform, introducing the stirred and doped alloy melt into a mold In a nitrogen atmosphere for cooling, and after demolding, sequentially carrying out homogenization treatment, heat treatment and turning and milling to manufacture a fastener base material;
s2, placing the fastener base material prepared in the S1 into a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
In the step S1, the homogenization temperature is 1150 ℃ and the time is 45min; the heat treatment specifically comprises the following steps: firstly, carrying out solution heat treatment for 50min at 1140 ℃ in a nitrogen atmosphere, then carrying out aging treatment for 90min after cooling to 780 ℃ along with a furnace, and then carrying out air cooling to room temperature.
The injection molding process parameters in the step S2 are as follows: the injection molding temperature is 245 ℃, the injection molding time is 110s, the cooling time is 130s, and the injection pressure is 70MPa.
Example 3
A high-performance engineering fastener material comprises a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 5% of Al, 0.008% of V, 0.035% of Nb, 0.015% of Ga, 1% of Ni, 0.0065% of Os, 2.3% of Mn, 0.002% of Sr, 0.015% of rare earth elements, 0.004% of non-metallic elements, 0.002% of In, 0.004% of nano zirconium nitride, 0.002% of nano silicon boride and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 55 parts of PBT resin, 4 parts of polybenzimidazole with an ether ketone structure, 4 parts of 4, 4-chloroformyl phenyl ether, 1 part of anhydrous aluminum chloride, 4 parts of 3,3 '-disulfonic acid group-4, 4' -difluorophenyl sulfone disodium salt, 9 parts of glass fiber, 2 parts of coupling agent, 1.5 parts of phosphorus pentoxide and 1 part of polyphosphoric acid.
The thickness of the protective material is 200 μm; the coupling agent is a silane coupling agent KH570; the glass fiber is alkali-free chopped glass fiber, the monofilament diameter is 4 microns, and the length-diameter ratio is 20; the polybenzimidazole containing an ether ketone structure is prepared by a method of the second embodiment of Chinese patent document CN 101230137B; the PBT resin is American Tycona 1700A high molecular weight PBT Celanex; the average grain diameter of the nano zirconium nitride is 100nm; the average grain diameter of the nano silicon boride is 60nm; the nonmetal elements are a mixture formed by mixing B and Si according to the mass ratio of 1; the rare earth element is a mixture formed by mixing Ce and Gd according to a mass ratio of 1.
A preparation method of the high-performance engineering fastener material comprises the following steps:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to enable the alloy components to be uniform, doping nano zirconium nitride and nano silicon boride preheated to 850 ℃ into the smelted alloy melt, then stirring to enable the components to be uniform, introducing the stirred and doped alloy melt into a mold In a nitrogen atmosphere for cooling, and after demolding, sequentially carrying out homogenization treatment, heat treatment and turning and milling to manufacture a fastener base material;
s2, placing the fastener base material prepared in the step S1 in a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
In the step S1, the homogenization temperature is 1160 ℃ and the time is 45min; the heat treatment specifically comprises the following steps: firstly, carrying out solution heat treatment for 55min at 1150 ℃ in a nitrogen atmosphere, then cooling to 800 ℃ along with a furnace, carrying out aging treatment for 100min, and then air-cooling to room temperature.
The injection molding process parameters in the step S2 are as follows: the injection molding temperature is 250 ℃, the injection molding time is 120s, the cooling time is 150s, and the injection pressure is 75MPa.
Example 4
A high-performance engineering fastener material comprises a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 5.5% of Al, 0.009% of V, 0.04% of Nb, 0.018% of Ga, 1.4% of Ni, 0.0075% of Os, 2.6% of Mn, 0.0025% of Sr, 0.018% of rare earth elements, 0.0045% of non-metallic elements, 0.0025% of In, 0.0045% of nano-zirconium nitride, 0.0025% of nano-silicon boride, and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 58 parts of PBT resin, 4.5 parts of polybenzimidazole with an ether ketone structure, 4.5 parts of 4, 4-chloroformyl phenyl ether, 1.1 parts of anhydrous aluminum chloride, 4.5 parts of 3,3 '-disulfonic acid-4, 4' -difluorophenyl sulfone disodium salt, 9.5 parts of glass fiber, 2.5 parts of coupling agent, 1.8 parts of phosphorus pentoxide and 1.1 parts of polyphosphoric acid.
The thickness of the protective material is 200 μm; the coupling agent is a mixture formed by mixing a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH570 in a mass ratio of 1; the glass fiber is alkali-free chopped glass fiber, the monofilament diameter is 4.5 microns, and the length-diameter ratio is 23; the polybenzimidazole containing an ether ketone structure is prepared by a method of the second embodiment of Chinese patent document CN 101230137B; the PBT resin is American Tycona 1700A high molecular weight PBT Celanex; the average grain diameter of the nano zirconium nitride is 100nm; the average grain diameter of the nano silicon boride is 60nm; the nonmetal elements are a mixture formed by mixing B and Si according to the mass ratio of 1; the rare earth element is a mixture formed by mixing Ce and Gd according to the mass ratio of 1.
A preparation method of the high-performance engineering fastener material comprises the following steps:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to enable the alloy components to be uniform, doping nanometer zirconium nitride and nanometer silicon boride preheated to 890 ℃ into the smelted alloy melt, then stirring to enable the components to be uniform, introducing the stirred and doped alloy melt into a mold In a nitrogen atmosphere for cooling, demolding, and then sequentially carrying out homogenization treatment, heat treatment and turning and milling to manufacture a fastener base material;
s2, placing the fastener base material prepared in the S1 into a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
In the step S1, the homogenization treatment temperature is 1170 ℃ and the time is 55min; the heat treatment specifically comprises: firstly, carrying out solution heat treatment for 65min at 1160 ℃ under the nitrogen atmosphere, then carrying out aging treatment for 140min after cooling to 830 ℃ along with a furnace, and then carrying out air cooling to room temperature.
The injection molding process parameters in the step S2 are as follows: the injection molding temperature is 255 ℃, the injection molding time is 160s, the cooling time is 185s, and the injection pressure is 85MPa.
Example 5
A high-performance engineering fastener material comprises a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 6% of Al, 0.01% of V, 0.05% of Nb, 0.02% of Ga, 1.5% of Ni, 0.008% of Os, 2.8% of Mn, 0.003% of Sr, 0.02% of rare earth elements, 0.005% of non-metallic elements, 0.003% of In, 0.005% of nano-zirconium nitride, 0.003% of nano-silicon boride and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 60 parts of PBT resin, 5 parts of polybenzimidazole with an ether ketone structure, 5 parts of 4, 4-chloroformyl phenyl ether, 1.2 parts of anhydrous aluminum chloride, 5 parts of 3,3 '-disulfonic acid group-4, 4' -difluorophenyl sulfone disodium salt, 10 parts of glass fiber, 3 parts of a coupling agent, 2 parts of phosphorus pentoxide and 1.2 parts of polyphosphoric acid.
The thickness of the protective material is 200 μm; the coupling agent is a silane coupling agent KH550; the glass fiber is alkali-free chopped glass fiber, the monofilament diameter is 5 microns, and the length-diameter ratio is 25; the polybenzimidazole containing an ether ketone structure is prepared by a method of the second embodiment of Chinese patent document CN 101230137B; the PBT resin is American Tycona 1700A high molecular weight PBT Celanex; the average grain diameter of the nano zirconium nitride is 100nm; the average grain diameter of the nano silicon boride is 60nm; the nonmetal elements are a mixture formed by mixing B and Si according to the mass ratio of 1; the rare earth element is a mixture formed by mixing Ce and Gd according to the mass ratio of 1.
A preparation method of the high-performance engineering fastener material comprises the following steps:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to enable the alloy components to be uniform, doping nano zirconium nitride and nano silicon boride preheated to 900 ℃ into the smelted alloy melt, then stirring to enable the components to be uniform, introducing the stirred and doped alloy melt into a mold In a nitrogen atmosphere for cooling, and after demolding, sequentially carrying out homogenization treatment, heat treatment and turning and milling to manufacture a fastener base material;
s2, placing the fastener base material prepared in the step S1 in a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
In the step S1, the homogenization treatment temperature is 1180 ℃, and the time is 60min; the heat treatment specifically comprises the following steps: firstly, carrying out solution heat treatment for 70min at 1170 ℃ in a nitrogen atmosphere, then carrying out aging treatment for 150min after cooling to 850 ℃ along with a furnace, and then carrying out air cooling to room temperature.
The injection molding process parameters in the step S2 are as follows: the injection molding temperature is 260 ℃, the injection molding time is 180s, the cooling time is 200s, and the injection pressure is 90MPa.
Comparative example 1
The invention provides a high-performance engineering fastener material, the formula and the preparation method of which are similar to those of example 1, except that V, os, sr, nano zirconium nitride and 3,3 '-disulfonic acid group-4, 4' -difluorophenyl sulfone disodium salt are not added.
Comparative example 2
The invention provides a high-performance engineering fastener material, which has a formula and a preparation method similar to those of example 1, and is different from the formula In that Ga, nb, in, nano silicon boride and polybenzimidazole with an ether ketone structure are not added.
In order to further illustrate the beneficial technical effects of the high-performance engineering fastener material prepared by the embodiments of the present invention, the high-performance engineering fastener material prepared by the embodiments of the present invention is subjected to a relevant performance test, the test results are shown in table 1, and the test method is as follows:
(1) Tensile strength: according to GB/T228.1-2010 part 1 of the tensile test of metal materials: room temperature test method "was carried out on an electronic universal mechanical property tester with a tensile speed of 5mm/min, and the test specimens were processed according to appendix D.
(2) Fatigue resistance: and (3) carrying out constant amplitude fatigue test on the test piece on an Amsler HFP-422 high-frequency fatigue tester (the maximum load is 100MPa, and the minimum load is 20 MPa), and recording and counting the fatigue life.
(3) Corrosion resistance: the prepared high-performance engineering fastener material is subjected to a salt spray corrosion resistance test, the test temperature is 35 ℃, a 5% sodium chloride aqueous solution with mass concentration is sprayed in a test box to simulate the accelerated corrosion of the environment, and the tolerance time (namely the time for maintaining the material not rusted) of the engineering fastener material determines the corrosion resistance.
As can be seen from Table 1, the high-performance engineering fastener material disclosed in the embodiment of the invention has more excellent mechanical properties, corrosion resistance and fatigue resistance compared with the comparative product, which are the result of the synergistic effect of the components and raw materials. The addition of V, os, sr, ga, nb, in, nano zirconium nitride, nano silicon boride, 3 '-disulfonic acid-4, 4' -difluorophenyl sulfone disodium salt and polybenzimidazole containing an ether ketone structure is beneficial to improving the performances.
TABLE 1
| Item | Tensile strength (MPa) | Fatigue life (thousands times) | Corrosion resistance (h) |
| Example 1 | 875 | 14.3 | 1220 |
| Example 2 | 882 | 14.6 | 1233 |
| Example 3 | 887 | 14.8 | 1248 |
| Example 4 | 895 | 14.9 | 1258 |
| Example 5 | 900 | 15.2 | 1270 |
| Comparative example 1 | 828 | 12.1 | 1185 |
| Comparative example 2 | 820 | 11.7 | 1180 |
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The high-performance engineering fastener material is characterized by comprising a fastener base material and a protective material arranged on the surface of the fastener base material, wherein the fastener base material is prepared from the following components in percentage by weight: 4-6% of Al, 0.005-0.01% of V, 0.01-0.05% of Nb, 0.01-0.02% of Ga, 0.6-1.5% of Ni, 0.005-0.008% of Os, 1.8-2.8% of Mn, 0.001-0.003% of Sr, 0.01-0.02% of rare earth elements, 0.003-0.005% of non-metal elements, 0.001-0.003% of In, 0.003-0.005% of nano zirconium nitride, 0.001-0.003% of nano silicon boride and the balance of Cu and other inevitable impurities; the protective material is prepared from the following raw materials in parts by weight: 50-60 parts of PBT resin, 3-5 parts of polybenzimidazole with an ether ketone structure, 3-5 parts of 4, 4-chloroformyl phenyl ether, 0.8-1.2 parts of anhydrous aluminum chloride, 3-5 parts of 3,3 '-disulfonic acid-4, 4' -difluorophenyl sulfone disodium salt, 8-10 parts of glass fiber, 1-3 parts of coupling agent, 1-2 parts of phosphorus pentoxide and 0.8-1.2 parts of polyphosphoric acid.
2. The high performance engineered fastener material of claim 1, wherein the protective material has a thickness of 100-350 μ ι η.
3. The high performance engineered fastener material of claim 1, wherein the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, silane coupling agent KH 570.
4. The high performance engineered fastener material of claim 1, wherein the glass fibers are alkali-free chopped glass fibers having a filament diameter of 3-5 microns and an aspect ratio (15-25): 1.
5. The high performance engineered fastener material of claim 1, wherein the PBT resin is a high molecular weight PBT Celanex, tacona 1700A, usa.
6. The high performance engineered fastener material of claim 1, wherein the nano zirconium nitride has an average particle size of 100nm; the average grain diameter of the nano silicon boride is 60nm.
7. The high-performance engineering fastener material as claimed in claim 1, wherein the non-metallic elements are a mixture formed by mixing B and Si according to a mass ratio of 1 (3-5); the rare earth element is a mixture formed by mixing Ce and Gd according to the mass ratio of 1 (1-3).
8. A method for preparing the high performance engineering fastener material according to any one of claims 1 to 7, comprising the steps of:
s1, smelting raw materials of Cu, cu-Al intermediate alloy, cu-V intermediate alloy, cu-Nb intermediate alloy, cu-Ga intermediate alloy, cu-Ni intermediate alloy, cu-Os intermediate alloy, cu-Mn intermediate alloy, cu-Sr intermediate alloy, cu-In intermediate alloy, cu-B intermediate alloy, cu-Si intermediate alloy, cu-Ce intermediate alloy and Cu-Gd intermediate alloy In a medium-frequency electric furnace, stirring after all the raw materials are completely molten to ensure that the alloy components are uniform, doping nano zirconium nitride and nano silicon boride which are preheated to 800-900 ℃ into the smelted alloy melt, then stirring to ensure that the components are uniform, introducing the stirred and doped alloy melt into a mold under the nitrogen atmosphere for cooling, and performing homogenization treatment, heat treatment and turning and milling In sequence after demolding to prepare a fastener base material;
s2, placing the fastener base material prepared in the S1 into a mold, and closing the mold; and then, uniformly mixing the raw materials of the protective material, adding the mixture into an injection molding machine, performing injection molding, and finally cooling and molding.
9. The method for preparing high performance engineering fastener material according to claim 8, wherein the homogenization treatment temperature in step S1 is 1140-1180 ℃ and the time is 35-60min; the heat treatment specifically comprises: firstly, carrying out solution heat treatment for 40-70min at 1120-1170 ℃ in a nitrogen atmosphere, then cooling to 750-850 ℃ along with a furnace, carrying out aging treatment for 50-150min, and then cooling to room temperature by air.
10. The method for preparing the high-performance engineering fastener material according to claim 8, wherein the injection molding process parameters in the step S2 are as follows: the injection molding temperature is 240-260 ℃, the injection molding time is 80-180s, the cooling time is 100-200s, and the injection pressure is 60-90MPa.
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