CN104911417B - High-purity aluminum magnesium alloy plate ingot for mechanical hard disk, and production method thereof - Google Patents
High-purity aluminum magnesium alloy plate ingot for mechanical hard disk, and production method thereof Download PDFInfo
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Abstract
The invention discloses a high-purity aluminum magnesium alloy plate ingot for a mechanical hard disk, and a production method thereof. The produced plate ingot can meet the requirement of a high-capacity substrate. The plate ingot comprises the following alloy components in percentage by mass: less than or equal to 18.6 percent of Mg, less than or equal to 0.005 percent of Si, less than or equal to 0.005 percent of Fe, 0.005-0.01 percent of Cu, less than or equal to 0.0015 percent of Mn, less than or equal to 0.009 percent of Cr, 0.008-0.016 percent of Zn, less than or equal to 0.005 percent of Ti, less than or equal to 0.001 percent of Na, less than or equal to 0.01 percent of other impurities and the balance of aluminum. The production method comprises the steps of smelting, refining and purifying, casting and post-processing the plate ingot. The high-purity aluminum magnesium alloy plate ingot for the mechanical hard disk is produced by a semi-continuous casting method, so the plate ingot has the characteristics of stable and reliable process, high operability, high purity and the like; and by the stable process, the subsequent influence factors and parameters of the product can be adjusted and controlled, and scale production can be realized.
Description
Technical field
The present invention relates to material and the production method thereof of magnetic memory element, particularly a kind of mechanical type hard disk is with high-purity
Almag plate ingot and production method thereof.
Background technology
Hard disk aluminium substrate is one of important development direction of aluminum base magnetic memory materials.Hard disc is that HDD is (hard
Disk drive) in the core component of storage information, hard disk is to be added together by multiple disc pack, from each other by
Packing ring separates, and the storage function in hard disk is mainly realized by disc therein, and hard disc is with robust
Material is basal disc, and magnetic coating material thick for 80nm the most altogether is attached on substrate, it is achieved the storage of data.
Hand disk wafer material is one of core component of hard disk drive, its production and processing relate to preliminary working, polish and
Coating prepares three main technique, for the production of substrate blank mainly by melting → casting → hot rolling → cold
Roll → punching press → annealing, finally give satisfactory aluminium substrate, generally almag composition.
The production technology of mechanical type hard disk aluminium substrate is mainly in Japan at present, in JP 61-91352 public affairs
In report, disclose a kind of method for annealing relating to magnetic disc substrate aluminium alloy plate, mainly provide and be more suitable for magnetic
The aluminium alloy plate of base-board for plate its for be 3～6wt% containing the Mg magnetic disc substrate of (wt% mass fractions, lower with)
Use aluminium alloy plate.In Unexamined Patent 4-99143 publication, describe one NiP layer is coated in aluminium alloy table
The hard disk in the face report of almag substrate, containing Mg 3.0-5.0 in the composition of substrate, Fe, Si, Cu,
Zn is less than 0.05, is 50～400ppm containing Ga, and Be is 0.5～100ppm, more than 7 μm
Intermetallic compound be 10/mm2Below.One is had to relate to described in Unexamined Patent 2-205651 publication
And the invention of magnetic disc substrate aluminium alloy, it is 1-8 containing Mg, Si and the Fe limit contained as impurity element
System is below ormal weight, and Ga is limited in below 150ppm.No. 3875175 public affairs of Japanese Patent No.
Having an invention relating to aluminium alloy base plate for magnetic disk described in report, it contains Mg is 3.0-6.0, containing Zn
For 0.25-1.0, the content of Cu and Cr, Fe and the Si that contain ormal weight in addition is limited in 0.05 matter respectively
Amount below %.The representative invention of above Japanese Laid-Open is also not directed to related substrate plate ingot and
Manufacture method, the almag substrate for hard disk has particularity because of its special effect, its composition.
For the mechanical type hard disk production technology of almag substrate, in Kobe Steel of Amada Co., Ltd. place
The patent of state's application, patent publication No.: CN101381828B, disclose a kind of excellent strength, and improve
The aluminium alloy base plate for magnetic disk of NiP plating rear surface flatness and manufacture method thereof.Aluminium alloy base plate for magnetic disk profit
By thin plate continuous casting process, the motlten metal of aluminium alloy being made sheet material, this aluminium alloy contains 3.5-15wt%'s
Mg；Si and Fe containing 0.01-0.1；The Cr write containing 0.02-0.35 mass；Cu, Zn possibly together with ormal weight
At least one.The sheet material of the punch press process high temperature in 300 DEG C and (14.7 [Mg]+204) DEG C will be have passed through
Above after (the Mg content (quality %) in [Mg] aluminium alloy) pressurization annealing, carry out with more than fixing speed cooling
Planarizing, the greatest length of the Al-Fe series intermetallic compound on surface is between below 7 μm, Mg-S i system metal
The greatest length of compound is below 4 μm, A13Mg2The area occupation ratio of phase is less than 1%.
The patent of place China of Kobe Steel of Amada Co., Ltd. application, publication number: CN102465222A, carry
Supply a kind of aluminium alloy base plate for magnetic disk and manufacture method thereof, disk aluminium alloy plate, be 3.5 containing Mg
More than quality % below 6 mass %, surplus is made up of Al and inevitable impurity, heats 10 at 500 DEG C
The variable quantity of the flatness before and after Miao is below 5 μm, and 500 DEG C heating 10 seconds before and
The variable quantity of average crystal grain diameter afterwards is below 10 μm.The method is for by constituting aforesaid composition
The pack annealing that aluminium alloy base plate for magnetic disk is carried out is carried out with following condition: with the programming rate liter of less than 2 DEG C/minute
Temperature is to more than 350 DEG C, maintained above more than 2 hours at 350 DEG C, then enters with the cooling rate of less than 2 DEG C/minute
Row cooling.
Based on the whole world to the demand of hard disk and the keen competition of hard disk market, the capacity for hard disk has had bigger
Demand, the technology of hard disk almag substrate is also being continuously updated and is developing, and the capacity of current hard disk is
Reach more than 4TB, the most widely used 1GB hard disk, its capacity has improve thousand of times, and moderns
The lifting of hard-disk capacity is also being improved further, the requirement to substrate is more and more higher, and its technical merit also exists
It is continuously updated and develops, therefore, in order to adapt to people to high stability, high storage capacity and low cost
An urgent demand, developing a kind of good base material is one of current key technical problem needing and solving.
Summary of the invention
The invention provides a kind of mechanical type hard disk rafifinal magnesium alloy plate ingot and production method thereof, produced
Plate ingot can accord with the requirement of high power capacity substrate.
A kind of mechanical type hard disk rafifinal magnesium alloy plate ingot, this plate ingot alloy component and mass percentage content
As follows:
Mg≤18.6wt%；Si≤0.005wt%；Fe≤0.005wt%；Cu:0.005-0.01wt%；Mn≤0.0015
Wt%；Cr≤0.009wt%；Zn:0.008-0.016wt%；Ti≤0.005wt%；Na≤0.001wt%；Its
Remaining impurity content summation≤0.01wt%, surplus is aluminum.
Described a kind of mechanical type hard disk rafifinal magnesium alloy plate ingot, wherein solid inclusions size maximum is not higher than
10μm；Al-Fe series intermetallic compound greatest length is less than 6 μm；Mg-Si series intermetallic compound maximum chi
Very little it is less than 3 μm；Air content is not higher than 0.1mL/100gAl；Plate ingot crystallite dimension is less than 200 microns；Rotten
Pitting number is not higher than 3/mm2。
A kind of production method of mechanical type hard disk rafifinal magnesium alloy plate ingot, the method comprises the following steps:
A. smelting high-purity aluminium magnesium alloy
Use high purity graphite crucible as molten bath, first high purity graphite crucible is carried out pretreatment, clear up surface
And coat protection material, dry 2-3 hour in the interval that temperature is 90-150 DEG C；The raw material that melting uses is:
High-purity Al ingot, rafifinal magnesium alloy, Zn ingot, Cu ingot and Al/Cr alloy, use mass fraction to be more than 60%
Ethanol solution, removes defect and the impurity thing of above-mentioned alloy surface, and the composition of described every kind of raw material is as follows:
High-purity Al ingot: Al content 99.99678wt%；Mg6.4ppm；Zn1.2ppm；Na≤0.8ppm；
Fe4.8ppm；Si4.1ppm；Cu3.1ppm；Cr0.2ppm；Ti0.8ppm；
Rafifinal magnesium alloy: Al content 0.0004ppm；Mg99.9800wt%；Zn32ppm；Fe21ppm；
Si27ppm；Mn15ppm；
Zn ingot: Al content 0.5ppm；Mg0.6ppm；Zn99.80000wt%；Fe1.0ppm；Cu0.3ppm；
Cr0.6ppm；
Cu ingot: Fe10.0ppm；Cu99.99000wt%；Mn0.5ppm；
Al/Cr alloy: Al content 95.500wt%；Fe≤0.0002ppm；Si0.0001ppm；Mn4.500ppm；
B. the Refining of rafifinal magnesium alloy
Using intermediate frequency vacuum induction heating furnace to carry out heating, the power of heating furnace is 70Kw-90Kw；Open
Open vacuum system, continue while evacuation with the heating rate of 5-15 DEG C/min to 780-810 DEG C, temperature
Opening electromagnetic agitation after arrival, mixing speed is that 100-120 turns/min, is evacuated down to 0.1Pa, keeps 20-30 to divide
Zhong Hou, closes vacuum system, is passed through purity more than the high-purity argon gas of 99wt% to 10-20Pa, the row of opening simultaneously
Air valve is continually fed into argon more than 5 minutes, adds the high-purity Al described in step a in high purity graphite crucible
Ingot, rafifinal magnesium alloy, Zn ingot, Cu ingot and Al/Cr alloy, the material quantity that regulation adds so that content of magnesium
Less than 18.6wt%, electromagnetic agitation speed is adjusted to 150-300 and turns/min, opens ultrasonic vibration simultaneously, treats temperature
After degree arrives 780-810 DEG C, being incubated 2-4 hour, again measure content of magnesium and the content of impurity component, regulation adds
The material quantity entered, it is ensured that Mg≤18.6wt% in molten metal；Si≤0.005wt%；Fe≤0.005wt%；Cu is situated between
Between 0.005-0.01wt%；Mn≤0.0015wt%；Cr≤0.009wt%；Zn is between 0.008-0.016wt%
Between, Ti≤0.005wt%；Na≤0.001wt%；Remaining impurity content summation is less than 0.01wt%, surplus
For aluminum, after meeting the requirements, prepare casting；
C. the casting of rafifinal magnesium alloy
Before Zhu Zao polishing red copper crystallizer 2000# and above sand paper, final crystallizer surface is smooth,
And without viscous aluminum or foreign body；Hot top is cast top hot top part heating, temperature >=810 DEG C, Rose Box heating-up temperature
≥720℃；Dish on crystallizer is cleared up with lower wall, it is ensured that during casting, secondary cooling water supply is stable and nothing is stifled
Plug phenomenon；Use screen plate mesh number >=35ppi；Casting technological parameter is: hot top casting uses diameter 120-164mm
Crystallizer, casting temperature 745-750 DEG C, casting speed 140mm/min, intensity of cooling and hydraulic pressure >=0.22Mpa,
Make rafifinal magnesium alloy plate ingot；
D. the post processing of rafifinal magnesium alloy plate ingot
The rafifinal magnesium alloy plate ingot obtaining above-mentioned technique carries out sawing, will expect sawing end to end, and saw cutting head material is long
Degree is not less than 100mm, and sawing tailing length is not less than 250mm；Plate ingot after sawing is carried out traditional handicraft
Wash one's face, finally to obtain plate ingot detect, use GDMS measure its composition；Surface sweeping Electronic Speculum is used to survey
Its solid inclusions size fixed, measurement result: solid inclusions size maximum is not higher than 2 μm；Al-Fe system gold
Between genus, compound greatest length is less than 6 μm；Mg-Si series intermetallic compound full-size is less than 3 μm；
Plate ingot crystallite dimension is less than 200 microns；Immersion type C-SCAN ultrasonic inspection is used to measure its air content the highest
In 0.1mL/100gAl；Use chemical method preparation acid solution and add up and corrosion condition, finally recording plate ingot hot spot
Number not higher than 3/mm2, for qualified mechanical type hard disk rafifinal magnesium alloy plate ingot.
Compared with prior art, it has the beneficial effect that the present invention significantly:
1. the present invention uses semi-continuous casting method manufacturing machine formula hard disk rafifinal magnesium alloy plate ingot, has technique
Reliable and stable, strong operability, purification purity high, it is possible to effectively remove the removal of impurity and solid chemical compound, subtract
Ensure casting crystallite dimension while few air content, the most stable technique to the influence factor of subsequent product and
Parameter realizes adjustable, controlled, it is possible to large-scale production.
2. the present invention can adapt to and for the substrate material of mechanical type hard disk from now on, be more beneficial for heat high-end, high,
The coating coating of high power capacity, reduces the impact of flatness of substrate impurity alloy phase and compound.By high-purity
Change and reduce impurity and the intermetallic compound impact on flatness of substrate during following process, it is possible to meet
The requirement of the almag substrate of more than 15000 turns.
Strong adaptability the most of the present invention.Content of magnesium, impurity required amount can be adjusted according to the specific requirement of substrate and be correlated with
Index parameter, is allowed to meet the use requirement of Current mechanical formula hard disk.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is elaborated, but the practical range of the present invention is not limited only to following
Embodiment.
Embodiment 1
A kind of high-purity Al-4%Mg alloy sheets ingot, this plate ingot alloy component and mass percentage content are as follows:
Mg:4wt%；Si:0.005wt%；Fe:0.005wt%；Cu is between 0.005-0.01wt%；
Mn:0.0015wt%；Cr:0.009wt%；Zn is between 0.008-0.016wt%；Ti:0.005wt%；
Na:0.001wt%；Remaining impurity content summation: 0.01wt%；Surplus is aluminum.
A kind of production method of high-purity Al-4%Mg alloy sheets ingot, the step of the method is as follows:
A. melting
Selection purity is 99.99wt%, and bottom surface radius is 20cm, the cylindrical high purity graphite crucible of high 100cm,
Cleaning surface also coats protection material oxidation aluminum, dries 2 hours at temperature is 90 DEG C；The raw material that melting uses
For: high-purity Al ingot, rafifinal magnesium alloy, Zn ingot, Cu ingot and Al/Cr alloy, use mass fraction more than 60%
Ethanol solution, be removed processing by the defect of above-mentioned alloy surface and impurity thing, the high-purity aluminium ingot after process
Add in graphite crucible；Intermediate frequency vacuum induction heating furnace is used to heat, the power 70Kw of heating furnace；Open
Opening vacuum system, continue while evacuation with heating rate's system of 5 DEG C/min to 780 DEG C, temperature arrives
Opening electromagnetic agitation after reaching, mixing speed is 100 turns/min, is evacuated down to 0.1Pa, closes after keeping 20 minutes
Vacuum system, is passed through the high-purity argon gas of purity 99wt% to 10Pa simultaneously, opens drain tap and be continually fed into argon
5 minutes, adding intermediate alloy ingot needed for other according to component requirements, modifying ingredients makes content of magnesium be 4wt%,
Electromagnetic agitation speed is adjusted to 150 turns/min, opens ultrasonic vibration simultaneously, is incubated 2 after temperature arrives 780 DEG C
Hour, again measure content of magnesium and the content of impurity component, it is ensured that containing Mg:4wt%, wherein Si in composition:
0.005wt%, Fe:0.005wt%, Cu are between 0.005-0.01wt%, Mn:0.0015wt%, Cr:
0.009wt%, Zn between 0.008-0.016wt%, Ti:0.005wt%, Na:0.001wt%, remaining
Impurity content summation: 0.01wt%, surplus is aluminum, prepares casting after meeting the requirements.
B. cast
Before Zhu Zao polishing red copper crystallizer 2000# sand paper, final crystallizer surface is smooth, and without viscous
Aluminum or foreign body；Hot top is cast top hot top part (take advantage of and put aluminum liquid part) heating, temperature: 810 DEG C, mistake
Filter box heating-up temperature: 720 DEG C；Dish on crystallizer is cleared up with lower wall, it is ensured that secondary cooling water during casting
Supply is stablized and without clogging；Use screen plate mesh number: 35ppi；Casting technological parameter is: hot top casts
Using the crystallizer of diameter 120mm, casting temperature is 745 DEG C, and casting speed is 140mm/min, intensity of cooling
And hydraulic pressure is 0.22MPa, obtain high-purity Al-4%Mg alloy sheets ingot.
C. plate ingot post processing
The plate ingot obtaining above-mentioned technique carries out sawing, will expect sawing end to end, saw cutting head material length: 100mm,
Sawing tailing length: 250mm；The plate ingot obtained is carried out washing one's face of traditional handicraft.The plate ingot obtained the most at last
Detecting, use GDMS to measure its composition, measurement result is qualified；Surface sweeping Electronic Speculum (SEM) is used to measure it
Solid inclusions, measurement result: solid inclusions full-size is 2 μm, Al-Fe series intermetallic compound is
Long length is 6 μm, and Mg-Si series intermetallic compound full-size is 3 μm, and plate ingot crystallite dimension is 200 microns；
Using immersion type C-SCAN ultrasonic inspection to measure its air content is 0.1mL/100gAl；Use chemical method preparating acid
Liquid is also added up and corrosion condition, and finally recording the corrosion of plate ingot and counting is 3/mm2；Measurement result display alloy sheets
Ingot meets the requirements.
Embodiment 2
A kind of high-purity Al-16%Mg alloy sheets ingot, this plate ingot alloy component and mass percentage content are as follows:
Mg:16wt%；Si≤0.005wt%；Fe≤0.005wt%；Cu is between 0.005-0.01wt%；
Mn≤0.0015wt%；Cr≤0.009wt%；Zn is between 0.008-0.016wt%；Ti≤0.005wt%；
Na≤0.001wt%/；Remaining impurity content summation is less than 0.01wt%；Surplus is aluminum；
A kind of production method of high-purity Al-16%Mg alloy sheets ingot, the method step is as follows:
A. melting
Selecting purity is 99.99%, and bottom surface radius is 20cm, the cylindrical high purity graphite crucible of high 100cm, clearly
Reason surface also coats protection material oxidation aluminum, dries 4 hours at temperature is 90 DEG C；The raw material that melting uses is:
High-purity Al ingot, rafifinal magnesium alloy, Zn ingot, Cu ingot and Al/Cr alloy, use mass fraction to be more than 60%
Ethanol solution, is removed processing by defect and the impurity thing of above-mentioned alloy surface, and the high-purity aluminium ingot after process adds
Enter in graphite crucible；Using intermediate frequency vacuum induction heating furnace to heat, the power of heating furnace is 90Kw；Open
Open vacuum system, continue while evacuation with heating rate's system of 15 DEG C/min to 810 DEG C, temperature
Opening electromagnetic agitation after arrival, mixing speed is 120 turns/min, is evacuated down to 0.1Pa, closes after keeping 30 minutes
Close vacuum system, be passed through purity more than the high-purity argon gas of 99wt% to 20Pa simultaneously, open drain tap and persistently lead to
Entering argon more than 20 minutes, add rafifinal magnesium alloy ingot according to component requirements, modifying ingredients makes content of magnesium not
More than the required composition of 18.6wt%, electromagnetic agitation speed is adjusted to 300 turns/min, opens ultrasonic vibration simultaneously,
After temperature arrives 810 DEG C, it is incubated 4 hours, again measures content of magnesium and the content of impurity component, it is ensured that in composition
Containing Mg:16wt%, wherein Si≤0.005wt%, Fe≤0.005wt%, Cu between 0.005-0.01wt% it
Between, Mn≤0.0015wt%, Cr≤0.009wt%, Zn between 0.008-0.016wt%, Ti≤0.005wt%,
Na≤0.001wt%/, remaining impurity content summation is less than 0.01wt%, and surplus is aluminum, accurate after meeting the requirements
Standby casting；
B. cast
Before Zhu Zao polishing red copper crystallizer 2500# sand paper, final crystallizer surface is smooth, and without viscous
Aluminum or foreign body；Hot top is cast top hot top part (take advantage of and put aluminum liquid part) heating, temperature: 810 DEG C, mistake
Filter box heating-up temperature: 730 DEG C；Dish on crystallizer is cleared up with lower wall, it is ensured that secondary cooling water during casting
Supply is stablized and without clogging；Use screen plate mesh number: 35ppi；Casting technological parameter is: hot top casts
Use the crystallizer of diameter 164mm, casting temperature 750 DEG C, casting speed 140mm/min, intensity of cooling and water
Pressure is 0.22MPa, obtains high-purity Al-16%Mg alloy sheets ingot；
The post processing of the most high-purity Al-16%Mg alloy sheets ingot
The plate ingot obtaining above-mentioned technique carries out sawing, will expect sawing end to end, saw cutting head material length: 200mm,
Sawing tailing length: 300mm；The plate ingot obtained is carried out washing one's face of traditional handicraft.To the final plate ingot obtained
Detecting, use GDMS to measure its composition, measurement result is qualified；Surface sweeping Electronic Speculum (SEM) is used to measure it
Solid inclusions size, measurement result: solid inclusions full-size is 3 μm, Al-Fe system intermetallic
Thing greatest length is 5 μm, and Mg-Si series intermetallic compound full-size is 2.5 μm, and plate ingot crystallite dimension is 150
Micron；Use immersion type C-SCAN ultrasonic inspection to measure its air content and be not higher than 0.1mL/100gAl；Employingization
Method preparation acid solution is also added up and corrosion condition, finally records the corrosion of plate ingot and counts: 2/mm2；
Embodiment 3
A kind of high-purity Al-8%Mg alloy sheets ingot, this plate ingot alloy component and mass percentage content are as follows:
Mg:8wt%；Si:0.004wt%；Fe:0.004wt%；Cu is between 0.005-0.01wt%；
Mn:0.0014wt%；Cr:0.008wt%；Zn is between 0.007-0.016wt%；Ti:0.004wt%；
Na:0.001wt%；Remaining impurity content summation: 0.01wt%；Surplus is aluminum；
A kind of production method of high-purity Al-8%Mg alloy sheets ingot, the method step is as follows:
A. melting
Selecting purity is 99.99%, and bottom surface radius is 20cm, the cylindrical high purity graphite crucible of high 100cm, clearly
Reason surface also coats protection material oxidation aluminum, dries 2 hours at temperature is 90 DEG C；The raw material that melting uses is:
High-purity Al ingot, rafifinal magnesium alloy, Zn ingot, Cu ingot and Al/Cr alloy, use mass fraction to be more than 70%
Ethanol solution, is removed processing by defect and the impurity thing of above-mentioned alloy surface, and the high-purity aluminium ingot after process adds
Enter in graphite crucible；Intermediate frequency vacuum induction heating furnace is used to heat, the power 75Kw of heating furnace；Open
Vacuum system, continues while evacuation with heating rate's system of 8 DEG C/min to 785 DEG C, and temperature arrives
Rear unlatching electromagnetic agitation, mixing speed is 110 turns/min, is evacuated down to 0.1Pa, closes true after keeping 30 minutes
Do-nothing system, is passed through the high-purity argon gas of purity 99wt% to 10Pa simultaneously, opens drain tap and be continually fed into argon 10
Minute, adding intermediate alloy ingot needed for other according to component requirements, modifying ingredients makes content of magnesium be 8wt%,
Electromagnetic agitation speed is adjusted to 180 turns/min, opens ultrasonic vibration simultaneously, is incubated 2.5 after temperature arrives 785 DEG C
Hour, again measure content of magnesium and the content of impurity component, it is ensured that containing Mg:8wt%, wherein Si in composition:
0.004wt%, Fe:0.004wt%, Cu are between 0.005-0.01wt%, Mn:0.0014wt%, Cr:
0.008wt%, Zn between 0.007-0.016wt%, Ti:0.004wt%, Na:0.001wt%, remaining
Impurity content summation: 0.01wt%, surplus is aluminum, prepares casting after meeting the requirements.
B. cast
Before Zhu Zao polishing red copper crystallizer 3000# sand paper, final crystallizer surface is smooth, and without viscous
Aluminum or foreign body；Hot top is cast top hot top part (take advantage of and put aluminum liquid part) heating, temperature: 810 DEG C, mistake
Filter box heating-up temperature: 720 DEG C；Dish on crystallizer is cleared up with lower wall, it is ensured that secondary cooling water during casting
Supply is stablized and without clogging；Use screen plate mesh number: 35ppi；Casting technological parameter is: hot top casts
Use diameter 120mm crystallizer, casting temperature is 745 DEG C, casting speed 130mm/min, intensity of cooling and
Hydraulic pressure is 0.21MPa, obtains high-purity Al-8%Mg alloy sheets ingot；
C. plate ingot post processing
The plate ingot obtaining above-mentioned technique carries out sawing, will expect sawing end to end, saw cutting head material length: 150mm,
Sawing tailing length: 200mm；The plate ingot obtained is carried out washing one's face of traditional handicraft.Finally to the plate ingot obtained
Detecting, use GDMS to measure its composition, measurement result meets the requirements；Surface sweeping Electronic Speculum (SEM) is used to survey
Its solid inclusions size fixed, measurement result: solid inclusions full-size is 3 μm, between Al-Fe system metal
Compound greatest length is 5 μm, and Mg-Si series intermetallic compound full-size is 2 μm, plate ingot crystallite dimension
It it is 190 microns；Using immersion type C-SCAN ultrasonic inspection to measure its air content is 0.1mL/100gAl；Employingization
Method preparation acid solution is also added up and corrosion condition, and finally recording the corrosion of plate ingot and counting is 2/mm2, measurement result
Display, alloy sheets ingot meets the requirements.
Claims (1)
1. a mechanical type hard disk production method for rafifinal magnesium alloy plate ingot, component and the mass percentage content of described mechanical type hard disk rafifinal magnesium alloy plate ingot are as follows: Mg≤18.6wt%；Si≤0.005wt%；Fe≤0.005wt%；Cu:0.005-0.01wt%；Mn≤0.0015wt%；Cr≤0.009wt%；Zn:0.008-0.016wt%；Ti≤0.005wt%；Na≤0.001wt%；Remaining impurity content summation≤0.01wt%, surplus is aluminum；
Described a kind of mechanical type hard disk rafifinal magnesium alloy plate ingot, wherein solid inclusions size maximum is not higher than 10 μm；Al-Fe series intermetallic compound greatest length is less than 6 μm；Mg-Si series intermetallic compound full-size is less than 3 μm；Air content is not higher than 0.1mL/100gAl；Plate ingot crystallite dimension is less than 200 microns；Corrode the not higher than 3/mm that counts2；
It is characterized in that the production method of described mechanical type hard disk rafifinal magnesium alloy plate ingot comprises the following steps:
A. smelting high-purity aluminium magnesium alloy
Using high purity graphite crucible as molten bath, first high purity graphite crucible carries out pretreatment, cleaning surface also coats protection material, dries 2-3 hour in the interval that temperature is 90-150 DEG C；The raw material that melting uses is: high-purity Al ingot, high purity magnesium alloy, Zn ingot, Cu ingot and Al-Cr alloy, uses the mass fraction ethanol solution more than 60%, defect and the impurity thing of above-mentioned alloy surface is removed, and the composition of described every kind of raw material is as follows:
High-purity Al ingot: Al content 99.99678wt%；Mg6.4ppm；Zn1.2ppm；Na≤0.8ppm；Fe4.8ppm；Si4.1ppm；Cu3.1ppm；Cr0.2ppm；Ti0.8ppm；
High purity magnesium alloy: Al content 0.0004ppm；Mg99.9800wt%；Zn32ppm；Fe21ppm；Si27ppm；Mn15ppm；
Zn ingot: Al content 0.5ppm；Mg0.6ppm；Zn99.80000wt%；Fe1.0ppm；Cu0.3ppm；Cr0.6ppm；
Cu ingot: Fe10.0ppm；Cu99.99000wt%；Mn0.5ppm；
Al-Cr alloy: Al content 95.500wt%；Fe≤0.0002ppm；Si0.0001ppm；Mn4.500ppm；
B. the Refining of rafifinal magnesium alloy
Using intermediate frequency vacuum induction heating furnace to heat, the power of heating furnace is 70kW-90kW；nullOpen vacuum system，Continue while evacuation with the heating rate of 5-15 DEG C/min to 780-810 DEG C，Temperature opens electromagnetic agitation after arriving，Mixing speed is that 100-120 turns/min，It is evacuated down to 0.1Pa，After keeping 20-30 minute，Close vacuum system，It is passed through the purity high-purity argon gas more than 99wt% to 10-20Pa simultaneously，Open drain tap and be continually fed into argon more than 5 minutes，The high-purity Al ingot described in step a is added in high purity graphite crucible、High purity magnesium alloy、Zn ingot、Cu ingot and Al-Cr alloy，The material quantity that regulation adds，Content of magnesium is made to be less than 18.6wt%，Electromagnetic agitation speed is adjusted to 150-300 and turns/min，Open ultrasonic vibration simultaneously，After temperature arrives 780-810 DEG C，It is incubated 2-4 hour，Again measure content of magnesium and the content of impurity component，The material quantity that regulation adds，Ensure Mg≤18.6wt% in molten metal；Si≤0.005wt%；Fe≤0.005wt%；Cu 0.005-0.01wt%；Mn≤0.0015wt%；Cr≤0.009wt%；Zn 0.008-0.016wt%, Ti≤0.005wt%；Na≤0.001wt%；Remaining impurity content summation is less than 0.01wt%, and surplus is aluminum, prepares casting after meeting the requirements；
C. the casting of rafifinal magnesium alloy
Before Zhu Zao polishing the red copper above sand paper of crystallizer 2000#, final crystallizer surface is smooth, and without viscous aluminum or foreign body；Hot top is cast top hot top part heating, temperature >=810 DEG C, Rose Box heating-up temperature >=720 DEG C；Dish on crystallizer is cleared up with lower wall, it is ensured that during casting, secondary cooling water supply is stablized and without clogging；Use screen plate mesh number >=35ppi；Casting technological parameter is: hot top casting uses the crystallizer of diameter 120-164mm, casting temperature 745-750 DEG C, casting speed 140mm/min, intensity of cooling and hydraulic pressure >=0.22MPa, makes rafifinal magnesium alloy plate ingot；
D. the post processing of rafifinal magnesium alloy plate ingot
The rafifinal magnesium alloy plate ingot obtaining above-mentioned technique carries out sawing, will expect that sawing, saw cutting head material length are not less than 100mm end to end, and sawing tailing length is not less than 250mm；Carry out the plate ingot after sawing the milling face of traditional handicraft, finally the plate ingot obtained being detected, use GDMS to measure its composition；Scanning electron microscope is used to measure its solid inclusions size, measurement result: solid inclusions size maximum is not higher than 10 μm；Al-Fe series intermetallic compound greatest length is less than 6 μm；Mg-Si series intermetallic compound full-size is less than 3 μm；Plate ingot crystallite dimension is less than 200 microns；Use immersion type C-SCAN ultrasonic inspection to measure its air content and be not higher than 0.1mL/100gAl；Use chemical method preparation acid solution and add up and corrosion condition, finally recording plate ingot and corrode the not higher than 3/mm that counts2, for qualified mechanical type hard disk rafifinal magnesium alloy plate ingot.
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