CN114749663B - Preparation method of prealloy powder for superfine alumina coated diamond tool - Google Patents
Preparation method of prealloy powder for superfine alumina coated diamond tool Download PDFInfo
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- CN114749663B CN114749663B CN202210433201.5A CN202210433201A CN114749663B CN 114749663 B CN114749663 B CN 114749663B CN 202210433201 A CN202210433201 A CN 202210433201A CN 114749663 B CN114749663 B CN 114749663B
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- 239000000843 powder Substances 0.000 title claims abstract description 67
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 65
- 239000010432 diamond Substances 0.000 title claims abstract description 65
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 238000005229 chemical vapour deposition Methods 0.000 claims abstract description 6
- 238000005243 fluidization Methods 0.000 claims abstract 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 37
- 239000007789 gas Substances 0.000 claims description 32
- -1 aluminum halide Chemical class 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 239000012159 carrier gas Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000011068 loading method Methods 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 claims description 4
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims description 4
- CECABOMBVQNBEC-UHFFFAOYSA-K aluminium iodide Chemical compound I[Al](I)I CECABOMBVQNBEC-UHFFFAOYSA-K 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 3
- 229910020646 Co-Sn Inorganic materials 0.000 claims description 2
- 229910020709 Co—Sn Inorganic materials 0.000 claims description 2
- 229910017755 Cu-Sn Inorganic materials 0.000 claims description 2
- 229910017927 Cu—Sn Inorganic materials 0.000 claims description 2
- 229910002549 Fe–Cu Inorganic materials 0.000 claims description 2
- 229910018100 Ni-Sn Inorganic materials 0.000 claims description 2
- 229910018532 Ni—Sn Inorganic materials 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- PUGUQINMNYINPK-UHFFFAOYSA-N tert-butyl 4-(2-chloroacetyl)piperazine-1-carboxylate Chemical compound CC(C)(C)OC(=O)N1CCN(C(=O)CCl)CC1 PUGUQINMNYINPK-UHFFFAOYSA-N 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000004663 powder metallurgy Methods 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 14
- 239000000956 alloy Substances 0.000 description 14
- 239000007788 liquid Substances 0.000 description 7
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000007767 bonding agent Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/403—Oxides of aluminium, magnesium or beryllium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/4417—Methods specially adapted for coating powder
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/442—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using fluidised bed process
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention relates to a preparation method of prealloy powder for superfine alumina-coated diamond tools, which comprises the steps of fluidization arrangement, chemical vapor deposition and the like. The obtained product has the advantages of low impurity content, uniform and compact coating, controllable content and simple process, and is suitable for large-scale industrial production. And the prealloyed powder for the superfine alumina coated diamond tool can obviously improve the wear resistance and the service life of the diamond tool in the subsequent powder metallurgy process.
Description
Technical Field
The invention belongs to the technical field of powder surface modification, relates to a preparation method of prealloy powder for a coated diamond tool, and in particular relates to a preparation method of prealloy powder for a superfine alumina coated diamond tool.
Background
The diamond tool is a superhard material obtained by compounding metal or alloy with diamond powder and then sintering and forming, has a plurality of excellent performances such as high hardness, high wear resistance, high toughness and the like, is widely applied to engineering fields such as precision manufacturing, land mine exploration, stone processing and the like, and has important importance in modern manufacturing industry and industrial development in China. In the service process of the diamond tool, sharpness and service life are two key indexes of the diamond tool, and are mainly controlled by matching degree between the abrasion rate of the matrix and the processed material. However, the following problems still remain with respect to matching degree deployment: the hardness and the wear resistance of the alloy matrix are far lower than those of the diamond particles, the diamond particles often fall off rapidly due to insufficient holding force of the alloy matrix in the use process, and the fallen diamond particles can wear the alloy matrix in turn, so that the service life is prolonged.
In diamond tools, the alloy matrix volume ratio exceeds 65%, which is the decisive factor for ensuring the holding force and sharpness of diamond particles and the most important raw material basis. At present, a certain content of high-hardness and high-wear-resistance particles are mainly mixed into prealloyed powder to be used as a reinforcing phase. Alumina has high hardness and high wear resistance, and may be used as reinforcing material for diamond tool. However, because of the huge density difference between the alumina and the prealloyed powder, the problem of component segregation often exists in the mixing process, and the alumina is easily biased in the sintering process, so that local stress concentration in the material is caused to generate cracks, and the processability, the mechanical property and the service life are seriously affected. Chinese patent publication No. CN107838417A discloses an iron-aluminum-based bonding agent diamond tool and a preparation method thereof, wherein the technical scheme of sintering Fe-Al bonding agent mixed powder, cu-Sn prealloy powder, diamond abrasive and other auxiliary agents to obtain the diamond tool is adopted, and the diamond tool with high temperature resistance, corrosion resistance and low specific gravity is prepared, but the technical problem of material segregation is not solved. Therefore, how to obtain a dispersion-distributed fine alumina-enhanced diamond tool is key to improving performance and lifetime.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of prealloy powder for a superfine alumina coated diamond tool, the powder prepared by the method has a typical core-shell structure, a surface alumina coating layer consists of nano-scale alumina particles, the nano-scale alumina particles are uniformly distributed on the surface of prealloy powder, the content is controllable, and the prealloy powder is suitable for industrial mass production.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a preparation method of prealloyed powder for superfine alumina coated diamond tools comprises the following steps:
(1) And (3) preparing and treating prealloyed powder for the diamond tool, wherein the prealloyed powder for the diamond tool is one or more of Fe-Cu, fe-Cu-Sn, fe-Cu-Ni-Sn and Fe-Cu-Co-Sn, and sieving the prealloyed powder for the diamond tool, wherein the granularity of the sieved prealloyed powder for the diamond tool is 5-50 mu m (preferably 10-50 mu m).
(2) Heating the fluidized bed reactor to 50-400 ℃, adding the prealloyed powder for the diamond tool, which is obtained in the step (1), into the fluidized bed reactor, introducing fluidizing gas upwards from the bottom end of the fluidized bed reactor, and evacuating air by using the fluidizing gas, wherein the fluidizing gas is a mixed gas of inert gas and water vapor, and meanwhile, the prealloyed powder for the diamond tool is in a fluidized state.
(3) Heating an aluminum halide serving as an aluminum source to form aluminum halide vapor, carrying out loading on the aluminum halide vapor by taking inert gas as carrier gas, introducing the aluminum halide vapor into a fluidized bed reactor, carrying out chemical vapor deposition reaction on the aluminum halide vapor and excessive water vapor in the mixed gas introduced in the step (2) in the fluidized bed reactor, and depositing the aluminum halide vapor on prealloy powder for diamond tools, wherein the chemical vapor deposition reaction time is 5-200 min, so as to obtain prealloy powder for superfine alumina coated diamond tools, and the loading amount of the aluminum halide is such that the coating amount of superfine alumina coated outside the finally obtained prealloy powder is 0.1-30wt%.
Preferably, the flow rate of the fluidizing gas is 0.4 to 1.0L/min calculated as the ratio of prealloyed powder for each 20g of diamond tool, wherein the volume ratio of the two gases is inert gas: water vapor= (1 to 10): 1.
Preferably, the prealloyed powder for the diamond tool in the step (1) is prepared by the following preparation method: 1, melting a metal raw material into an alloy liquid through a heating furnace in an inert atmosphere; 2, pouring the alloy liquid prepared in the step 1 into a ladle with a through hole at the bottom, atomizing the alloy liquid into fine alloy liquid drops through high-speed inert gas or high-speed water sprayed towards the flowing alloy liquid in the flowing process of the alloy liquid from the through hole, and pouring the fine alloy liquid drops into a collecting cylinder to be solidified into alloy powder; further preferably, the method further comprises 3, annealing the alloy powder obtained in the step 2 to obtain prealloyed powder for the diamond tool.
Preferably, the inert gas in the fluidizing gas is argon, and the carrier gas is argon.
Preferably, the prealloyed powder for diamond tools has a particle size in the range of 10 to 50 μm.
Preferably, the aluminum halide is one of aluminum fluoride, aluminum chloride, aluminum bromide or aluminum iodide.
Preferably, the purity of the aluminum halide is 98% to 99.9999%.
Preferably, in step (3), the heating temperature of the vapor for heating the aluminum source to form the aluminum halide is 20 to 100 ℃. The aluminum halide as the aluminum source cannot be directly gasified, the concentration of the direct gasification is too high, the reaction is not well controlled, the substances (aluminum halide) have certain vapor pressure at low temperature, a small amount of vapor phase aluminum source can be obtained, the reaction is well controlled by taking the small amount of vapor phase aluminum source obtained at the low temperature as a raw material, and the plating effect is also good.
Preferably, the flow rate of the carrier gas carrying the vapor of the aluminum halide in step (3) is 0.2 to 0.6L/min, calculated as a ratio of prealloyed powder for each 20g of diamond tool.
Preferably, the mass percentage of the alumina coating amount in the prealloyed powder for the superfine alumina-coated diamond tool is 0.5 to 30 percent.
The prealloyed powder for the superfine alumina coated diamond tool is prepared by adopting the preparation method.
The invention has the following beneficial effects:
the prealloy powder for the diamond tool is used as a matrix, and a fluidized bed technology is combined, and superfine alumina is deposited on the surface of the prealloy powder for the diamond tool by a chemical vapor deposition method, so that the prealloy powder for the diamond tool coated by the superfine alumina is prepared. By the specific steps and parameter setting of the method, the prealloy powder for the superfine alumina coated diamond tool has the advantages of uniform and compact coating and controllable content, and the whole process is simple, thereby being suitable for large-scale industrial production. And the coated prealloyed powder remarkably improves the wear resistance and the service life of the diamond tool in the subsequent powder metallurgy process.
According to the invention, by reasonably arranging the aluminum source and the water vapor raw material, the aluminum source and the water vapor raw material are subjected to vapor deposition while reacting, the preparation process is simple, the production cost is low, and the large-scale production and continuous operation are easy to realize. By setting the fluidized bed reaction as a closed system, the whole reaction process is isolated from the outside, and impurity elements are not easy to introduce, so that the purity of the alumina coating is ensured. By reasonably setting the parameters of each step, the aluminum oxide coating layer deposited on the surface of the prealloyed powder for the diamond tool in situ has high coating integrity and strong interface bonding capability of the aluminum oxide coating layer and the prealloyed powder. By adjusting the reaction temperature, the addition amount of an aluminum source, the operation gas speed, the deposition time and other parameters, controllable coating of the aluminum oxide coating layer can be realized in a range according to requirements, and the mass fraction and the thickness of the coated aluminum oxide can be reasonably adjusted.
Drawings
Fig. 1 is a field emission scanning electron microscope image of prealloyed powder for ultra fine alumina coated diamond tools of example 1.
Detailed Description
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. Each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise. The description is only intended to aid in the understanding of the invention and should not be taken as limiting the invention in any way.
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1:
heating the fluidized bed reactor to a reaction temperature of 100 ℃, adding 20.0g of prealloy powder for diamond tools with a particle size of 20 mu m into the fluidized bed, wherein the fluidizing gas is a mixed gas of argon and steam, the gas speed is 0.6L/min, the ratio of the argon to the steam is 3:1, aluminum fluoride is used as an aluminum source, heating is carried out at the temperature of 30 ℃, the aluminum fluoride steam is used as carrier gas, the gas speed of the carrier gas is 0.4L/min, loading the carrier gas into the fluidized bed, reacting with the steam in the fluidized bed, the reaction time is 40min, and obtaining the prealloy powder for the superfine alumina coated diamond tools, and tail gas enters a treatment system through a pipeline. The content of alumina in the obtained composite powder is 3 percent according to the content measurement of elements.
The field emission scanning electron microscope of prealloyed powder for ultra-fine alumina coated diamond tool is shown in fig. 1, and it can be seen from fig. 1 that the prealloyed powder surface is completely deposited with alumina.
Example 2:
heating the fluidized bed reactor to a reaction temperature of 300 ℃, adding 20.0g of prealloy powder for diamond tools with a particle size of 30 mu m into the fluidized bed, wherein the fluidizing gas is a mixed gas of argon and steam, the gas speed is 0.4L/min, the ratio of the argon to the steam is 2:1, aluminum chloride is used as an aluminum source, heating is carried out at the temperature of 50 ℃, the aluminum chloride steam is used as carrier gas, the gas speed of the carrier gas is 0.2L/min, loading the carrier gas into the fluidized bed, reacting with the steam in the fluidized bed for 10min, obtaining prealloy powder for superfine alumina coated diamond tools, and enabling tail gas to enter a treatment system through a pipeline. The content of alumina in the obtained composite powder is 0.5 percent according to the content measurement of elements.
Example 3:
heating the fluidized bed reactor to a reaction temperature of 400 ℃, adding 20.0g of prealloy powder for diamond tools with a particle size of 50 mu m into the fluidized bed, wherein the fluidizing gas is a mixed gas of argon and steam, the gas speed is 1.0L/min, the ratio of the argon to the steam is 10:1, aluminum iodide is used as an aluminum source, heating is carried out at the temperature of 70 ℃, the aluminum iodide steam is used as a carrier gas, the gas speed of the carrier gas is 0.6L/min, loading the carrier gas into the fluidized bed, reacting with the steam in the fluidized bed, the reaction time is 200min, obtaining prealloy powder for superfine alumina coated diamond tools, and the tail gas enters a treatment system through a pipeline. The content of alumina in the obtained composite powder is 30 percent according to the content measurement of elements.
Claims (3)
1. The preparation method of the prealloyed powder for the superfine alumina coated diamond tool is characterized by comprising the following steps of:
(1) Preparing and treating prealloy powder for the diamond tool, wherein the prealloy powder for the diamond tool is one or more of Fe-Cu, fe-Cu-Sn, fe-Cu-Ni-Sn and Fe-Cu-Co-Sn, and sieving the prealloy powder for the diamond tool, wherein the granularity of the sieved prealloy powder is 5-50 mu m;
(2) Heating a fluidized bed reactor to 50-100 ℃, adding the prealloyed powder for the diamond tool, which is obtained in the step (1), into the fluidized bed reactor, wherein the fluidized bed reactor is a closed device, introducing fluidizing gas upwards from the bottom end of the fluidized bed reactor, evacuating air by using the fluidizing gas, and simultaneously enabling the prealloyed powder for the diamond tool to be in a fluidized state, wherein the fluidizing gas is a mixed gas of inert gas and water vapor;
the flow rate of the fluidization gas is 0.4-1.0L/min, wherein the volume ratio of the two gases is that of inert gas, namely water vapor= (1-10) 1;
(3) Heating an aluminum halide serving as an aluminum source to form aluminum halide vapor, carrying out loading on the aluminum halide vapor by taking inert gas as carrier gas, introducing the aluminum halide vapor into a fluidized bed reactor, performing chemical vapor deposition reaction on the aluminum halide vapor and excessive water vapor in the mixed gas introduced in the step (2) in the fluidized bed reactor, and depositing the aluminum halide vapor on prealloy powder for a diamond tool, wherein the chemical vapor deposition reaction time is 40-200 min, so as to obtain prealloy powder for a superfine aluminum oxide coated diamond tool, and the introducing amount of the aluminum halide is such that the coating amount of superfine aluminum oxide coated outside the finally obtained prealloy powder is 3-30wt%;
the aluminum halide is one of aluminum fluoride, aluminum bromide or aluminum iodide;
the purity of the aluminum halide is 98% -99.9999%;
heating an aluminum source to form aluminum halide vapor at a heating temperature of 20-100 ℃;
the flow rate of carrier gas carrying the vapor of aluminum halide is 0.2-0.6L/min.
2. The method of preparing prealloyed powder for superfine alumina-coated diamond tools according to claim 1, wherein the inert gas in the fluidizing gas is argon, and the carrier gas is argon.
3. The method for preparing prealloyed powder for ultra fine alumina coated diamond tools according to claim 1, wherein the prealloyed powder for diamond tools has a particle size ranging from 10 μm to 50 μm; the mass percentage of the alumina coating amount in the prealloyed powder for the superfine alumina coated diamond tool is 30 percent.
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| GB867479A (en) * | 1958-03-24 | 1961-05-10 | British Titan Products | Process for improving titanium dioxide pigments |
| KR930018048A (en) * | 1992-02-07 | 1993-09-21 | 김훈철 | Method and apparatus for diffusion coating carbide by powder fluidized bed furnace |
| US6461564B1 (en) * | 1999-11-16 | 2002-10-08 | Morris F. Dilmore | Metal consolidation process applicable to functionally gradient material (FGM) compositions of tantalum and other materials |
| CA2603458A1 (en) * | 2006-09-21 | 2008-03-21 | Smith International, Inc. | Atomic layer deposition nanocoatings on cutting tool powder materials |
| CN108531884A (en) * | 2018-05-25 | 2018-09-14 | 中国科学院过程工程研究所 | A kind of cobalt coating ceramic alloy-based composite hard raw powder's production technology |
| CN108675300A (en) * | 2018-06-15 | 2018-10-19 | 清华大学 | A kind of nuclear shell structure nano composite particles and preparation method thereof, its preparation facilities |
| CN109647293A (en) * | 2018-11-07 | 2019-04-19 | 中国科学院过程工程研究所 | A kind of system and method for anode material for lithium-ion batteries metal oxide coating modification |
| CN109351964A (en) * | 2018-12-18 | 2019-02-19 | 吉林大学 | Compound iron-based powder with nucleocapsid structure and its preparation method and application |
| CN112453413A (en) * | 2020-11-20 | 2021-03-09 | 中科院过程工程研究所南京绿色制造产业创新研究院 | Preparation method of oxide dispersion strengthened steel spherical powder for 3D printing |
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