CN103775333B - Three-screw pump machine barrel and ceramic treatment method of inner surface of three-screw pump machine barrel - Google Patents
Three-screw pump machine barrel and ceramic treatment method of inner surface of three-screw pump machine barrel Download PDFInfo
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- CN103775333B CN103775333B CN201410035446.8A CN201410035446A CN103775333B CN 103775333 B CN103775333 B CN 103775333B CN 201410035446 A CN201410035446 A CN 201410035446A CN 103775333 B CN103775333 B CN 103775333B
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Abstract
The invention relates to a three-screw pump machine barrel and a ceramic treatment method of an inner surface of the three-screw pump machine barrel, and belongs to the technical field of material surface modification. The three-screw pump machine barrel can be used for solving the problems that the existing three-screw pump rubber bushing has high temperature sensitivity, is easy to age and has aeolotropy. The three-screw pump machine barrel is characterized in that a ceramic membrane is plated on the inner wall of the three-screw pump machine barrel, the ceramic membrane is more than 800HV in hardness and more than 50mu m in thickness, and the ceramic membrane has the characteristics of high precision, high abrasion resistance, no sensitivity to temperature change and difficulty in chemical reaction with acid-base media. The ceramic treatment method of the inner surface of the three-screw pump machine barrel comprises the following steps: firstly electrifying the pump machine barrel filled with an alkaline working solution by use of a pulsed power supply, so as to generate a Al2O3 film on the inner wall of the pump machine barrel by virtue of the electrochemical reaction, and scanning the surface of the generated film by use of a laser so as to enable the surface of the film to be flattened. The method is suitable for ceramic treatment of the surface of the pump machine barrel.
Description
Technical field
The invention belongs to material surface modifying technology field.
Background technology
Three screw pump, as one of the most frequently used pump kind, is widely used in the numerous areas such as oil, machinery, metallurgy.Three spiral shells
Bar pump in the course of the work, is engaged each other with thread groove on driven screw by driving screw and their joining with sleeve inner surface
Close, between the import and outlet of pump, form multi-stage sealed room, and by these continuous closed chambers, liquid is defeated from the import of pump
Deliver to outlet, thus forming a continuous, steady, pressure fluid for axial movement.The middle driving screw rod of three screw pump, passes through
Prime mover driven is turned round, and rotating speed is about 1450～2900r/min.Screw rod bushing is the important composition part of three screw pump, and it holds
It is subject to Fluid pressure produced by transmission medium, screw rod to produced by friction in its mechanicals efforts and work process
Heat effect power.Further, since the species of medium that screw pump is transmitted is different, the lubricity of medium is poor or containing micro- sometimes
Amount impurity.These factors all can lead to bushing that a certain degree of deformation occurs, when bushing deformation reaches to a certain degree, itself and spiral shell
Abrasion between bar will aggravate, and even " stuck " phenomenon occurs, these all affect the work efficiency of pump and use the longevity when serious
Life.
At present, select three screw pump bushing on the market is oil-resistant rubber material (as nitrile rubber, butadiene-styrene rubber more
Deng).Although rubber is as being that a kind of elastomeric macromolecular material has not available for metal material and other macromolecular materials
Premium properties (as wearability and oil resistivity etc.), but its to the hypersensitivity of temperature and itself is easily aging and material is in mechanics
The characteristics such as the anisotropy in aspect, seriously limit the application of elastomeric material, also become simultaneously and lead to three screw pump to lose efficacy
Principal element.
Content of the invention
The present invention be in order to solve existing three screw pump rubber bushing temperature sensitive degree high, easily aging and have each to
The problem of the opposite sex, a kind of method that three screw pump machine barrel and three screw pump machine barrel inner surface ceramic treatment are now provided.
A kind of three screw pump machine barrel, the inwall of this pump machine barrel is coated with layer of ceramic film, this layer of ceramic membrane include 90% to
95% Al2O3, between 50 μm to 70 μm, hardness is in 800HV for thickness.
A kind of method of three screw pump machine barrel inner surface ceramic treatment, the method comprises the following steps：
Step one：Ceramic film preparation is carried out to the inner surface of pump machine barrel, detailed process is：
Using end cap, one end of pending pump machine barrel is sealed, and be filled with alkaline working solution to the intracavity of pump machine barrel；
Three different carbon-points of volume are all immersed in the alkaline working solution of pump machine barrel intracavity, and keeps three volume differences
The carbon-point not contact internal walls with pump machine barrel；
Apply DC pulse using direct current pulse power source between the different carbon-point of three volumes and the outer wall of pump machine barrel；
Pass through loop head pipe and loop exit pipe to the alkaline work in pump machine barrel using alkaline working solution circulating pump simultaneously
It is circulated cooling as liquid it is ensured that the temperature of alkaline working solution is not higher than 40 DEG C；
When the thicknesses of layers that the inner surface of pump machine barrel produces reaches the maximum gauge that set voltage can puncture, execution
Step 2；
Step 2：Transformation hardening process is carried out to the pump machine barrel after the preparation of above-mentioned ceramic film, detailed process is：By step
The end cap of the pump machine barrel after one ceramic film preparation disassembles, and is fixed on laser works platform；
Adjust the laser head of laser instrument, make the laser light incident that laser instrument emits on the inwall of pump machine barrel；
Make laser from one end of pump machine barrel to the other end, helically the path of formula is scanned to the inwall of pump machine barrel, when
The inwall of pump machine barrel all scans when completing, the pump machine barrel after acquisition process；
The direction that described laser circumferentially scans is that counterclockwise circumferential scanning speed is between 1mm/s to 40mm/s；
The speed that described laser scans vertically is between 0.2mm/s to 10mm/s.
Before above-mentioned steps one, first pump machine barrel is carried out, concrete grammar comprises the following steps：
Step is one by one：Pump machine barrel is immersed in clear water, using the inwall 1min to 3min of clean water pump machine barrel, then will
Pump machine barrel is dried；
Step one two：In pump machine barrel immersion acetone after step is cleaned one by one or dehydrated alcohol, stand 3min to 5min,
Then pump machine barrel is dried, obtain the pump machine barrel after cleaning.
Described in above-mentioned steps one, the solute of alkaline working solution includes：KOH and Na2SiO3, wherein the concentration of KOH be 2g/L extremely
4g/L, Na2SiO3Concentration be 10g/L to 15g/L.
The solute of above-mentioned alkalescence working solution also includes BN powder, and the concentration of BN powder is 4g/L to 6g/L.
The granular size of above-mentioned BN powder is 9 μm to 11 μm.
Direct current pulse power source is utilized to apply between the different carbon-point of three volumes and the outer wall of pump machine barrel described in step one
The a cycle process of DC pulse be：
In moment t0, direct current pulse power source 3 one width of output is Tz, amplitude is the direct impulse of Vz, in this positive arteries and veins
The finish time of punching, direct current pulse power source 3 one width of output is Tf, amplitude is the negative-going pulse of Vf；
In moment t1, direct current pulse power source 3 one width of output is Tz, amplitude is the direct impulse of Vz, in this positive arteries and veins
The finish time of punching, direct current pulse power source 3 one width of output is Tf, amplitude is the negative-going pulse of Vf；
The rest may be inferred,
In moment ti, direct current pulse power source 3 one width of output is Tz, amplitude is the direct impulse of Vz, in this positive arteries and veins
The finish time of punching, direct current pulse power source 3 one width of output is Tf, amplitude is the negative-going pulse of Vf；
Wherein, Tz is between 0.01s to 0.08s, and Tz=Tf, and, between 500V to 700V, Vf is in -150V to -30V for Vz
Between, between 20Hz to 150Hz, a cycle is 40min to 90min to pulse frequency.
A kind of three screw pump machine barrel of the present invention, the inwall of this pump machine barrel is coated with layer of ceramic film, this ceramic membrane
In more than 800HV, thicknesses of layers is more than 50 μm to hardness, and this ceramic membrane has high accuracy, high abrasion degree, insensitive to temperature change
And be difficult the characteristic of chemical reaction with acid-alkali medium, original rubber bushing can be substituted, simultaneously this ceramic membrane and pump housing hole
The adhesion property of wall is good, and the two has no and is clearly separated boundary.A kind of three screw pump machine barrel inner surface pottery of the present invention
Change the method processing, first with the pulse power, the pump machine barrel being filled with alkaline working solution is energized, makes pump machine tube inner wall in electricity
Al is generated under chemical reaction2O3Thin film, then recycles laser instrument that the film surface generating is scanned, so that film surface is put down
Whole, and hardness, in more than 800HV, improves more than 8 to 10 times, thicknesses of layers is more than 50 μm.
Using method of the present invention preparation ceramic film can also to there is micro-crack, the old pump housing of Micro-v oid enters
Row is repaired, the active time of extension device to a certain extent.Combination process high in machining efficiency, and percent defective is low.
A kind of three screw pump machine barrel of the present invention and the method for three screw pump machine barrel inner surface ceramic treatment, are suitable for
Carry out ceramic processing in pump barrel surface.
Brief description
Fig. 1 is a kind of flow chart of the method for three screw pump machine barrel inner surface ceramic treatment of the present invention；
Fig. 2 is a kind of method of the three screw pump machine barrel inner surface ceramic treatment described in specific embodiment one, step
The structural representation of one processing meanss being adopted；
Fig. 3 is a kind of method of the three screw pump machine barrel inner surface ceramic treatment described in specific embodiment one, step
In two, laser is along the path schematic diagram of pump machine barrel circumferential scanning；
Fig. 4 is a kind of method of the three screw pump machine barrel inner surface ceramic treatment described in specific embodiment one, step
In two, laser is along the path schematic diagram of pump machine barrel axial scan；
Fig. 5 is the timing chart of direct current pulse power source.
Specific embodiment
Specific embodiment one：A kind of three screw pump machine barrel described in present embodiment, the inwall of this pump machine barrel is coated with one
Layer ceramic membrane, this layer of ceramic membrane includes 90% to 95% Al2O3, between 50 μm to 70 μm, hardness is in 800HV for thickness.
Specific embodiment two：Illustrate present embodiment with reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, described in present embodiment
A kind of three screw pump machine barrel inner surface ceramic treatment method, the method comprises the following steps：
Step one：Ceramic film preparation is carried out to the inner surface of pump machine barrel 1, detailed process is：
Using end cap 7, one end of pending pump machine barrel 1 is sealed, and be filled with alkaline working solution to the intracavity of pump machine barrel 1；
Three different carbon-points 2 of volume are all immersed in the alkaline working solution of pump machine barrel 1 intracavity, and keeps three volumes not
The same carbon-point 2 not contact internal walls with pump machine barrel 1；
Apply direct current arteries and veins using direct current pulse power source 3 between the different carbon-point 2 of three volumes and the outer wall of pump machine barrel 1
Punching；
Pass through loop head pipe 5 and loop exit pipe 6 to the alkali in pump machine barrel 1 using alkaline working solution circulating pump 4 simultaneously
Sex work liquid is circulated cooling it is ensured that the temperature of alkaline working solution is not higher than 40 DEG C；
When the thicknesses of layers that the inner surface of pump machine barrel 1 produces reaches the maximum gauge that set voltage can puncture, hold
Row step 2；
Step 2：Transformation hardening process is carried out to the pump machine barrel 1 after the preparation of above-mentioned ceramic film, detailed process is：To walk
The end cap 7 of the pump machine barrel 1 after a rapid ceramic film preparation disassembles, and is fixed on laser works platform；
Adjust the laser head of laser instrument, make the laser light incident that laser instrument emits on the inwall of pump machine barrel 1；
Make laser from one end of pump machine barrel 1 to the other end, helically the path of formula is scanned to the inwall of pump machine barrel 1,
When all scanning completes the inwall of pump machine barrel 1, the pump machine barrel 1 after acquisition process；
The direction that described laser circumferentially scans is that counterclockwise circumferential scanning speed is between 1mm/s to 40mm/s；
The speed that described laser scans vertically is between 0.2mm/s to 10mm/s.
In present embodiment, the different carbon-point 2 of described three volumes is all using oxidation-resistant coated graphite electrode, electrode diameter
Selection need to be determined according to the size of pump housing barrel diameter, because electrode diameter is bigger, reaction rate is faster, and surface ceramic is got over
Coarse, course of reaction is more difficult to be controlled, therefore generally, from graphite electrode diameter more corresponding thereto
Barrel diameter is little by about 25～40%.
In present embodiment, by the valve metal characteristic of aluminum alloy materials, and under alkaline solution environment, pump machine barrel 1 is applied
Plus direct current asymmetric pulses voltage, make pump machine barrel 1 surface one layer of master of in-situ preparation under chemistry, the collective effect of electrochemical reaction
Composition is wanted to be Al2O3Thin film.When thicknesses of layers reaches certain threshold values, at some weak location in film layer, there is electricity at first
Pressure punctures, and produces plasma discharge phenomenon, and in the process, thicknesses of layers continuous uniform increases, when thicknesses of layers reaches
During the maximum gauge that set voltage can puncture, stop applied voltage.During whole plasma discharge, Al2O3Crystalline phase by
Soft crystalline phase progressively changes to high rigidity crystalline phase, and the surface of oxidation film layer assumes loose structure, and aperture size is in a few micrometers
Left and right.
Then act directly on the thin-film material surface of pump machine barrel 1 inwall generation by laser, laser is to material surface institute
Produce heat effect and power effect, so that the composition of thin-film surface is undergone phase transition, and then reach to the smooth of surface and cure process.
The surface being processed by laser transformation hardening, not only material hardness be obviously improved, and the fatigue life of part also has substantially
Improvement.
Specific embodiment three：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment two
The method of face ceramic treatment is described further, and in present embodiment, before step one, first pump machine barrel 1 is carried out clearly
Wash, concrete grammar comprises the following steps：
Step is one by one：Pump machine barrel 1 is immersed in clear water, using the inwall 1min to 3min of clean water pump machine barrel 1, then
Pump machine barrel 1 is dried；
Step one two：Pump machine barrel 1 after step is cleaned one by one immerses in acetone or dehydrated alcohol, and standing 3min is extremely
Then pump machine barrel 1 is dried by 5min, obtains the pump machine barrel 1 after cleaning.
Specific embodiment four：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment two
The method of face ceramic treatment is described further, and in present embodiment, described in step one, the solute of alkaline working solution includes：
KOH and Na2SiO3, the wherein concentration of KOH is 2g/L to 4g/L, Na2SiO3Concentration be 10g/L to 15g/L.
Specific embodiment five：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment four
The method of face ceramic treatment is described further, and in present embodiment, the solute of described alkalescence working solution also includes BN powder,
The concentration of BN powder is 4g/L to 6g/L.
The preferred 5g/L of the concentration of BN powder in present embodiment.
Specific embodiment six：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment five
The method of face ceramic treatment is described further, and in present embodiment, the granular size of described BN powder is 9 μm to 11 μm.
Preferably 10 μm of the granule of BN powder described in present embodiment.
Specific embodiment seven：Illustrate present embodiment with reference to Fig. 5, present embodiment is to specific embodiment two
A kind of method of described three screw pump machine barrel inner surface ceramic treatment is described further, in present embodiment, step one
The DC pulse that described utilization direct current pulse power source 3 applies between the different carbon-point 2 of three volumes and the outer wall of pump machine barrel 1
A cycle process is：
In moment t0, direct current pulse power source 3 one width of output is Tz, amplitude is the direct impulse of Vz, in this positive arteries and veins
The finish time of punching, direct current pulse power source 3 one width of output is Tf, amplitude is the negative-going pulse of Vf；
In moment t1, direct current pulse power source 3 one width of output is Tz, amplitude is the direct impulse of Vz, in this positive arteries and veins
The finish time of punching, direct current pulse power source 3 one width of output is Tf, amplitude is the negative-going pulse of Vf；
The rest may be inferred,
In moment ti, direct current pulse power source 3 one width of output is Tz, amplitude is the direct impulse of Vz, in this positive arteries and veins
The finish time of punching, direct current pulse power source 3 one width of output is Tf, amplitude is the negative-going pulse of Vf；
Wherein, Tz is between 0.01s to 0.08s, and Tz=Tf, and, between 500V to 700V, Vf is in -150V to -30V for Vz
Between, between 20Hz to 150Hz, a cycle is 40min to 90min to pulse frequency.
Specific embodiment eight：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment two
The method of face ceramic treatment is described further, and in present embodiment, the material of described pump machine barrel 1 is high silicon cast aluminium alloy.
Specific embodiment nine：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment two
The method of face ceramic treatment is described further, and in present embodiment, laser instrument described in step 2 is CO2Laser instrument or half
Conductor laser.
Specific embodiment ten：Present embodiment is to table in a kind of three screw pump machine barrel described in specific embodiment two
The method of face ceramic treatment is described further, and in present embodiment, the power of described laser instrument is between 10W to 500W.
Specific embodiment 11：Present embodiment is in a kind of three screw pump machine barrel described in specific embodiment two
The method that surface ceramic deposition is processed is described further, and in present embodiment, the emittance of laser instrument is between 1J to 15J.
Specific embodiment 12：Present embodiment is in a kind of three screw pump machine barrel described in specific embodiment two
The method that surface ceramic deposition is processed is described further, and in present embodiment, the spot size that laser is formed is in 1mm2To 5mm2It
Between.
Using the effect to verify the present invention for following tests：
Test one：
With clear water, the cavity of pump machine barrel is carried out, after the completion of cleaning, the cleaning solution in cavity everywhere and is done
Dry process makes the moisture remaining in cavity fully evaporate.Until after cavity is completely dried, being filled with acetone or dehydrated alcohol to it,
And cleaning chamber 3min；The alkaline working solution of configuration in cleaning glass container, wherein KOH concentration are 2g/L, Na2SiO3Concentration is
10g/L, deionized water volume is 1L, and the temperature of alkaline working solution is between 18 DEG C～22 DEG C.
Pump machine barrel connects pulse power positive pole, and carbon-point connects power cathode, and supply frequency is 150Hz, and dutycycle is 40%, positive
Magnitude of voltage 420V, negative voltage value is -60V, and preparation time is 60min.After off-test, deenergization, using deionized water
Long film rear chamber is rinsed, subsequently the pump housing is placed in being dried and is dried process.After 30min dried, obtain final product
To metal oxide film layer.
Set CO2 laser device laser head along the scanning speed in axially bored line vertical direction as 13mm/s, along axially bored line direction
On speed be 1mm/s, the Duplication of adjacent optical path is 20%, and power is 130W, and emittance is 3J, and spot size is
2mm2.
After testing, prepared Al2O30.2 μm of thicknesses of layers, the hardness of film layer is 900HV, and film surface is uniformly,
Non-microcracked or Micro-v oid exists.Show excellent anti-wear performance and fatigue behaviour.
Test two：
With clear water, the cavity of pump machine barrel is carried out, after the completion of cleaning, the cleaning solution in cavity everywhere and is done
Dry process makes the moisture remaining in cavity fully evaporate.Until after cavity is completely dried, being filled with acetone or dehydrated alcohol to it,
And cleaning chamber 3min；The alkaline working solution of configuration in cleaning glass container, wherein KOH concentration are 2g/L, Na2SiO3Concentration is
10g/L, deionized water volume is 1L, and the temperature of alkaline working solution is between 18 DEG C～22 DEG C.
Pump machine barrel connects pulse power positive pole, and carbon-point connects power cathode, and supply frequency is 150Hz, and dutycycle is 40%, positive
Magnitude of voltage 420V, negative voltage value is -60V, and preparation time is 60min.After off-test, deenergization, using deionized water
Long film rear chamber is rinsed, subsequently the pump housing is placed in being dried and is dried process.After 30min dried, obtain final product
To there is metal oxide film layer described in specific embodiment of the invention step one.
Set CO2 laser device laser head along the scanning speed in axially bored line vertical direction as 20mm/s, along axially bored line direction
On speed be 1mm/s, the Duplication of adjacent optical path is 10%, and power is 100W, and emittance is 2J, and spot size is
5mm2.
Claims (9)
1. a kind of method of three screw pump machine barrel inner surface ceramic treatment is it is characterised in that the method comprises the following steps：
Step one：Ceramic film preparation is carried out to the inner surface of pump machine barrel (1), detailed process is：
Using end cap (7), one end of pending pump machine barrel (1) is sealed, and the intracavity to pump machine barrel (1) is filled with alkaline working solution；
Three different carbon-points (2) of volume are all immersed in the alkaline working solution of pump machine barrel (1) intracavity, and keeps three volumes not
Same carbon-point (2) the not contact internal walls with pump machine barrel (1), described carbon-point adopts oxidation-resistant coated graphite electrode；
Apply direct current arteries and veins using direct current pulse power source (3) between the different carbon-point (2) of three volumes and the outer wall of pump machine barrel (1)
Punching；
Utilize alkaline working solution circulating pump (4) to pass through loop head pipe (5) and loop exit pipe (6) in pump machine barrel (1) simultaneously
Alkaline working solution be circulated cooling it is ensured that not higher than 40 DEG C of the temperature of alkaline working solution；
When the thicknesses of layers that the inner surface of pump machine barrel (1) produces reaches the maximum gauge that set voltage can puncture, execution
Step 2；
Step 2：Transformation hardening process is carried out to the pump machine barrel (1) after the preparation of above-mentioned ceramic film, detailed process is：By step
The end cap (7) of the pump machine barrel (1) after one ceramic film preparation disassembles, and is fixed on laser works platform；
Adjust the laser head of laser instrument, make the laser light incident that laser instrument emits on the inwall of pump machine barrel (1)；
Make laser from one end of pump machine barrel (1) to the other end, helically the path of formula is scanned to the inwall of pump machine barrel (1),
When all scanning completes the inwall of pump machine barrel (1), the pump machine barrel (1) after acquisition process；
The direction that described laser circumferentially scans is that counterclockwise circumferential scanning speed is between 1mm/s to 40mm/s；
The speed that described laser scans vertically is between 0.2mm/s to 10mm/s；
Act directly on the thin-film material surface of pump machine tube inner wall generation, laser heat effect produced to material surface by laser
With power effect, so that the composition of thin-film surface is undergone phase transition, and then reach to the smooth of surface and cure process.
2. a kind of three screw pump machine barrel inner surface ceramic treatment according to claim 1 method it is characterised in that
Before step one, first pump machine barrel (1) is carried out, concrete grammar comprises the following steps：
Step is one by one：Pump machine barrel (1) is immersed in clear water, using the inwall 1min to 3min of clean water pump machine barrel (1), then
Pump machine barrel (1) is dried；
Step one two：In pump machine barrel (1) immersion acetone after step is cleaned one by one or dehydrated alcohol, stand 3min to 5min,
Then pump machine barrel (1) is dried, obtain the pump machine barrel (1) after cleaning.
3. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 1 is it is characterised in that walk
Described in rapid one, the solute of alkaline working solution includes：KOH and Na2SiO3, the wherein concentration of KOH is 2g/L to 4g/L, Na2SiO3's
Concentration is 10g/L to 15g/L.
4. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 3 is it is characterised in that institute
The solute stating alkaline working solution also includes BN powder, and the concentration of BN powder is 4g/L to 6g/L.
5. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 4 is it is characterised in that institute
The granular size stating BN powder is 9 μm to 11 μm.
6. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 1 is it is characterised in that walk
Direct current pulse power source (3) applying between the different carbon-point (2) of three volumes and the outer wall of pump machine barrel (1) is utilized described in rapid one
The a cycle process of DC pulse is：
In moment t0, direct current pulse power source (3) one width of output is Tz, amplitude is the direct impulse of Vz, in this direct impulse
Finish time, direct current pulse power source (3) export width be Tf, amplitude be the negative-going pulse of Vf；
In moment t1, direct current pulse power source (3) one width of output is Tz, amplitude is the direct impulse of Vz, in this direct impulse
Finish time, direct current pulse power source (3) export width be Tf, amplitude be the negative-going pulse of Vf；
The rest may be inferred,
In moment ti, direct current pulse power source (3) one width of output is Tz, amplitude is the direct impulse of Vz, in this direct impulse
Finish time, direct current pulse power source (3) export width be Tf, amplitude be the negative-going pulse of Vf；
Wherein, Tz is between 0.01s to 0.08s, and Tz=Tf, Vz between 500V to 700V, Vf -150V to -30V it
Between, between 20Hz to 150Hz, a cycle is 40min to 90min to pulse frequency.
7. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 1 is it is characterised in that institute
The material stating pump machine barrel (1) is high silicon cast aluminium alloy.
8. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 1 is it is characterised in that walk
Laser instrument described in rapid two is CO2Laser instrument or semiconductor laser.
9. a kind of method of three screw pump machine barrel inner surface ceramic treatment according to claim 1 is it is characterised in that institute
The power stating laser instrument between 10W to 500W, the emittance of laser instrument between 1J to 15J, laser formed hot spot chi
Very little in 1mm2To 5mm2Between.
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