CN101220449A - Fire resistant iron chromium aluminum filament and production technique - Google Patents
Fire resistant iron chromium aluminum filament and production technique Download PDFInfo
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- CN101220449A CN101220449A CNA2008100305466A CN200810030546A CN101220449A CN 101220449 A CN101220449 A CN 101220449A CN A2008100305466 A CNA2008100305466 A CN A2008100305466A CN 200810030546 A CN200810030546 A CN 200810030546A CN 101220449 A CN101220449 A CN 101220449A
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Abstract
The invention relates to a high temperature resistant iron-chromium-aluminum fiber yarn and a preparing process, belongs to the field of stainless steel processing and obtains the iron-chromium-aluminum fibers by bundle drawing iron-chromium-aluminum wire rods embedded in base materials; the iron-chromium-aluminum fibers comprise iron and the following components (represented by wt. percent) of more than or equal to 0.005 percent and less than or equal to 0.03 percent of C, more than or equal to 15 percent and less than or equal to 27 percent of Cr, more than or equal to 5.95 percent and less than or equal to 7.0 percent of Al, more than or equal to 0.05 percent and less than or equal to 0.2 percent of Cu, more than or equal to 0.4 percent and less than or equal to 0.6 percent of Si, more than or equal to 0.2 percent and less than or equal to 0.4 percent of Mn, more than or equal to 0.03 percent and less than or equal to 0.04 percent of S, more than or equal to 0.010 percent and less than or equal to 0.045 percent of P and more than or equal to 0.01 percent and less than or equal to 0.04 percent of RE; the manufacturing process comprises the following procedures of material choosing, pretreatment, encapsulation, compaction, drawing, separation and rolling. The manufacturing process of the iron-chromium-aluminum fiber of the invention is suitable for drawing and processing high-aluminum iron-chromium-aluminum wire rods and can reach the yield of 98 percent with little influence on the environment.
Description
Technical field:
The present invention relates to a kind of fire resistant iron chromium aluminum filament.The invention still further relates to by the siderochrome aluminium wire is carried out the preparation method that the boundling drawing obtains fire resistant iron chromium aluminum filament.
Background technology:
At present, three class alloys such as Ni-Cr, Fe-Cr-Al and Fe-Mo-W are the metal carrier materials that can be used as automobile exhaust purifier.Take all factors into consideration from processing characteristics and economic worth etc., Fe-Cr-Al is the alloy that application prospect is arranged most.Along with the sharp increase of China's automobile pollution, the pollution that automotive emission causes is also more and more serious, to the demand of the iron-chromium-aluminum that can be used for purifying vehicle exhaust also in cumulative year after year.Simultaneously, consider from the angle of energy-conservation and environmental protection, also to having higher requirement the work-ing life of iron-chromium-aluminum.Studies show that the Al that the iron-chromium-aluminum surface optionally forms in a large number
2O
3The adhesion property quality of the homogeneity of film, internal stress and it and matrix is that the decision iron-chromium-aluminum is in the hot conditions important factor in following work-ing life.Therefore, the increase of aluminium content is very favourable to the work-ing life that prolongs carrier in the iron-chromium-aluminum.But along with the increase of aluminium content, the work brittleness of Aludirome will be aggravated.In fact, when aluminium content surpassed 5.5wt.%, the low problem of processing ubiquity recovery rate significantly increased tooling cost, therefore generally all can only be controlled at the aluminium content of this alloy in the 5.5wt%.
A kind of name is called " a kind of metal fiber wire and manufacture craft thereof ", application number is: 200610086041.2 patent of invention, disclose its composition and comprised following component (representing): carbon: 0.03-0.08% with wt.%, manganese: 0.20-0.46%, silicon: 0.40-0.63%, rare earth metal cerium or lanthanum: 0.02-0.10%, aluminium: 4.8-5.9%.Chromium: 15-26%, copper: 0.05-2.0%, sulphur: 0.03-0.04%, phosphorus: 0.04-0.05%, iron: 66-81%.Its manufacture craft comprises following operation successively: charging, plating, tubulature, directly pull out, drawing, annealing, insulation, coiling, pickling, cleaning, oven dry, warehouse-in.The steel fiber vermicelli production technique of this invention, though suitable drawing processing, its yield rate is lower, the work-ing life of the iron-chromium-aluminum that makes is also unsatisfactory.Simultaneously, the steel fiber vermicelli production technique of this invention, the annealing passage is too many and be difficult to operation, produces a large amount of obnoxious flavoures during pickling, and the production cost height is so be difficult to realize scale operation.
Summary of the invention
An object of the present invention is to provide a kind of fire resistant iron chromium aluminum filament, this iron-chromium-aluminum has more reliable performance in whole length of fiber and circumference range, intensity and unit elongation all to improve greatly, especially have excellent high temperature oxidation resistance more.
It is simpler that another object of the present invention aims to provide technology, and a kind of preparation technology of fire resistant iron chromium aluminum filament efficiently can improve the lumber recovery of iron-chromium-aluminum widely.
The objective of the invention is to realize by following manner:
A kind of fire resistant iron chromium aluminum filament, comprise following weight percent composition: 0.005%≤C≤0.025%, 15%≤Cr≤27%, 5.95%≤Al≤7.0%, 0.05%≤Cu≤0.2%, 0.4%≤Si≤0.6%, 0.2%≤Mn≤0.4%, 0.03%≤S≤0.04%, 0.010%≤P≤0.045%, 0.01%≤RE≤0.04%, surplus are iron; Described filametntary equivalent diameter is 1.5-100um, and diameter tolerance is in the scope of 0.5-1um, and the length range of iron-chromium-aluminum is 1-4 * 10
5M.
The axle of described fire resistant iron chromium aluminum filament fiber heavily is controlled in the scope of 0.1-100Kg.
The equivalent diameter scope of the iron-chromium-aluminum that obtains according to the present invention is 1.5-100um, preferred 5-50um, and diameter tolerance is in the scope of 0.5-1um.Equivalent diameter is defined as a kind of imaginary circular diameter, and the surface-area of this imaginary circle is long-pending identical with the cross-sectional surface of iron-chromium-aluminum.The length range of the iron-chromium-aluminum that obtains according to the present invention is 1-4 * 10
5M, preferred 1 * 10
2-1 * 10
4M, so heavy can being controlled in the scope of 0.1-100Kg of fiber, preferred 5-10Kg.The iron-chromium-aluminum surfaces A l that obtains according to the present invention
20
3The adhesion property of the homogeneity of film, internal stress and it and matrix is better, thereby has obtained the good high-temperature antioxidant property.
Compare with the iron-chromium-aluminum that obtains by the boundling drawing known in the art, iron-chromium-aluminum overall performance according to the present invention is better, aluminium content is higher, the intensity and the unit elongation of iron-chromium-aluminum are improved greatly, and the performance along the staple length direction is basic identical, and has basic composition uniformly.For example, when filament diameter was 22um, diameter tolerance can be controlled in the scope of 0.5-1um, and tensile strength can reach 1579MPa, and unit elongation reaches 1.70%, the axle 10Kg that weighs.
In addition, the alloy as the iron-chromium-aluminum of theme of the present invention has the following advantages:
Carbon content of the present invention is 0.005%-0.025%, and carbon content is lower than 0.025%, can prevent effectively that the material after the drawing from becoming fragile.Aluminium content of the present invention is 6.0%-7.0%, thereby can obtain good high-temperature oxidation resistance.Rare earth cerium or lanthanum content are 0.01%-0.04%, also make product of the present invention have more excellent high-temperature oxidation resistance.
Adopt above-mentioned alloy, can under the situation that does not need intermediate heat treatment, during the drawing complex line, make the deflection Δ ε of complex line be higher than 80%, for example 85% or even 90%.
Deflection Δ ε is defined as the final cross-sectional area S of complex line
2With the long-pending S of the initial cross sectional of complex line
1Poor, again with the long-pending S of the initial cross sectional of complex line
1The value of ratio.
Initial cross sectional is amassed S
1Refer to after thermal treatment but the cross-sectional area of complex line before further drawing final cross-sectional area S
2Refer in distortion (drawing) and measure S afterwards and before next heat treatment step (if there is)
2
Another object of the present invention has provided a kind of preparation method of iron-chromium-aluminum.The method according to this invention may further comprise the steps:
1. pre-treatment: at raw material siderochrome aluminium wire electroplating surface metallizing or physics coated non-metallic sealing coat, the preparation composite filament;
2. encapsulation: adopt the packaged material encapsulation to be embedded into the siderochrome aluminium wire of matrix, form a kind of matrix material;
3. compacting: the matrix material compacting after will encapsulating is a complex line;
4. drawing: the complex line after the compacting is through repeatedly tube reducing drawing and annealing become the finished product complex line;
5. separate: the finished product complex line adopts the isolating mode of electrochemistry, removes encapsulation and body material, finally obtains iron-chromium-aluminum;
6. rolling: with the fiber wire coiler rolling after the electrochemistry separation;
Drawing of described repeatedly tube reducing and annealing are with after the drawing of complex line tube reducing, are sent in the annealing furnace, are incubated 10-30 minute down at 600-900 ℃, place air to cool off on the annealed composite line then, enter into down drawing procedure one, repetitive operation 3-5 time.
Step 1. in, the siderochrome aluminium wire is provided, contain iron and following compositions (representing): 0.005%≤C≤0.03%, 15%≤Cr≤27%, 5.95%≤Al≤7.0% in the composition of this wire rod with wt.%, 0.05%≤Cu≤0.2%, 0.4%≤Si≤0.6%, 0.2%≤Mn≤0.4%, 0.03%≤S≤0.04%, 0.010%≤P≤0.045%, 0.01%≤RE≤0.04%.The siderochrome aluminium wire that provides or the diameter of wire rod are preferably 0.2-20mm.
Step 2. in, by in junior one step, at Fe-Cr-Al wire material surface metallization or nonmetal sealing coat, this layer metal or nonmetal can be called " body material ", the siderochrome aluminium wire just is embedded in the body material like this, and the thickness of this layer for example is 1um-2mm." body material " is the material that is applied in order to carry out the boundling drawing process on each siderochrome aluminium wire.This body material for example can be copper, iron or copper alloy or iron alloy.The Fe-Cr-Al wire material is embedded in the body material, can be called " composite filament ".
Step 3. in, be embedded in siderochrome aluminium wire bundle in the body material after, again it is encapsulated.Packaged material is defined as being applied with the material that applies on the siderochrome aluminium wire bundle of body material thereon.This packaged material for example can be copper, iron or copper alloy or iron alloy.
Step 4. in, surface-area according to the siderochrome aluminium wire bundle that is applied with body material, calculate the diameter of compacting, choose suitable alloy mould and carry out compacting, behind packed in this embedding body material again the siderochrome aluminium wire bundle of compacting be known as " complex line ".Like this, just siderochrome aluminium wire and packaged material are combined, formed a branch of.
Step 5. in, following operation hockets: reduce the complex line diameter, the complex line thermal treatment that diameter is reduced, and carry out final diameter and reduce, final deflection makes complex line obtain final diameter.The present invention reduces diameter by rolling operation.The mode of continuous heat treatment is adopted in every time thermal treatment, may further comprise the steps: a. sends into complex line in the annealing furnace, the temperature controller temperature is set to 600-900 ℃, is incubated 10-30 minute, concrete temperature and soaking time according to variant production specification requirement adjust.B. after reaching the temperature and time of specified requirement, the complex line that finishes annealing places air to cool off, and delivers to down drawing procedure again one.(but not necessarily) possibly is higher than 80% deflection Δ ε in whole drawing steps employings.(but not necessarily) possibly after final diameter reduces, carries out a thermal treatment to the finished product complex line.
Step 6. in, electrochemistry separate to adopt continuous YIN YANG interdislocation syndrome for electrolysis, adopts sulphuric acid soln as the electrochemical solution system, the concentration of sulphuric acid soln is 0.7-1.4mol/L.In electrolytic separation process, electrolysis voltage adopts constant voltage control, and voltage control is at 3-4V.Different according to matrix and packaged material, the isolating speed of control complex line is 0.8-1.2m/min.
Step 7. in, the rolling speed of wire coiler can be adjusted in the scope of 30-60m/min according to concrete iron-chromium-aluminum specification.
For the iron-chromium-aluminum of present known production in enormous quantities, this deflection Δ ε keeps below 70%, perhaps even be lower than 60%, and will carry out a large amount of thermal treatment in drawing process.Even so, the lumber recovery of iron-chromium-aluminum is still lower, can only reach 50%, perhaps even be lower than 40%.The present invention compared with prior art, have obvious improvement and substantive distinguishing features: the present invention is by the improvement to drawing process, in drawing process, adopt optimized heat treatment mode and technology, solved problem such as fracture and quality instability in the drawing process, the lumber recovery of iron-chromium-aluminum is brought up to more than 98%, and having realized scale operation, annual production is more than 500 tons.The iron-chromium-aluminum that adopts method of the present invention to make, the intensity and the unit elongation of iron-chromium-aluminum are improved greatly.
Description of drawings:
Fig. 1 is that diameter is the Photomicrograph of cross section of the complex line of 1.2mm after drawing, tangible interface is arranged as can be seen from Figure 1, between the composite filament in drawing process, though the surface deformation of complex line is big, but internal modification is little and inhomogeneous, and the shape of composite filament has not been circular.
Fig. 2 is that diameter is the Photomicrograph of the iron-chromium-aluminum of 22um, and as can be seen from Figure 2, there is the part small-particle on the fiber sample surface, but surface condition is similar along its length.
Figure 3 shows that process flow sheet of the present invention;
Embodiment:
The following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Table 1 shows the composition according to iron-chromium-aluminum of the present invention.
The composition of table 1 iron-chromium-aluminum of the present invention
| C (wt％) | Cr (wt％) | Al (wt％) | Cu (wt％) | Si (wt％) | Mn (wt％) | S (wt％) | P (wt％) | RE (wt％) | |
| A B C D E | 0.022 0.024 0.024 0.020 0.015 | 20.36 20.48 20.65 20.31 20.69 | 5.95 6.12 6.58 6.70 7.0 | 0.058 0.050 0.065 0.049 0.049 | 0.20 0.24 0.21 0.21 0.21 | 0.16 0.17 0.17 0.16 0.16 | 0.017 0.016 0.016 0.017 0.017 | 0.015 0.018 0.010 0.010 0.010 | 0.029 0.017 0.035 0.035 0.035 |
Iron-chromium-aluminum as theme of the present invention can provide by using following optimum seeking method,
1. providing diameter in step in is 0.2-20mm, for example 0.37mm and have siderochrome aluminium wire according to the composition of one of above-mentioned example.Step 2. in, apply layer of copper by electrolysis for example and come described siderochrome aluminium wire is applied.Preferably, this layer thickness is 3-100um, for example 20um.Step 3. in, with several, for example the wire rod after 500 coatings is encapsulated in the iron cover.As a result, step 4. in, be the complex line of 15.6mm with the composite wire compacting.Step 5. in, this complex line adopts and is higher than 10%, for example several Δ ε of 40% (for example Δ ε 1, Δ ε 2) diameter that hockets reduces, and then under 600-900 ℃, for example carries out the then continuous annealing of a complex line of a complex line under 800 ℃.This heat treatment time is 10-30 minute, for example 20 minutes.Final diameter reduces to adopt and is higher than the diameter that 70% Δ ε reduces described complex line, and this final diameter reduces to make complex line to have final diameter.At last, step 6. in, be the sulfuric acid of 0.8mol/L for example by adopting concentration, voltage is 4V, the isolating speed of complex line is 1m/min, removes body material and packaged material.Having obtained diameter is the iron-chromium-aluminum of 5-25um, for example 12um or 8um.Step 7. in, the rolling speed setting of wire coiler is that 30m/min carries out rolling.The diameter tolerance of the iron-chromium-aluminum of the 12um that obtains is in the scope of 0.5-0.8um, and the length of fiber is 1 * 10
3-1 * 10
4M, fiber the axle heavily be controlled in the scope of 6-7Kg, iron-chromium-aluminum tensile strength be 1239MPa, unit elongation is 1.2%, the tensile strength of the iron-chromium-aluminum of 8um is 1027MPa, unit elongation is 0.5%.
Table 2 shows the performance according to iron-chromium-aluminum of the present invention.
| Core number and diameter (um) | Diameter tolerance (um) | Length (m) | Axle heavy (Kg) | Tensile strength (MPa) | Unit elongation (%) |
| 1700×8um 1500×12um 500×22um 275×35um | 0.5-0.7 0.5-0.8 0.5-0.9 0.5-1.0 | 1×10 3-1×10 4 1×10 3-1×10 4 1×10 2-1×10 3 1×10 2-1×10 3 | 6-7 6-7 8-9 8-9 | 1027 1239 1345 1650 | 0.5 1.22 1.53 1.61 |
Those skilled in the art can make replacement, distortion according to the present invention, only otherwise break away from basic thought of the present invention, and all within the scope of the present invention.
Claims (7)
1. fire resistant iron chromium aluminum filament, it is characterized in that: become to be grouped into by following weight percent: 0.005%≤C≤0.025%, 15%≤Cr≤27%, 5.95%≤Al≤7.0%, 0.05%≤Cu≤0.2%, 0.4%≤Si≤0.6%, 0.2%≤Mn≤0.4%, 0.03%≤S≤0.04%, 0.010%≤P≤0.045%, 0.01%≤RE≤0.04%, surplus are iron; Described filametntary equivalent diameter is 1.5-100um, and diameter tolerance is in the scope of 0.5-1um, and the length range of iron-chromium-aluminum is 1-4 * 10
5M.
2. a kind of fire resistant iron chromium aluminum filament according to claim 1 is characterized in that: described filametntary axle heavily is controlled in the scope of 0.1-100Kg.
3. a kind of fire resistant iron chromium aluminum filament according to claim 1 is characterized in that: described filametntary equivalent diameter is 5-50um
4. according to claim 1 or 3 described a kind of fire resistant iron chromium aluminum filaments, it is characterized in that: the length range 1 * 10 of described fiber
2-1 * 10
4M, the heavy 5-10Kg of the axle of fiber.
5. the technology of a fire resistant iron chromium aluminum filament is characterized in that, may further comprise the steps:
1. pre-treatment: at raw material siderochrome aluminium wire electroplating surface metallizing or physics coated non-metallic sealing coat, the preparation composite filament;
2. encapsulation: adopt the packaged material encapsulation to be embedded into the siderochrome aluminium wire of matrix, form a kind of matrix material;
3. compacting: the matrix material compacting after will encapsulating is a complex line;
4. drawing: the complex line after the compacting is through repeatedly tube reducing drawing and annealing become the finished product complex line;
5. separate: the finished product complex line adopts the isolating mode of electrochemistry, removes encapsulation and body material, finally obtains iron-chromium-aluminum;
6. rolling: with the fiber wire coiler rolling after the electrochemistry separation;
Drawing of described repeatedly tube reducing and annealing are with after the drawing of complex line tube reducing, are sent in the annealing furnace, are incubated 10-30 minute down at 600-900 ℃, place air to cool off on the annealed composite line then, enter into down drawing procedure one, repetitive operation 3-5 time.
6. the technology of a kind of fire resistant iron chromium aluminum filament according to claim 5, it is characterized in that, step 5. in, described electrochemistry is separated and is adopted continuous YIN YANG interdislocation syndrome for electrolysis, adopt sulphuric acid soln as the electrochemical solution system, the concentration of sulphuric acid soln is 0.7-1.4mol/L; Electrolysis voltage adopts constant voltage control, and voltage control is at 3-4V; The isolating speed of control complex line is 0.8-1.2m/min.
7. the technology of a kind of fire resistant iron chromium aluminum filament according to claim 5 is characterized in that, step 7. in, the rolling speed of wire coiler is adjusted in the scope of 30-60m/min.
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| CN108672706A (en) * | 2018-05-11 | 2018-10-19 | 娄底市格林新材料科技有限公司 | A kind of preparation process of stainless steel fibre micro mist |
| CN108672706B (en) * | 2018-05-11 | 2021-11-26 | 娄底市格林新材料科技有限公司 | Preparation process of stainless steel fiber micro powder |
| CN109175363A (en) * | 2018-08-31 | 2019-01-11 | 湖南惠同新材料股份有限公司 | A kind of method that discharge plasma sintering prepares metallic fiber sintered felt |
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