Aluminum-molybdenum-silicon alloy and production method thereof

Abstract

The present invention relates to the field of alloy materials and discloses an aluminum-molybdenum-silicon alloy and a production method thereof. The alloy contains 35-45 wt% molybdenum, 4-10 wt% silicon, and the remainder is aluminum, with iron ≤0.05 wt%, carbon ≤0.02 wt%, oxygen ≤0.01 wt%, and nitrogen ≤0.005 wt%. The aluminum-molybdenum-silicon alloy is prepared by mixing molybdenum trioxide and a by-product water glass solution in proportion and stirring uniformly; then slowly adding an ammonium sulfate solution, adjusting the pH, and reacting at high temperature; vacuum filtering the reaction solution, washing, drying, and sintering to obtain a MoO3 / SiO2 composite; and then mixing the MoO3 / SiO2 composite and aluminum powder in proportion and subjecting them to a vacuum thermite reaction to obtain the aluminum-molybdenum-silicon alloy. The present invention uses a low-modulus water glass solution containing sodium molybdate, a by-product of the molybdenum industry, as a raw material to prepare a MoO3 / SiO2 composite, and prepares an aluminum-molybdenum-silicon ternary alloy with high uniformity and low impurity content through a vacuum aluminothermic method. While achieving comprehensive resource utilization, it solves the problems of severe segregation and excessively high oxygen and nitrogen content in the production of aluminum-molybdenum-silicon alloys by traditional aluminothermic reactions, providing a new idea for the production of aluminum-molybdenum-silicon ternary master alloys.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy materials, and in particular to an aluminum-molybdenum-silicon alloy and a production method thereof. Background Art

[0002] Conventional water glass solution contains 56-60 wt% sodium silicate and a modulus between 1.5 and 3.5, making it a commonly used binder in industry. However, during molybdenum production, a by-product of water glass solution (containing 20 wt% sodium molybdate) contains 35 wt% sodium silicate and has a modulus between 0.4 and 1.5. Because this by-product contains excessively high levels of sodium molybdate and a low modulus, it cannot be used as a conventional binder, making subsequent processing difficult, resulting in wasteful resources and environmental pollution.

[0003] CN1629331A discloses an aluminum-molybdenum-silicon intermediate alloy and a preparation method thereof. The aluminum, metallic silicon, molybdenum oxide, potassium chlorate, and calcium fluoride are used as raw materials to produce the aluminum-molybdenum-silicon alloy by an aluminothermic reduction method. The alloy contains many inclusions, has a high gas impurity content, and is of low quality. CN101037741 discloses a production method for a vacuum-grade aluminum-molybdenum-silicon alloy. The aluminothermic reduction method is used to prepare an aluminothermic first-grade alloy, and the first-grade alloy is further refined in a medium-frequency vacuum induction furnace to obtain an aluminum-molybdenum-silicon alloy ingot. However, the molybdenum element segregation in the upper and lower parts of the produced aluminum-molybdenum-silicon alloy ingot is relatively large, ranging from 1 to 2.5 wt%, and the alloy quality is affected by the aluminothermic melt pool material and the medium-frequency vacuum induction furnace crucible material, which poses a quality risk during the use of high-quality titanium alloys.

[0004] Therefore, how to provide a high-quality aluminum-molybdenum-silicon alloy with a simple and easy-to-implement production method is an urgent problem that needs to be solved by workers in this field. Summary of the Invention

[0005] In view of this, the present invention provides an aluminum-molybdenum-silicon alloy and a production method thereof. The present invention can produce a high-quality aluminum-molybdenum-silicon alloy, which solves the problems of aluminum-molybdenum-silicon alloy produced by the thermite method having many inclusions, high gas impurity content and severe segregation.

[0006] Specifically, the present invention uses water glass solution, a byproduct of the molybdenum industry, as raw material to produce a uniformly dispersed MoO3 / SiO2 composite. Compared to conventional mixing of molybdenum trioxide and silicon oxide in a mixer, the MoO3 / SiO2 composite significantly improves the uniformity and stability of the resulting alloy ingots, ensuring high uniformity. Furthermore, a vacuum thermite reaction is used to produce a high-purity, low-gas impurity aluminum-molybdenum-silicon master alloy, providing a key material guarantee for my country's high-end titanium alloys.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for producing an aluminum-molybdenum-silicon alloy, comprising the following steps:

[0009] 1. Add molybdenum trioxide into the by-product water glass solution in proportion and stir thoroughly to obtain a suspension;

[0010] 2. Slowly add ammonium sulfate solution to the above suspension, stir evenly after adding, adjust the pH, transfer to a high-pressure reactor, react at high temperature, and then reduce the pressure and filter the mixed solution, wash, dry, and sinter to obtain a MoO3 / SiO2 composite;

[0011] 3. Mix the obtained MoO3 / SiO2 composite and aluminum powder in proportion, mix them thoroughly and put them into the crucible of a vacuum thermite furnace. Close the furnace body and start the Roots pump to evacuate the vacuum. Heat the crucible with a resistance wire to ignite the charge, and a vacuum thermite reaction will occur. After the reaction is completed, open the furnace and remove the slag to obtain an aluminum-molybdenum-silicon alloy ingot.

[0012] Preferably, the sodium silicate content in the by-product water glass solution is 35 wt%, the water glass modulus is 0.4-1.5, and the sodium molybdate content is 20 wt%.

[0013] Preferably, the weight ratio of the molybdenum trioxide to the water glass solution is (3.8-5.4):10. According to the content requirement of the aluminum-molybdenum-silicon alloy, molybdenum trioxide is supplemented to prepare a MoO3 / SiO2 composite with a corresponding ratio.

[0014] Preferably, the suspension is stirred at 20-80 rpm / min for 30-60 min to ensure that the molybdenum trioxide is evenly dispersed in the water glass solution.

[0015] Preferably, the content of ammonium sulfate in the ammonium sulfate solution is 50-65 wt%, the weight ratio of the ammonium sulfate solution to the by-product water glass solution is (3.9-5.2):10, and the amount of ammonium sulfate is determined based on the reaction formula of sodium molybdate and ammonium sulfate.

[0016] Na2MoO4 + (NH4)2SO4 → (NH4)2MoO4 + Na2SO4

[0017] Preferably, the pH of the suspension is adjusted to between 1.2 and 1.8 using a 35% hydrochloric acid solution, so that the hydrochloric acid reacts with the sodium silicate to neutralize the alkalinity and generate a large amount of silicon oxide seeds.

[0018] Na2O·nSiO2 + 2HCl → 2NaCl + H2O + nSiO2

[0019] Preferably, the suspension is transferred into a high-pressure reactor and reacted at 200-230° C. for 20-36 hours to allow ammonium molybdate to grow in situ on the silicon oxide.

[0020] Preferably, after the reaction is completed, the filter cake is obtained by vacuum filtration, washed with high-purity water until the pH of the washing liquid is greater than 6.8, the excess hydrochloric acid and sodium chloride are washed away, the filter cake is dried at 70-80 ° C for 10-24 h, the moisture is removed, and the filter cake is transferred to a muffle furnace at 400-550 ° C to decompose ammonium molybdate to generate molybdenum trioxide, which is grown in situ on the surface of silicon oxide and kept warm for 8-12 h to obtain a uniformly dispersed MoO3 / SiO2 composite.

[0021] (NH4)2MoO4→ 2NH3(g) + H2O(g) + MoO3(s)

[0022] Preferably, the iron content in the aluminum powder is less than 0.02 wt % to prevent the iron content in the aluminum powder from being too high and causing the iron content in the finished product to exceed the standard.

[0023] Preferably, the mass ratio of the MoO3 / SiO2 composite to the aluminum powder is (0.72-1.07):1, so as to ensure that the vacuum thermite reaction proceeds smoothly while the alloy content is within a controlled range.

[0024] Preferably, the crucible in the vacuum aluminothermic furnace is made of red copper to prevent impurities from being introduced into the alloy due to problems with the crucible material; the furnace body is closed and the mechanical pump is turned on to evacuate the furnace to a vacuum degree of <300 Pa to prevent the introduction of gaseous impurities such as oxygen and nitrogen into the alloy. At the same time, high vacuum provides negative pressure conditions for the alloy melt, which is conducive to the separation of alumina inclusions outside the alloy ingot; the resistance wire material is metallic chromium, and the high resistivity metal wire is conducive to rapid ignition reaction; after the vacuum aluminothermic reaction is completed, vacuum insulation is performed for 3 to 5 hours.

[0025] The aluminum-molybdenum-silicon alloy produced by the method of the present invention has a molybdenum content of 35-45 wt%, a silicon content of 4-10 wt%, and aluminum as the balance, with iron ≤0.05 wt%, carbon ≤0.02 wt%, oxygen ≤0.01 wt%, and nitrogen ≤0.005 wt%.

[0026] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides an aluminum-molybdenum-silicon alloy and a production method thereof, which have the following excellent effects:

[0027] The present invention uses a low-modulus water glass solution containing sodium molybdate, a by-product of the molybdenum industry, as a raw material to prepare a MoO3 / SiO2 composite, and prepares an aluminum-molybdenum-silicon ternary alloy with high uniformity and low impurity content through a vacuum aluminothermic method. While achieving comprehensive resource utilization, it solves the problems of severe segregation and excessively high oxygen and nitrogen content in the production of aluminum-molybdenum-silicon alloys by traditional aluminothermic reactions, providing a new idea for the production of aluminum-molybdenum-silicon ternary master alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 (a) SEM image and (b) TEM image of the MoO3 / SiO2 composite prepared in Example 1.

[0030] Figure 2 This is a multi-point sampling diagram of aluminum-molybdenum-silicon alloy.

[0031] Figure 3 (a) SEM image and (b) metallographic image of the aluminum-molybdenum-silicon alloy produced in Example 1.

[0032] Figure 4 (a) SEM image and (b) TEM image of the MoO3 / SiO2 composite prepared in Example 2.

[0033] Figure 5 (a) SEM image and (b) metallographic image of the aluminum-molybdenum-silicon alloy produced in Example 2.

[0034] Figure 6 This is the metallographic spectrum of the aluminum-molybdenum-silicon alloy prepared by the aluminothermic method in comparative example 1.

[0035] Figure 7 This is the metallographic spectrum of the aluminum-molybdenum-silicon alloy prepared by medium-frequency vacuum induction melting method in comparative example 2.

[0036] Figure 8 (a) SEM image and (b) TEM image of the MoO3 / SiO2 composite prepared in Example 3.

[0037] Figure 9 (a) SEM image and (b) metallographic image of the aluminum-molybdenum-silicon alloy produced in Example 3. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] The term "embodiment" is used herein specifically to describe any embodiment as "exemplary," and should not be construed as superior or preferable to other embodiments. Performance indicators in the embodiments of this application were tested using conventional testing methods in the art, unless otherwise specified. It should be understood that the terms used in this application are intended solely to describe specific implementations and are not intended to limit the disclosure herein.

[0040] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.

[0041] In order to better illustrate the content of this application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that this application can be implemented without certain specific details. In the examples, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of this application.

[0042] Under the premise of no conflict, the technical features disclosed in the embodiments of this application can be combined arbitrarily, and the resulting technical solutions belong to the contents disclosed in the embodiments of this application.

[0043] For a better understanding of the present invention, the present invention is further specifically described below through the following examples, but it should not be understood as limiting the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above invention content are also considered to fall within the scope of protection of the present invention.

[0044] Example 1

[0045] A method for producing high-quality aluminum-molybdenum-silicon alloy comprises the following steps:

[0046] To 100 kg of by-product water glass solution (sodium silicate content 35 wt%, water glass modulus 0.7, sodium molybdate content 20 wt%), 50 kg of molybdenum trioxide was added, stirring was started, and stirring was carried out at 40 rpm / min for 40 min. 46.7 kg of 55 wt% ammonium sulfate solution was added to the suspension and mixed evenly. The pH of the mixed solution was adjusted to 1.5 with hydrochloric acid. The mixed solution was transferred to a high-pressure reactor and the high-pressure reaction was carried out at 210 ° C for 24 h. After the reaction was completed, the mixed solution was filtered under reduced pressure and washed with high-purity water until the pH of the effluent reached 6.85. The filter cake was transferred to a forced air drying oven and dried at 75 ° C for 12 h. The filter cake was further kept at 500 ° C in a muffle furnace for 10 h to obtain 77.9 kg of MoO3 / SiO2 composite. The SEM and TEM spectra of the MoO3 / SiO2 composite are shown as follows: Figure 1 .

[0047] observe Figure 1 The SEM image (a) shows that silicon oxide in the MoO3 / SiO2 composite covers the molybdenum trioxide microrods, and there is a certain agglomeration phenomenon under the microscopic state. Figure 1 The TEM spectrum (b) shows that silicon oxide fully covers the surface of molybdenum trioxide. Compared with the conventional state, this MoO3 / SiO2 composite state greatly improves the uniformity and stability of mixing molybdenum trioxide and silicon oxide in the mixer, thereby ensuring the uniformity of the alloy ingot.

[0048] 77.9 kg of MoO3 / SiO2 composite and 83.3 kg of aluminum powder (iron: 0.011 wt%) were thoroughly mixed and loaded into a crucible of a vacuum thermite furnace. The furnace was closed and the Roots pump was turned on. The furnace was evacuated to a pressure of 250 Pa. A chromium wire was used as a heating source to ignite the materials to cause a vacuum thermite reaction. After the reaction was completed, the temperature was lowered for 4 h, the furnace was opened, and the slag was removed to obtain 99.2 kg of aluminum-molybdenum-silicon alloy ingots.

[0049] Example 2

[0050] A method for producing high-quality aluminum-molybdenum-silicon alloy comprises the following steps:

[0051] Only the modulus of the by-product water glass solution in Example 1 was set to 0.85, 50 kg of molybdenum trioxide was added, and 79.5 kg of MoO3 / SiO2 composite was obtained. The ingredients of the vacuum thermite reaction were changed to: 77.5 kg of MoO3 / SiO2 composite and 83.4 kg of aluminum powder. The reaction was completed to obtain 99.3 kg of aluminum-molybdenum-silicon alloy ingot.

[0052] MoO3 / SiO2 composite SEM and TEM images Figure 4 ,It was observed that silicon oxide coated the molybdenum trioxide microrods uniformly.

[0053] Example 3

[0054] A method for producing high-quality aluminum-molybdenum-silicon alloy comprises the following steps:

[0055] Only the modulus of the by-product water glass solution in Example 1 was changed to 1, 42 kg of molybdenum trioxide was added, and 72.9 kg of MoO3 / SiO2 composite was obtained. The ingredients of the vacuum thermite reaction were changed to: 72.9 kg of MoO3 / SiO2 composite and 86 kg of aluminum powder. The reaction was completed to obtain 98.6 kg of aluminum-molybdenum-silicon alloy ingot.

[0056] MoO3 / SiO2 composite SEM and TEM images Figure 8 , it was observed that silicon oxide evenly coated the molybdenum trioxide microrods.

[0057] In order to further demonstrate the beneficial effects of the present invention and to better understand the present invention, the following comparative examples are provided to further illustrate the technical features disclosed in the present invention, but they should not be construed as limiting the present invention. Other improvements made by those skilled in the art based on the above invention without inventive work are also considered to fall within the scope of protection of the present invention.

[0058] Comparative Example 1

[0059] 83.25 kg of aluminum powder, 63.9 kg of molybdenum trioxide, 69 kg of aluminum powder, and 14.1 kg of potassium chlorate were mixed evenly in proportion, placed in a molten pool made of corundum, ignited with a magnesium rod, and after cooling, 96.4 kg of aluminum-molybdenum-silicon alloy ingots were obtained.

[0060] Comparative Example 2

[0061] The aluminothermic alloy in Example 1 was melted in a medium frequency vacuum induction furnace under the following conditions: vacuum degree before melting was 0.58 Pa, argon protection vacuum degree during melting was 80 Pa, melting temperature was 1480°C, refining temperature was 1550°C, and refining time was 10 min.

[0062] The aluminum-molybdenum-silicon alloy ingots prepared in the above examples and comparative examples were Figure 2 The experimental results of multi-point sampling are as follows:

[0063] Table 1 Analysis of sampling results of aluminum-molybdenum-silicon alloy produced in Example 1

[0064] Test number Mowt% Siwt% Al Fewt% Cwt% 0wt% Nwt% 1 42.66 6.60 margin 0.021 0.018 0.006 0.005 2 42.15 6.35 margin 0.023 0.016 0.009 0.004 3 42.27 6.65 margin 0.021 0.014 0.009 0.004 4 42.75 6.45 margin 0.019 0.013 0.01 0.005 5 42.70 6.66 margin 0.022 0.014 0.006 0.003 6 42.53 6.31 margin 0.024 0.015 0.008 0.004 7 42.18 6.51 margin 0.021 0.016 0.008 0.005 8 42.30 6.40 margin 0.023 0.017 0.01 0.004 9 42.19 6.75 margin 0.017 0.016 0.008 0.004 Maximum 42.75 6.75 / 0.024 0.018 0.01 0.005 Minimum 42.15 6.31 / 0.017 0.013 0.006 0.003 Standard deviation 0.230 0.145 / 0.002 0.001 0.001 0.001

[0065] Observation of the table above shows that the segregation of Mo and Si elements in the aluminum-molybdenum-silicon alloy is less than 0.5 wt%, and the impurity elements oxygen and nitrogen are much lower than those in conventional aluminum-molybdenum-silicon alloys (such as comparative examples 1 and 2). The alloy has high purity and good uniformity. Figure 3 (a), metallographic diagram as shown Figure 3 (b) Observation revealed no obvious aluminum oxide inclusions within the alloy, indicating high alloy purity.

[0066] Table 2 Analysis of sampling results of aluminum-molybdenum-silicon alloy produced in Example 2

[0067] Test number Mowt% Siwt% Al Fewt% Cwt% 0wt% Nwt% 1 42.14 7.38 margin 0.023 0.017 0.006 0.004 2 42.13 7.32 margin 0.020 0.017 0.008 0.003 3 42.49 7.20 margin 0.028 0.015 0.007 0.004 4 42.64 7.48 margin 0.028 0.016 0.009 0.003 5 42.54 7.33 margin 0.022 0.016 0.006 0.003 6 42.71 7.38 margin 0.026 0.017 0.008 0.003 7 42.37 7.23 margin 0.028 0.016 0.004 0.005 8 42.76 7.62 margin 0.022 0.017 0.01 0.005 9 42.32 7.24 margin 0.021 0.016 0.007 0.004 Maximum 42.76 7.62 / 0.028 0.017 0.01 0.005 Minimum 42.13 7.2 / 0.02 0.015 0.004 0.003 Standard deviation 0.219 0.126 / 0.003 0.001 0.002 0.001

[0068] Observation of the above table shows that the uniformity of Mo and Si elements in the aluminum-molybdenum-silicon alloy is high, and the impurity elements oxygen and nitrogen are much lower than those in conventional aluminum-molybdenum-silicon alloys (such as comparative examples 1 and 2). The SEM and metallographic images of the aluminum-molybdenum-silicon alloy are as follows: Figure 5 , it was found that there was no obvious alumina inclusion inside the alloy, the alloy was of high purity and higher quality than similar products.

[0069] Table 3 Analysis of sampling results of aluminum-molybdenum-silicon alloy produced in Example 3

[0070] Test number Mowt% Siwt% Al Fewt% Cwt% 0wt% Nwt% 1 37.30 8.00 margin 0.026 0.015 0.006 0.003 2 37.00 7.72 margin 0.020 0.017 0.008 0.004 3 37.67 8.35 margin 0.025 0.016 0.007 0.004 4 36.95 8.17 margin 0.024 0.014 0.007 0.004 5 37.32 7.92 margin 0.025 0.013 0.010 0.005 6 37.30 8.37 margin 0.028 0.016 0.008 0.005 7 37.55 7.89 margin 0.028 0.016 0.010 0.004 8 37.44 8.27 margin 0.021 0.014 0.007 0.004 9 37.22 7.99 margin 0.023 0.014 0.009 0.003 Maximum 37.67 8.37 / 0.028 0.017 0.01 0.005 Minimum 36.95 7.72 / 0.02 0.013 0.006 0.003 Standard deviation 0.221 0.213 / 0.003 0.001 0.001 0.001

[0071] Observation of the table above shows that the uniformity of Mo and Si elements in aluminum-molybdenum-silicon alloy is high. The SEM and metallographic images of aluminum-molybdenum-silicon alloy are as follows: Figure 9 , it was found that there was no obvious alumina inclusion inside the alloy, and the alloy quality was higher than similar products.

[0072] Table 4 Analysis of sampling results of aluminum-molybdenum-silicon alloy produced in Comparative Example 1

[0073] Test number Mowt% Siwt% Al Fewt% Cwt% 0wt% Nwt% 1 41.63 6.47 margin 0.092 0.065 0.056 0.017 2 42.55 6.78 margin 0.085 0.045 0.082 0.018 3 42.08 6.81 margin 0.090 0.046 0.058 0.010 4 42.45 6.16 margin 0.108 0.050 0.083 0.013 5 41.50 6.10 margin 0.080 0.070 0.077 0.017 6 41.63 6.22 margin 0.069 0.042 0.054 0.012 7 41.12 6.15 margin 0.110 0.060 0.040 0.025 8 43.14 7.10 margin 0.081 0.063 0.080 0.017 9 41.86 6.12 margin 0.063 0.044 0.072 0.016 Maximum 43.14 7.1 / 0.11 0.07 0.083 0.025 Minimum 41.12 6.1 / 0.063 0.042 0.04 0.01 Standard deviation 0.590 0.352 / 0.015 0.010 0.014 0.004

[0074] Observation of the table above shows that the segregation of main elements in the aluminum-molybdenum-silicon alloy produced by aluminothermic reaction increases significantly. Affected by the crucible and reaction environment, the iron, carbon, oxygen and nitrogen elements increase significantly. Figure 6 , a large number of alumina inclusions and agglomerations appear in the metallographic map, and the alloy quality is poor.

[0075] Table 5 Analysis of sampling results of aluminum-molybdenum-silicon alloy produced in Comparative Example 2

[0076] Test number Mowt% Siwt% Al Fewt% Cwt% 0wt% Nwt% 1 42.03 6.59 margin 0.100 0.033 0.020 0.023 2 42.41 7.11 margin 0.116 0.031 0.021 0.024 3 42.53 6.57 margin 0.072 0.026 0.022 0.024 4 43.90 5.97 margin 0.065 0.027 0.022 0.021 5 43.83 6.09 margin 0.078 0.026 0.016 0.020 6 43.47 6.75 margin 0.078 0.031 0.015 0.024 7 43.10 7.05 margin 0.068 0.045 0.020 0.023 8 43.51 6.51 margin 0.063 0.046 0.015 0.023 9 42.54 6.62 margin 0.065 0.032 0.016 0.024 Maximum 43.9 7.11 / 0.116 0.046 0.022 0.024 Minimum 42.03 5.97 / 0.063 0.026 0.015 0.02 Standard deviation 0.641 0.357 / 0.017 0.007 0.003 0.001

[0077] Observation of the table above shows that the segregation of molybdenum in aluminum-molybdenum-silicon alloy increases, the carbon and oxygen content decreases, and the alloy uniformity is poor. Figure 7 , it was observed that there was no alumina inclusion agglomeration phenomenon in the metallographic map, but there was a small amount of alumina inclusion. Although the purity of the alloy was relatively high, the purity was lower than that of the present invention.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing an aluminum-molybdenum-silicon alloy, characterized in that: The method comprises the following steps: (1) Molybdenum trioxide and by-product water glass solution were mixed in proportion and stirred evenly; then ammonium sulfate solution was slowly added to adjust the pH and react at high temperature; the pH was adjusted to 1.2-1.8; the reaction temperature was 200-230 °C and the reaction time was 20-36 h; (2) The reaction solution is filtered under reduced pressure, washed, dried, and sintered to obtain a MoO3 / SiO2 composite; (3) mixing the MoO3 / SiO2 composite and aluminum powder in proportion, and performing a vacuum thermite reaction to obtain an aluminum-molybdenum-silicon alloy; The specific operations of step (2) are as follows: After the reaction is completed, the filter cake is obtained by vacuum filtration, and washed with high-purity water until the pH of the washing liquid is greater than 6.

8. The filter cake is dried at 70-80 ° C for 10-24 h, and then transferred to a muffle furnace at 400-550 ° C for 8-12 h to obtain a MoO3 / SiO2 composite.

2. The method for producing aluminum-molybdenum-silicon alloy according to claim 1, wherein: The sodium silicate content in the by-product water glass solution is 32-42 wt%, the water glass modulus is 0.4-1.5, and the sodium molybdate content in the water glass solution is 20 wt%.

3. The method for producing an aluminum-molybdenum-silicon alloy according to claim 1 or 2, wherein: The mass ratio of molybdenum trioxide to water glass solution is (3.8~5.4):10, the content of ammonium sulfate in the ammonium sulfate solution is 50~65 wt%, and the mass ratio of the ammonium sulfate solution to the by-product water glass solution is (3.9~5.2):

10.

4. The method for producing aluminum-molybdenum-silicon alloy according to claim 1, wherein: The iron content in the aluminum powder is less than 0.02 wt%, and the mass ratio of the MoO3 / SiO2 composite to the aluminum powder is (0.72~1.07):

1.

5. The method for producing aluminum-molybdenum-silicon alloy according to claim 1 or 4, characterized in that: The crucible in the vacuum thermite furnace is made of red copper. Close the furnace and start the mechanical pump to evacuate the furnace to a vacuum degree of <300 Pa. After the vacuum thermite reaction is completed, keep the temperature in a vacuum for 3 to 5 hours.

6. An aluminum-molybdenum-silicon alloy produced by the method of claim 1, characterized in that The aluminum-molybdenum-silicon alloy has the following contents: molybdenum: 35-45 wt%, silicon: 4-10 wt%, aluminum balance, iron ≤0.05 wt%, carbon ≤0.02 wt%, oxygen ≤0.01 wt%, and nitrogen ≤0.005 wt%.

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