CN111172434A - Method for reducing content of aluminum oxide in aluminum-based composite material by coating potassium fluozirconate on surface of silicon-plated graphite - Google Patents
Method for reducing content of aluminum oxide in aluminum-based composite material by coating potassium fluozirconate on surface of silicon-plated graphite Download PDFInfo
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Abstract
The invention provides a method for reducing the content of alumina in an aluminum-based composite material by coating potassium fluozirconate on the surface of silicon-plated graphite, which comprises the steps of firstly preparing the silicon-plated graphite, then coating a layer of potassium fluozirconate on the surface of the silicon-plated graphite, using the silicon-plated graphite coated with the potassium fluozirconate as a reinforcing phase, preparing a crystalline flake graphite/aluminum-based composite material by adopting a vacuum air pressure infiltration process, and eliminating the alumina by the chemical reaction of the potassium fluozirconate and the alumina. The invention solves the problem that the furnace body can not be opened to eliminate alumina in the aluminum liquid infiltration stage, the integrality of the coating and the plating layer can be reacted by testing the distribution of the three elements on the surface of the scale graphite, the Zr element can refine aluminum crystal grains and reduce the pinhole tendency of aluminum alloy, the generated AlZrSi is an alloy phase formed by a plurality of substances, the interface binding force is improved, and the coating is simple.
Description
Technical Field
The invention belongs to the field of aluminum matrix composite materials, and relates to a preparation process of an aluminum matrix composite material.
Background
The development of components in the fields of microelectronic technology, aerospace, packaged batteries and the like tends to be miniaturized, high in speed and high in reliability, the traditional heat dissipation material is difficult to meet the current use requirement, and the use of materials with high heat conductivity, low density and low thermal expansion coefficient is a necessary trend in the future. Under the background, the aluminum matrix composite material has the advantages of good thermal conductivity, high specific strength, controllable and low thermal expansion coefficient, excellent wear resistance and the like, so that the advantages are gradually shown. At present, the melt infiltration method is a process capable of stably and continuously producing the aluminum matrix composite, and for example, a patent (publication number: CN104388765A) applied to Harbin university of industry describes that the extrusion casting method is used for preparing the pure titanium particle reinforced aluminum matrix composite with low volume fraction; the patent of Nanchang aviation university (publication No. CN110230012A) describes a vacuum pressure infiltration forming method of a fiber reinforced aluminum matrix composite.
However, when the graphite reinforced aluminum matrix composite is prepared by adopting the process, the following three problems need to be solved are faced: (1) the degree of contact angle can be used to determine the degree of wetting between the two materials, with lower degrees indicating greater wetting. At normal temperature, the wetting angle of the graphite and the aluminum is 160 degrees, in addition, impurities such as oil stains exist on the surface of the graphite, and the adverse factors can further reduce the contact of the graphite and the aluminum. Therefore, the wettability between the scale graphite and the aluminum is poor, so that the aluminum liquid easily flows out from the gaps of the preform during the infiltration of the molten aluminum. (2) Under the condition of high temperature, the graphite reacts with the aluminum liquid to generate Al4C3. Formed Al4C3Although a hard ceramic phase, it is a harmful product for composite materials, and its brittle phase, which has low thermal conductivity and is easily degraded by moisture absorption, will increase fatigue damage, and cause the generated cracks to expand, thereby resulting in a decrease in interface strength. (3) In the infiltration stage of molten aluminum, the prefabricated body is placed into the furnace body and vacuumized, and the furnace body is totally closed until the infiltration cooling is finished. In the process of gradually heating the aluminum alloy from normal temperature to melting, even under the condition of vacuum pumping, when the vacuum degree is not less than 0.01Pa, a layer of thick Al is formed on the surface of the aluminum liquid when the aluminum liquid is contacted with air2O3And impurities in the alloy can float on the surface of the aluminum liquid in the long-time heat preservation process, but cannot be treated. When the crucible is moved upwards for infiltration, Al will be generated2O3The alumina is brought together with impurities, has poor thermophysical performance, has the thermal conductivity of only 34W/(m.K), is easy to absorb moisture, and has influence on the thermal conductivity of the material if a large amount of the alumina exists in the composite material.
For the difficult problems of poor wettability between graphite and aluminum and unfavorable interface reaction, the most adopted method at present is to plate metal or ceramic elements on the surface of graphite, part of the plating elements can react with graphite to generate corresponding carbides, and the generated carbides are generally bonded with graphite through chemical bonds, so the bonding force between the two is strong.
The research on the coating is quite mature and intensive, the problems of interface reaction and wettability are well controlled, and the third problem mentioned above, namely how to reduce the content of alumina generated by oxidation in the process of heating and melting aluminum, has no relevant patent and literature reports at present.
According to a large amount of data, potassium fluozirconate is found to be commonly used for producing magnesium-aluminum alloy, refractory materials, ceramics and glass and can also be used as a catalyst and a welding agent, and a patent (publication number: CN109371389A) applied by four-dimensional chemical industry limited company in Huizhou city records a passivation method of environment-friendly aluminum and aluminum alloy, potassium fluozirconate is added into an aluminum alloy passivation solution, on the premise that a passivation film with a compact structure is generated to ensure the corrosion resistance of a workpiece, products in the operation process basically have no harm to the health of a human body, waste liquid has no pollution to the environment, and the use safety of the products is greatly improved. However, no relevant report is found for applying the composite material to the preparation of the composite material at present.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for reducing the content of alumina in an aluminum-based composite material by coating potassium fluozirconate on the surface of silicon-plated graphite.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
(1) sodium hydroxide, sodium carbonate, sodium phosphate, crystalline flake graphite and deionized water are mixed according to the mass ratio of 1 (0.2-0.3) to (0.2-0.3): (4-6) heating to 100 ℃ after mixing, uniformly stirring, washing with distilled water until the pH of the solution is neutral, and performing suction filtration and drying;
(2) immersing the crystalline flake graphite treated in the step (1) in concentrated sulfuric acid, heating to 100 ℃, uniformly stirring, washing with distilled water until the pH of the solution is neutral, filtering, and drying;
(3) mixing the crystalline flake graphite in the step (2) with potassium chloride, sodium chloride and silicon powder according to a molar ratio of 1 (0.4-0.6) to (0.1-0.5), heating to 1150 ℃ at a speed of 3 ℃/min under the protection of nitrogen, preserving heat for 1.5h, taking out after naturally cooling to room temperature, cleaning the sintered mixed powder with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying to obtain silicon-plated crystalline flake graphite;
(4) mixing potassium fluozirconate and deionized water according to the mass ratio (0.005-0.01): 1, weighing and mixing; heating the obtained potassium fluozirconate aqueous solution to 95 ℃, and continuously stirring the solution until the solution is transparent in the heating process; adding the silicon-plated crystalline flake graphite obtained in the step (3) into a potassium fluorozirconate aqueous solution, stirring at the temperature of 95 ℃ to coat potassium fluorozirconate on the silicon-plated crystalline flake graphite, cooling the potassium fluorozirconate aqueous solution to room temperature after coating is finished, cleaning with distilled water until the pH of the solution is neutral, and performing suction filtration and drying to obtain the silicon-plated crystalline flake graphite coated with potassium fluorozirconate.
And (2) mixing sodium hydroxide, sodium carbonate, sodium phosphate, crystalline flake graphite and deionized water, heating to 100 ℃, and stirring for 15 min.
The flake graphite used in the step (1) is 45 meshes.
And (2) heating concentrated sulfuric acid to 100 ℃, and stirring for 15 min.
The concentrated sulfuric acid used in the step (2) is analytically pure.
The potassium chloride, the sodium chloride and the silicon powder used in the step (3) are analytically pure.
And (4) adding the silicon-plated crystalline flake graphite into a potassium fluozirconate aqueous solution, and stirring for 1 h.
The potassium fluorozirconate used in the step (4) is analytically pure.
The invention has the beneficial effects that: the silicon-plated crystalline flake graphite is prepared by a salt bath plating process, and then a crystalline flake graphite preform coated with potassium fluozirconate on the surface is prepared by utilizing an aqueous solution of potassium fluozirconate, so that compared with the traditional crystalline flake graphite which is only subjected to plating treatment, the silicon-plated crystalline flake graphite has the following advantages: (1) under high temperature conditions, the potassium fluorozirconate can undergo chemical reaction: k2ZrF6→2KF+ZrF4；ZrF4+2H2O→ZrO2+4HF；6HF+Al2O3→2AlF3+3H2And O, the alumina can be dissolved through the continuous reaction, and the problem that the furnace body cannot be opened to eliminate the alumina in the aluminum liquid infiltration stage is solved. (2) For the silicon-plated graphite/aluminum-based composite material system, since the aluminum alloy usually contains a certain amount of silicon, the plating layer on the surface of the scale graphite is also silicon, and the newly added potassium fluozirconate coating contains F, K, Zr elements, the integrity of the coating layer and the plating layer can be reflected by testing the distribution of the three elements on the surface of the scale graphite. (3) Zr element can refine aluminum crystal grains and reduce the pinhole tendency of the aluminum alloy. (4) In the infiltration stage of molten aluminum, the contact of potassium fluozirconate and the molten aluminum can generate chemical reaction: 3K2ZrF6+4Al→6KF·4AlF4+3Zr is silicon-plated flake graphite, and when Si element is present in the system, Zr reacts with Si and Al further: zr + Al + SiC → AlZrSi, the generated AlZrSi is not a new substance, but an alloy phase formed by several substances, and the interface bonding force is improved. (5) The density of the potassium fluorozirconate is 3.48g/cm3The chemical stability in air is good, the melting point is 840 ℃, which is higher than 700 ℃ when the aluminum liquid is infiltrated, and simultaneously, the aluminum liquid is easy to dissolve in water, the preparation of the solution is more convenient, and the coating is simple.
Drawings
FIG. 1 is an XPS plot of potassium fluorozirconate after sintering in admixture with alumina powder, wherein (a) is the full spectrum; (b) is the Al peak;
FIG. 2 is K2ZrF6SEM picture and elemental analysis of the silicon-plated flake graphite after coating, wherein (a) is the micro-morphology, (b) is the EDS energy spectrum, (C) is the C element, (d) is the Si element, (e) is the F element;
FIG. 3 is K2ZrF6SEM images and elemental distributions of the coated silicon-plated graphite/aluminum-based composite layer planes, wherein (a) is the microstructure, (b) is the C element, (C) is the Al element, (d) is the Si element, (e) is the F element, and (F) is the EDS energy spectrum;
FIG. 4 is a flow chart of the preparation of a silicon-coated graphite/aluminum-based composite coated with potassium fluorozirconate.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
The invention prepares the silicon-plated graphite with the potassium fluozirconate coating by coating the potassium fluozirconate on the surface of the silicon-plated graphite.
The invention provides a method for coating potassium fluozirconate on the surface of silicon-plated graphite, which comprises the following steps:
(1) sodium hydroxide, sodium carbonate, sodium phosphate, crystalline flake graphite and deionized water are mixed according to the mass ratio of 1: 0.2-0.3: weighing 4-6, putting into a 1L beaker, heating to 100 ℃, stirring for 15min, washing with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying for later use.
(2) Pouring the graphite in the step (1) into a beaker, adding concentrated sulfuric acid with the mass concentration of 98% until the graphite is submerged, heating to 100 ℃, stirring for 15min, cleaning with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying for later use.
(3) Sequentially weighing the crystalline flake graphite, the potassium chloride, the sodium chloride and the silicon powder in the step (2) according to a molar ratio of 1: 0.4-0.6: 0.1-0.5, adding the weighed materials into a porcelain shaft, placing the porcelain shaft into a high-temperature tube furnace, heating to 1150 ℃ at a speed of 3 ℃/min under the protection of nitrogen, preserving heat for 1.5 hours, naturally cooling to room temperature, taking out, cleaning the sintered mixed powder with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying to obtain the silicon-plated crystalline flake graphite.
(4) Mixing potassium fluozirconate and deionized water according to the mass ratio of 0.005-0.01: 1, weighing and then placing into a beaker; heating the potassium fluozirconate aqueous solution to 95 ℃, and continuously stirring the solution until the solution is transparent in the heating process. And (3) adding the silicon-plated crystalline flake graphite in the step (3) into a potassium fluozirconate aqueous solution, stirring for 1h at the temperature of 95 ℃, cooling the potassium fluozirconate aqueous solution to room temperature after coating, washing with distilled water until the pH of the solution is neutral, and then performing suction filtration and drying to obtain the silicon-plated crystalline flake graphite coated with the potassium fluozirconate.
The flake graphite used in the step (1) is 45 meshes.
The concentrated sulfuric acid used in the step (2) is analytically pure.
And (4) the potassium chloride, the sodium chloride and the silicon powder used in the step (3) are analytically pure.
The potassium fluorozirconate used in the step (4) is analytically pure.
Example 1: test whether Potassium fluozirconate has an eliminating effect on alumina
(1) Weighing 4.2g of potassium fluozirconate and 1g of alumina, uniformly mixing, putting into a ceramic shaft, and putting into a high-temperature tube furnace. (2) Under the protection of nitrogen, the temperature of the tube furnace is raised to 700 ℃ at the speed of 3 ℃/min, the temperature is kept for 2h, and the ceramic shaft is taken out after being cooled to the room temperature. (3) And (3) carrying out XPS analysis on the sintered mixed powder in the step (2) to fit the peak of aluminum. FIG. 1 is K2ZrF6With Al2O3XPS measurement results after sintering of mixed powder: elemental detection was performed on the sintered powder, and the results included Al, Zr, K, O, and F. Fig. 1(b) is a fitted image of an aluminum peak, and as can be seen from the figure, the peak value is low at 74.3eV (O ═ Al — O standard electron binding energy), and the analysis result shows that K is low2ZrF6Can reduce Al2O3The content of (a).
Example 2: coating potassium fluozirconate (1) on the surface of silicon-plated flake graphite
(1) Weighing 100g of sodium hydroxide, 25g of anhydrous sodium carbonate, 25g of sodium phosphate and 25g of 45-mesh crystalline flake graphite, putting the materials into a 1L beaker, adding deionized water to 1L, heating to 100 ℃, stirring for 15min, washing with distilled water until the pH value of the solution is neutral, and then carrying out suction filtration and drying for later use. (2) Pouring the graphite in the step (1) into a beaker, adding concentrated sulfuric acid until the graphite is submerged, heating to 100 ℃, stirring for 15min, cleaning with distilled water until the pH of the solution is neutral, and thenAnd carrying out suction filtration and drying for later use. (3) And (3) sequentially taking 20g of flake graphite, 48.70g of sodium chloride, 62.25g of potassium chloride and 2.93g of silicon powder in the step (2), putting a ceramic shaft into a high-temperature tube furnace, heating to 1150 ℃ at a speed of 3 ℃/min under the protection of nitrogen, preserving heat for 1.5h, naturally cooling to room temperature, taking out, cleaning the sintered mixed powder with distilled water until the pH of the solution is neutral and no obvious gray silicon powder is suspended in the solution, and then carrying out suction filtration and drying. (4) Weighing 5g of potassium fluozirconate powder, putting the potassium fluozirconate powder into a beaker, and adding 1kg of deionized water into the beaker; heating the potassium fluozirconate aqueous solution to 95 ℃, and continuously stirring in the heating process. (5) And (3) adding 20g of crystalline flake graphite in the step (3) into the potassium fluozirconate aqueous solution prepared in the step (4), stirring for 1h at the temperature of 95 ℃, cooling the potassium fluozirconate aqueous solution to room temperature after coating, washing with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying to obtain the silicon-plated crystalline flake graphite coated with the potassium fluozirconate. The analysis results of the F element show that: by K2ZrF6The coating process of the aqueous solution on the surface of the silicon-plated crystalline flake graphite is feasible.
Example 3: coating potassium fluozirconate (2) on the surface of the silicon-plated flake graphite
(1) Weighing 100g of sodium hydroxide, 25g of anhydrous sodium carbonate, 25g of sodium phosphate and 25g of 45-mesh crystalline flake graphite, putting the materials into a 1L beaker, adding deionized water to 1L, heating to 100 ℃, stirring for 15min, washing with distilled water until the pH value of the solution is neutral, and then carrying out suction filtration and drying for later use. (2) Pouring the graphite in the step (1) into a beaker, adding concentrated sulfuric acid until the graphite is submerged, heating to 100 ℃, stirring for 15min, washing with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying for later use. (3) And (3) sequentially taking 20g of flake graphite, 48.70g of sodium chloride, 62.25g of potassium chloride and 2.93g of silicon powder in the step (2), putting a ceramic shaft into a high-temperature tube furnace, heating to 1150 ℃ at a speed of 3 ℃/min under the protection of nitrogen, preserving heat for 1.5h, naturally cooling to room temperature, taking out, cleaning the sintered mixed powder with distilled water until the pH of the solution is neutral and no obvious gray silicon powder is suspended in the solution, and then carrying out suction filtration and drying. (4) Weighing 7.5g of potassium fluozirconate powder, putting the potassium fluozirconate powder into a beaker, and adding 1kg of deionized water into the beaker; heating the potassium fluozirconate aqueous solution to 95 ℃, and continuously stirring in the heating process. (5) Will be step (3)Adding 20g of crystalline flake graphite into the potassium fluozirconate aqueous solution prepared in the step (4), stirring for 1h at the temperature of 95 ℃, cooling the potassium fluozirconate aqueous solution to room temperature after coating, washing with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying to obtain the silicon-plated crystalline flake graphite coated with the potassium fluozirconate. The analysis results of the F element show that: by K2ZrF6The coating process of the aqueous solution on the surface of the silicon-plated crystalline flake graphite is feasible.
Example 4: coating potassium fluozirconate (3) on the surface of the silicon-plated flake graphite
(1) Weighing 100g of sodium hydroxide, 25g of anhydrous sodium carbonate, 25g of sodium phosphate and 25g of 45-mesh crystalline flake graphite, putting the materials into a 1L beaker, adding deionized water to 1L, heating to 100 ℃, stirring for 15min, washing with distilled water until the pH value of the solution is neutral, and then carrying out suction filtration and drying for later use. (2) Pouring the graphite in the step (1) into a beaker, adding concentrated sulfuric acid until the graphite is submerged, heating to 100 ℃, stirring for 15min, washing with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying for later use. (3) And (3) sequentially taking 20g of flake graphite, 48.70g of sodium chloride, 62.25g of potassium chloride and 2.93g of silicon powder in the step (2), putting a ceramic shaft into a high-temperature tube furnace, heating to 1150 ℃ at a speed of 3 ℃/min under the protection of nitrogen, preserving heat for 1.5h, naturally cooling to room temperature, taking out, cleaning the sintered mixed powder with distilled water until the pH of the solution is neutral and no obvious gray silicon powder is suspended in the solution, and then carrying out suction filtration and drying. (4) Weighing 10g of potassium fluozirconate powder, putting the potassium fluozirconate powder into a beaker, and adding 1kg of deionized water into the beaker; heating the potassium fluozirconate aqueous solution to 95 ℃, and continuously stirring in the heating process. (5) And (3) adding 20g of crystalline flake graphite in the step (3) into the potassium fluozirconate aqueous solution prepared in the step (4), stirring for 1h at the temperature of 95 ℃, cooling the potassium fluozirconate aqueous solution to room temperature after coating, washing with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying to obtain the silicon-plated crystalline flake graphite coated with the potassium fluozirconate. The analysis results of the F element show that: by K2ZrF6The coating process of the aqueous solution on the surface of the silicon-plated crystalline flake graphite is feasible.
Example 5: k2ZrF6The integrity of the coating of the coated silicon-plated graphite after the infiltration of the aluminum liquid is finishedSexual test
(1) Pouring 20g of the crystalline flake graphite obtained in the step (5) in the embodiment 2 into a mold, pressing under the pressure of 2.5MPa and the pressure maintaining time of 2h, and demolding to obtain a crystalline flake graphite green body. (2) And (2) putting the green body in the step (1) into a drying oven, initially heating to 150 ℃, preserving heat for 20min, controlling the sum of the heating time and the heat preservation time to be 15min when the temperature is increased by 30 ℃, cooling after the temperature is 330 ℃, and ending the sintering process to obtain the scale graphite prefabricated part. (3) Putting the flake graphite prefabricated part in the step (2) into a vacuum air pressure infiltration furnace, infiltrating molten aluminum liquid into the flake graphite prefabricated part under the conditions that the infiltration temperature is 700 ℃, the heat preservation time is 2 hours, and the infiltration pressure is 2.5MPa, cooling to room temperature, and opening the furnace to obtain the finished product coated with K2ZrF6The silicon-plated graphite/aluminum-based composite material. XPS analysis is carried out on the flake graphite in the step (3), and the result is shown in figure 3. The analysis result shows that: the potassium fluozirconate coating still completely wraps the surface of the graphite, which indicates that the coating is not damaged after being contacted with high-temperature molten aluminum.
Claims (8)
1. A method for reducing the content of aluminum oxide in an aluminum-based composite material by coating potassium fluozirconate on the surface of silicon-plated graphite is characterized by comprising the following steps:
(1) sodium hydroxide, sodium carbonate, sodium phosphate, crystalline flake graphite and deionized water are mixed according to the mass ratio of 1 (0.2-0.3) to (0.2-0.3): (4-6) heating to 100 ℃ after mixing, uniformly stirring, washing with distilled water until the pH of the solution is neutral, and performing suction filtration and drying;
(2) immersing the crystalline flake graphite treated in the step (1) in concentrated sulfuric acid, heating to 100 ℃, uniformly stirring, washing with distilled water until the pH of the solution is neutral, filtering, and drying;
(3) mixing the crystalline flake graphite in the step (2) with potassium chloride, sodium chloride and silicon powder according to a molar ratio of 1 (0.4-0.6) to (0.1-0.5), heating to 1150 ℃ at a speed of 3 ℃/min under the protection of nitrogen, preserving heat for 1.5h, taking out after naturally cooling to room temperature, cleaning the sintered mixed powder with distilled water until the pH of the solution is neutral, and then carrying out suction filtration and drying to obtain silicon-plated crystalline flake graphite;
(4) mixing potassium fluozirconate and deionized water according to the mass ratio (0.005-0.01): 1, weighing and mixing; heating the obtained potassium fluozirconate aqueous solution to 95 ℃, and continuously stirring the solution until the solution is transparent in the heating process; adding the silicon-plated crystalline flake graphite obtained in the step (3) into a potassium fluorozirconate aqueous solution, stirring at the temperature of 95 ℃ to coat potassium fluorozirconate on the silicon-plated crystalline flake graphite, cooling the potassium fluorozirconate aqueous solution to room temperature after coating is finished, cleaning with distilled water until the pH of the solution is neutral, and performing suction filtration and drying to obtain the silicon-plated crystalline flake graphite coated with potassium fluorozirconate.
2. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: and (2) mixing sodium hydroxide, sodium carbonate, sodium phosphate, crystalline flake graphite and deionized water, heating to 100 ℃, and stirring for 15 min.
3. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: the flake graphite used in the step (1) is 45 meshes.
4. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: and (2) heating concentrated sulfuric acid to 100 ℃, and stirring for 15 min.
5. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: the concentrated sulfuric acid used in the step (2) is analytically pure.
6. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: the potassium chloride, the sodium chloride and the silicon powder used in the step (3) are analytically pure.
7. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: and (4) adding the silicon-plated crystalline flake graphite into a potassium fluozirconate aqueous solution, and stirring for 1 h.
8. The method for reducing the content of alumina in the aluminum-based composite material by coating the surface of the silicon-plated graphite with the potassium fluorozirconate according to claim 1, wherein the method comprises the following steps: the potassium fluorozirconate used in the step (4) is analytically pure.
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| JPH01306533A (en) * | 1988-06-06 | 1989-12-11 | Toyota Motor Corp | Production of composite material of intermetallic compound |
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| CN102191411A (en) * | 2011-04-28 | 2011-09-21 | 上海交通大学 | Process for preparing aluminum-based composite material with infiltration enhancer |
| CN103484707A (en) * | 2013-09-23 | 2014-01-01 | 同济大学 | Preparation method for SiC particle reinforced aluminum-based composite material |
| CN104451240A (en) * | 2014-12-30 | 2015-03-25 | 南昌航空大学 | Preparation method of electronic packaging silicon carbide reinforced aluminum-based composite material |
| CN105734334A (en) * | 2016-04-15 | 2016-07-06 | 周凡 | Preparation method for aluminum matrix composite material |
| CN106623915A (en) * | 2016-11-11 | 2017-05-10 | 东睦新材料集团股份有限公司 | Activated sintering method of aluminum or aluminum alloy |
| CN106583654A (en) * | 2016-11-30 | 2017-04-26 | 北京天宜上佳新材料股份有限公司 | Aluminum alloy brake disc molten metal and technology for casting brake disc through aluminum alloy brake disc molten metal |
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