CN109266939A - A kind of high-densit WC-WB-Co spherical powder hard material and preparation method thereof - Google Patents
A kind of high-densit WC-WB-Co spherical powder hard material and preparation method thereof Download PDFInfo
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- CN109266939A CN109266939A CN201811483646.4A CN201811483646A CN109266939A CN 109266939 A CN109266939 A CN 109266939A CN 201811483646 A CN201811483646 A CN 201811483646A CN 109266939 A CN109266939 A CN 109266939A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
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- B22F9/00—Making metallic powder or suspensions thereof
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Abstract
A kind of high-densit WC-WB-Co spherical powder hard material of the invention and preparation method thereof, recipe ratio is by mass percentage are as follows: WC powder 50%-75%；WB powder 15%-38%；Co powder 8%-12%；PEG binder 1.0%-4.0%.The utility model has the advantages that introducing WB in material system design, ternary phase CoWB is generated since WB can react in Powder during Sintering Process with metal phase Co, and CoWB has microhardness more higher than WC and more preferably corrosion resistance, the abrasion resistance properties and corrosion resistance of material can be thus obviously improved after addition WB, the microhardness HV0.3 of coating is set to be increased to 1900 or more, the corrosion resistance of material improves 2 times or more, the production technology of high temperature nodularization can make powder heat fusing rapidly, powder particle is solidified as spherical shape in very short time under the action of surface tension after fusing, can greatly improve single powder sphericity and solid degree, the apparent density of powder final products is set to reach 7.5g/cm3 or more, rate of powder is less than 10s/50g, coating porosity is less than 0. 5%.
Description
Technical field
The present invention relates to new material technology field, specially a kind of high-densit WC-WB-Co spherical powder hard material and its
Preparation method.
Background technique
In recent years, as scientific and technical rapid advances and modern industrial technology level are continuously improved, modern machinery and equipment pair
The requirement of important spare part surface property is more and more harsher.Workpiece surface attrition and attack is always to restrict the modern machinery and equipment longevity
An important factor for life, especially under the mal-conditions such as high temperature, high pressure, heavy duty and corrosion, complete equipment is often because of workpiece surface
Erosion corrosion and fail.
Hard material is through supersonic flame spraying technology, plasma surfacing technology, laser melting and coating technique and plasma spray
The means such as painting technology are remarkably improved the performances such as the wear-resistant, corrosion-resistant of material, high temperature resistant coated on workpiece surface.
WC-Co coating material has both the high rigidity of WC and the excellent toughness of Co, has the characteristics that wear-resistant, corrosion-resistant, quilt
It is considered most widely used cermet material in hard material.But with the rapid development of engineering technology, Surface Engineering neck
More stringent requirements are proposed for wear-resistant and corrosion resistance of the domain to coating, and single WC-Co system hard material has been unable to meet
Performance requirement of the high-end applications field to material.The characteristic of friction component and its be to influence material wear-resistant with the combination interface of matrix
The principal element of damage and corrosion resistance, WB have particularly important status in modern industry, have more higher than WC micro-
Hardness and more preferably corrosion resistance are based on this, and WB is introduced into WC-Co hard alloy material system by the present invention, to change
It plays a significant role in the research of kind material microstructure, tribological property and corrosion resistance.
Spherical powder hard material has that good fluidity, apparent density are high, prepares coating porosity is few, coating abrasion-proof corrosion-proof
The advantages that losing function admirable, and the higher the above advantage of spherical powder consistency is just more obvious, thus, domestic and international researcher
Powder hard material is prepared into always high-densit spherical for target.Pass is seldom seen in current existing literature and patent retrieval
In the research report of WC-WB-Co spherical powder hard material preparation, the Xie Yifeng of Luoyang Jin Lu sintered-carbide tool Co., Ltd
Et al. application patent of invention CN105463283A disclose a kind of tungsten boride system heat spray coating layer material preparation method and its
Using the method main processes are as follows:
(1) with WC powder, WBn powder (n=0.5,1,2,2.5 or 0.5≤n≤2.5), metal M powder (M Co, Ni or Ni-Cr
Alloy) it is feed proportioning；
(2) using deionized water or alcohol as ball-milling medium, the material prepared is placed in wet-milling in ball grinder, it then will material
Slurry is granulated using Centrafugal spray drying tower；
(3) powder after spray drying is placed in graphite crucible, using vacuum drying oven within the scope of 1000 DEG C -1500 DEG C
Sintering；
(4) it is broken that powder is carried out after being sintered, final sizing.The tungsten boride system hot spray powder microstructure of method preparation is equal
To be hollow spherical, powder surface roughness is bigger, and apparent density of powder is also relatively low；In addition, preparing powder using this method
It is higher due to will lead to coating porosity to be hollow spherical, after thermal spraying, and then influence the wear-resistant and corrosion-resistant etc. of coating
Performance.Thus, preparing high-densit WC-WB-Co spherical powder just seems particularly necessary.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of high-densit WC-WB-Co spherical powder hard-surface coating materials
Material, prevents from failing because of workpiece surface erosion corrosion.
A kind of high-densit WC-WB-Co spherical powder hard material of the invention, formula rate is by mass percentage
Are as follows: WB powder 15%-38%, Co powder 8%-12%, PEG binder 1.0%-4.0%, WC powder 50%-75%.
A kind of method of high-densit WC-WB-Co spherical powder hard material of the invention comprises the following steps that:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is 50%-75%, the addition of WB powder
Ratio is 15%-38%, and the adding proportion of metal Co powder is 8%-12%, and selection PEG is binder, and additive amount is gross mass
1.0%-4.0%；
(2) wet-milling: the material prepared is placed in ball grinder, using deionized water or edible alcohol as ball-milling medium, ball
Expect that mass ratio controls Ball-milling Time 20h-72h in the range of 2:1-5:1；
(3) it is spray-dried: the WC-WB-Co slurry after wet-milling is spray-dried using pressure spray drying tower, make
Obtain spare mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is suppressed under the pressure of 40MPa-200MPa
It is spare at blocky idiosome；
(5) it is sintered: pressed bulk WC-WB-Co idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite
On plate, then it is sintered in 1300 DEG C of -1480 DEG C of temperature ranges using vacuum drying oven, soaking time 1
h-4h；
(6) Mechanical Crushing: sintered bulk WC-WB-Co alloy is crushed using double-roll crusher, to avoid it
He mixes impurity, and the hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder backs in step (6) and carries out Mechanical Crushing again；
(8) high temperature nodularization: the powder after primary sieving is led to from top to bottom with the blanking velocity of 30g/min-270g/min
The tubular type high temperature spheroidizing furnace erect is crossed, powder is heated rapidly and melts, and the particle of melting is formed under the action of surface tension
The very high drop of sphericity, and solidification becomes spherical in a very short period of time, the temperature control of high temperature spheroidizing furnace 2980 DEG C-
Within the scope of 3600 DEG C；
(9) secondary sieving: using ultrasonic wave sieving machine or three-D spin vibration sieve by the powder sieving after high temperature nodularization, 45 μm
Powder below is used for supersonic flame spraying, and the powder between 45 μm -125 μm for laser melting coating, plasma surfacing and waits
Plasma spray；
WC powder in the step (1), WB powder, three kinds of raw materials of Co powder quality percent purity be all larger than 99.8%；WC powder
Fisher particle size is 0.6 μm -20 μm, and the Fisher particle size of WB powder is 0.8 μm -8 μm, and the Fisher particle size of Co powder is 0.8 μm -2 μm；
Ball mill used in the step (2) is to roll Tiltable globe mill, and the hard that ball milling ball is WC-8Co closes
Gold goal；
The temperature being spray-dried in the step (3) is 180 DEG C -260 DEG C；
The heating method of tubular type high temperature spheroidizing furnace is heating in medium frequency or plasma heating in the step (8).
The beneficial effects of the present invention are:
(1) present invention introduces WB in material system design, since WB can be sent out in Powder during Sintering Process with metal phase Co
Raw reaction generates ternary phase CoWB, and CoWB has microhardness more higher than WC and more preferably corrosion resistance, thus adds
The microhardness HV0.3 of coating can be made to be increased to 1900 or more after WB, the corrosion resistance of material improves 2 times or more；
(2) present invention high intensity, prolonged wet-grinding technology and relative device ensure that powder raw material is sufficiently mixed and is crushed, and improve
The homogeneity of powder raw material, obdurability and surface can, be conducive to powder final products microhardnesses, abrasion resistance properties and resistance to
The promotion of corrosive nature；
(3) the ball milling ball that the present invention uses in wet-milling and Mechanical Crushing technique and the hard alloy for roller being WC-Co
Material can effectively avoid impurity element incorporation WC-WB-Co powder systems, ensure the purity of powder final products；
(4) present invention coats 92%ZrO in sintering process on graphite plate2- 8%Y2O3Coating can effectively prevent graphite
Plate C element is spread into WC-WB-Co material system, to ensure that the high rigidity of material system；
(5) production technology of high temperature nodularization can make powder heat fusing rapidly, and powder particle is in surface tension after fusing
Act on and be solidified as spherical shape in lower very short time, this method can greatly improve single powder sphericity and solid degree, powder can be made
The apparent density of last final products reaches 7.5g/cm3 or more, and rate of powder is less than 10s/50g, and coating porosity is less than 0.5%；
(6) method Objective itself is strong, and technical process is controllable, and securely and reliably, the high-densit WC-WB-Co produced is spherical
Powder hard material and preparation method thereof is suitable for supersonic flame spraying, plasma spraying, plasma surfacing, laser melting coating etc.
Coating production.
Detailed description of the invention
Attached drawing 1 is 60WC-30WB-10Co spherical powder SEM sem image in the embodiment of the present invention 1；
Attached drawing 2 is 50WC-38WB-12Co spherical powder SEM sem image in the embodiment of the present invention 2；
Attached drawing 3 is 75WC-17WB-8Co spherical powder SEM sem image in the embodiment of the present invention 3；
Attached drawing 4 is 70WC-20WB-10Co spherical powder section metallographic in the embodiment of the present invention 4；
Attached drawing 5 is 60WC-28WB-12Co spherical powder section metallographic in the embodiment of the present invention 5；
Attached drawing 6 is 67WC-25WB-8Co spherical powder SEM sem image in the embodiment of the present invention 6；
Attached drawing 7 is 75WC-15WB-10Co spherical powder SEM sem image in the embodiment of the present invention 7.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present disclosure clearer, below in conjunction with the embodiment of the present disclosure
Attached drawing, the technical solution of the embodiment of the present disclosure is clearly and completely described.Obviously, described embodiment is this public affairs
The a part of the embodiment opened, instead of all the embodiments.Based on described embodiment of the disclosure, ordinary skill
Personnel's every other embodiment obtained under the premise of being not necessarily to creative work, belongs to the range of disclosure protection.
A kind of high-densit WC-WB-Co spherical powder hard material of the invention, formula rate is by mass percentage
Are as follows: WB powder 15%-38%, Co powder 8%-12%, PEG binder 1.0%-4.0%, WC powder 50%-75%.
A kind of preparation method of high-densit WC-WB-Co spherical powder hard material of the invention comprises the following steps that:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is 50%-75%, the addition of WB powder
Ratio is 15%-38%, and the adding proportion of metal Co powder is 8%-12%, and selection PEG is binder, and additive amount is gross mass
1.0%-4.0%；
(2) wet-milling: the material prepared is placed in ball grinder, using deionized water or edible alcohol as ball-milling medium, ball
Expect that mass ratio controls Ball-milling Time 20h-72h in the range of 2:1-5:1；
(3) it is spray-dried: the WC-WB-Co slurry after wet-milling is spray-dried using pressure spray drying tower, make
Obtain spare mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is suppressed under the pressure of 40MPa-200MPa
It is spare at blocky idiosome；
(5) it is sintered: pressed bulk WC-WB-Co idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite
On plate, then it is sintered in 1300 DEG C of -1480 DEG C of temperature ranges using vacuum drying oven, soaking time 1h-4h；
(6) Mechanical Crushing: sintered bulk WC-WB-Co alloy is crushed using double-roll crusher, to avoid it
He mixes impurity, and the hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder backs in step (6) and carries out Mechanical Crushing again；
(8) high temperature nodularization: the powder after primary sieving is led to from top to bottom with the blanking velocity of 30g/min-270g/min
The tubular type high temperature spheroidizing furnace erect is crossed, powder is heated rapidly and melts, and the particle of melting is formed under the action of surface tension
The very high drop of sphericity, and solidification becomes spherical in a very short period of time, the temperature control of high temperature spheroidizing furnace 2980 DEG C-
Within the scope of 3600 DEG C；
(9) secondary sieving: using ultrasonic wave sieving machine or three-D spin vibration sieve by the powder sieving after high temperature nodularization, 45 μm
Powder below is used for supersonic flame spraying, and the powder between 45 μm -125 μm for laser melting coating, plasma surfacing and waits
Plasma spray；
WC powder in the step (1), WB powder, three kinds of raw materials of Co powder quality percent purity be all larger than 99.8%；WC powder
Fisher particle size is 0.6 μm -20 μm, and the Fisher particle size of WB powder is 0.8 μm -8 μm, and the Fisher particle size of Co powder is 0.8 μm -2 μm；
Ball mill used in the step (2) is to roll Tiltable globe mill, and the hard that ball milling ball is WC-8Co closes
Gold goal；
The temperature being spray-dried in the step (3) is 180 DEG C -260 DEG C；
The heating method of tubular type high temperature spheroidizing furnace is heating in medium frequency or plasma heating in the step (8).
Combined with specific embodiments below, spherical powder prepared by each embodiment of sem image detection data, the method for the present invention
Performance detection data elaborate to the present invention:
Embodiment 1, Fig. 1 are 60WC-30WB-10Co spherical powder SEM sem image, and the adding proportion with WC powder is
The adding proportion of 60%, WB powder is 30%, for the adding proportion of metal Co powder is 10%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 60%, WB powder
It is 30%, the adding proportion of metal Co powder is 10%, and selection PEG is binder, and additive amount is the 2.0% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using deionized water as ball-milling medium, ball material mass ratio is
4:1, Ball-milling Time 48h；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 120MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1360 DEG C, soaking time 2h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through to the pipe of setting with the blanking velocity of 60g/min
Formula high temperature spheroidizing furnace, powder are heated rapidly and melt, and it is very high that the particle of melting forms sphericity under the action of surface tension
Drop, and solidification becomes spherical in a very short period of time, and the temperature setting of high temperature spheroidizing furnace is at 3100 DEG C；
(9) secondary sieving: using ultrasonic wave sieving machine by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
Embodiment 2, Fig. 2 are 50WC-38WB-12Co spherical powder SEM sem image, and the adding proportion with WC powder is
The adding proportion of 50%, WB powder is 38%, for the adding proportion of metal Co powder is 12%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 50%, WB powder
It is 38%, the adding proportion of metal Co powder is 12%, and selection PEG is binder, and additive amount is the 2.2% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using deionized water as ball-milling medium, ball material mass ratio is
3.5:1, Ball-milling Time 60h；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 100MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1340 DEG C, soaking time 1h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through into setting with the blanking velocity of 270g/min
Tubular type high temperature spheroidizing furnace, powder are heated rapidly and melt, and the particle of melting forms sphericity very under the action of surface tension
High drop, and solidification becomes spherical in a very short period of time, the temperature setting of high temperature spheroidizing furnace is at 2980 DEG C；
(9) secondary sieving: using three-D spin vibration sieve by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
Embodiment 3, Fig. 3 is 75WC-17WB-8Co spherical powder SEM sem image, with the adding proportion of WC powder for 75%,
The adding proportion of WB powder is 17%, for the adding proportion of metal Co powder is 8%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 75%, WB powder
It is 17%, the adding proportion of metal Co powder is 8%, and selection PEG is binder, and additive amount is the 4.0% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using edible alcohol as ball-milling medium, ball material mass ratio is
5:1, Ball-milling Time 20h；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 200MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1480 DEG C, soaking time 4h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through to the pipe of setting with the blanking velocity of 30g/min
Formula high temperature spheroidizing furnace, powder are heated rapidly and melt, and it is very high that the particle of melting forms sphericity under the action of surface tension
Drop, and solidification becomes spherical in a very short period of time, and the temperature setting of high temperature spheroidizing furnace is at 3600 DEG C；
(9) secondary sieving: using three-D spin vibration sieve by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
Embodiment 4 is 70WC-20WB-10Co spherical powder section metallographic, with the adding proportion of WC powder for 70%, WB powder
Adding proportion be 20%, for the adding proportion of metal Co powder is 10%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 70%, WB powder
It is 20%, the adding proportion of metal Co powder is 10%, and selection PEG is binder, and additive amount is the 1.0% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using edible alcohol as ball-milling medium, ball material mass ratio is
2:1, Ball-milling Time 72h；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 80MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1400 DEG C, soaking time 3h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through into setting with the blanking velocity of 100g/min
Tubular type high temperature spheroidizing furnace, powder are heated rapidly and melt, and the particle of melting forms sphericity very under the action of surface tension
High drop, and solidification becomes spherical in a very short period of time, the temperature setting of high temperature spheroidizing furnace is at 3200 DEG C；
(9) secondary sieving: using ultrasonic wave sieving machine by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
Embodiment 5, Fig. 5 is 60WC-28WB-12Co spherical powder section metallographic, with the adding proportion of WC powder for 60%, WB
The adding proportion of powder is 28%, for the adding proportion of metal Co powder is 12%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 60%, WB powder
It is 28%, the adding proportion of metal Co powder is 12%, and selection PEG is binder, and additive amount is the 2.5% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using deionized water as ball-milling medium, ball material mass ratio is
3:1, Ball-milling Time 36h；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 40MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1300 DEG C, soaking time 2.5h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through into setting with the blanking velocity of 120g/min
Tubular type high temperature spheroidizing furnace, powder are heated rapidly and melt, and the particle of melting forms sphericity very under the action of surface tension
High drop, and solidification becomes spherical in a very short period of time, the temperature setting of high temperature spheroidizing furnace is at 3150 DEG C；
(9) secondary sieving: using ultrasonic wave sieving machine by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
Embodiment 6, Fig. 6 is 67WC-25WB-8Co spherical powder SEM sem image, with the adding proportion of WC powder for 67%,
The adding proportion of WB powder is 25%, for the adding proportion of metal Co powder is 8%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 67%, WB powder
It is 25%, the adding proportion of metal Co powder is 8%, and selection PEG is binder, and additive amount is the 3% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using deionized water as ball-milling medium, ball material mass ratio is
4:1, Ball-milling Time are for 24 hours；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 160MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1440 DEG C, soaking time 3h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through into setting with the blanking velocity of 180g/min
Tubular type high temperature spheroidizing furnace, powder are heated rapidly and melt, and the particle of melting forms sphericity very under the action of surface tension
High drop, and solidification becomes spherical in a very short period of time, the temperature setting of high temperature spheroidizing furnace is at 3400 DEG C；
(9) secondary sieving: using three-D spin vibration sieve by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
Embodiment 7, Fig. 7 are 75WC-15WB-10Co spherical powder SEM sem image, and the adding proportion with WC powder is
The adding proportion of 75%, WB powder is 15%, for the adding proportion of metal Co powder is 10%:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is the adding proportion of 75%, WB powder
It is 15%, the adding proportion of metal Co powder is 10%, and selection PEG is binder, and additive amount is the 3.5% of gross mass；
(2) wet-milling: the material prepared is placed in ball grinder, and using deionized water as ball-milling medium, ball material mass ratio is
4:1, Ball-milling Time 30h；
(3) it is spray-dried: the slurry after wet-milling being spray-dried using pressure spray drying tower, is made spare
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, is pressed into bulk under the pressure of 180MPa
Idiosome, it is spare；
(5) it is sintered: pressed blocky idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate on, so
It is sintered afterwards using vacuum drying oven at 1450 DEG C, soaking time 3.5h；
(6) Mechanical Crushing: sintered bulk alloy is crushed using double-roll crusher, to avoid impurity from mixing,
The hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm below
Next process steps are entered, and 125 μm or more of powder is backed within and is crushed again in Mechanical Crushing step；
(8) powder after primary sieving high temperature nodularization: is passed through to the pipe of setting with the blanking velocity of 90g/min
Formula high temperature spheroidizing furnace, powder are heated rapidly and melt, and it is very high that the particle of melting forms sphericity under the action of surface tension
Drop, and solidification becomes spherical in a very short period of time, and the temperature setting of high temperature spheroidizing furnace is at 3480 DEG C；
(9) secondary sieving: using ultrasonic wave sieving machine by the powder sieving after high temperature nodularization, 45 μm of powder below are used for
Supersonic flame spraying, the powder between 45 μm -125 μm are used for laser melting coating, plasma surfacing and plasma spraying.
It should be understood that as can be seen that preparing powder from the spherical powder SEM sem image of description of the invention attached drawing
The sphericity at end is very high, powder surface roughness also very little；And it is golden from spherical powder section prepared by attached drawing the method for the present invention
As can be seen that powder inside imporosity, shows very high consistency in phase.
Table 1 is the performance detection data of spherical powder prepared by each embodiment of the method for the present invention.
Claims (2)
1. a kind of high-densit WC-WB-Co spherical powder hard material, which is characterized in that its formula rate is by mass percentage
Are as follows:
WB powder 15%-38%；
Co powder 8%-12%；
PEG binder 1.0%-4.0%；
WC powder 50%-75%.
2. a kind of preparation method of high-densit WC-WB-Co spherical powder hard material according to claim 1, feature
It is, comprises the following steps that:
(1) ingredient: carrying out ingredient by mass percentage, and wherein the adding proportion of WC powder is 50%-75%, the adding proportion of WB powder
For 15%-38%, the adding proportion of metal Co powder is 8%-12%, and selection PEG is binder, and additive amount is gross mass
1.0%-4.0%；
(2) wet-milling: the material prepared is placed in ball grinder, using deionized water or edible alcohol as ball-milling medium, ball material matter
Amount is than controlling Ball-milling Time 20h-72h in the range of 2:1-5:1；
(3) it is spray-dried: the WC-WB-Co slurry after wet-milling being spray-dried using pressure spray drying tower, is made standby
Mixed material；
(4) it suppresses: the powder after spray drying being placed in powder press, the briquet under the pressure of 40MPa-200MPa
Shape idiosome, it is spare；
(5) it is sintered: pressed bulk WC-WB-Co idiosome being placed in surface and is coated with 92%ZrO2- 8%Y2O3Graphite plate
On, it is then sintered in 1300 DEG C of -1480 DEG C of temperature ranges using vacuum drying oven, soaking time 1h-4h；
(6) Mechanical Crushing: sintered bulk WC-WB-Co alloy is crushed using double-roll crusher, to avoid other miscellaneous
Matter incorporation, the hard alloy material of WC-6Co is used to roller；
(7) primary sieving: the irregular powder after Mechanical Crushing is sieved using three-D spin vibration sieve, 125 μm of entrance below
To next process steps, and 125 μm or more of powder backs in step (6) and carries out Mechanical Crushing again；
(8) high temperature nodularization: the powder after primary sieving is passed through with the blanking velocity of 30g/min-270g/min perpendicular
Vertical tubular type high temperature spheroidizing furnace, powder are heated rapidly and melt, and the particle of melting forms spherical shape under the action of surface tension
Very high drop is spent, and solidification becomes spherical in a very short period of time, the temperature of high temperature spheroidizing furnace is controlled at 2980 DEG C -3600 DEG C
In range；
(9) secondary sieving: using ultrasonic wave sieving machine or three-D spin vibration sieve by the powder sieving after high temperature nodularization, 45 μm or less
Powder be used for supersonic flame spraying, the powder between 45 μm -125 μm is used for laser melting coating, plasma surfacing and plasma
Spraying；
WC powder in the step (1), WB powder, three kinds of raw materials of Co powder quality percent purity be all larger than 99.8%；The Fei Shi of WC powder
Granularity is 0.6 μm -20 μm, and the Fisher particle size of WB powder is 0.8 μm -8 μm, and the Fisher particle size of Co powder is 0.8 μm -2 μm；
Ball mill used in the step (2) is to roll Tiltable globe mill, and ball milling ball is the sintered carbide ball of WC-8Co；
The temperature being spray-dried in the step (3) is 180 DEG C -260 DEG C；
The heating method of tubular type high temperature spheroidizing furnace is heating in medium frequency or plasma heating in the step (8).
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