CN112893842A - Preparation method of steel-based MoFeB metal ceramic screw - Google Patents
Preparation method of steel-based MoFeB metal ceramic screw Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
- B22F3/162—Machining, working after consolidation
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- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/14—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on borides
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Abstract
The invention discloses a preparation method of a steel-based MoFeB metal ceramic screw, which comprises the following steps: machining the medium-carbon quenched and tempered alloy into a steel-based screw mandrel, and preparing Mo-Fe-B metal powder; placing a steel-based screw mandrel in a cylindrical die, filling Mo-Fe-B metal powder in a cavity between the steel-based screw mandrel and the cylindrical die, and performing compaction, air exhaust and sealing to obtain a complex; performing cold isostatic pressing to prepare a steel-based Mo-Fe-B metal screw blank; carrying out mechanical rough machining to obtain a screw blank; performing vacuum sintering to prepare a steel-based MoFeB metal ceramic screw; and finishing to obtain the finished screw. The steel-based MoFeB metal ceramic screw rod has ultrahigh corrosion resistance and wear resistance, has excellent comprehensive performance, and can be widely applied to mixing, extrusion molding and injection molding screws of halogen-free plastics, fiber reinforced plastics and metal powder reinforced plastics.
Description
Technical Field
The invention belongs to the field of processing, manufacturing and application of metal ceramic screw composite materials, and particularly relates to a technology for manufacturing metal ceramic composite screws and MoFeB ceramic materials, which mainly comprises the steps of manufacturing metal ceramic powder, cold isostatic pressing and vacuum sintering molding, and is applied to mixing, extrusion molding, injection molding and the like of high-corrosion and high-wear halogen-free plastics, fiber-reinforced plastics and metal powder-reinforced plastics.
Background
The screws for mixing, extruding and injecting halogen-free plastics, fiber reinforced plastics and metal powder reinforced plastics need ultrahigh corrosion resistance and ultrahigh wear resistance. The traditional nitriding screw, high-speed steel screw, powder stainless steel screw, hard alloy coating screw and the like can only partially meet or can not meet the requirements at all.
In order to obtain ultrahigh corrosion resistance and ultrahigh wear resistance, boride cermet materials are gradually paid attention by scientific workers, and the invention patent 201710134136.5 discloses a high-strength molybdenum-iron-boron ternary boride material and a preparation method thereof, wherein the high-strength molybdenum-iron-boron ternary boride material comprises, by mass, 3-6% of boron, 28-60% of molybdenum, 3-10% of nickel, 5-20% of chromium, 0.2-0.8% of carbon, 0.5-4% of vanadium, 1-4% of niobium, 0.3-8% of tungsten, 0.1-1% of cerium, 1-3% of manganese and the balance of iron, and the preparation method comprises atomization powder preparation and hot isostatic pressing sintering. The invention patent 201310657697.5 discloses a preparation process of ternary boride cermet, which comprises mixing molybdenum powder, ferroboron powder, nickel powder, chromium powder and organic solvent, ball milling to obtain slurry, spraying on the steel surface, and sintering. The invention patent 2135931.8 discloses a ternary boride cermet cladding material and its preparation process, metal powder and additives (2-5% polyvinyl butyral, plasticizer, leveling agent, etc. dissolved in 70-95% ethanol) are formed into slurry according to the ratio of 1:0.6-1.5, and the slurry is coated on the surface of steel, and vacuum sintered to prepare alloy of 48% Mo, 6% B, 5% Cr, 2% Ni, 2% Ti, 2Cu and the rest Fe.
However, the ternary boride coating is brittle and hard, has certain limitation when being coated on the surface of a steel base by sizing agent, and is neither economical nor durable when being used as an integral material. The preparation method of the steel-based MoFeB metal ceramic screw rod has excellent combination of strength and toughness, corrosion resistance and wear resistance, and meets the requirements of manufacturing high-corrosion and high-wear halogen-free plastic screw rod, fiber-reinforced plastic screw rod, and mixing, extrusion molding and injection molding screw rod mechanical part products of metal powder reinforced plastics.
Disclosure of Invention
The invention aims to provide a preparation method of a steel-based MoFeB metal ceramic screw rod, which aims to solve the problems in the prior art, and aims to provide the preparation method of the steel-based MoFeB metal ceramic screw rod, so that the problems that the performance of a ternary boride coating prepared by coating slurry on the surface of a steel base and sintering is brittle, the forming method is single, the application range is limited, and the manufacturing requirements of a high-corrosion and high-wear halogen-free plastic screw rod, a fiber-reinforced plastic screw rod, a metal powder-reinforced plastic mixing, extrusion molding and injection molding screw rod.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a steel-based MoFeB metal ceramic screw comprises the following steps:
step 1, machining a medium-carbon quenched and tempered alloy into a steel-based screw mandrel, and preparing Mo-Fe-B metal powder;
step 2, placing the steel-based screw mandrel obtained in the step 1 into a cylindrical die, filling Mo-Fe-B metal powder prepared in the step 1 into a cavity between the steel-based screw mandrel and the cylindrical die, and performing compaction, air exhaust and sealing to obtain a complex;
step 3, carrying out cold isostatic pressing pressure forming on the complex obtained in the step 2 to prepare a steel-based Mo-Fe-B metal screw blank;
step 4, carrying out mechanical rough machining on the steel-based Mo-Fe-B metal screw blank obtained in the step 3 to obtain a screw blank;
step 5, performing vacuum sintering on the screw blank obtained in the step 4 to prepare a steel-based MoFeB metal ceramic screw;
and 6, performing finish machining on the steel-based MoFeB metal ceramic screw obtained in the step 5 to obtain a finished screw.
Further, in the step 1, the raw material of the Mo-Fe-B metal powder comprises the following components in percentage by mass: 9.8-24.5% of ferroboron powder, 10.0-40.0% of ferromolybdenum powder, 0.9-6.5% of nichrome powder, 0.1-15.5% of molybdenum powder, 11.5-65.0% of molybdenum boride, 2.5-12.5% of chromium powder, 0.1-0.5% of carbon powder and the balance of iron powder, mixing the raw materials, adding an adhesive accounting for 1-5% of the mass of the raw materials, carrying out ball milling, drying and screening to obtain Mo-Fe-B metal powder; wherein the adhesive is paraffin or polyvinyl alcohol.
Further, the ball milling mode is planetary ball milling or vertical stirring ball milling, the ball milling medium adopts dry ball milling or wet ball milling, the wet ball milling medium is liquid alkane solvent, and the liquid alkane solvent is one or more of normal hexane, normal heptane and kerosene.
Further, in the step 1, the steel-based screw mandrel is mechanically processed into a roughened round bar or a uniformly distributed spline shape or a uniformly distributed groove shape.
Further, in the step 2, the material of the cylindrical mold is elastic polyurethane or rubber, and plugs which are made of the same material and provided with the mandrel positioning holes are arranged at two end parts of the cylindrical mold.
Further, in the step 3, the cold isostatic pressing is dry cold isostatic pressing or wet cold isostatic pressing, the cold isostatic pressing pressure is 160-380 MPa, the pressure maintaining time is 0.05-0.5 min/mm, and the pressure increasing rate is 10-20 MPa/min.
Further, in the step 4, the steel-based Mo-Fe-B metal screw blank is directly clamped on a chuck of a machine tool, and a common lathe tool is adopted for mechanical cutting processing, wherein the rotating speed of the bar is 40-500 r/min, and the feeding depth is 0.1-3.0 mm/time.
Further, in the step 5, the vacuum sintering conditions are as follows: the heating rate is 1-10 ℃/min, and the sintering temperature is 110 DEG C0-1350 ℃, sintering time of 1mm/min, vacuum degree of 1 multiplied by 10-2～6×10-3Pa, and the cooling mode is furnace cooling.
Further, in the step 5, annealing the vacuum-sintered MoFeB metal screw blank in vacuum or atmosphere for 5-40 min/mm at 920-1200 ℃, wherein the cooling mode is furnace cooling.
A steel-based MoFeB metal ceramic screw prepared by the method.
The steel-based MoFeB cermet screw of the present invention can be used in several applications:
(1) halogen-free plastic screws for high corrosion and high wear; the screw can be used for injection molding, extrusion molding, mixing and other processing of glass fiber reinforced halogen-free plastic for a long time, and has tensile strength of more than 1000MPa, bending strength of more than 900MPa, hardness Hv of more than 1000, hydrochloric acid corrosion rate of less than 1-6 multiplied by 10-4g/cm2.h。
(2) For metal powder reinforced plastic screws; the screw rod can be used for various MIN injection moulding for a long time.
(3) The screw rod is used for injection molding of optical plastics and medical plastics.
The invention has the beneficial effects that: the steel-based MoFeB metal ceramic screw provided by the invention is an in-situ self-generated ternary boride ceramic material, and Fe, Mo, B and other elements in various alloys are combined in situ to form a MoFeB ceramic compound which is uniformly distributed in an Fe solid solution structure in the vacuum sintering process of 1100-1350 ℃ of alloy powder. Compared with the sintering of high-melting-point ceramic materials which are added with ceramic powder to the bonding phase in advance, the ceramic-solid solution ceramic material has the advantages of good interface compatibility between the ceramic phase and the solid solution, tight combination, uniform distribution and high bending strength. The MoFeB metal ceramic not only can be used independently, but also can be used with a steel core to prepare a composite MoFeB metal ceramic screw.
The steel-based MoFeB metal ceramic screw can meet the manufacturing requirements of high-corrosion and high-wear halogen-free plastic screws, fiber-reinforced plastic screws, metal powder-reinforced plastic mixing, extrusion molding, injection molding and the like.
Detailed Description
The invention relates to a preparation method of a steel-based MoFeB metal ceramic screw, which comprises the following steps:
step 1, machining a medium-carbon quenched and tempered alloy into a steel-based screw mandrel, and preparing Mo-Fe-B metal powder;
the Mo-Fe-B metal powder comprises the following raw materials in percentage by mass: 9.8-24.5% of ferroboron powder, 10.0-40.0% of ferromolybdenum powder, 0.9-6.5% of nichrome powder, 0.1-15.5% of molybdenum powder, 11.5-65.0% of molybdenum boride, 2.5-12.5% of chromium powder, 0.1-0.5% of carbon powder and the balance of iron powder, mixing the raw materials, adding an adhesive accounting for 1-5% of the mass of the raw materials, carrying out ball milling, drying and screening to obtain Mo-Fe-B metal powder; wherein the adhesive is paraffin or polyvinyl alcohol.
The ball milling mode is planetary ball milling or vertical stirring ball milling, the ball milling medium adopts dry ball milling or wet ball milling, the wet ball milling medium is liquid alkane solvent, and the liquid alkane solvent is one or more of normal hexane, normal heptane and kerosene;
mechanically processing a steel-based screw mandrel into a roughened round bar or a uniformly distributed spline shape or a uniformly distributed groove shape, wherein R of all grooves is more than 5 mm;
step 2, placing the steel-based screw mandrel obtained in the step 1 into a cylindrical die, filling Mo-Fe-B metal powder prepared in the step 1 into a cavity between the steel-based screw mandrel and the cylindrical die, and performing compaction, air exhaust and sealing to obtain a complex; the material of the cylindrical die is elastic polyurethane or rubber, and plugs which are made of the same material and provided with core rod positioning holes are arranged at two end parts of the cylindrical die; the wall thickness of the cylindrical die is not less than 5 mm;
step 3, carrying out cold isostatic pressing pressure forming on the complex obtained in the step 2 to prepare a steel-based Mo-Fe-B metal screw blank; wherein the cold isostatic pressing is dry cold isostatic pressing or wet cold isostatic pressing, the cold isostatic pressing pressure is 160-380 Mpa, the pressure maintaining time is 0.05-0.5 min/mm, and the pressure increasing speed is 10-20 Mpa/min;
step 4, carrying out mechanical rough machining on the steel-based Mo-Fe-B metal screw blank obtained in the step 3 to obtain a screw blank; the steel-based Mo-Fe-B metal screw blank is directly clamped on a chuck of a machine tool, and is mechanically cut by adopting a common lathe tool, wherein the rotating speed of the bar is 40-500 r/min, and the feed depth is 0.1-3.0 mm/time;
step 5, performing vacuum sintering on the screw blank obtained in the step 4 to prepare a steel-based MoFeB metal ceramic screw; wherein, the vacuum sintering conditions are as follows: the temperature rise speed is 1-10 ℃/min, the sintering temperature is 1100-1350 ℃, the sintering time is 1mm/min, and the vacuum degree is 1 multiplied by 10-2～6×10-3Pa, cooling along with the furnace;
and (3) carrying out vacuum or atmosphere annealing on the vacuum sintered MoFeB metal screw blank, wherein the annealing time is 5-40 min/mm, the annealing temperature is 920-1200 ℃, and the cooling mode is furnace cooling. The structure and the performance of the MoFeB are improved after annealing.
And 6, performing finish machining on the steel-based MoFeB metal ceramic screw obtained in the step 5 to obtain a finished screw.
The MoFeB metal ceramic is prepared by in-situ self-generation of Mo in the sintering process of alloy powder2FeB2Phase, good bonding with bonding phase solid solution Fe interface, final composition of MoFeB cermet: 35.0-70.0% of Mo, 4.3-8.2% of B, 0.5-15.0% of Cr, 0.5-3.5% of Ni and the balance of Fe.
The invention will be further described with reference to some specific examples.
Example 1:
step 1 a: 40.0 percent of ferromolybdenum alloy powder, 5.5 percent of nickel-chromium alloy powder, 5.5 percent of chromium powder, 11.5 percent of molybdenum boride, 0.1 percent of Mo powder, 14.0 percent of iron powder, 0.2 percent of carbon powder and the balance of ferroboron alloy powder are added with paraffin adhesive accounting for 2.5 percent of the mass of the raw materials according to the ball-to-ball ratio of 1:1, the ball-milling agent is normal hexane, the ball-milling time is 40 hours, the rotating speed is 300 r/min, and the mixture is subjected to vacuum drying and screening to obtain MoFeB metal ceramic mixed powder;
step 1 b: filling the mixed powder obtained in the step 1a into a polyurethane cylindrical die, sealing two ends of the polyurethane cylindrical die by using polyurethane plugs, and performing cold isostatic pressing under the pressure of 170Mpa for 30 minutes to form a prototype integral MoFeB cermet rod blank;
step 1 c: and (3) performing vacuum sintering on the cold isostatic pressing MoFeB metal ceramic rod blank obtained in the step 1b, wherein the sintering temperature is 1160 ℃, the heat preservation sintering time is 30 minutes, and the vacuum degree is 2.6 multiplied by 10-3Pa, the heating depth is 1.5 ℃/min, and the blank of the MoFeB metal ceramic rod is obtained after furnace cooling.
The MoFeB metal ceramic comprises the following final components: 35.6% of Mo, 4.4% of B, 8.0% of Cr, 2.9% of Ni and the balance Fe.
Example 2:
step 2 a: according to the mass percent, 35.0 percent of ferromolybdenum alloy powder, 5.5 percent of nickel-chromium alloy powder, 7.5 percent of chromium powder, 11.5 percent of molybdenum boride, 0.1 percent of Mo powder, 1.5 percent of iron powder, 0.5 percent of carbon powder and the balance of ferroboron powder are added with paraffin adhesive accounting for 3.5 percent of the mass of the raw materials, ball milling and mixing are carried out according to the ball material proportion of 1:2, the ball milling agent is kerosene, the ball milling time is 60 hours, the rotating speed is 280 r/min, and the mixture is subjected to vacuum drying and screening to obtain MoFeB metal ceramic mixed powder;
and step 2 b: filling the mixed powder obtained in the step 2a into a rubber cylindrical die, placing a steel bar core in the middle, positioning and sealing two ends of the rubber cylindrical die by using rubber plugs, and performing cold isostatic pressing under the pressure of 280MPa for 20 minutes to form a steel core MoFeB metal ceramic bar blank;
and step 2 c: and (3) performing vacuum sintering on the cold isostatic pressing forming steel core MoFeB metal ceramic rod blank in the step 2b, wherein the sintering temperature is 1260 ℃, the heat preservation sintering time is 20 minutes, and the vacuum degree is 6.0 multiplied by 10-3Pa, the heating depth is 5 ℃/min, and the steel core MoFeB metal ceramic rod blank is obtained after furnace cooling.
The MoFeB metal ceramic comprises the following final components: 47.5% of Mo, 5.1% of B, 10.1% of Cr, 2.9% of Ni and the balance Fe.
Example 3:
step 3 a: according to the mass percent, 16.0 percent of ferromolybdenum alloy powder, 5.5 percent of nichrome powder, 12.0 percent of chromium powder, 0.1 percent of Mo powder, 58.0 percent of molybdenum boride, 1.0 percent of iron powder, 0.3 percent of carbon powder and the balance of ferroboron powder are added with 3.0 percent of polyvinyl alcohol adhesive in the mass of the raw materials, ball milling and mixing are carried out according to the ball material proportion of 1:4, the ball milling agent is ethanol, the ball milling time is 35 hours, the rotating speed is 300 r/min, and the mixture is subjected to vacuum drying and screening to obtain MoFeB metal ceramic mixed powder;
and step 3 b: filling the mixed powder obtained in the step 3a into a rubber cylindrical die, placing a steel bar core in the middle, positioning and sealing two ends of the rubber cylindrical die by using rubber plugs, and performing cold isostatic pressing under the pressure of 360MPa for 25 minutes to form a steel core MoFeB metal ceramic bar blank;
and step 3 c: and (3) performing vacuum sintering on the cold isostatic pressing forming steel core MoFeB metal ceramic rod blank in the step 3b, wherein the sintering temperature is 1310 ℃, the heat preservation sintering time is 18 minutes, and the vacuum degree is 8.0 multiplied by 10-2Pa, the heating depth is 3 ℃/min, and the steel core MoFeB metal ceramic rod blank is obtained after furnace cooling.
The MoFeB metal ceramic comprises the following final components: 62.3% of Mo, 7.5% of B, 14.6% of Cr, 2.9% of Ni and the balance of Fe.
Example 4:
step 4 a: performing ball milling and mixing on 10.0% of ferromolybdenum alloy powder, 5.5% of nickel-chromium alloy powder, 2.5% of chromium powder, 65.0% of molybdenum boride, 0.1% of Mo powder, 6.4% of iron powder, 0.1% of carbon powder and the balance of ferroboron alloy powder according to the mass percentage, adding 4.0% of polyvinyl alcohol adhesive in the mass of the raw materials according to the ball material proportion of 1:3, wherein the ball milling agent is ethanol, the ball milling time is 45 hours, the rotating speed is 260 r/min, and performing vacuum drying and screening to obtain MoFeB metal ceramic mixed powder;
and 4 b: filling the mixed powder obtained in the step 4a into a polyurethane cylindrical die, placing a steel bar core in the middle, positioning and sealing two ends of the steel bar core by using a polyurethane plug, and performing cold isostatic pressing under the pressure of 300MPa for 20 minutes to form a steel core MoFeB metal ceramic bar blank;
and 4 c: and 4b, performing vacuum sintering on the cold isostatic pressing forming steel core MoFeB metal ceramic rod blank in the step 4b, wherein the sintering temperature is 1280 ℃, the heat preservation sintering time is 30 minutes, and the vacuum degree is 6.0 multiplied by 10-2Pa, the heating depth is 6 ℃/min, and the steel core MoFeB metal ceramic rod blank is obtained after furnace cooling.
The MoFeB metal ceramic comprises the following final components: 64.7% of Mo, 8.2% of B, 5.1% of Cr, 2.9% of Ni and the balance of Fe.
Example 5:
step 5 a: 40.0 percent of ferromolybdenum alloy powder, 1.0 percent of nickel-chromium alloy powder, 2.5 percent of chromium powder, 50.0 percent of molybdenum boride, 0.1 percent of Mo powder, 2.4 percent of iron powder, 0.4 percent of carbon powder and the balance of ferroboron alloy powder are added with 5.0 percent of paraffin adhesive according to the mass ratio of the raw materials, ball milling and mixing are carried out according to the ball material proportion of 1:2.5, the ball milling agent is n-heptane, the ball milling time is 50 hours, the rotating speed is 350 r/min, and the mixture is subjected to vacuum drying and screening to obtain MoFeB metal ceramic mixed powder;
and step 5 b: filling the mixed powder obtained in the step 5a into a polyurethane cylindrical die, sealing two ends of the polyurethane cylindrical die by using polyurethane plugs, and performing cold isostatic pressing at 320MPa for 30 minutes to form an integral MoFeB cermet rod blank;
and step 5 c: and (4) performing vacuum sintering on the cold isostatic pressing forming steel core MoFeB metal ceramic rod blank in the step 5b, wherein the sintering temperature is 1200 ℃, the heat preservation sintering time is 35 minutes, and the vacuum degree is 2.0 multiplied by 10-3Pa, the heating depth is 4 ℃/min, and the steel core MoFeB metal ceramic rod blank is obtained after furnace cooling.
The MoFeB metal ceramic comprises the following final components: 70.0% of Mo, 6.2% of B, 0.4% of Cr, 0.4% of Ni and the balance Fe.
Example 6:
step 6 a: carrying out ball milling and mixing on 29.0% of ferromolybdenum alloy powder, 6.3% of nickel-chromium alloy powder, 2.5% of chromium powder, 33.0% of molybdenum boride, 0.1% of Mo powder, 25.0% of iron powder, 0.2% of carbon powder and the balance of ferroboron powder according to the mass percentage, adding a paraffin adhesive accounting for 4.0% of the mass of the raw materials according to the ball material proportion of 1:3.5, wherein the ball milling agent is kerosene, the ball milling time is 48 hours, the rotating speed is 290 r/min, and carrying out vacuum drying and screening to obtain MoFeB metal ceramic mixed powder;
step 6 b: filling the mixed powder obtained in the step 6a into a rubber cylindrical die, placing a steel bar core in the middle, positioning and sealing two ends of the rubber cylindrical die by using rubber plugs, and performing cold isostatic pressing under the pressure of 190MPa for 30 minutes to form a steel core MoFeB metal ceramic bar blank;
step 6 c: to pairAnd 6b, carrying out vacuum sintering on the cold isostatic pressing forming steel core MoFeB metal ceramic rod blank at the sintering temperature of 1260 ℃, for 30 minutes in heat preservation sintering time and under the vacuum degree of 5.0 multiplied by 10-3Pa, the heating depth is 6 ℃/min, and the steel core MoFeB metal ceramic rod blank is obtained after furnace cooling.
The MoFeB metal ceramic comprises the following final components: 48.0% Mo, 4.9% B, 3.0% Cr, 3.3% Ni and the balance Fe.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. A preparation method of a steel-based MoFeB metal ceramic screw is characterized by comprising the following steps: the method comprises the following steps:
step 1, machining a medium-carbon quenched and tempered alloy into a steel-based screw mandrel, and preparing Mo-Fe-B metal powder;
step 2, placing the steel-based screw mandrel obtained in the step 1 into a cylindrical die, filling Mo-Fe-B metal powder prepared in the step 1 into a cavity between the steel-based screw mandrel and the cylindrical die, and performing compaction, air exhaust and sealing to obtain a complex;
step 3, carrying out cold isostatic pressing pressure forming on the complex obtained in the step 2 to prepare a steel-based Mo-Fe-B metal screw blank;
step 4, carrying out mechanical rough machining on the steel-based Mo-Fe-B metal screw blank obtained in the step 3 to obtain a screw blank;
step 5, performing vacuum sintering on the screw blank obtained in the step 4 to prepare a steel-based MoFeB metal ceramic screw;
and 6, performing finish machining on the steel-based MoFeB metal ceramic screw obtained in the step 5 to obtain a finished screw.
2. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: in the step 1, the Mo-Fe-B metal powder comprises the following raw materials in percentage by mass: 9.8-24.5% of ferroboron powder, 10.0-40.0% of ferromolybdenum powder, 0.9-6.5% of nichrome powder, 0.1-15.5% of molybdenum powder, 11.5-65.0% of molybdenum boride, 2.5-12.5% of chromium powder, 0.1-0.5% of carbon powder and the balance of iron powder, mixing the raw materials, adding an adhesive accounting for 1-5% of the mass of the raw materials, carrying out ball milling, drying and screening to obtain Mo-Fe-B metal powder; wherein the adhesive is paraffin or polyvinyl alcohol.
3. The method for preparing the steel-based MoFeB cermet screw according to claim 2, characterized in that: the ball milling mode is planetary ball milling or vertical stirring ball milling, the ball milling medium adopts dry ball milling or wet ball milling, the wet ball milling medium is liquid alkane solvent, and the liquid alkane solvent is one or more of normal hexane, normal heptane and kerosene.
4. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: in the step 1, the steel-based screw mandrel is mechanically processed into a roughened round bar or a uniformly distributed spline shape or a uniformly distributed groove shape.
5. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: in the step 2, the material of the cylinder mould is elastic polyurethane or rubber, and two ends of the cylinder mould are provided with plugs which are made of the same material and provided with the core rod positioning holes.
6. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: and in the step 3, the cold isostatic pressing is dry cold isostatic pressing or wet cold isostatic pressing, the cold isostatic pressing pressure is 160-380 Mpa, the pressure maintaining time is 0.05-0.5 min/mm, and the pressure increasing rate is 10-20 Mpa/min.
7. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: in the step 4, the steel-based Mo-Fe-B metal screw blank is directly clamped on a chuck of a machine tool, and a common turning tool is adopted for mechanical cutting processing, wherein the rotating speed of the bar is 40-500 r/min, and the feed depth is 0.1-3.0 mm/time.
8. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: in the step 5, the vacuum sintering conditions are as follows: the temperature rise speed is 1-10 ℃/min, the sintering temperature is 1100-1350 ℃, the sintering time is 1mm/min, and the vacuum degree is 1 multiplied by 10-2～6×10-3Pa, and the cooling mode is furnace cooling.
9. The method for preparing the steel-based MoFeB cermet screw according to claim 1, characterized in that: in the step 5, vacuum or atmosphere annealing is carried out on the vacuum sintered MoFeB metal screw blank, the annealing time is 5-40 min/mm, the annealing temperature is 920-1200 ℃, and the cooling mode is furnace cooling.
10. A steel-based MoFeB cermet screw produced by the process of any one of claims 1 to 9.
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