CN102181709A - Uniform dispersion method for boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles - Google Patents
Uniform dispersion method for boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles Download PDFInfo
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- CN102181709A CN102181709A CN 201110088768 CN201110088768A CN102181709A CN 102181709 A CN102181709 A CN 102181709A CN 201110088768 CN201110088768 CN 201110088768 CN 201110088768 A CN201110088768 A CN 201110088768A CN 102181709 A CN102181709 A CN 102181709A
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Abstract
The invention discloses a uniform dispersion method for boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles, and belongs to the field of study on uniform dispersion of boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles. According to the invention, an electromagnetic and mechanical preparation method is adopted and a double-blade-layer mechanical stirrer is used for performing uniform dispersion on the boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles under the condition that the radians of the concave arc surfaces of double-arc-shaped blades on the up and down layers in the thickness direction are respectively 57 to 59 degrees and 64 to 66 degrees, so the boron nitride particles are uniformly distributed and the uniform dispersion time can be shortened to 8 minutes 20 seconds.
Description
Technical field
The present invention relates to the homodisperse method of boron nitride particle in a kind of magnesium 6 zinc-15 boron nitride semi solid slurry.
Background technology
Publication number: CN1740369A, denomination of invention: on " a kind of preparation process of semi-solid Al 2 O-Sn slurry ", set forth the electromagnetism+mechanical preparation method of aluminium 20 tin semi solid slurry, promptly, utilize electromagnetic mixing apparatus to stir, smash the primary dendrite that forms in the aluminium 20 tin alloy liquid process of setting, by mechanical stirrer and move up and down control device, constantly aluminium 20 molten tin alloy around in the crucible are moved on to inside, aluminium 20 molten tin alloy of bottom are moved on to top, thereby progressively borne tin droplets is distributed in the aluminium 20 tin semi solid slurry.In this electromagnetism+mechanical preparation method, mechanical stirrer is single blade layer mechanical stirrer, adopt the individual layer blade, in effective contact range of blade and semi solid slurry, by blade borne tin droplets is applied dissipation of ferees, constantly borne tin droplets is distributed in the semi solid slurry, the radian of cancave cambered surface is 30～90 ° on the two arc shaped blade length directions of disclosed mechanical stirrer individual layer in patent CN1740369A, the radian of cancave cambered surface is under 45～90 ° of conditions on the thickness direction, single blade layer mechanical stirrer and moving up and down after the control device operation is homodisperse 15～20min can obtain the aluminium 20 tin semi solid slurry that borne tin droplets is evenly distributed.
Magnesium 6 zinc are that zinc content is the magnesium alloy of 6wt%, magnesium 6 zinc-15 boron nitride semi solid slurry is the semi solid slurry that contains 15wt% boron nitride particle and nascent solid phase particles of 85wt% and liquid phase, adopt the CN1740369A patented method, be that the radian of cancave cambered surface on 30～90 °, thickness direction is under 45～90 ° the condition at the radian of cancave cambered surface on the two arc shaped blade length directions of disclosed mechanical stirrer individual layer, need homodisperse after 14～17 minutes, just can obtain the magnesium 6 zinc-15 boron nitride semi solid slurry that boron nitride particle is evenly distributed.
Preparation for magnesium 6 zinc-15 boron nitride semi solid slurry, realizing under the equally distributed prerequisite of boron nitride particle, electromagnetic mixing apparatus and mechanical stirrer and the working time that moves up and down control device thereof are that the homodisperse time is short more, energy consumption is more little, cost is low more, and the pollution that magnesium 6 zinc-15 boron nitride semi solid slurry is subjected to is also few more, and its quality is high more, therefore can realize that the homodisperse time of equally distributed magnesium 6 zinc-15 of boron nitride particle boron nitride semi solid slurry is short more good more.
Summary of the invention
Technical problem to be solved by this invention is, overcome the deficiency of existing electromagnetism+mechanical preparation method " the homodisperse time is long ", provide a kind of and can realize the homodisperse method of boron nitride particle in the magnesium 6 zinc-15 boron nitride semi solid slurry fast, further shorten and realize the equally distributed homodisperse time of boron nitride particle.
The technical solution adopted for the present invention to solve the technical problems is: adopt electromagnetism+mechanical preparation method, utilize double leaf lamella mechanical stirrer, in cancave cambered surface arc minutes on the two arc shaped blade thickness directions of levels is not under the condition of 57～59 ° and 64～66 °, and magnesium 6 zinc-15 boron nitride semi solid slurry is carried out homodisperse.
The invention has the beneficial effects as follows: for the heavy particle in the melt, want to finish as early as possible its dispersion in melt, must strengthen disperseing intensity.In semi solid slurry electromagnetism+mechanical preparation method, if after the individual layer blade is implemented to disperse to the heavy particle in the semi solid slurry, and then utilize another layer blade to implement to disperse for the second time again, so, heavy particulate dispersion effect will be clearly better in the semi solid slurry, realize that the homodisperse time that heavy uniform particles distributes will further shorten, the present invention utilizes the continuous quadratic of the twi-tier blade after the optimum combination of cancave cambered surface radian on the two arc shaped blade thickness directions of levels to disperse, further promote the uniform distribution of heavy particle in semi solid slurry, thereby reached the purpose that shortens the homodisperse time.Utilize the present invention, magnesium 6 zinc-15 boron nitride semi solid slurry is carried out homodisperse, realize that the equally distributed homodisperse time of boron nitride particle can shorten to 8 minutes and 20 seconds, shortened 40% at least than the 14 minutes the shortest homodisperse time of adopting the CN1740369A patented method.
Description of drawings
Fig. 1 carries out the front view of homodisperse device to boron nitride particle in the magnesium 6 zinc-15 boron nitride semi solid slurry for the inventive method.
Among the figure, the tail rod 2 of mechanical stirrer, two arc shaped blades 3 of mechanical stirrer, ceramic crucible 4, heating tube 5, cooling tube 6, stop up 7, magnesium 6 zinc-15 boron nitride semi solid slurry 8, outer cover 9, loam cake 10, Ar tracheae 11, thermopair 12, orienting sleeve 13, motor 14, transmission rig 15, upper stroke switch 16, lower stroke switch 17, support 18.
Fig. 2 carries out the A-A view of homodisperse device to boron nitride particle in the magnesium 6 zinc-15 boron nitride semi solid slurry for the inventive method.
Among the figure, the electromagnetic pole of electromagnetic mixing apparatus is to 1.
Fig. 3 is the microtexture of the magnesium 6 zinc-15 boron nitride semi solid slurry that adopts the inventive method that boron nitride particle in the magnesium 6 zinc-15 boron nitride semi solid slurry is carried out to obtain behind the homodisperse.
Embodiment
As follows to specifying of boron nitride particle device in the inventive method homodisperse magnesium 6 zinc-15 boron nitride semi solid slurry in conjunction with the accompanying drawings:
The boron nitride particle device comprises in the homodisperse magnesium 6 zinc-15 boron nitride semi solid slurry: electromagnetic mixing apparatus, mechanical stirrer and move up and down control device, ceramic crucible 4, loam cake 10, stop up 7, outer cover 9, Ar tracheae 11 and thermopair 12.
The power of electromagnetic mixing apparatus is 10kW, its three pairs of electromagnetic poles are distributed on around the ceramic crucible 41, and between the crucible outer wall are 5mm apart from a, heating tube 5 and cooling tube 6 uniformly at intervals in the sidewall of crucible, be connected with the cooling fluid plenum system with external power source respectively, electromagnetic pole adds outer cover 9 to 1 outside;
Mechanical stirrer is a double leaf lamella mechanical stirrer, by square tail rod 2 and at interval b be that two blade layers up and down of 20mm constitute, material is a heat-stable ceramic, four identical pair of arc shaped blades 3 of other shape and corresponding distribution the cancave cambered surface radian difference on the vane thickness direction are respectively arranged in two blade layers, four two arc shaped blades 3 of lower floor, be positioned at tail rod 2 bottoms, four Surface Vertical of root and tail rod 2 and with it with wide, blade in the longitudinal direction, cancave cambered surface is a circular arc, circumferential movement direction in face of melt arranges that radian is 30～90 °; Blade is on thickness direction, and cancave cambered surface is circular arc up, radian is 64～66 °, arranges that in face of melt circumferential movement direction the lower surface of cancave cambered surface bottom and tail rod 2 is located in the same horizontal plane, its tangent line is parallel with sea line, and the distance c between blade outer end and the crucible inwall is 5mm; The cancave cambered surface radian is 57～59 ° on two arc shaped blade thickness directions on upper strata;
Mechanical stirrer moves up and down control device and is made of motor 14, transmission rig 15, upper stroke switch 16 and lower stroke switch 17.Transmission rig 15 is between mechanical stirrer tail rod 2 tops and motor 14, constitute by rack and pinion, turbine and worm drive, turning to of motor 14 by upper stroke switch 16 and lower stroke switch 17 controls, just, when the upper strata of mechanical stirrer blade is moved upwards up to semi solid slurry 8 tops, tail rod 2 touches upper stroke switch 16, and motor 14 changes turn to, and mechanical stirrer is moved down; When the lower leave of mechanical stirrer was moved down into ceramic crucible 4 bottoms, tail rod 2 touched lower stroke switch 17, and motor 14 changes turn to, and mechanical stirrer is moved up;
Mechanical stirrer move up and down speed control at 5～20mm/s, tail rod 2 relies on orienting sleeve 13 location, Ar tracheae 11 and thermopair 12 insert crucible by hole on the loam cake 10 and the hole between the mechanical stirrer blade, stop up 7 and be positioned at crucible bottom, motor 14, transmission rig 15, upper stroke switch 16, lower stroke switch 17, orienting sleeve 13 adopt mechanical connection manner to be fixed on the support 18.
Boron nitride particle homodisperse method in a kind of magnesium 6 zinc-15 boron nitride semi solid slurry, utilize electromagnetic mixing apparatus and mechanical stirrer and move up and down control device, constantly the boron nitride particle in the crucible is distributed in the magnesium 6 zinc melts, obtain equally distributed magnesium 6 zinc-15 of boron nitride particle boron nitride semi solid slurry, may further comprise the steps:
Step 1, preparation magnesium 6 zinc liquid, temperature is controlled at 730 ℃;
Step 2 is poured magnesium 6 zinc liquid and 230 purpose boron nitride particles in the ceramic crucible 4 into, and crucible is preheating to 530 ℃ by the heating tube in its wall 5, cover loam cake 10 after, connect Ar gas with anti-oxidation;
Step 3, start electromagnetic mixing apparatus and mechanical stirrer and move up and down control device, melt is stirred, simultaneously, close in the power supply of heating tube 5 and the cooling tube in sidewall of crucible 6 and to connect water coolant and cool off, melt is cooled to 460～540 ℃ of homodisperse temperature after, close water coolant, open and regulate the power supply of heating tube 5, make melt temperature be stabilized in this homodisperse temperature; Under this homodisperse temperature, behind the homodisperse certain hour, obtain the magnesium 6 zinc-15 boron nitride semi solid slurry 8 of homogeneous microstructure.
Embodiment one, in the speed of moving up and down of double leaf lamella mechanical stirrer is that 15mm/s, homodisperse temperature are that the cancave cambered surface radian is under 40 ° on 460 ℃, two arc shaped blade length direction, when the cancave cambered surface arc minutes was not 57 ° and 64 ° on the two arc shaped blade thickness directions of levels, the homodisperse time of equally distributed magnesium 6 zinc-15 of realization boron nitride particle boron nitride semi solid slurry was 8 minutes and 20 seconds.
Embodiment two, in the speed of moving up and down of double leaf lamella mechanical stirrer is that 5mm/s, homodisperse temperature are that the cancave cambered surface radian is under 30 ° on 460 ℃, two arc shaped blade length direction, when the cancave cambered surface arc minutes was not 57 ° and 66 ° on the two arc shaped blade thickness directions of levels, the homodisperse time of equally distributed magnesium 6 zinc-15 of realization boron nitride particle boron nitride semi solid slurry was 8 minutes and 10 seconds.
Embodiment three, in the speed of moving up and down of double leaf lamella mechanical stirrer is that 20mm/s, homodisperse temperature are that the cancave cambered surface radian is under 90 ° on 540 ℃, two arc shaped blade length direction, when the cancave cambered surface arc minutes was not 59 ° and 64 ° on the two arc shaped blade thickness directions of levels, the homodisperse time of equally distributed magnesium 6 zinc-15 of realization boron nitride particle boron nitride semi solid slurry was 8 minutes and 10 seconds.
Embodiment four, in the speed of moving up and down of double leaf lamella mechanical stirrer is that 10mm/s, homodisperse temperature are that the cancave cambered surface radian is under 90 ° on 540 ℃, two arc shaped blade length direction, when the cancave cambered surface arc minutes was not 59 ° and 66 ° on the two arc shaped blade thickness directions of levels, the homodisperse time of equally distributed magnesium 6 zinc-15 of realization boron nitride particle boron nitride semi solid slurry was 8 minutes and 20 seconds.
Embodiment five, in the speed of moving up and down of double leaf lamella mechanical stirrer is that 15mm/s, homodisperse temperature are that the cancave cambered surface radian is under 40 ° on 536 ℃, two arc shaped blade length direction, when the cancave cambered surface arc minutes was not 58 ° and 65 ° on the two arc shaped blade thickness directions of levels, the homodisperse time of equally distributed magnesium 6 zinc-15 of realization boron nitride particle boron nitride semi solid slurry was 8 minutes.
As seen, under cancave cambered surface radian on the two arc shaped blade thickness directions of the levels of double leaf lamella mechanical stirrer is 57～59 ° and 64～66 ° of conditions, magnesium 6 zinc-15 boron nitride semi solid slurry is carried out homodisperse, realize that the equally distributed homodisperse time of boron nitride particle can shorten to 8 minutes and 20 seconds.
Accompanying drawing 3 is the microtexture of the magnesium 6 zinc-15 boron nitride semi solid slurry that adopts the inventive method that boron nitride particle in the magnesium 6 zinc-15 boron nitride semi solid slurry is carried out to obtain behind the homodisperse.The light tone boxed area is a boron nitride particle among the figure, and grey sphere or elliposoidal zone are nascent solid phase particles, and other zone is that solid phase is given birth in the back, and as seen, boron nitride particle distributes very evenly.As seen, the present invention can realize the homodisperse of boron nitride particle in the magnesium 6 zinc-15 boron nitride semi solid slurry fast.
Claims (1)
1. boron nitride particle homodisperse method in the magnesium 6 zinc-15 boron nitride semi solid slurry, utilize electromagnetic mixing apparatus and mechanical stirrer and move up and down control device, constantly the boron nitride particle in the crucible is distributed in the magnesium 6 zinc melts, obtain equally distributed magnesium 6 zinc-15 of boron nitride particle boron nitride semi solid slurry, may further comprise the steps:
Step 1, preparation magnesium 6 zinc liquid, temperature is controlled at 730 ℃;
Step 2 is poured magnesium 6 zinc liquid and 230 purpose boron nitride particles in the ceramic crucible into, and crucible is preheating to 530 ℃ by the heating tube in its wall, cover loam cake after, connect Ar gas with anti-oxidation;
Step 3, start electromagnetic mixing apparatus and mechanical stirrer and move up and down control device, melt is stirred, simultaneously, close in the power supply of heating tube and the cooling tube in sidewall of crucible and to connect water coolant and cool off, melt is cooled to 460～540 ℃ of homodisperse temperature after, close water coolant, open and regulate the power supply of heating tube, make melt temperature be stabilized in this homodisperse temperature; Under this homodisperse temperature, behind the homodisperse certain hour, obtain the magnesium 6 zinc-15 boron nitride semi solid slurry of homogeneous microstructure;
It is characterized in that mechanical stirrer is a double leaf lamella mechanical stirrer, the radian of cancave cambered surface is respectively 57～59 ° and 64～66 ° on the two arc shaped blade thickness directions of its levels.
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| CN 201110088768 CN102181709A (en) | 2011-04-10 | 2011-04-10 | Uniform dispersion method for boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles |
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| CN 201110088768 CN102181709A (en) | 2011-04-10 | 2011-04-10 | Uniform dispersion method for boron nitride particles in semisolid slurry consisting of 5.1 weight percent of zinc, 79.9 weight percent of magnesium and 15 weight percent of boron nitride particles |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768979A (en) * | 2005-09-22 | 2006-05-10 | 北京交通大学 | Method for preparing QTi3.5-10 graphite semi-solid state slurry |
| CN201693159U (en) * | 2010-06-20 | 2011-01-05 | 浙江工贸职业技术学院 | Semisolid slurry stirring preparation device for light metal |
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- 2011-04-10 CN CN 201110088768 patent/CN102181709A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768979A (en) * | 2005-09-22 | 2006-05-10 | 北京交通大学 | Method for preparing QTi3.5-10 graphite semi-solid state slurry |
| CN201693159U (en) * | 2010-06-20 | 2011-01-05 | 浙江工贸职业技术学院 | Semisolid slurry stirring preparation device for light metal |
Non-Patent Citations (1)
| Title |
|---|
| 《热加工工艺》 19981231 王蕾 等 SiC颗粒增强铝基复合材料的研究 , 第3期 * |
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Application publication date: 20110914 |