CN107312962A - A kind of bimetallic alloy machine barrel material and its production technology - Google Patents

A kind of bimetallic alloy machine barrel material and its production technology Download PDF

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Publication number
CN107312962A
CN107312962A CN201710511872.8A CN201710511872A CN107312962A CN 107312962 A CN107312962 A CN 107312962A CN 201710511872 A CN201710511872 A CN 201710511872A CN 107312962 A CN107312962 A CN 107312962A
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machine barrel
powder
alloy
base substrate
alloy machine
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邓俊杰
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Dongguan Jieyu Machinery Co Ltd
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Dongguan Jieyu Machinery Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C29/00Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/14Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on borides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • B22F3/03Press-moulding apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/68Barrels or cylinders
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/04Making non-ferrous alloys by powder metallurgy
    • C22C1/05Mixtures of metal powder with non-metallic powder
    • C22C1/051Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10Processes characterised by the sequence of their steps

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a kind of bimetallic alloy machine barrel material, the mass fraction of its material powder is than proportioning:Molybdenum Mo:25~50%, boron:2~10%, chromium Cr:5~15%, nickel:2~10%, manganese Mn:1~5%, carbon C:0.1~1%, chromium carbide:0.8~3%, iron Fe:Surplus, its production technology is:1) ball milling starting powder, 2) mix dry powders, 3) powder compacts, 4) base substrate machining and shaping, 5) it is vacuum degreasing sintered, 6) shaping processing semi-finished product, 7) processing of base substrate hot jacket, 8) endoporus working process, the bimetallic alloy machine barrel hardness that the present invention is made using previous materials is moderate, and high-temperature behavior is excellent, and bending strength is good, density and steel matrix are close, fracture toughness is high, excellent in abrasion resistance, fine corrosion resistance, cause plastic rubber shaping more stable using foregoing production technology, substantially increase the service life of alloy machine barrel.

Description

A kind of bimetallic alloy machine barrel material and its production technology
Technical field
The present invention relates to injection extrusion, grit maker cylinder production technical field, refer in particular to a kind of with ternary boride-based metal (Mo2FeB2) the bimetallic alloy machine barrel material and its production technology of ceramic component.
Background technology
In existing plastic rubber shaping extruder barrel production field, on the premise of more and more higher is required to plastic cement combination property, In the case where special type injection extrusion is popularized all the more, injection extrusion molding is in machine barrel plasticizing process, engineering plastic, powder metallurgy The heavy wear corrosion fields such as injection, ceramic injection forming, magnet iron powder, bakelite, BMC, violent abrasion is caused to machine barrel And violent corrosion, such as magnetic iron powder 90% plus fibre 65%, PPS+65% add plastic cement under the conditions of fibre, high-environmental, high fire-retardance into Type, the service life of machine barrel often only has the production stable period of 2-6 months, and substantial amounts of plastic material and resource wave are caused to this Take, seriously constrain the normal operation of production shaping enterprise;Because the missing of super abrasive resistant material, the country is caused at this The current still blank in field.
For external, the processing step that early stage machine barrel makes is usually to use 38CrMoAl (SACM645) quenched sizing Post-processing is simultaneously made after the nitrogen treatment of 72 hours, and the surface tool nitration case of such machine barrel only has 0.3~0.7mm, wearability Difference, it is impossible to tackle high glass fibre, ore deposit fiber, carbon fiber, high fire-retardance, high abrasive wear occasion, only 1~2 month left side now Right production stable period, it just can not produce shaping.Later with the maturation and self-fluxing alloy materials application of spun casting technique The visual field of popularization people so that nitridation machine barrel gradually fades out, ferrous alloy therein, nickel-base alloy, the big alloy material of cobalt-base alloy three The spun casting of material is the most extensive.
The technology profile is:Powder is added in pre-processed hole, cylinder is heated to the temperature of self-fluxing alloy thawing Degree, then the larger centrifugal force of rotation generation at a high speed is carried out, so that an alloy-layer is obtained, by following process finished product.It is external Generally the machine barrel base for adding powder is vacuumized and sealing of hole in advance with electric furnace or intermediate-frequency heating furnace, under vacuum conditions alloy Relatively low oxidation is obtained, additionally by addition a certain amount cladded type tungsten-carbide powder, preferable bimetallic alloy is also obtained The material product of machine barrel.Domestic bimetallic because of the difference on casting powder quality, heating furnace and heating in medium frequency temperature control it is accurate Sex differernce so that alloy-layer produces dilution diffusion and produces etching effect with ground so that the alloy of casting out does not reach originally The wearability and corrosion resistance of alloy design.Tungsten carbide is added after alloy thawing, because of proportion (tungsten carbide ratio much larger compared with alloy Weight is more than 13) it can be produced in high speed rotating centrifugal casting cycle and sink to the bottom effect, therefore alloy-layer will often process to obtain very thin Carbide alloy layer can be obtained, it is wear-resisting to increase its.But become because of the thinning of alloy layer thickness and with the addition fragility of tungsten carbide Big problem to have a greatly reduced quality in use.Therefore home and abroad alloy machine barrel present situation can not solve alloy machine barrel very well simultaneously High tenacity, high-wearing feature, highly corrosion resistant, the machine barrel produced can all have all kinds of problems to occur.
Although domestic three big alloy materials obtain the alloy of corresponding hardness in casting cycle, most of is not with hard Hardness formed by mutually supporting, but formed by crisp phase.With as formed by real whole hard phases generations alloy wear-resisting Property aspect have very big difference.
The content of the invention
A kind of alloy machine cylinder material is provided it is an object of the invention to overcome weak point of the prior art, the material Hardness is moderate, and high-temperature behavior is excellent, and bending strength is good, and density and steel matrix are close, and fracture toughness is high, excellent in abrasion resistance, corrosion resistant Function admirable is lost, and further provides a kind of production technology that alloy machine barrel is made of foregoing alloy machine cylinder material, is passed through The production technology causes plastic rubber shaping more stable, substantially increases the service life of alloy machine barrel, injection is extruded bimetallic Qualitative leap is generated in terms of the wearability corrosion resistance and heat-resisting quantity of alloy machine barrel.
A kind of bimetallic alloy machine barrel material, the alloy machine cylinder material is by the mass fraction of following material powder than proportioning Form:
Molybdenum Mo:25~50%, boron:2~10%, chromium Cr:5~15%, nickel:2~10%, manganese Mn:1~5%, carbon C: 0.1~1%, chromium carbide:0.8~3%, iron Fe:Surplus;
Wherein, boron is added with the alloy form of FeB.
The powder degree of each material powder is as follows:
Molybdenum Mo:1~8 μm, boron:1~15 μm, chromium Cr:1~20 μm, nickel:2~10 μm;Manganese Mn:1~15 μm, iron Fe:2 ~10 μm, carbon C:2~10 μm, chromium carbide Cr3C2:1~10 μm.
The purity of each material powder is as follows:
Molybdenum Mo:More than 99.8%, boron:More than 99.7%, chromium Cr:More than 99.8%, nickel:More than 99.5%, manganese Mn: More than 99.5%, iron Fe:More than 99.5%, chromium carbide Cr3C2:More than 99%, carbon C:More than 99.7%.
A kind of above-mentioned bimetallic alloy machine barrel material makes the production technology of alloy machine barrel, and the production craft step is as follows:
1) ball milling starting powder:Starting powder is taken by with weight/power ratio, and thicker powder is subjected to ball milling in advance, liquid is obtained State mixture;
2) mix dry powders:The starting powders that do not add of others are added into steps 1) liquid mixture in, and match somebody with somebody After more well mixed than a certain amount of liquid medium and hard spheres medium, carry out the separation of ball liquid and be dried in vacuo, obtain block powder Body, then block powder is subjected to pulverization process, obtain mix powder;
3) powder compacts:By step 2) mix powder be fitted into pre-designed base substrate mould, through supercooling Isostatic pressing process, molding or machine pressure, are made blank body;
4) base substrate machining and shaping:By step 3) blank body pass through machine tooling shaping, be made blank material;
5) it is vacuum degreasing sintered:By step 4) blank material be put into sintering furnace and be sintered, alloy base substrate is made Semi-finished product;
6) shaping processing semi-finished product:To step 5) semi-finished product and carry out mechanical shaping and processing, alloy machine barrel base is made Body;
7) base substrate hot jacket is handled:Take basal body pipe and be heated at high temperature, then by the alloy machine barrel base substrate of the precalculated magnitude of interference It is bumped into aforementioned substrates pipe, after both cool down, obtains bimetallic alloy machine barrel base substrate;
8) endoporus working process:To step 7) bimetallic alloy machine barrel base substrate carry out inner hole precision processing, double gold are made Belong to alloy machine barrel.
Further, the step 1) ball milling when be situated between using acetone or absolute ethyl alcohol and special hard ball as ball milling Matter, its Ball-milling Time is 24~72 hours, and the liquid mixture that ball milling is obtained is the mixture of average 2~5 μm of grain size numbers.
Further, the step 2) liquid medium to be adopted as absolute ethyl alcohol or acetone and purity be more than 95%, Hard spheres are a diameter of 8~Φ of Φ 15 sintered carbide ball, and ratio of the spheroid when mixing broken is about 2~4:1~2, spheroid Ratio in mixing is about 1~2:2~4, wherein, the feed molar ratio of liquid medium is solid-liquid volume ratio 3~5, incorporation time Usually 24~72 hours, the ball mill grinding best results obtained by above ratio were 2~5 μm.
Further, in the step 3) during, need to be in base substrate die surface uniform pressurization, compressive load per unit area is not Less than 100Mpa~300Mpa.
Further, the step 4) in blank material linearity be≤1000/0.2~0.5 μm, the circularity of blank material For≤0.2~0.5 μm, the blank material after shaping reduces the generation of deformation during follow-up sintering, is that final machine adds Work reduces processing capacity, improves the processing benefit of alloy base substrate.
Further, the step 5) using protective atmosphere sintering or HIP sintering, its end vacuum be 1.0 × More than 10-4pa.
Further, the step 5) sintering process be divided into the following three stage:
First stage:0~550 DEG C of heating, heating and soaking time are or so 5~6 hours, and during which auxiliary is filled with certain The protective gas of flow carries out degreasing, and the gas is argon gas, nitrogen or hydrogen, wherein, pressure is 0.2~0.8mpa, flow For 10-40L/min;
2. second stage:Within 550 DEG C~1100 DEG C of heating, heating and soaking time 5~7 hours;
3. phase III:Within 1100 DEG C~1380 DEG C of heating, heating and soaking time are 3~5 hours, after the completion of sintering Furnace cooling, completes sintering.
The step 6) alloy machine barrel base substrate roundness of external circle within 0.005~0.01 μm, alloy machine barrel base substrate Linearity is within≤1000/0.02.
The step 7) basal body pipe heating-up temperature be 600 DEG C~1000 DEG C, its cooling treatment is empty at normal temperatures and pressures Natural cooling or fan coolling in gas.
The step 8) the circularity of bimetallic alloy machine barrel endoporus be 0.005~0.01 μm, in bimetallic alloy machine barrel The linearity in hole is≤1000/0.01, and the surface smoothness of the bimetallic alloy machine barrel endoporus is >=0.4~0.8.
The beneficial effects of the present invention are:
1. the bimetallic alloy machine barrel hardness made using previous materials is moderate, high-temperature behavior is excellent, and bending strength is good, close Degree and steel matrix are approached, and fracture toughness is high, excellent in abrasion resistance, fine corrosion resistance.
2. causing plastic rubber shaping more stable using foregoing production technology, the service life of alloy machine barrel is substantially increased, Injection is set to generate qualitative leap in terms of extruding the wearability corrosion resistance and heat-resisting quantity of bimetallic alloy machine barrel.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Fig. 2 is the structural representation of mould needed for present invention process.
Fig. 3 is the metallographic structure figure before material corrosion of the present invention.
Fig. 4 is the metallographic structure figure after material corrosion of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described:
As Figure 1-4, the present invention is on a kind of bimetallic alloy machine barrel material, and the alloy machine cylinder material presses following original The mass fraction at feed powder end is formed than proportioning:
Molybdenum Mo:25~50%, boron:2~10%, chromium Cr:5~15%, nickel:2~10%, manganese Mn:1~5%, carbon C: 0.1~1%, chromium carbide:0.8~3%, iron Fe:Surplus;
Wherein, boron is added with the alloy form of FeB, preferably FeB FeB etc..
The powder degree of each material powder is as follows:
Molybdenum Mo:1~8 μm, boron:1~15 μm, chromium Cr:1~20 μm, nickel:2~10 μm;Manganese Mn:1~15 μm, iron Fe:2 ~10 μm, carbon C:2~10 μm, chromium carbide Cr3C2:1~10 μm.
The purity of each material powder is as follows:
Molybdenum Mo:More than 99.8%, boron:More than 99.7%, chromium Cr:More than 99.8%, nickel:More than 99.5%, manganese Mn: More than 99.5%, iron Fe:More than 99.5%, chromium carbide Cr3C2:More than 99%, carbon C:More than 99.7%.
According to the configuration requirement of above-mentioned bimetallic alloy machine barrel material, such as table 1 below is made:
Table 1
Further, the present invention also discloses the production work that alloy machine barrel is made in a kind of above-mentioned bimetallic alloy machine barrel material Skill, the production craft step is as follows:
1) ball milling starting powder:Starting powder is taken by with weight/power ratio, and thicker powder is subjected to ball milling in advance, liquid is obtained State mixture;
2) mix dry powders:The starting powders that do not add of others are added into steps 1) liquid mixture in, and match somebody with somebody After more well mixed than a certain amount of liquid medium and hard spheres medium, carry out the separation of ball liquid and be dried in vacuo, obtain block powder Body, then block powder is subjected to pulverization process, obtain mix powder;
3) powder compacts:By step 2) mix powder be fitted into pre-designed base substrate mould, the mould Such as Fig. 2 (wherein, 1- rubber tubes;2nd, 3- rubber chock plug;4- powder;5- steel matrix core bar) shown in, by isostatic cool pressing technique, mould Pressure or machine pressure, are made blank body;
4) base substrate machining and shaping:By step 3) blank body pass through machine tooling shaping, be made blank material;
5) it is vacuum degreasing sintered:By step 4) blank material be put into sintering furnace and be sintered, alloy base substrate is made Semi-finished product;
6) shaping processing semi-finished product:To step 5) semi-finished product and carry out mechanical shaping and processing, alloy machine barrel base is made Body;
7) base substrate hot jacket is handled:Take basal body pipe and be heated at high temperature, then by the alloy machine barrel base substrate of the precalculated magnitude of interference It is bumped into aforementioned substrates pipe, after both cool down, obtains bimetallic alloy machine barrel base substrate;
8) endoporus working process:To step 7) bimetallic alloy machine barrel base substrate carry out inner hole precision processing, double gold are made Belong to alloy machine barrel.
Further, the step 1) ball milling when be situated between using acetone or absolute ethyl alcohol and special hard ball as ball milling Matter, its Ball-milling Time is 24~72 hours, and the liquid mixture that ball milling is obtained is the mixture of average 2~5 μm of grain size numbers, this Liquid mixture and step 2) grain size number that adds powder approaches, and is final to obtain the average grain matter that comprehensive grain size number is 1~3 μm Number original material powder provide guarantee.Tested through actual verification, the original particle size of powder controls what is obtained between 1-3 μm Texture, particularly wear-resisting phase is between 1~3 μm, as shown in Figure 3,4.
Further, step 2) liquid medium to be adopted as absolute ethyl alcohol or acetone and purity be more than 95%, hard Spheroid is a diameter of 8~Φ of Φ 15 sintered carbide ball, and ratio of the spheroid when mixing broken is about 2~4:1~2, spheroid is mixed Ratio during conjunction is about 1~2:2~4, wherein, the feed molar ratio of liquid medium is solid-liquid volume ratio 3~5, and incorporation time is usual For 24~72 hours, the ball mill grinding best results obtained by above ratio were 2~5 μm.
The powder of this grain size number easily produces the reaction mutually soaked and spread after compacting blank in sintering process, from And the higher material of ductile strength is obtained, while because of wear-resisting mutually comparatively fine (1~3 μm), therefore its anti-wear performance is equally being formulated In powder.Tiny wear-resisting phase can obtain best anti-wear performance, and match a certain amount of liquid medium and spheroid medium, press The ball mill grinding best results that above ratio is obtained are 2~5 μm, and mixed effect can most preferably obtain well mixed suspension Mixing liquid.Mixing liquid pass through vacuum equipment for separating liquid from solid, carried out under conditions of with vacuum (1~200pa) compared with It is that quick ball liquid and separation of solid and liquid (carrying out simultaneously) can be controlled within 10-30 minutes, maximum limit with air contact time The oxidation and the change of performance of the reduction material of degree, because the device is designed, designed product, therefore only illustrate its performance, do not do structure Explanation.(vacuum be 0.1pa~100pa), this equipment are placed into special customized vacuum drying chamber after the completion of separation of solid and liquid Special construction explanation is not made herein for special customized and transformation of the way product.It is continuous dry between drying temperature is set as 25 DEG C~75 DEG C The dry time is 12~36h, dries and dried powder solid (blob-like shapes) is obtained after cooling, be by crushing by blocks of solid finally Grain size number is 20~500 μm of mixed-powder, and it is to be carried to increase the mobility of dress powder for next process to choose this grain size number For facility.Disintegrating apparatus is inter-trade selection part herein, does not make structure explanation.
Further, in the step 3) during, need to be in base substrate die surface uniform pressurization, compressive load per unit area is not Less than 100Mpa~300Mpa, comparatively dense alloy machine barrel base substrate can be obtained in this pressure limit, is that following process is closed Golden machine barrel base substrate provides intensity and ensured, and shortens the time for follow-up sintering process densification, accelerate Binder Phase with it is resistance to Grind the fast offset reaction of phase.
Further, step 4) in the linearity of blank material be≤1000/0.2~0.5 μm, the circularity of blank material for≤ 0.2~0.5 μm.
Further, step 5) using protective atmosphere sintering or HIP sintering, its end vacuum is 1.0 × 10- More than 4pa.
Further, step 5) sintering process be divided into the following three stage:
First stage:0~550 DEG C of heating, heating and soaking time are or so 5~6 hours, and during which auxiliary is filled with certain The protective gas of flow carries out degreasing, and the gas is argon gas, nitrogen or hydrogen, wherein, pressure is 0.2~0.8mpa, flow For 10-40L/min, degreasing is carried out with the pressure and flow insufflation gas, in the material skimming processes, can be obtained optimal Degreasing effect and optimal material protection (not oxidized), certain degreasing gas are preferably hydrogen or argon gas, are finally Nitrogen.The reason for preferential hydrogen is the process effect that can have a reduction to partial oxidation material in skimming processes, is carried significantly The quality parameter of subsequent material is risen;
Second stage:Within 550 DEG C~1100 DEG C of heating, heating and soaking time 5~7 hours;
Phase III:Heating 1100 DEG C~1380 DEG C within, heating and soaking time be 3~5 hours, after the completion of sintering with Stove is cooled down, and completes sintering.
Further, step 6) alloy machine barrel base substrate the cylindrical grinding through car after the circularity that is obtained exist Within 0.005~0.01 μm, the linearity of alloy machine barrel base substrate is within≤1000/0.02, and linearity and roundness control are herein Within the scope of, guarantee can be provided for subsequent thermal set process.
Further, step 7) basal body pipe heating-up temperature be 600 DEG C~1000 DEG C, its cooling treatment be in normal temperature and pressure Natural cooling or fan coolling in lower air, the special steel as matrix material because have chosen, so the process will not be to steel matrix Hardness and grain size cause significant impact (steel matrix be technical protocol product with Special Steel Works co-production, name The trade mark is JY26).
Yet further, step 8) bimetallic alloy machine barrel endoporus circularity be 0.005~0.01 μm, bimetallic alloy The linearity of machine barrel endoporus is≤1000/0.01, and the surface smoothness of the bimetallic alloy machine barrel endoporus is >=0.4~0.8, should Precision fully meets the use production requirement of bimetallic alloy machine barrel.
Below in conjunction with reality, table 1 is further explained:
First, in alloy machine cylinder material composition molybdenum Mo, boron (being added in the form of FeB), chromium Cr, iron Fe elements Add, be the basic element to form ceramic hard phase, hardness property of alloy machine cylinder material is mainly by ceramic hard phase in this Generation number determine, experiment proves:When it is 2% that the content for adding molybdenum Mo, which is 25%, boron content, resulting materials Hardness is minimum, i.e., it is at least less than 40% that ceramic hard, which mutually generates content, is contained when adding molybdenum Mo content for more than 50%, boron Measure for 40% when, it is more than 80% that the ceramic hards of resulting materials, which mutually generates content, and hardness highest, material property is too crisp, without straight Performance is connect, therefore the content of molybdenum Mo, boron should be controlled within above range;Wherein, the addition of iron Fe elements, mainly with iron The structure of base Binder Phase is present in material system, and the chromium nickel stainless steel superior with other Cr, Ni elements formation combination property Iron-based Binder Phase, but it is not involved in the generation of ceramic hard phase.
Secondly, chromium Cr, nickel in composition, the addition of carbon C element make material have preferable hardness and intensity, and right Iron-based Binder Phase plays significant alloy strengthening effect, improves the hardness of Binder Phase, the intensity of the material further improved. It is demonstrated experimentally that when the content that the content that chromium Cr content is 5%, nickel is 2.5%, carbon C is 0.1%, the reinforcing risen is made With unobvious;When the content that the content that chromium Cr content is 15%, nickel is 10%, carbon C is 1%, then occur in that obvious Fragility is inclined to, therefore the control of chromium Cr, nickel, carbon C content is within above range.The addition of last chromium carbide (Cr3C2) is herein Play a part of substantially suppressing crystal grain in material sintering process growing up, by crystal grain control within certain limit addition be less than The suppression crystal grain served when 0.8% is not obvious, and obvious hardness increase tendency can be produced when addition crosses 3%.
Special instruction, is observed by experiment test:The addition of manganese Mn elements in material, hence it is evident that change material Microscopic structure, particularly ceramic hard phase crystal grain increase, it is seen then that the addition of manganese Mn elements, improve material intensity and Hardness, the effect with the increase strength of materials and hardness;It is demonstrated experimentally that when manganese Mn contents are less than 1%, material can not obtain machine The abundant improvement of tool performance;When manganese Mn contents are more than 7%, the roughening of ceramic hard phase constitution, cross-breaking strength and fracture are tough Property reduction, mechanical performance improved, and manganese Mn content is controlled in above range, can obtain what mechanical performance corresponded to actual needs Material;Moreover, adding after manganese Mn, the sintering range that material is obtained expands.Therefore, in order to improve mechanical performance, it need to add Mn is added in material, and Mn content is controlled between 1~7%.
And then, bonded wear-resistant, decay resistance experiment, to the alloy machine barrel performance obtained by above-mentioned each specific embodiment It is described further:
First, the boride sample of alloy machine barrel will be taken, anti-wear performance test is carried out, its each test result is as follows:
1. YG6 bull rings are carried out under different rotating speeds, load 100N are tested, the corresponding average friction coefficient of boride sample is such as Table 2:
Table 2
2. YG6 bull rings are carried out under different rotating speeds, load 100N, compared with carbide alloy YG 8, boride sample pair is tested The wear weight loss answered such as table 3:
Table 3
3. differentiated friction is with pair, and to test load 100N, rotating speed 800r/min is tested boride sample, and it is put down Equal coefficient of friction such as table 4:
With YG6 with secondary coefficient of friction With 45# steel with secondary coefficient of friction
Boride sample 0.40 0.55
Table 4
4. differentiated friction is with pair, and to test load 100N, rotating speed 800r/min is tested boride sample, and it grinds Weight losses (compared with carbide alloy YG 8) such as table 5:
Wear and tear loss of weight during 45# steel bull rings Wear and tear loss of weight during YG6 steel bull rings
Boride sample 1.26 1.96
Carbide alloy YG 8 0.34 1.09
Table 5
From above-mentioned test data of experiment, the wearability for producing the alloy machine cylinder material being made by the present invention is only secondary In hard alloy.
Then, the boride sample and steel as matrix material of alloy machine barrel are taken, the survey of the decay resistance of different condition is carried out Examination contrast, its each test result is as follows:
1. at ambient temperature, boride sample and steel as matrix material are corroded to 65h situation in 65% nitric acid respectively To such as table 6:
Table 6
2. at ambient temperature, by boride sample and steel as matrix material respectively in nitrate acid and hydrofluoric acid (according to " GB/ T4334.4-2000”《Stainless steel nitrate acid and hydrofluoric acid corrosion tests》Configure 10% nitric acid, 3% hydrofluoric acid etching solution) In, corrode 24h situation to such as table 7:
Table 7
3. at ambient temperature, by boride sample and steel as matrix material respectively in sulfuric acid-copper-bath (according to " GB/ T4334.5-2000”《Stainless steel sulfuric acid-copper sulphate corrosion tests》Configure sulfuric acid-copper sulphate etchant solution) in, corrosion 30h situation is to such as table 8:
Table 8
4. at ambient temperature, boride sample and steel as matrix material are corroded to 65h situation pair in 5% sulfuric acid respectively Such as table 9:
Table 9
5. boride sample and steel as matrix material are corroded into 60h situation to such as table 10 in natural sea-water respectively:
Table 10
From above-mentioned test data of experiment, by the corrosion resistance of disclosed alloy machine cylinder material equivalent to Stainless steel or better than stainless steel.
A kind of disclosed bimetallic alloy machine barrel material and its production technology, in terms of material, pass through pairing The control of each raw material proportioning in golden machine barrel material, to ensure the intensity and hardness of the material made.Add and contain in material The material powder of manganese, further to improve the intensity and hardness of material, meanwhile, also expand the sintering range of material;Should Alloy machine cylinder material hardness is chosen, and hardness is up to HRC55~69, and high-temperature behavior is excellent, and operational temperature is 300~800 DEG C, is resisted Curved intensity is up to 486.74~1128.39MPa, and density is 7.8~8.2 × 103Kg/m3, and density and steel matrix are close, are broken tough Property high, excellent in abrasion resistance (as shown in table 2~5), fine corrosion resistance (as shown in table 6~10), process aspect, by life Reducing atmosphere degreasing vacuum sintering technology technology is used in production. art so that material property is more stable, substantially increases system Into the yield rate of alloy machine barrel base substrate, it is ensured that the long-time stability in injection molding extruder cylinder production process, it is ensured that alloy machine Cylinder is under severe applying working condition, and service life substantially exceeds the service life of existing all kinds alloy machine barrel.
Described above is only, to presently preferred embodiments of the present invention, not the scope of the present invention to be defined, therefore is not being taken off On the premise of design spirit of the present invention, this area ordinary skill technical staff is to construction of the present invention, feature and principle In the equivalence changes or decoration made, the protection domain that the present patent application patent all should be fallen into.

Claims (10)

1. a kind of bimetallic alloy machine barrel material, it is characterised in that the alloy machine cylinder material presses the quality of following material powder Score ratio proportioning is formed:
Molybdenum Mo:25~50%, boron:2~10%, chromium Cr:5~15%, nickel:2~10%, manganese Mn:1~5%, carbon C:0.1~ 1%, chromium carbide:0.8~3%, iron Fe:Surplus;
Wherein, boron is added with the alloy form of FeB.
2. alloy machine cylinder material according to claim 1, it is characterised in that:The powder degree of each material powder is as follows:
Molybdenum Mo:1~8 μm, boron:1~15 μm, chromium Cr:1~20 μm, nickel:2~10 μm;Manganese Mn:1~15 μm, iron Fe:2~10 μm, carbon C:2~10 μm, chromium carbide Cr3C2:1~10 μm.
3. alloy machine cylinder material according to claim 1, it is characterised in that:The purity of each material powder is as follows:
Molybdenum Mo:More than 99.8%, boron:More than 99.7%, chromium Cr:More than 99.8%, nickel:More than 99.5%, manganese Mn: More than 99.5%, iron Fe:More than 99.5%, chromium carbide Cr3C2:More than 99%, carbon C:More than 99.7%.
4. a kind of production technology that alloy machine barrel is made with any one of claims 1 to 3 bimetallic alloy machine barrel material, its It is characterised by, the production craft step is as follows:
1) ball milling starting powder:Starting powder is taken by with weight/power ratio, and thicker powder is subjected to ball milling in advance, liquid is obtained and mixes It is fit;
2) mix dry powders:The starting powders that do not add of others are added into steps 1) liquid mixture in, and match one After quantitative liquid medium and hard spheres medium are well mixed, carry out the separation of ball liquid and be dried in vacuo, obtain block powder, then Block powder is subjected to pulverization process, mix powder is obtained;
3) powder compacts:By step 2) mix powder be fitted into pre-designed base substrate mould, through supercooling etc. it is quiet Pressure technique, molding or machine pressure, are made blank body;
4) base substrate machining and shaping:By step 3) blank body pass through machine tooling shaping, be made blank material;
5) it is vacuum degreasing sintered:By step 4) blank material be put into sintering furnace and be sintered, alloy base substrate half is made Finished product;
6) shaping processing semi-finished product:To step 5) semi-finished product and carry out mechanical shaping and processing, alloy machine barrel base substrate is made;
7) base substrate hot jacket is handled:Take basal body pipe and be heated at high temperature, then the alloy machine barrel base substrate of the precalculated magnitude of interference is bumped into In aforementioned substrates pipe, after both cool down, bimetallic alloy machine barrel base substrate is obtained;
8) endoporus working process:To step 7) bimetallic alloy machine barrel base substrate carry out inner hole precision processing, be made bimetallic close Golden machine barrel.
5. production technology according to claim 4, it is characterised in that:The step 1) ball milling when use acetone or anhydrous second Alcohol and special hard ball are as ball-milling medium, and its Ball-milling Time is 24~72 hours, the liquid mixture that ball milling is obtained For the mixture of average 2~5 μm of grain size numbers.
6. production technology according to claim 4, it is characterised in that:The step 2) liquid medium be adopted as anhydrous second Alcohol or acetone and purity are more than 95%, and hard spheres are a diameter of 8~Φ of Φ 15 sintered carbide ball, and spheroid is when mixed broken Ratio be about 2~4:1~2, ratio of the spheroid in mixing is about 1~2:2~4, wherein, the feed molar ratio of liquid medium For solid-liquid volume ratio 3~5, incorporation time is usually 24~72 hours, the ball mill grinding best results obtained by above ratio For 2~5 μm.
7. production technology according to claim 4, it is characterised in that:In the step 3) during, need to be in base substrate mould Has surface uniform pressurization, compressive load per unit area is not less than 100Mpa~300Mpa.
8. production technology according to claim 4, it is characterised in that:The step 4) in blank material linearity for≤ 1000/0.2~0.5 μm, the circularity of blank material is≤0.2~0.5 μm, the step 6) alloy machine barrel base substrate roundness of external circle Within 0.005~0.01 μm, the linearity of alloy machine barrel base substrate is within≤1000/0.02, the step 8) bimetallic The circularity of alloy machine barrel endoporus is 0.005~0.01 μm, and the linearity of bimetallic alloy machine barrel endoporus is≤1000/0.01, should The surface smoothness of bimetallic alloy machine barrel endoporus is >=0.4~0.8.
9. production technology according to claim 4, it is characterised in that the step 5) using protective atmosphere sintering or heat Isostatic sintering, its end vacuum is 1.0 × more than 10-4pa, and its sintering process is divided into the following three stage:
1. first stage:0~550 DEG C of heating, heating and soaking time are or so 5~6 hours, and during which auxiliary is filled with a constant current The protective gas of amount carries out degreasing, and the gas is argon gas, nitrogen or hydrogen, wherein, pressure is 0.2~0.8mpa, and flow is 10-40L/min;
2. second stage:Within 550 DEG C~1100 DEG C of heating, heating and soaking time 5~7 hours;
3. phase III:Within 1100 DEG C~1380 DEG C of heating, heating and soaking time are 3~5 hours, with stove after the completion of sintering Cooling, completes sintering.
10. production technology according to claim 4, it is characterised in that:The step 7) basal body pipe heating-up temperature be 600 DEG C~1000 DEG C, its cooling treatment is natural cooling or fan coolling in air at normal temperatures and pressures.
CN201710511872.8A 2017-06-29 2017-06-29 A kind of bimetallic alloy machine barrel material and its production technology Pending CN107312962A (en)

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CN110270689A (en) * 2018-03-13 2019-09-24 东莞杰宇机械有限公司 A kind of bimetal tube sleeve forming technique
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CN113172229A (en) * 2021-04-08 2021-07-27 南京智田机电有限责任公司 Preparation method of composite integral bushing for double-screw extruder
CN113172225A (en) * 2021-04-08 2021-07-27 南京智田机电有限责任公司 Double-screw integral alloy bushing and preparation method thereof

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CN113172225A (en) * 2021-04-08 2021-07-27 南京智田机电有限责任公司 Double-screw integral alloy bushing and preparation method thereof

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