CN112853236B - Fiber-reinforced hard alloy and preparation method thereof - Google Patents
Fiber-reinforced hard alloy and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
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Abstract
The invention provides a fiber reinforced hard alloy which is prepared from the following raw materials in percentage by weight: 9-12% of binder, 5-6% of modified aluminum silicate fiber, 3-4% of titanium diboride, 0.6-0.9% of grain growth inhibitor and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100%. The invention also provides a preparation method of the fiber reinforced hard alloy. The fiber reinforced hard alloy provided by the invention has good toughness, thermal shock resistance, high-temperature oxidation resistance and corrosion resistance.
Description
Technical Field
The invention relates to a hard alloy, in particular to a fiber reinforced hard alloy and a preparation method thereof.
Background
The hard alloy is an alloy material prepared from a hard compound of refractory metal and bonding metal through a powder metallurgy process, has a series of excellent performances of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, is known as an industrial tooth, and is widely applied to the fields of cutter materials, machining, aerospace, high-pressure and high-temperature tests and the like. The hardness of the hard alloy commonly applied in domestic markets can reach HRA86-93, the hard alloy basically keeps unchanged even at the temperature of 500 ℃, and the hard alloy still keeps high hardness at the temperature of 1000 ℃.
In the prior art, most of the production methods of hard alloy products adopt carbide, tungsten carbide powder and cobalt powder as ingredients, paraffin, rubber or plastic as an adhesive, and the ingredients are subjected to ball milling, drying, molding agent doping, compression molding and direct sintering molding by using a sintering furnace. Tungsten carbide (WC) has the advantages of high melting point, high hardness, good chemical stability, good thermal stability, good wear resistance, high yield strength, good plastic deformation resistance, good thermal conductivity, low thermal expansion coefficient and the like, so WC-Co (Chinese grade YG) hard alloy is the mainstream of the current hard alloy.
Chinese patent application CN201710949326.2 discloses 'a V-Cr-containing superfine WC-Co hard alloy', which is prepared by the following steps: weighing and proportioning original powder according to an experimental design scheme, pouring the weighed and proportioned powder into a ball mill for ball milling, wherein the ball milling medium is alcohol, the rotating speed of the ball mill is 150r/min, and the ball-material ratio is 12: 1, ball milling time is 24 hours, after ball milling is finished, vacuum drying is carried out on prepared granules, the drying time is 80 minutes, the drying temperature is 30 ℃, then a forming agent is added for granulation, prepared powder is added into a forming machine for compression forming, the compression pressure is 180MPa, prepared pressed blanks are placed into a tube furnace for sintering, the sintering temperature is 1250 ℃, the heat preservation time is 180 minutes, after sintering is finished, prepared alloy samples are immediately placed into water for quenching, the cooling rate reaches 70 ℃/s, and the WC-Co hard alloy sintering state tissue is reserved. The invention has the following problems: the prepared hard alloy has poor toughness, thermal shock resistance, high-temperature oxidation resistance and corrosion resistance.
Disclosure of Invention
The invention aims to provide a fiber reinforced hard alloy which has good toughness, thermal shock resistance, high-temperature oxidation resistance and corrosion resistance.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the fiber reinforced hard alloy is prepared from the following raw materials in percentage by weight: 9-12% of binder, 5-6% of modified aluminum silicate fiber, 3-4% of titanium diboride, 0.6-0.9% of grain growth inhibitor and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100%.
Further, the binder is cobalt powder.
Further, the modified aluminum silicate fiber is prepared by the following steps:
scattering aluminum silicate fibers by using a scattering machine, soaking the aluminum silicate fibers in an acetone solution, taking out the aluminum silicate fibers after 20 minutes, washing the aluminum silicate fibers for 3 minutes by using absolute ethyl alcohol, and then placing the aluminum silicate fibers in an oven to dry for 2 hours at normal temperature to obtain pretreated aluminum silicate fibers; adding the pretreated aluminum silicate fiber into a modifier solution consisting of yttrium chloride, hydrofluoric acid and water, heating to 55 ℃, stirring for 35 minutes, taking out, washing for 3 minutes by absolute ethyl alcohol and deionized water respectively, transferring into an oven for drying at 100 ℃ for 2 hours, taking out, crushing and sieving by a 20-mesh sieve to obtain the modified aluminum silicate fiber.
Further, in the preparation step of the modified aluminum silicate fiber, the mass concentration of an acetone solution is 5%, and the mass ratio of the broken aluminum silicate fiber to the acetone solution is 1: 15; in the modifier solution, the mass ratio of yttrium chloride, hydrofluoric acid and water is 1:2:100, and the mass ratio of the pretreated aluminum silicate fiber to the modifier solution is 1: 30.
Further, the grain growth inhibitor comprises tantalum carbide and niobium carbide in a mass ratio of 1: 1.
Another technical problem to be solved by the present invention is to provide a method for preparing the above fiber-reinforced cemented carbide.
In order to solve the technical problems, the technical scheme is as follows:
a preparation method of fiber reinforced hard alloy comprises the following steps:
s1, weighing raw materials according to weight percentage, mixing the raw materials to obtain alloy powder, adding the alloy powder into a ball mill, sequentially adding a forming agent, oleic acid, alcohol and a ball milling rod, and carrying out ball milling for 36-60 hours to obtain slurry;
s2, passing the slurry obtained in the step S1 through a 325-mesh screen, adding the slurry into a closed spray drying tower, and performing spray drying to obtain an alloy mixture;
s3, adding the alloy mixture obtained in the step S2 into a horizontal extruder, and extruding and forming to obtain a blank;
and S4, drying the blank obtained in the step S3, then placing the dried blank into a pressure sintering furnace, dewaxing and sintering for 60-90 minutes, then sintering for 45-60 minutes in vacuum, and finally sintering for 60-75 minutes in a pressure manner to obtain the fiber reinforced hard alloy.
In step S1, the forming agent is paraffin, and the mass ratio of the alloy powder, the paraffin, the oleic acid, the alcohol and the ball grinding rod is 100:1:8:25: 500.
Further, in the step S2, the gas introduced during spray drying is nitrogen, the air inlet temperature is 220 ℃, the air outlet temperature is 120 ℃, and the feeding speed is 1.8 kg/min.
In step S3, the pressure during extrusion molding is 25MPa, and the time is 10 to 15 minutes.
Further, in step S4 of the present invention, the temperature during dewaxing and sintering is 650 ℃, and the pressure is 10 mbar; the temperature during vacuum sintering is 1150 ℃, and the pressure is 0.1 mbar; the temperature during pressure sintering was 1300 ℃ and the pressure was 4 MPa.
Compared with the prior art, the invention has the following beneficial effects:
1) the aluminum silicate fiber is cotton-silk inorganic fiber which is prepared by using flint clay as a main raw material and processing the flint clay by a high-speed centrifugation method or a blowing method and other processes after the flint clay is melted at a high temperature, and has the characteristics of high temperature resistance, corrosion resistance and high toughness, but the aluminum silicate fiber is not good in compatibility with other raw materials of the hard alloy, so that the aluminum silicate fiber is not easy to disperse uniformly in alloy powder.
2) Titanium diboride is added into the raw materials, and the hard alloy has the characteristics of high hardness, oxidation resistance and corrosion resistance, so that the hardness, the high-temperature oxidation performance and the corrosion resistance of the hard alloy can be effectively improved.
Detailed Description
The present invention will be described in detail with reference to specific embodiments, and the exemplary embodiments and descriptions thereof herein are provided to explain the present invention but not to limit the present invention.
Example 1
The fiber reinforced hard alloy is prepared from the following raw materials in percentage by weight: 10 percent of cobalt powder, 5.5 percent of modified aluminum silicate fiber, 3.5 percent of titanium diboride, 0.8 percent of grain growth inhibitor consisting of tantalum carbide and niobium carbide with the mass ratio of 1:1, and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100 percent. The modified aluminum silicate fiber is prepared by the following steps:
breaking up the aluminum silicate fibers by using a breaker, soaking the aluminum silicate fibers in an acetone solution with the mass concentration of 5% in a mass ratio of 1:15, taking out the aluminum silicate fibers after 20 minutes, washing the aluminum silicate fibers for 3 minutes by using absolute ethyl alcohol, and then drying the aluminum silicate fibers in an oven at normal temperature for 2 hours to obtain pretreated aluminum silicate fibers; adding the pretreated aluminum silicate fibers into a modifier solution consisting of yttrium chloride, hydrofluoric acid and water in a mass ratio of 1:2:100 at a mass ratio of 1:30, heating to 55 ℃, stirring for 35 minutes, taking out, washing for 3 minutes respectively with absolute ethyl alcohol and deionized water, transferring into an oven for drying at 100 ℃ for 2 hours, taking out, crushing, and sieving with a 20-mesh sieve to obtain the modified aluminum silicate fibers.
The preparation method of the fiber reinforced hard alloy comprises the following steps:
s1, weighing the raw materials according to the weight percentage, mixing the raw materials to obtain alloy powder, adding the alloy powder into a ball mill, sequentially adding paraffin, oleic acid, alcohol and a ball milling rod, and performing ball milling for 48 hours to obtain slurry, wherein the mass ratio of the alloy powder to the paraffin to the oleic acid to the alcohol to the ball milling rod is 100:1:8:25: 500;
s2, passing the slurry obtained in the step S1 through a 325-mesh screen, adding the slurry into a closed spray drying tower, and performing spray drying to obtain an alloy mixture, wherein the introduced gas is nitrogen during spray drying, the air inlet temperature is 220 ℃, the air outlet temperature is 120 ℃, and the feeding speed is 1.8 kg/min;
s3, adding the alloy mixture obtained in the step S2 into a horizontal extruder, and carrying out extrusion forming for 12 minutes under the pressure of 25MPa to obtain a blank;
s4, drying the blank obtained in the step S3, then placing the dried blank into a pressure sintering furnace, firstly dewaxing and sintering for 75 minutes, then sintering for 50 minutes in vacuum, and finally sintering for 70 minutes in a pressure manner to obtain the fiber reinforced hard alloy; the temperature during dewaxing and sintering is 650 ℃, and the pressure is 10 mbar; the temperature during vacuum sintering is 1150 ℃, and the pressure is 0.1 mbar; the temperature during pressure sintering was 1300 ℃ and the pressure was 4 MPa.
Example 2
The fiber reinforced hard alloy is prepared from the following raw materials in percentage by weight: 12 percent of cobalt powder, 5 percent of modified aluminum silicate fiber, 3.6 percent of titanium diboride, 0.7 percent of grain growth inhibitor consisting of tantalum carbide and niobium carbide with the mass ratio of 1:1, and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100 percent. The procedure for preparing the modified aluminosilicate fibers was the same as in example 1.
The preparation method of the fiber reinforced hard alloy comprises the following steps:
s1, weighing the raw materials according to the weight percentage, mixing the raw materials to obtain alloy powder, adding the alloy powder into a ball mill, sequentially adding paraffin, oleic acid, alcohol and a ball milling rod, and carrying out ball milling for 36 hours to obtain slurry, wherein the mass ratio of the alloy powder to the paraffin to the oleic acid to the alcohol to the ball milling rod is 100:1:8:25: 500;
s2, passing the slurry obtained in the step S1 through a 325-mesh screen, adding the slurry into a closed spray drying tower, and performing spray drying to obtain an alloy mixture, wherein the introduced gas is nitrogen during spray drying, the air inlet temperature is 220 ℃, the air outlet temperature is 120 ℃, and the feeding speed is 1.8 kg/min;
s3, adding the alloy mixture obtained in the step S2 into a horizontal extruder, and carrying out extrusion forming for 15 minutes under the pressure of 25MPa to obtain a blank;
s4, drying the blank obtained in the step S3, then placing the dried blank into a pressure sintering furnace, firstly dewaxing and sintering for 60 minutes, then sintering for 45 minutes in vacuum, and finally sintering for 60 minutes in a pressurizing manner to obtain the fiber reinforced hard alloy; the temperature during dewaxing and sintering is 650 ℃, and the pressure is 10 mbar; the temperature during vacuum sintering is 1150 ℃, and the pressure is 0.1 mbar; the temperature during pressure sintering was 1300 ℃ and the pressure was 4 MPa.
Example 3
The fiber reinforced hard alloy is prepared from the following raw materials in percentage by weight: 11 percent of cobalt powder, 5.2 percent of modified aluminum silicate fiber, 3 percent of titanium diboride, 0.9 percent of grain growth inhibitor consisting of tantalum carbide and niobium carbide with the mass ratio of 1:1, and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100 percent. The procedure for preparing the modified aluminosilicate fibers was the same as in example 1.
The preparation method of the fiber reinforced hard alloy comprises the following steps:
s1, weighing the raw materials according to the weight percentage, mixing the raw materials to obtain alloy powder, adding the alloy powder into a ball mill, sequentially adding paraffin, oleic acid, alcohol and a ball milling rod, and performing ball milling for 60 hours to obtain slurry, wherein the mass ratio of the alloy powder to the paraffin, the oleic acid to the alcohol to the ball milling rod is 100:1:8:25: 500;
s2, passing the slurry obtained in the step S1 through a 325-mesh screen, adding the slurry into a closed spray drying tower, and performing spray drying to obtain an alloy mixture, wherein the introduced gas is nitrogen during spray drying, the air inlet temperature is 220 ℃, the air outlet temperature is 120 ℃, and the feeding speed is 1.8 kg/min;
s3, adding the alloy mixture obtained in the step S2 into a horizontal extruder, and carrying out extrusion forming for 10 minutes under the pressure of 25MPa to obtain a blank;
s4, drying the blank obtained in the step S3, then placing the dried blank into a pressure sintering furnace, firstly dewaxing and sintering for 90 minutes, then sintering for 60 minutes in vacuum, and finally sintering for 75 minutes in a pressurizing manner to obtain the fiber reinforced hard alloy; the temperature during dewaxing and sintering is 650 ℃, and the pressure is 10 mbar; the temperature during vacuum sintering is 1150 ℃, and the pressure is 0.1 mbar; the temperature during pressure sintering was 1300 ℃ and the pressure was 4 MPa.
Example 4
The fiber reinforced hard alloy is prepared from the following raw materials in percentage by weight: 9 percent of cobalt powder, 6 percent of modified aluminum silicate fiber, 4 percent of titanium diboride, 0.6 percent of grain growth inhibitor consisting of tantalum carbide and niobium carbide with the mass ratio of 1:1, and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100 percent. The procedure for preparing the modified aluminosilicate fibers was the same as in example 1.
The preparation method of the fiber reinforced hard alloy comprises the following steps:
s1, weighing the raw materials according to the weight percentage, mixing the raw materials to obtain alloy powder, adding the alloy powder into a ball mill, sequentially adding paraffin, oleic acid, alcohol and a ball milling rod, and performing ball milling for 54 hours to obtain slurry, wherein the mass ratio of the alloy powder to the paraffin to the oleic acid to the alcohol to the ball milling rod is 100:1:8:25: 500;
s2, passing the slurry obtained in the step S1 through a 325-mesh screen, adding the slurry into a closed spray drying tower, and performing spray drying to obtain an alloy mixture, wherein the introduced gas is nitrogen during spray drying, the air inlet temperature is 220 ℃, the air outlet temperature is 120 ℃, and the feeding speed is 1.8 kg/min;
s3, adding the alloy mixture obtained in the step S2 into a horizontal extruder, and carrying out extrusion forming for 14 minutes under the pressure of 25MPa to obtain a blank;
s4, drying the blank obtained in the step S3, then placing the dried blank into a pressure sintering furnace, firstly dewaxing and sintering for 80 minutes, then sintering for 55 minutes in vacuum, and finally sintering for 65 minutes in a pressurizing manner to obtain the fiber reinforced hard alloy; the temperature during dewaxing and sintering is 650 ℃, and the pressure is 10 mbar; the temperature during vacuum sintering is 1150 ℃, and the pressure is 0.1 mbar; the temperature during pressure sintering was 1300 ℃ and the pressure was 4 MPa.
Reference example 1:
the difference from example 1 is that: the raw materials do not comprise modified aluminum silicate fibers, so that the preparation step of the modified aluminum silicate fibers is omitted.
Reference example 2:
the difference from example 1 is that: the modified aluminum silicate fiber in the raw material is replaced by aluminum silicate fiber, and the preparation step of the modified aluminum silicate fiber is omitted.
Reference example 3:
the difference from example 1 is that: titanium diboride is not included in the feedstock.
Comparative example: embodiment one of chinese patent application No. CN 201710949326.2.
The first test example: toughness testing
The test method comprises the following steps: examples 1 to 4, reference examples 1 to 3 and comparative example were each prepared as a test piece having a size of 5.25mm × 6.5mm × 20mm, and then each test piece was tested for impact strength using a 150J impact tester.
Higher impact strength indicates better toughness, and the test results are shown in table 1:
| impact Strength (J) | |
| Example 1 | 9.76 |
| Example 2 | 9.73 |
| Example 3 | 9.70 |
| Example 4 | 9.74 |
| Reference example 1 | 8.15 |
| Reference example 2 | 9.09 |
| Reference example 3 | 9.76 |
| Comparative example | 8.02 |
TABLE 1
As can be seen from Table 1, the impact strengths of inventive examples 1-4 are significantly higher than those of comparative examples, indicating that the inventive compositions have better toughness. The raw materials of reference examples 1-3 are different from those of example 1, and compared with example 1, the impact strength of reference example 1 is greatly reduced, which shows that the modified aluminum silicate fiber used in the invention can effectively improve the toughness of the hard alloy; the impact strength of reference example 2 is reduced by a smaller amount than that of reference example 1, which shows that the modification treatment of the aluminum silicate fiber of the present invention can effectively improve the compatibility with other raw materials and the dispersibility in the alloy powder.
Test example two: thermal shock resistance test
The test method comprises the following steps: examples 1 to 4, reference examples 1 to 3 and comparative examples were prepared into samples having a size of 20mm × 20mm × 4mm, respectively, and then the average failure times at 600 ℃ of each sample were measured by reference to the water quenching method, with a holding time of 10 minutes and a water cooling time of 3 minutes. The more the average failure times, the better the thermal shock resistance, and the test results are shown in table 2:
| mean number of failures (times) | |
| Example 1 | 79 |
| Example 2 | 77 |
| Example 3 | 78 |
| Example 4 | 79 |
| Reference example 1 | 66 |
| Reference example 2 | 72 |
| Reference example 3 | 79 |
| Comparative example | 61 |
TABLE 2
As can be seen from Table 2, the average failure times of examples 1-4 of the invention are all significantly greater than those of the comparative examples, indicating that the invention has better thermal shock resistance. Compared with the example 1, the average failure times of the reference example 1 are greatly reduced, which shows that the modified aluminum silicate fiber used in the invention can effectively improve the thermal shock resistance of the hard alloy; the reduction of the average failure times of the reference example 2 is smaller than that of the reference example 1, and the modification treatment of the aluminum silicate fibers can effectively improve the compatibility of the aluminum silicate fibers with other raw materials and the dispersibility of the aluminum silicate fibers in the alloy powder.
Test example three: high temperature oxidation resistance test
The test method comprises the following steps: the samples of examples 1 to 4, reference examples 1 to 3 and comparative example were prepared into samples having a diameter of 50mm and a height of 5mm, respectively, the surfaces of the samples were subjected to flattening and polishing treatment, placed in a heat treatment furnace, heated to 600 ℃ under air conditions, and then heat-preserved for 2 hours, the mass of the samples before and after the test was weighed with a balance having a precision of one ten thousandth gram, and then the mass increment S per unit area was calculated. The smaller the S, the better the high temperature oxidation resistance, and the test results are shown in Table 3:
TABLE 3
As can be seen from Table 3, S in examples 1-4 of the present invention is significantly smaller than that in the comparative examples, indicating that the present invention has better high temperature oxidation resistance. Compared with the example 1, the S of the reference example 3 is greatly increased compared with the example 1 because part of the raw materials of the reference examples 1-3 are different from the example 1, and the titanium diboride used in the invention can effectively improve the high-temperature oxidation resistance of the hard alloy.
Test example four: test of Corrosion resistance
The test method comprises the following steps: the samples of examples 1 to 4, reference examples 1 to 3 and comparative example were prepared into samples of 20mm × 10mm × 4mm in size, respectively, the samples were subjected to ethanol cleaning, acetone degreasing, drying, weighing, immersed in a 3% by mass sodium chloride solution in a reaction kettle, hydrogen sulfide was introduced into the reaction kettle to a pressure of 5Mpa, heated to 120 ℃, taken out after 24 hours, subjected to ethanol cleaning, acetone degreasing, drying, weighing, and corrosion rate was calculated by a weight loss method. The lower the corrosion rate, the better the corrosion resistance, and the test results are shown in table 4:
| corrosion Rate (mm/a) | |
| Example 1 | 0.0086 |
| Example 2 | 0.0092 |
| Example 3 | 0.0089 |
| Example 4 | 0.0090 |
| Reference example 1 | 0.0118 |
| Reference example 2 | 0.0103 |
| Reference example 3 | 0.0125 |
| Comparative example | 0.0167 |
TABLE 4
As can be seen from Table 4, the corrosion rates of inventive examples 1-4 are significantly lower than those of comparative examples, indicating that the inventive compositions have better corrosion resistance. Compared with the example 1, the corrosion rates of the reference examples 1 and 3 are obviously increased by using part of the raw materials of the reference examples 1 to 3, which shows that the modified aluminum silicate fibers and the titanium diboride used in the invention can effectively improve the thermal shock resistance of the hard alloy; the corrosion rate of the reference example 2 is lower in amplitude than that of the reference example 1, and the modification treatment of the aluminum silicate fiber provided by the invention can effectively improve the compatibility with other raw materials and the dispersibility in the alloy powder.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A fiber reinforced cemented carbide characterized by: the material is prepared from the following raw materials in percentage by weight: 9-12% of binder, 5-6% of modified aluminum silicate fiber, 3-4% of titanium diboride, 0.6-0.9% of grain growth inhibitor and the balance of tungsten carbide, wherein the sum of the weight percentages of the raw materials is 100%, and the modified aluminum silicate fiber is prepared by the following steps:
scattering aluminum silicate fibers by using a scattering machine, soaking the aluminum silicate fibers in an acetone solution, taking out the aluminum silicate fibers after 20 minutes, washing the aluminum silicate fibers for 3 minutes by using absolute ethyl alcohol, and then placing the aluminum silicate fibers in an oven to dry for 2 hours at normal temperature to obtain pretreated aluminum silicate fibers; adding the pretreated aluminum silicate fiber into a modifier solution consisting of yttrium chloride, hydrofluoric acid and water, heating to 55 ℃, stirring for 35 minutes, taking out, washing for 3 minutes by absolute ethyl alcohol and deionized water respectively, transferring into an oven for drying at 100 ℃ for 2 hours, taking out, crushing and sieving by a 20-mesh sieve to obtain the modified aluminum silicate fiber.
2. A fiber reinforced cemented carbide according to claim 1 wherein: the binder is cobalt powder.
3. A fiber reinforced cemented carbide according to claim 1 wherein: in the preparation step of the modified aluminum silicate fiber, the mass concentration of an acetone solution is 5%, and the mass ratio of the broken aluminum silicate fiber to the acetone solution is 1: 15; in the modifier solution, the mass ratio of yttrium chloride, hydrofluoric acid and water is 1:2:100, and the mass ratio of the pretreated aluminum silicate fiber to the modifier solution is 1: 30.
4. A fiber reinforced cemented carbide according to claim 1 wherein: the grain growth inhibitor consists of tantalum carbide and niobium carbide in a mass ratio of 1: 1.
5. The method for producing a fiber-reinforced hard alloy according to any one of claims 1 to 4, wherein: the method comprises the following steps:
s1, weighing raw materials according to weight percentage, mixing the raw materials to obtain alloy powder, adding the alloy powder into a ball mill, sequentially adding a forming agent, oleic acid, alcohol and a ball milling rod, and carrying out ball milling for 36-60 hours to obtain slurry;
s2, passing the slurry obtained in the step S1 through a 325-mesh screen, adding the slurry into a closed spray drying tower, and performing spray drying to obtain an alloy mixture;
s3, adding the alloy mixture obtained in the step S2 into a horizontal extruder, and extruding and forming to obtain a blank;
and S4, drying the blank obtained in the step S3, then placing the dried blank into a pressure sintering furnace, dewaxing and sintering for 60-90 minutes, then sintering for 45-60 minutes in vacuum, and finally sintering for 60-75 minutes in a pressure manner to obtain the fiber reinforced hard alloy.
6. The method for preparing a fiber-reinforced cemented carbide according to claim 5, wherein: in the step S1, the forming agent is paraffin, and the mass ratio of the alloy powder, the paraffin, the oleic acid, the alcohol and the ball grinding rod is 100:1:8:25: 500.
7. The method for preparing a fiber-reinforced cemented carbide according to claim 5, wherein: in the step S2, the gas introduced during spray drying is nitrogen, the air inlet temperature is 220 ℃, the air outlet temperature is 120 ℃, and the feeding speed is 1.8 kg/min.
8. The method for preparing a fiber-reinforced cemented carbide according to claim 5, wherein: in the step S3, the pressure during extrusion molding is 25MPa, and the time is 10-15 minutes.
9. The method for preparing a fiber-reinforced cemented carbide according to claim 5, wherein: in the step S4, the temperature during dewaxing and sintering is 650 ℃, and the pressure is 10 mbar; the temperature during vacuum sintering is 1150 ℃, and the pressure is 0.1 mbar;
the temperature during pressure sintering was 1300 ℃ and the pressure was 4 MPa.
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