CN108187564A - A kind of high-efficiency stirring method and device of no volume gas magnesium-aluminium oxide semi solid slurry - Google Patents

A kind of high-efficiency stirring method and device of no volume gas magnesium-aluminium oxide semi solid slurry Download PDF

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Publication number
CN108187564A
CN108187564A CN201810012198.3A CN201810012198A CN108187564A CN 108187564 A CN108187564 A CN 108187564A CN 201810012198 A CN201810012198 A CN 201810012198A CN 108187564 A CN108187564 A CN 108187564A
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China
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magnesium
graphite crucible
semi solid
solid slurry
volume
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CN201810012198.3A
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张伟
张伟一
杜云慧
张鹏
王玉洁
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Beijing Jiaotong University
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Beijing Jiaotong University
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Priority to CN201810012198.3A priority Critical patent/CN108187564A/en
Publication of CN108187564A publication Critical patent/CN108187564A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/451—Magnetic mixers; Mixers with magnetically driven stirrers wherein the mixture is directly exposed to an electromagnetic field without use of a stirrer, e.g. for material comprising ferromagnetic particles or for molten metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0036—Matrix based on Al, Mg, Be or alloys thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/26—Mixing ingredients for casting metals

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The invention discloses a kind of high-efficiency stirring method and devices of no volume gas magnesium aluminium oxide semi solid slurry, belong to the materials working research field such as metallurgical, casting, the present invention, which using inner wall is furnished with the variable volume graphite crucible of prismatic blade and stirs with high speed electromagnetic, to be combined mode magnesium aluminium oxide semi solid slurry is stirred；Utilize variable volume graphite crucible, empty all gas on semi solid slurry top, and then under conditions of completely cutting off completely with ambient atmos, it is stirred using high speed electromagnetic, generate circumferential high-speed stirred movement, utilize the prismatic blade on graphite crucible inner wall, prevent the downward precipitation of alumina particle and centrifugation segregation movement, so as to efficiently obtain the equally distributed magnesium aluminium oxide semi solid slurry of the alumina particle of no volume gas, mixing time can shorten to 2 minutes, solve the problems, such as volume gas and stirring efficiency low technical present in the stirring of magnesium aluminium oxide semi solid slurry.

Description

A kind of high-efficiency stirring method and device of no volume gas magnesium-aluminium oxide semi solid slurry
Technical field
The invention belongs to materials working research fields such as metallurgical, castings, more particularly to a kind of no volume gas magnesium-aluminium oxide half is solid The high-efficiency stirring method and device of state slurry.
Background technology
In the materials working research fields such as metallurgical, casting, it is often necessary to various melts are stirred, such as metal half Solid size, the stirring for adding particle melt etc., it is therefore an objective to make the homogenization such as temperature, ingredient, the tissue of melt.Stirring efficiency Stirring intensity is generally depended on, stirring intensity is bigger, and the shearing of formation and turbulent flow are stronger, and melt realizes temperature, ingredient, tissue etc. The mixing time of homogenization is shorter, and stirring efficiency is higher.However, strong stirring can lead to the volume gas problem of melt, easily High-temperature fusant oxidation, formation is caused to be mingled with tissue etc., even with protective atmosphere, volume gas can also make to spread stomata in melt, Material property is caused to deteriorate, it is seen then that volume gas problem has fettered the stirring intensity of melt, reduces stirring efficiency.Magnesium-aluminium oxide is multiple Condensation material contains the zinc of 6wt% or so and the alumina particle of 20wt% or so, has high specific strength, the Gao Bigang of magnesium matrix concurrently Degree, it is damping it is good, thermal fatigue property is good, electromagnetic shielding capability is strong and the hardness of alumina particle height, thermal stability is good, wear-resistant The advantages that, it is widely used in the fields such as aerospace, electronics industry, auto industry.Since 2054 DEG C of the fusing point of aluminium oxide is higher than 648 DEG C of the fusing point of magnesium, therefore aluminium oxide is existing in the form of solid granulates, in addition, due to aluminium oxide in magnesium liquid 3.9~4.1g/cm of density3More than 1.7~1.9g/cm of density of magnesium3, so, in the routine casting process of magnesium-alumina melt In, alumina particle easily precipitates.If semi solid slurry, the height of semi solid slurry is made in magnesium-alumina melt Viscosity and nascent solid phase particles effectively can prevent alumina particle from precipitating, still, the high viscosity of semi solid slurry and nascent solid phase Particle equally can also hinder the dispersion of alumina particle, therefore, to expeditiously prepare the equally distributed magnesium of alumina particle- Aluminium oxide semi solid slurry and then high performance magnesium-alumina composite material is obtained, must just increase and semi solid slurry is stirred Intensity is mixed, such volume gas problem just more highlights.Authorization Notice No. CN105436436B, Authorization Notice No. CN The patents of invention such as 103307900B by the methods of " narrow stir chamber in melt liquid level ", " setting melt disturbance isolator " come Barrier agitation transmits to melt liquid level, avoids melt volume gas.The angle that the present invention completely cuts off completely from melt and gas carries out Creativity and innovation in terms of semi solid slurry stirring has broken away from constraint of the volume gas to stirring intensity and stirring efficiency, can be expeditiously Prepare the equally distributed magnesium of the alumina particle without volume gas-aluminium oxide semi solid slurry.
Invention content
The technical problems to be solved by the invention are volume gas and stirring present in magnesium-aluminium oxide semi solid slurry stirring The low problem of efficiency provides a kind of high-efficiency stirring method and device of no volume gas magnesium-aluminium oxide semi solid slurry.
The technical solution adopted by the present invention to solve the technical problems is：
The variable volume graphite crucible that prismatic blade is furnished with using inner wall is combined mode to magnesium-aluminium oxide with high speed electromagnetic stirring Semi solid slurry is stirred；Using variable volume graphite crucible, by reducing the volume of graphite crucible, empty half in graphite crucible The all gas on solid size top, and under conditions of the isolation completely of semi solid slurry and ambient atmos, i.e., no gas Under conditions of source, the stirring of semi solid slurry is carried out, and then semi solid slurry volume gas is avoided from root；It is stirred using high speed electromagnetic It mixes, in the case where no volume gas fetters, magnesium-aluminium oxide semi solid slurry is made to generate circumferential high-speed stirred movement, utilizes graphite earthenware Prismatic blade on crucible inner wall, constantly by the magnesium of surrounding-aluminium oxide semi solid slurry move on to it is internal, by magnesium-aluminium oxide of lower part Semi solid slurry moves on to top, and then prevents the precipitation downwards of alumina particle and centrifugation segregation movement, so as to expeditiously obtain To the equally distributed magnesium of alumina particle-aluminium oxide semi solid slurry of no volume gas.
The beneficial effects of the invention are as follows：Using the present invention, magnesium-aluminium oxide semi solid slurry is stirred, it can be direct Prepare no volume gas, magnesium-aluminium oxide semi solid slurry that alumina particle is evenly distributed, mixing time can be shortened to 2 minutes, be stirred It mixes efficiency and improved 310% than 20 seconds 8 minutes disclosed in CN102181716A patent, solve magnesium-aluminium oxide semi solid slurry Volume gas present in stirring and stirring efficiency low technical problem.
Description of the drawings
Fig. 1 is the front view that the method for the present invention stirs magnesium-aluminium oxide production device for semisolid slurry.
In figure, graphite crucible 2, prismatic blade 3, heating tube 4, cooling tube 5, magnesium-aluminium oxide semi solid slurry 6, blocking 7, outside Cover 8, chassis 9, volume adjustment head 10, thermocouple 11, conical gas vent 12, blocking 13, trip bolt 14, spring 15, bearing shell 16, thrust bearing 17, motor 18, transmission mechanism 19, guide plate 20 connects slide plate 21, and buffer spring 22, connecting screw 23 leads To slot 24, rack 25, motor 26, transmission mechanism 27, stent 28.
Fig. 2 is the A-A views that the method for the present invention stirs magnesium-aluminium oxide production device for semisolid slurry.
In figure, electromagnetic pole is to 1.
Fig. 3 is the B-B views that the method for the present invention stirs magnesium-aluminium oxide production device for semisolid slurry.
Fig. 4 is the C-C views that the method for the present invention stirs magnesium-aluminium oxide production device for semisolid slurry.
Fig. 5 is the D-D partial views that the method for the present invention stirs magnesium-aluminium oxide production device for semisolid slurry.
Fig. 6 is the E-E partial views that the method for the present invention stirs magnesium-aluminium oxide production device for semisolid slurry.
Fig. 7 is the water quenching microstructure of magnesium-aluminium oxide semi solid slurry of the method for the present invention stirring.
Specific embodiment
The method of the present invention stirring magnesium-aluminium oxide production device for semisolid slurry is described as follows with reference to attached drawing：
As Figure 1-Figure 4, the Efficient Agitator of no volume gas magnesium-aluminium oxide semi solid slurry is mainly stirred by high speed electromagnetic It mixes device, graphite crucible 2 and its volume adjustment device and moves up and down device, thermocouple 11, blocking 7 and chassis 9 and form.
As shown in Figure 1, Figure 2, Figure 4 shows, three pairs of electromagnetic poles of high speed electromagnetic agitating device are distributed on to 1 around graphite crucible 2, The distance between 2 outer wall of graphite crucible is 5mm, and electromagnetic pole is to 1 outside plus outer cover 8.
As shown in Figure 1, Figure 2, Figure 3 shows, graphite crucible 2 is fixed on using mechanical connection manner on chassis 9, graphite crucible 2 Heating tube 4 and cooling tube 5 uniformly at intervals in wall are connect respectively with external power supply with cooling liquid supply system；In graphite crucible 2 Upper inside wall is machined with internal thread, cooperates with the external screw thread of 10 lower end of volume adjustment head；Graphite crucible 2 internal thread with Under inner wall on prismatic blade 3 is distributed with, connect using mechanical connection manner with the inner wall of graphite crucible 2.Prismatic blade 3 is in graphite earthenware It is distributed on 2 different height of crucible in horizontal layer, the interval a of the lower edge of undermost prismatic blade 3 and the inner bottom surface of graphite crucible 2 For 0~20mm, the interval b between adjacent prismatic blade layer is 0~20mm, by adjusting a and b, make top layer prismatic blade 3 it is upper The lowermost interval c at edge and 2 internal thread of graphite crucible is maintained at 0~10mm, the upper table of magnesium-aluminium oxide semi solid slurry 6 The lowermost distance d for being higher by 2 internal thread of graphite crucible upwardly is 5~10mm.In same prismatic blade layer, three prismatic blades It is 120 that 3 root position, which is distributed on the inner wall of graphite crucible 2 i.e. interval α angle,o, the length e of prismatic blade 3 is graphite crucible 2 Radius, width is 1/3rd of the radius of graphite crucible 2.On the length direction of each prismatic blade 3, prismatic blade 3 Incline on the basis of 2 horizontal circle center of graphite crucible is directed toward along the flow direction of magnesium-aluminium oxide semi solid slurry 6 on head Tiltedly, the angle β of prismatic blade 3 and the 2 horizontal circumference line of centres of its root and graphite crucible is 28o, so as to constantly by surrounding Magnesium-aluminium oxide semi solid slurry 6 moves on to inside；In the width direction of each prismatic blade 3, the upper blade of prismatic blade 3 relatively under Blade is tilted along the flow direction of magnesium-aluminium oxide semi solid slurry 6, the width direction of prismatic blade 3 and the angle γ of horizontal plane It is 37o, so that the magnesium in portion-aluminium oxide semi solid slurry 6 is moved on to top by continuous underground.Prismatic blade 3 in adjacent prismatic blade layer Interval δ angle of the root position on same level perspective plane be 60o。
As shown in Figure 1, Figure 4, Figure 5, the volume adjustment device of graphite crucible 2 is by volume adjustment head 10, blocking 13, fastening spiral shell Nail 14, spring 15 and driving device are formed, and are used to implement the volume adjustment of graphite crucible 2.Volume adjusts head 10, and material is stone Ink, upper part are round bar, and lower part is disk, and external screw thread is machined in disk side, the internal thread with 2 upper inside wall of graphite crucible It cooperates；Infundibulate gas vent 12 is equipped on disk.The rectangular tablet lower left quarter of blocking 13 is carried adjusts head 10 with volume Disk uniform thickness round platform, rectangular tablet right part is equipped with circular hole, and blocking 13 is limited in leakage by right part circular hole by trip bolt 14 In bucket shape gas vent 12, there is the gap of 1mm between the round platform of blocking 13 and infundibulate gas vent 12；Spring 15 is sleeved on trip bolt On 14 screw rod, effect is to jack up blocking 13, when screw-in reduces 2 volume of graphite crucible to volume adjustment head 10 downwards, just In the air discharge in graphite crucible 2；Rotate clockwise the rectangular handle at the top of trip bolt 14, the disk below handle The rectangular flat-plate compressed of blocking 13 is attached to the upper surface of volume adjustment 10 lower disk of head, seals infundibulate gas vent 12.It drives Dynamic device is made of motor 18, transmission mechanism 19 and detent mechanism, for volume adjustment head 10 to be driven to screw in downwards and rotation upwards Go out graphite crucible 2, be the key device for realizing the adjustment of 2 volume of graphite crucible；Transmission mechanism 19 is by turbine and worm screw, gear and tooth Wheel transmission is formed；Detent mechanism is located at the round bar top of volume adjustment head 10, and located lateral is carried out by upper and lower two bearing shells 16, by Upper and lower two thrust bearings 17 carry out longitudinal register；Motor 18, transmission mechanism 19 and the detent mechanism of driving device are respectively adopted Mechanical connection manner is fixed on guide plate 20, carries out moving down in the guide groove 24 that guide plate 20 can be on stent 28 be fixed on It is dynamic.
As shown in Fig. 1, Fig. 6, move up and down device by motor 26, transmission mechanism 27, connection slide plate 21, buffer spring 22, Connecting screw 23 is formed.Transmission mechanism 27 is made of rack 25 and gear, turbine and worm-drive, the lower end of rack 25 and connection Slide plate 21 is connected using mechanical connection manner.In the guide groove 24 that connection slide plate 21 can be on stent 28 be fixed on move down It is dynamic, and pass through buffer spring 22 and connecting screw 23 is connect with guide plate 20, volume is made to adjust above and below head 10 and its driving device It is mobile.In bearer connection screw rod 23, guide plate 20, volume adjustment head 10 and its driving device, thermocouple 11, blocking 13, fastening After the related components such as screw 14, spring 15, the decrement of buffer spring 22 is also greater than the maximum of 2 internal thread of graphite crucible Screw-in depth.Move up and down the motor 26 of device, transmission mechanism 27 is fixed on using mechanical connection manner on stent 28.
As Figure 1 and Figure 4, thermocouple 11 is fixed on volume adjustment head 10, lower end and magnesium-aluminium oxide semisolid Slurry 6 contacts, and stretches into 4mm in magnesium-aluminium oxide semi solid slurry 6, blocks 7 bottoms for being located at graphite crucible 2.
A kind of high-efficiency stirring method of no volume gas magnesium-aluminium oxide semi solid slurry, prismatic blade is furnished with using above-mentioned inner wall Variable volume graphite crucible is combined mode with high speed electromagnetic stirring and magnesium-aluminium oxide semi solid slurry is stirred；Utilize variant Product graphite crucible by reducing the volume of graphite crucible, empties all gas on semi solid slurry top in graphite crucible, and Under conditions of the isolation completely of semi solid slurry and ambient atmos, i.e., under conditions of no gas source, carry out semi solid slurry Stirring, and then semi solid slurry volume gas is avoided from root；It is stirred using high speed electromagnetic, in the case where no volume gas fetters, made Magnesium-aluminium oxide semi solid slurry generates circumferential high-speed stirred movement, constantly will be all using the prismatic blade on graphite crucible inner wall The magnesium enclosed-aluminium oxide semi solid slurry moves on to inside, the magnesium of lower part-aluminium oxide semi solid slurry is moved on to top, and then prevent The downward precipitation of alumina particle and centrifugation segregation movement, so as to which the alumina particle for efficiently obtaining no volume gas is uniformly distributed Magnesium-aluminium oxide semi solid slurry.Include the following steps：
Step 1, magnesium-alumina melt is prepared, temperature is controlled at 700 DEG C；
Step 2, above-mentioned magnesium-alumina melt to be poured into graphite crucible 2, the preheating temperature of graphite crucible 2 is 500 DEG C, Preheating is realized by the heating tube 4 in its wall；
Step 3, start and move up and down device, the external screw thread of 10 lower end of volume adjustment head is dropped into edge on graphite crucible 2 Internal thread at, closing move up and down device；Start the driving device of volume adjustment head 10, by the external screw thread of volume adjustment head 10 Screw in the internal thread of graphite crucible 2, when magnesium-alumina melt start round platform and infundibulate gas vent 12 along blocking 13 it Between gap, when being overflowed from the lower part of the rectangular tablet of blocking 13, close the driving device of volume adjustment head 10；It tightens clockwise Trip bolt 14 seals infundibulate gas vent 12, and melt is made to completely cut off completely with ambient atmos；
Step 4, thermocouple 11 is connected, using thermocouple 11 to external power supply and cooling liquid supply system input information, is adjusted Heating tube 4 and cooling tube 5 are saved, makes a certain temperature of the temperature stabilization of magnesium-alumina melt in 506~548 DEG C of solid-liquid two-phase region Degree starts high speed electromagnetic agitating device, carries out Isothermal stirring to magnesium-alumina melt, stablizes stirring 2 minutes；
Step 5, closing high-speed electromagnetic mixing apparatus unscrews trip bolt 14 counterclockwise, makes blocking 13 in the work of spring 15 It is bounced under, magnesium-aluminium oxide semi solid slurry 6 can be released by opening blocking 7, for using.
Fig. 7 is the water quenching microstructure of magnesium-aluminium oxide semi solid slurry of the method for the present invention stirring, and darker regions are in figure Magnesium matrix, wherein spherical in shape or elliposoidal part is nascent magnesium solid phase particles, light boxed area is alumina particle, can See there is no stomata on magnesium matrix, alumina particle is evenly distributed in magnesium matrix.
Embodiment one, the power of high speed electromagnetic agitating device is 20kW, rotating speed is 900 revs/min, magnesium-aluminium oxide melts Under conditions of the whipping temp of body is 506 DEG C, a 0mm, b 0mm, c 0mm, d are 5mm, after stablizing stirring 2 minutes, it can obtain To no volume gas, magnesium-aluminium oxide semi solid slurry 6 that alumina particle is evenly distributed, solid rate is 25%.
Embodiment two, the power of high speed electromagnetic agitating device is 20kW, rotating speed is 1200 revs/min, magnesium-aluminium oxide melts Under conditions of the whipping temp of body is 548 DEG C, a 20mm, b 20mm, c 10mm, d are 10mm, after stablizing stirring 2 minutes, It can obtain no volume gas, magnesium-aluminium oxide semi solid slurry 6 that alumina particle is evenly distributed, solid rate is 15%.
As it can be seen that under the premise of being emptied using variable volume graphite crucible and completely cutting off contact of the gas with semi solid slurry, and then Under high-power, high speed electromagnetic stirring condition, the method for the present invention can expeditiously prepare no volume gas, alumina particle is evenly distributed Magnesium-aluminium oxide semi solid slurry.

Claims (4)

  1. A kind of 1. high-efficiency stirring method of no volume gas magnesium-aluminium oxide semi solid slurry, which is characterized in that straight leaf is furnished with using inner wall The variable volume graphite crucible of piece is combined mode with high speed electromagnetic stirring and magnesium-aluminium oxide semi solid slurry is stirred；It utilizes Variable volume graphite crucible by reducing the volume of graphite crucible, empties all gas on semi solid slurry top in graphite crucible, And under conditions of the isolation completely of semi solid slurry and ambient atmos, i.e., under conditions of no gas source, carry out semi solid slurry The stirring of material, and then semi solid slurry volume gas is avoided from root；It is stirred using high speed electromagnetic, in the situation that no volume gas fetters Under, magnesium-aluminium oxide semi solid slurry is made to generate circumferential high-speed stirred movement, using the prismatic blade on graphite crucible inner wall, constantly The magnesium of surrounding-aluminium oxide semi solid slurry is moved on to inside, the magnesium of lower part-aluminium oxide semi solid slurry is moved on to top by ground, into And the downward precipitation of alumina particle and centrifugation segregation movement are prevented, it is equal so as to efficiently obtain the alumina particle of no volume gas The magnesium of even distribution-aluminium oxide semi solid slurry, includes the following steps：
    Step 1, magnesium-alumina melt is prepared, temperature is controlled at 700 DEG C；
    Step 2, above-mentioned magnesium-alumina melt is poured into graphite crucible, the preheating temperature of graphite crucible is 500 DEG C, by its wall Interior heating tube realizes preheating；
    Step 3, start and move up and down device, the external screw thread of volume adjustment head lower end is dropped to the internal thread on edge on graphite crucible Place, closing move up and down device；Start the driving device of volume adjustment head, volume adjustment head is screwed into graphite crucible Internal thread in, when magnesium-alumina melt start along between the round platform of blocking and infundibulate gas vent gap, from blocking When the lower part of rectangular tablet is overflowed, the driving device of volume adjustment head is closed；Trip bolt is tightened clockwise, infundibulate is deflated Mouth seals, and melt is made to completely cut off completely with ambient atmos；
    Step 4, thermocouple is connected, using thermocouple to external power supply and cooling liquid supply system input information, adjusts heating tube And cooling tube, make a certain temperature of the temperature stabilization of magnesium-alumina melt in 506~548 DEG C of solid-liquid two-phase region, start at a high speed Electromagnetic mixing apparatus carries out Isothermal stirring to magnesium-alumina melt, stablizes stirring 2 minutes；
    Step 5, closing high-speed electromagnetic mixing apparatus unscrews trip bolt counterclockwise, and blocking is made to bounce under the action of the spring, beats Magnesium-aluminium oxide semi solid slurry can be released by opening blocking, for using.
  2. 2. a kind of high-efficiency stirring method of no volume gas magnesium-aluminium oxide semi solid slurry according to claim 1, feature exist In the rotating speed of high speed electromagnetic agitating device is 900~1200 revs/min.
  3. 3. a kind of Efficient Agitator of no volume gas magnesium-aluminium oxide semi solid slurry, the device include：High speed electromagnetic stirring dress It puts, graphite crucible 2 and its volume adjustment device are with moving up and down device, thermocouple 11, blocking 7 and chassis 9；It is characterized in that：
    Internal thread is machined in the upper inside wall of graphite crucible 2, is cooperated with the external screw thread of 10 lower end of volume adjustment head；Graphite The volume adjustment device of crucible 2 is made of volume adjustment head 10, blocking 13, trip bolt 14, spring 15 and driving device, is used for Realize the volume adjustment of graphite crucible 2；Volume adjusts head 10, and material is graphite, and upper part is round bar, and lower part is disk, in circle Disc side is machined with external screw thread, cooperates with the internal thread of 2 upper inside wall of graphite crucible；Infundibulate is equipped on disk to deflate Mouth 12；The rectangular tablet lower left quarter of blocking 13 carries the round platform with the disk uniform thickness of volume adjustment head 10, and rectangular tablet right part is set There is circular hole, blocking 13 is limited in by trip bolt 14 in infundibulate gas vent 12 by right part circular hole, the round platform of blocking 13 and leakage There is the gap of 1mm between bucket shape gas vent 12；Spring 15 is sleeved on the screw rod of trip bolt 14, and effect is to jack up blocking 13, When screw-in reduces 2 volume of graphite crucible to volume adjustment head 10 downwards, convenient for the air discharge in graphite crucible 2；Clockwise The rectangular flat-plate compressed of blocking 13 can be attached to volume tune by the rectangular handle at the top of rotational fastener screw 14, the disk below handle The upper surface of whole 10 lower disk of head, seals infundibulate gas vent 12；Driving device is by motor 18, transmission mechanism 19 and positioning Mechanism is formed, and is to realize 2 volume of graphite crucible for volume adjustment head 10 to be driven to screw in downwards and screws out graphite crucible 2 upwards The key device of adjustment；Transmission mechanism 19 is made of turbine and worm screw, gear and gear drive；Detent mechanism is located at volume adjustment First 10 round bar top, located lateral is carried out by upper and lower two bearing shells 16, and longitudinal register is carried out by upper and lower two thrust bearings 17； Motor 18, transmission mechanism 19 and the detent mechanism of driving device are respectively adopted mechanical connection manner and are fixed on guide plate 20, lead It is moved up and down into the guide groove 24 that plate 20 can be on stent 28 be fixed on；Device is moved up and down by motor 26, driver Structure 27, connection slide plate 21, buffer spring 22, connecting screw 23 are formed；Transmission mechanism 27 is by rack 25 and gear, turbine and worm screw Transmission is formed, and the lower end of rack 25 is connected with connecting slide plate 21 using mechanical connection manner；Connection slide plate 21 can be fixed on branch It is moved up and down in guide groove 24 on frame 28, and passes through buffer spring 22 and connecting screw 23 is connect with guide plate 20, made Volume adjusts head 10 and its driving device moves up and down；In bearer connection screw rod 23, guide plate 20, volume adjustment head 10 and its drive After the related components such as dynamic device, thermocouple 11, blocking 13, trip bolt 14, spring 15, the decrement of buffer spring 22 is also It is greater than the maximum screw-in depth of 2 internal thread of graphite crucible；Move up and down the motor 26 of device, transmission mechanism 27 is connected using machinery The mode of connecing is fixed on stent 28.
  4. 4. a kind of Efficient Agitator of no volume gas magnesium-aluminium oxide semi solid slurry according to claim 3, feature exist Face upward in the upper table of, magnesium-aluminium oxide semi solid slurry 6 be higher by the lowermost distance d of 2 internal thread of graphite crucible for 5~ 10mm。
CN201810012198.3A 2018-01-05 2018-01-05 A kind of high-efficiency stirring method and device of no volume gas magnesium-aluminium oxide semi solid slurry Withdrawn CN108187564A (en)

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Application publication date: 20180622