CN111724942A - Rare earth high-iron aluminum alloy fireproof cable and preparation method thereof - Google Patents
Rare earth high-iron aluminum alloy fireproof cable and preparation method thereof Download PDFInfo
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- CN111724942A CN111724942A CN202010721123.XA CN202010721123A CN111724942A CN 111724942 A CN111724942 A CN 111724942A CN 202010721123 A CN202010721123 A CN 202010721123A CN 111724942 A CN111724942 A CN 111724942A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 141
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 118
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 116
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 109
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000010410 layer Substances 0.000 claims abstract description 103
- 239000004020 conductor Substances 0.000 claims abstract description 59
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003063 flame retardant Substances 0.000 claims abstract description 34
- 239000011241 protective layer Substances 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 38
- 229910052782 aluminium Inorganic materials 0.000 claims description 38
- 238000003723 Smelting Methods 0.000 claims description 22
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 21
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 21
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- 238000000137 annealing Methods 0.000 claims description 20
- 239000000919 ceramic Substances 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 13
- 230000009970 fire resistant effect Effects 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 229920002379 silicone rubber Polymers 0.000 claims description 11
- 229910052684 Cerium Inorganic materials 0.000 claims description 10
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical group [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052746 lanthanum Inorganic materials 0.000 claims description 10
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 238000007872 degassing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 239000004945 silicone rubber Substances 0.000 claims description 5
- 229910052712 strontium Inorganic materials 0.000 claims description 5
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000012856 weighed raw material Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 6
- 239000010445 mica Substances 0.000 description 5
- 229910052618 mica group Inorganic materials 0.000 description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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Abstract
The invention discloses a rare earth high-iron aluminum alloy fireproof cable, and belongs to the technical field of power cables. The fireproof cable comprises a rare earth high-iron aluminum alloy conductor and a protective layer, wherein at least two rare earth high-iron aluminum alloy conductors are arranged in the protective layer. The outside of tombarthite high-speed railway aluminium alloy conductor is provided with flame retardant coating and first insulating layer, and the flame retardant coating is located tombarthite high-speed railway aluminium alloy conductor and between the first insulating layer, is provided with the second insulating layer between first insulating layer and the inoxidizing coating. The protective layer is provided with a concentric flame-retardant layer and a sheath in sequence from inside to outside, the sheath is located outside the flame-retardant layer, and a second insulating layer is arranged between the flame-retardant layer and the first insulating layer. The invention also discloses a preparation method of the rare earth high-iron aluminum alloy fireproof cable. The fireproof cable prepared by the rare earth high-iron aluminum alloy fireproof cable and the preparation method thereof has the characteristics of good fire resistance and fireproof performance, and the service life of the cable is prolonged; and has the advantages of good conductivity, plasticity and creep resistance.
Description
Technical Field
The invention belongs to the technical field of power cables, and particularly relates to a rare earth high-iron aluminum alloy fireproof cable and a preparation method thereof.
Background
Along with the more and more strict requirements of domestic buildings on fire protection, especially when selecting power cables, the fire department has higher requirements on the fire-protection grade of the cables, and the low-voltage insulation fire-resistant cables in the prior art mainly comprise the following: firstly, a low-voltage insulating fire-resistant cable wrapped with mica tapes is wrapped; and the other is a mineral insulation fire-resistant cable.
The mica tape and the glass fiber tape form a fire-resistant insulating composite layer. The probability of mica tape fracture and bag leakage is higher in the manufacturing process of the cable, so that the fire-resistant quality requirement is difficult to control, and the situation that a mica layer falls off is easily generated in the wrapping process, so that the fireproof performance of the cable is reduced, and the normal use of the cable is influenced.
Disclosure of Invention
The invention aims to provide a rare earth high-iron aluminum alloy fireproof cable, which solves the problem that the fire resistance of the cable is reduced due to the fact that a mica tape of the cable is easy to crack, leak and fall off in the prior art. The invention also aims to provide a preparation method of the rare earth high-iron aluminum alloy fireproof cable.
In order to achieve the purpose, the invention provides a rare earth high-iron aluminum alloy fireproof cable which comprises a rare earth high-iron aluminum alloy conductor and a protective layer, wherein at least two rare earth high-iron aluminum alloy conductors are arranged in the protective layer;
a fireproof layer and a first insulating layer are arranged outside the rare earth high-iron aluminum alloy conductor, the fireproof layer is positioned between the rare earth high-iron aluminum alloy conductor and the first insulating layer, and a second insulating layer is arranged between the first insulating layer and the protective layer;
the protective layer is provided with a concentric flame-retardant layer and a sheath in sequence from inside to outside, the sheath is located outside the flame-retardant layer, and a second insulating layer is arranged between the flame-retardant layer and the first insulating layer.
Preferably, the rare earth high-iron aluminum alloy conductor is formed by stranding a plurality of rare earth high-iron aluminum alloy monofilaments, and the rare earth high-iron aluminum alloy monofilaments are of an oval structure.
Preferably, the first insulating layer is a crosslinked polyethylene insulating layer, the second insulating layer is a ceramic fireproof silicone rubber layer, and the fireproof layer is an inorganic mineral insulating fireproof layer.
Preferably, the inside of inoxidizing coating is provided with 4 tombarthite high-speed railway aluminum alloy conductors, and 4 tombarthite high-speed railway aluminum alloy conductors are the circumference array around the axis of cable and distribute, are provided with the halogen-free filler strip between the tombarthite high-speed railway aluminum alloy conductor, and the halogen-free filler strip sets up with the cable is coaxial.
Preferably, the rare earth high-iron aluminum alloy monofilament comprises the following components in percentage by mass: 1.0 to 1.5 percent of iron, 0.03 to 0.08 percent of silicon, 0.02 to 0.08 percent of copper, 0.02 to 0.08 percent of manganese, 0.01 to 0.05 percent of magnesium, 0.01 to 0.08 percent of titanium, 0.01 to 0.08 percent of zirconium, 0.05 to 0.1 percent of chromium, 0.01 to 0.05 percent of strontium, 0.8 to 1.5 percent of rare earth, less than or equal to 0.1 percent of the sum of impurity contents and the balance of aluminum.
Preferably, the rare earth element is cerium, lanthanum or a mixture of cerium and lanthanum.
The preparation method of the rare earth high-iron aluminum alloy fireproof cable comprises the following steps:
s1, preparing materials, and weighing the raw materials according to set chemical components for later use;
s2, melting aluminum ingots, namely putting the aluminum ingots with the purity higher than 99.8% into a melting furnace for melting, wherein the melting temperature is 750-;
s3, smelting, namely adding the weighed raw materials into the heat-preserved aluminum liquid according to the component design into a smelting furnace for smelting, refining and degassing, and preserving heat after uniform smelting;
s4, casting and forming, namely casting the smelted aluminum liquid to form an aluminum strip;
s5, rolling, namely rolling the cast aluminum strip by a rolling mill to form a rare earth high-iron aluminum alloy rod with phi 9 mm;
s6, drawing, namely drawing the rare earth high-iron aluminum alloy rod into an oval or runway rare earth high-iron aluminum alloy monofilament by using a thirteen-die drawing machine; twisting the rare earth high-iron aluminum alloy monofilament on a frame twist by adopting a special-shaped twisting die to form a rare earth high-iron aluminum alloy conductor;
s7, performing heat treatment, namely putting the rare earth high-iron aluminum alloy conductor into an annealing furnace for annealing, wherein the annealing temperature is 300 +/-10 ℃, and the annealing time is 6-9 h; after the rare earth high-iron aluminum alloy conductor is naturally cooled, wrapping an inorganic mineral insulating fireproof layer and a crosslinked polyethylene insulating layer on the outer portion of the rare earth high-iron aluminum alloy conductor, wrapping a flame-retardant layer on the outer portion of the crosslinked polyethylene insulating layer, filling a ceramic fire-resistant silicon rubber layer between the flame-retardant layer and the crosslinked polyethylene insulating layer, filling a halogen-free filling strip on the rare earth high-iron aluminum alloy conductor, and sleeving a sheath to form the rare earth high-iron aluminum alloy fireproof cable.
The rare earth high-iron aluminum alloy fireproof cable and the preparation method thereof have the advantages and positive effects that:
1. the outside of cable is low smoke and zero halogen flame retardant sheath, and the outside parcel of conductor has inorganic mineral insulation flame retardant coating and crosslinked polyethylene insulating layer, can improve the fire resistance of cable.
2. The ceramic fire-resistant silicone rubber layer is arranged between the crosslinked polyethylene insulating layer and the flame-retardant layer, and can be subjected to ceramic formation after high-temperature combustion to form a hard ceramic protective layer, so that the rare earth high-iron aluminum alloy conductor is prevented from being damaged, and the service life and the use safety of the cable are improved.
3. The aluminum monofilaments are in an oval or track-shaped structure, and the conventional round monofilament structure is abandoned, so that more aluminum monofilaments can be arranged in unit area, the aluminum monofilaments are arranged closely, and the cross-sectional area of the cable is reduced.
4. The rare earth elements are added into the aluminum alloy, and can be used for modifying the aluminum alloy, refining crystal grains of the aluminum alloy, improving the strength of the aluminum alloy and improving the plasticity of the aluminum alloy. And the rare earth high-iron aluminum alloy monofilament has high section brightness after the aluminum alloy is subjected to modification treatment by adopting rare earth elements.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a rare earth high-iron aluminum alloy fireproof cable and a preparation method thereof.
Reference numerals
1. A sheath; 2. a flame retardant layer; 3. a ceramic fireproof silicon rubber layer; 4. a crosslinked polyethylene insulating layer; 5. inorganic mineral insulating and fireproof layers; 6. a rare earth high-iron aluminum alloy conductor; 7. and (4) halogen-free filling strips.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the following examples are provided to explain the detailed embodiments and specific operations of the present invention, but the scope of the present invention is not limited to the following examples.
Fig. 1 is a schematic structural diagram of an embodiment of a rare earth high-iron aluminum alloy fireproof cable and a preparation method thereof. The utility model provides a tombarthite high-speed railway aluminum alloy fireproof cable, includes tombarthite high-speed railway aluminum alloy conductor 6 and inoxidizing coating, and the inside of inoxidizing coating is provided with two tombarthite high-speed railway aluminum alloy conductors 6 at least. Preferably, the inside of the protective layer is provided with 4 conductors 6 of rare earth high iron aluminum alloy, and the 4 conductors 6 of rare earth high iron aluminum alloy are distributed in a circumferential array around the axis of the cable. And halogen-free filler strips 7 are arranged between the rare earth high-iron aluminum alloy conductors 6, and the halogen-free filler strips 7 are arranged coaxially with the cable. The halogen-free filling strips 7 have a good flame retardant effect, and can effectively separate the rare earth high-iron aluminum alloy conductor 6, so that the flame retardant effect is improved.
The outside of tombarthite high-iron aluminum alloy conductor 6 is provided with flame retardant coating and first insulating layer, and the flame retardant coating is located tombarthite high-iron aluminum alloy conductor 6 and first insulating layer between. The first insulating layer is a crosslinked polyethylene insulating layer 4, and the fire-proof layer is an inorganic mineral insulating fire-proof layer 5. The protective layer is provided with a concentric flame-retardant layer 2 and a sheath 1 from inside to outside in sequence, and the sheath 1 is positioned outside the flame-retardant layer 2. The sheath 1 is a low-smoke halogen-free flame-retardant sheath 1, has a good flame-retardant effect, and improves the fireproof performance of the cable. A second insulating layer is arranged between the flame-retardant layer 2 and the first insulating layer, and the second insulating layer is a ceramic fireproof silicone rubber layer 3. The ceramic fireproof silicone rubber layer 3 can be fired into a ceramic shape after high-temperature combustion to form a hard ceramic armor, and the higher the temperature and the longer the ablation time are, the harder the ceramic armor is. The setting of pottery fire-resistant silastic-layer 3 has better guard action to tombarthite high-iron aluminum alloy conductor 6, improves the fire behavior of cable to can effectually prevent that the cable from breaking, improve the life of cable.
The rare earth high-iron aluminum alloy conductor 6 is formed by stranding a plurality of rare earth high-iron aluminum alloy monofilaments, and the rare earth high-iron aluminum alloy monofilaments are of an oval structure. The structure of tombarthite high-iron aluminum alloy monofilament has abandoned traditional circular monofilament structure, adopts the heterotypic mode strand stranding of sticising to become tombarthite high-iron aluminum alloy conductor 6, adopts oval tombarthite high-iron aluminum alloy monofilament to make things convenient for the production of tombarthite high-iron aluminum alloy monofilament on the one hand, and on the other hand can improve the compact type between the tombarthite high-iron aluminum alloy monofilament for can inseparable range between the tombarthite high-iron aluminum alloy monofilament, increase the quantity of tombarthite high-iron aluminum alloy monofilament in the unit area.
Example 1
The rare earth high-iron aluminum alloy monofilament comprises the following components in percentage by mass: 1.1 percent of iron, 0.02 percent of silicon, 0.03 percent of copper, 0.07 percent of manganese, 0.01 percent of magnesium, 0.01 percent of titanium, 0.07 percent of zirconium, 0.1 percent of chromium, 0.02 percent of strontium, 0.8 percent of rare earth, less than or equal to 0.1 percent of the total content of impurities and the balance of aluminum.
The rare earth element is cerium, lanthanum or a mixture of cerium and lanthanum.
The preparation method of the rare earth high-iron aluminum alloy cable comprises the following steps:
and S1, preparing materials, and weighing the raw materials according to the set chemical components for later use.
And S2, melting the aluminum ingot, and putting the aluminum ingot with the purity higher than 99.8% into a melting furnace for melting, wherein the melting temperature is 750 ℃, and preserving heat for 20min after melting.
And S3, smelting, adding the weighed raw materials into the heat-preserved aluminum liquid according to the component design, smelting in a smelting furnace, refining, degassing, and preserving heat after uniform smelting.
And S4, casting and forming, namely casting the smelted aluminum liquid and casting into aluminum strips.
And S5, rolling the cast aluminum strip by a rolling mill to form the rare earth high-iron aluminum alloy rod with phi 9 mm.
S6, drawing, namely drawing the rare earth high-iron aluminum alloy rod into an oval rare earth high-iron aluminum alloy monofilament by using a thirteen-die drawing machine; and twisting the rare earth high-iron aluminum alloy monofilament on a frame twist by adopting a special-shaped twisting die to form the rare earth high-iron aluminum alloy conductor 6.
S7, performing heat treatment, namely putting the rare earth high-iron aluminum alloy conductor 6 into an annealing furnace for annealing, wherein the annealing temperature is 300 +/-10 ℃, and the annealing time is 6 hours; after the rare earth high-iron aluminum alloy conductor 6 is naturally cooled, an inorganic mineral insulating fireproof layer 5 and a cross-linked polyethylene insulating layer 4 are wrapped outside the rare earth high-iron aluminum alloy conductor 6, then a flame-retardant layer 2 is wrapped outside the cross-linked polyethylene insulating layer 4, a ceramic fire-resistant silicon rubber layer 3 is filled between the flame-retardant layer 2 and the cross-linked polyethylene insulating layer 4, a halogen-free filling strip 7 is filled between the rare earth high-iron aluminum alloy conductor 6, and then the sheath 1 is sleeved to form the rare earth high-iron aluminum alloy fireproof cable.
The rare earth high-iron aluminum alloy cable monofilament prepared by the method has the elongation of 37 percent, the tensile strength of 121MPa, the bending frequency of 90 degrees of 38 times, the direct current resistivity of 0.028 at 20 ℃, the electric conductivity of 62.0 percent IACS and the bending radius of 7D, and compared with a copper cable, the rebound performance of the rare earth high-iron aluminum alloy cable monofilament is reduced by 40 percent, and compared with an aluminum core cable, the creep resistance of the rare earth high-iron aluminum alloy cable monofilament is increased by 300 percent.
Example 2
The rare earth high-iron aluminum alloy monofilament comprises the following components in percentage by mass: 1.3 percent of iron, 0.05 percent of silicon, 0.05 percent of copper, 0.03 percent of manganese, 0.02 percent of magnesium, 0.03 percent of titanium, 0.03 percent of zirconium, 0.08 percent of chromium, 0.03 percent of strontium, 1.0 percent of rare earth, less than or equal to 0.1 percent of the total content of impurities and the balance of aluminum.
The rare earth element is cerium, lanthanum or a mixture of cerium and lanthanum.
The preparation method of the rare earth high-iron aluminum alloy fireproof cable comprises the following steps:
and S1, preparing materials, and weighing the raw materials according to the set chemical components for later use.
And S2, melting the aluminum ingot, and putting the aluminum ingot with the purity higher than 99.8% into a smelting furnace for melting, wherein the melting temperature is 780 ℃, and preserving heat for 20min after melting.
And S3, smelting, adding the weighed raw materials into the heat-preserved aluminum liquid according to the component design, smelting in a smelting furnace, refining, degassing, and preserving heat after uniform smelting.
And S4, casting and forming, namely casting the smelted aluminum liquid and casting into aluminum strips.
And S5, rolling the cast aluminum strip by a rolling mill to form an aluminum alloy rod with phi 9 mm.
S6, drawing, namely drawing an aluminum alloy rod into an oval rare earth high-iron aluminum alloy monofilament by using a thirteen-die drawing machine; and twisting the rare earth high-iron aluminum alloy monofilament on a frame twist by adopting a special-shaped twisting die to form the rare earth high-iron aluminum alloy conductor 6.
S7, performing heat treatment, namely putting the rare earth high-iron aluminum alloy conductor 6 into an annealing furnace for annealing, wherein the annealing temperature is 300 +/-10 ℃, and the annealing time is 8 hours; after the rare earth high-iron aluminum alloy conductor 6 is naturally cooled, an inorganic mineral insulating fireproof layer 5 and a cross-linked polyethylene insulating layer 4 are wrapped outside the rare earth high-iron aluminum alloy conductor 6, then a flame-retardant layer 2 is wrapped outside the cross-linked polyethylene insulating layer 4, a ceramic fire-resistant silicon rubber layer 3 is filled between the flame-retardant layer 2 and the cross-linked polyethylene insulating layer 4, a halogen-free filling strip 7 is filled between the rare earth high-iron aluminum alloy conductor 6, and then the sheath 1 is sleeved to form the rare earth high-iron aluminum alloy fireproof cable.
The single wire of the aluminum alloy cable prepared by the method has the advantages of 39% of elongation, 128MPa of tensile strength, 39 times of 90-degree bending, 0.027 of direct current resistivity at 20 ℃, 65.0% of electrical conductivity IACS and 7D of bending radius, the rebound performance of the aluminum alloy cable is reduced by 40% compared with a copper cable, and the creep resistance of the aluminum alloy cable is increased by 300% compared with an aluminum core cable.
Example 3
The rare earth high-iron aluminum alloy monofilament comprises the following components in percentage by mass: 1.5 percent of iron, 0.07 percent of silicon, 0.08 percent of copper, 0.02 percent of manganese, 0.04 percent of magnesium, 0.08 percent of titanium, 0.02 percent of zirconium, 0.06 percent of chromium, 0.05 percent of strontium, 1.3 percent of rare earth, less than or equal to 0.1 percent of the total content of impurities and the balance of aluminum.
The rare earth element is cerium, lanthanum or a mixture of cerium and lanthanum.
The preparation method of the rare earth high-iron aluminum alloy cable comprises the following steps:
and S1, preparing materials, and weighing the raw materials according to the set chemical components for later use.
And S2, melting the aluminum ingot, and putting the aluminum ingot with the purity higher than 99.8% into a smelting furnace for melting, wherein the melting temperature is 780 ℃, and preserving heat for 20min after melting.
And S3, smelting, adding the weighed raw materials into the heat-preserved aluminum liquid according to the component design, smelting in a smelting furnace, refining, degassing, and preserving heat after uniform smelting.
And S4, casting and forming, namely casting the smelted aluminum liquid and casting into aluminum strips.
And S5, rolling the cast aluminum strip by a rolling mill to form the rare earth high-iron aluminum alloy rod with phi 9 mm.
S6, drawing, namely drawing the rare earth high-iron aluminum alloy rod into a runway type rare earth high-iron aluminum alloy monofilament by using a thirteen-die drawing machine; and twisting the rare earth high-iron aluminum alloy monofilament on a frame twist by adopting a special-shaped twisting die to form the rare earth high-iron aluminum alloy conductor 6.
S7, performing heat treatment, namely putting the rare earth high-iron aluminum alloy conductor 6 into an annealing furnace for annealing, wherein the annealing temperature is 300 +/-10 ℃, and the annealing time is 9 hours; after the rare earth high-iron aluminum alloy conductor 6 is naturally cooled, an inorganic mineral insulating fireproof layer 5 and a cross-linked polyethylene insulating layer 4 are wrapped outside the rare earth high-iron aluminum alloy conductor 6, then a flame-retardant layer 2 is wrapped outside the cross-linked polyethylene insulating layer 4, a ceramic fire-resistant silicon rubber layer 3 is filled between the flame-retardant layer 2 and the cross-linked polyethylene insulating layer 4, a halogen-free filling strip 7 is filled between the rare earth high-iron aluminum alloy conductor 6, and then the sheath 1 is sleeved to form the rare earth high-iron aluminum alloy fireproof cable.
The aluminum alloy cable monofilament prepared by the method has the advantages of 37% of elongation, 123MPa of tensile strength, 38 times of 90-degree bending, 0.028 of direct current resistivity at 20 ℃, 63.0% of IACS of electric conductivity and 7D of bending radius, the rebound performance of the aluminum alloy cable monofilament is reduced by 40% compared with a copper cable, and the creep resistance of the aluminum alloy cable monofilament is increased by 300% compared with an aluminum core cable.
Therefore, the fireproof cable prepared by the rare earth high-iron aluminum alloy fireproof cable and the preparation method thereof has the characteristics of good fire resistance and fireproof performance, and the service life of the cable is prolonged; and has the advantages of good conductivity, plasticity and creep resistance.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a tombarthite high-iron aluminum alloy fireproof cable which characterized in that: the cable comprises a rare earth high-iron aluminum alloy conductor and a protective layer, wherein at least two rare earth high-iron aluminum alloy conductors are arranged in the protective layer;
a fireproof layer and a first insulating layer are arranged outside the rare earth high-iron aluminum alloy conductor, the fireproof layer is positioned between the rare earth high-iron aluminum alloy conductor and the first insulating layer, and a second insulating layer is arranged between the first insulating layer and the protective layer;
the protective layer is provided with a concentric flame-retardant layer and a sheath in sequence from inside to outside, the sheath is located outside the flame-retardant layer, and a second insulating layer is arranged between the flame-retardant layer and the first insulating layer.
2. The rare earth high-iron aluminum alloy fireproof cable according to claim 1, characterized in that: the rare earth high-iron aluminum alloy conductor is formed by stranding a plurality of rare earth high-iron aluminum alloy monofilaments, and the rare earth high-iron aluminum alloy monofilaments are of an oval structure.
3. The rare earth high-iron aluminum alloy fireproof cable according to claim 1, characterized in that: the first insulating layer is a cross-linked polyethylene insulating layer, the second insulating layer is a ceramic fireproof silicone rubber layer, and the fireproof layer is an inorganic mineral insulating fireproof layer.
4. The rare earth high-iron aluminum alloy fireproof cable according to claim 1, characterized in that: the inside of inoxidizing coating is provided with 4 tombarthite high-speed railway aluminum alloy conductors, and 4 tombarthite high-speed railway aluminum alloy conductors are the circumference array around the axis of cable and distribute, are provided with between the tombarthite high-speed railway aluminum alloy conductor and do not have the steamed filler strip, do not have the steamed filler strip and set up with the cable is coaxial.
5. The rare earth high-iron aluminum alloy fireproof cable according to claim 2, wherein: the rare earth high-iron aluminum alloy monofilament comprises the following components in percentage by mass: 1.0 to 1.5 percent of iron, 0.03 to 0.08 percent of silicon, 0.02 to 0.08 percent of copper, 0.02 to 0.08 percent of manganese, 0.01 to 0.05 percent of magnesium, 0.01 to 0.08 percent of titanium, 0.01 to 0.08 percent of zirconium, 0.05 to 0.1 percent of chromium, 0.01 to 0.05 percent of strontium, 0.8 to 1.5 percent of rare earth, less than or equal to 0.1 percent of the sum of impurity contents and the balance of aluminum.
6. The rare earth high-iron aluminum alloy fireproof cable according to claim 5, wherein: the rare earth element is cerium, lanthanum or a mixture of cerium and lanthanum.
7. The method for preparing the rare earth high-iron aluminum alloy fireproof cable according to any one of claims 1 to 6, wherein the method comprises the following steps:
s1, preparing materials, and weighing the raw materials according to set chemical components for later use;
s2, melting aluminum ingots, namely putting the aluminum ingots with the purity higher than 99.8% into a melting furnace for melting, wherein the melting temperature is 750-;
s3, smelting, namely adding the weighed raw materials into the heat-preserved aluminum liquid according to the component design into a smelting furnace for smelting, refining and degassing, and preserving heat after uniform smelting;
s4, casting and forming, namely casting the smelted aluminum liquid to form an aluminum strip;
s5, rolling, namely rolling the cast aluminum strip by a rolling mill to form a rare earth high-iron aluminum alloy rod with phi 9 mm;
s6, drawing, namely drawing an aluminum alloy rod into an oval or runway rare earth high-iron aluminum alloy monofilament by using a thirteen-die drawing machine; twisting the rare earth high-iron aluminum alloy monofilament on a frame twist by adopting a special-shaped twisting die to form a rare earth high-iron aluminum alloy conductor;
s7, performing heat treatment, namely putting the rare earth high-iron aluminum alloy conductor into an annealing furnace for annealing, wherein the annealing temperature is 300 +/-10 ℃, and the annealing time is 6-9 h; after the rare earth high-iron aluminum alloy conductor is naturally cooled, wrapping an inorganic mineral insulating fireproof layer and a crosslinked polyethylene insulating layer on the outer portion of the rare earth high-iron aluminum alloy conductor, wrapping a flame-retardant layer on the outer portion of the crosslinked polyethylene insulating layer, filling a ceramic fire-resistant silicon rubber layer between the flame-retardant layer and the crosslinked polyethylene insulating layer, filling a halogen-free filling strip on the rare earth high-iron aluminum alloy conductor, and sleeving a sheath to form the rare earth high-iron aluminum alloy fireproof cable.
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