Preparation method for preparing aluminum alloy slurry through photocuring

Abstract

The invention discloses a preparation method for preparing aluminum alloy slurry by photocuring, which comprises the following specific steps: 1, weighing 2-5 mu m aluminum alloy powder, carrying out high-energy ball milling for 10-20 hours, and then filtering by using a 200-800-mesh screen; 2, epoxy acrylate, a diluent, an initiator and a defoaming agent are subjected to vacuum stirring for 10-30 min, and a premixed solution is obtained; 3, the filtered aluminum alloy powder and the premixed liquid are subjected to vacuum stirring, and aluminum alloy slurry obtained after light curing is obtained; and 4, respectively curing the aluminum alloy slurry by using a DLP (Digital Light Processing) light curing machine until the process is finished.

Description

Technical Field

[0001] The invention relates to the technical field of photocuring additive manufacturing and prepares aluminum alloy slurry with good curing performance. Background Art

[0002] The concept of aluminum alloy (high entropy alloys, HEAs) is an alloy containing 5 or more main elements and the content of each element is between 5% and 35%. Therefore, HEAs are also called multi-principalelement alloys (MPEAs) and complex concentrated alloys (CCAs). Among them, HEAs composed of refractory metal elements such as Nb, Mo, Hf, Ta, and W are called refractory HEAs (refractory high entropy alloys, RHEAs). In 2010, Senkov et al. prepared MoNbTaW and MoNbTaWV RHEAs by arc melting technology. Both RHEAs have a body-centered cubic (bcc) single-phase structure, still have a stable structure at 400°C, and can maintain good compressive yield strength at 1600°C, which is much better than traditional nickel-based high-temperature alloys. Since then, RHEAs have attracted great attention from researchers due to their excellent high-temperature structural stability and high-temperature mechanical properties, and have developed rapidly, making them a promising alternative to nickel-based high-temperature alloys in aerospace, nuclear reactors, petrochemicals and other fields that require high-temperature service.

[0003] At present, HEAs are mainly prepared by vacuum arc melting (VAM) and powder metallurgy (PM). Among them, arc melting technology is the most commonly used method for preparing RHEAs due to its high melting temperature. However, the cooling rate of this process is low, and the prepared alloy is prone to problems such as coarse structure and severe component segregation. Although powder metallurgy technology can obtain alloy structures with uniform elements and fine structures, this process consolidates the powder by high-temperature sintering, which inevitably leads to porosity problems. At the same time, the mechanical alloying process of the powder will also introduce more impurities into the alloy. The traditional process has many problems in the preparation of RHEAs, such as complex manufacturing process, long cycle, low material utilization rate, and high cost, which greatly limits the practical application of RHEAs. Therefore, it is urgent to seek more advanced manufacturing technology.

[0004] It should be pointed out that the use of photopolymerization to form aluminum alloy materials effectively alleviates the deformation heterogeneity of the heterogeneous zone, which helps to improve the global yield strength of the heterogeneous structural material and maintain ductility. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above prior art: to provide an aluminum alloy slurry with good curing performance. The applicant has found that by adjusting the color, particle size, particle size distribution, etc. of the aluminum alloy, the powder's absorption, refraction and scattering of ultraviolet light can also be affected. The present invention realizes a method for preparing an aluminum alloy slurry with good curing performance by reasonable grading and matching the color and particle size distribution of the powder.

[0006] The technical solution of the present invention is as follows: A method for preparing aluminum alloy slurry by light curing, comprising the following specific steps:

[0007] 1) Weighing a surface modifier and aluminum alloy particles of different colors and different particle sizes, mixing and stirring for 1-50 hours, and then drying to obtain modified aluminum alloy particles;

[0008] 2) Mixing the modified aluminum alloy particles with a diluent and performing vacuum stirring to remove bubbles for 10-30 minutes to obtain a premixed solution, wherein the premixed solution comprises, by weight: 100 parts of the diluent and 1-30 parts of the modified aluminum alloy particles;

[0009] 3) Adding 1-10 wt.% of initiator into the premixed liquid and performing vacuum stirring to remove bubbles for 20-30 min to obtain a method for preparing a light-cured aluminum alloy slurry material.

[0010] As an optimization, the surface modifier is one or more of KH550, KH560, and KH570.

[0011] As an optimization, in step 1), by weight: 10-15 parts of surface modifier, 30-40 parts of aluminum alloy particle mixture with a particle size range of 2-5 μm.

[0012] As the most preferred, in step 1), by weight: 10-15 parts of surface modifier;

[0013] 5-6 parts of aluminum alloy particles with a particle size of 2-5 μm produced and sold by Aladdin;

[0014] Preferably, the diluent is one or more of HEA, HDDA, and TMPTA. Preferably, the initiator is one or more of TPO, 819, and 184.

[0015] The aluminum alloy slurry prepared by the present invention is solidified and formed on a 405nm optical machine to obtain an alloy blank; the solidified blank is degreased; and the degreased alloy blank is placed in a gas pressure sintering furnace at a sintering temperature of 1200-2200°C. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with specific examples, but the present invention is not limited to the following specific examples.

[0017] Implementation Cases

[0018] Aluminum alloy slurry with good curing performance is prepared according to the following method, and the specific steps are as follows:

[0019] 1) Weigh the surface modifier KH550 and aluminum alloy particles of different colors and different particle sizes, mix and stir for 20 minutes, and then dry to obtain modified aluminum alloy particles; by weight: 15 parts of surface modifier;

[0020] Aladdin produces and sells 5-6 portions of aluminum alloy particles with a particle size of 2-5 μm.

[0021] 2) Mixing the modified aluminum alloy particles with the diluent and performing vacuum stirring to remove bubbles for 30 minutes to obtain a premixed solution, wherein, by weight, the diluent HDDA is 100 parts and the modified aluminum alloy is 30 parts;

[0022] 3) Add 10 wt.% of initiator TPO to the premixed liquid and perform vacuum stirring to remove bubbles. Stirring time is 30 min to obtain aluminum alloy slurry with good curing properties.

[0023] The aluminum alloy slurry prepared in this embodiment is cured on a 405nm light machine, and the aluminum alloy is cured by a DLP light curing machine until the end. The cured green body is degreased; then the degreased green body is placed in a gas pressure sintering furnace at a sintering temperature of 1200-2200°C.

[0024] The above are only examples of the features of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent exchange or equivalent replacement falls within the protection scope of the present invention.

Claims

1. A method for preparing an aluminum alloy gradient material by photocuring, characterized in that: The specific steps include: 1.1 Weigh the surface modifier and aluminum alloy particles of different colors and sizes, mix and stir for 10-20 minutes, and then dry to obtain the modified aluminum alloy powder; 1.2 Mix the modified aluminum alloy powder and diluent and stir under vacuum to remove bubbles for 10-30 minutes to obtain a premixed solution, wherein the premixed solution comprises, by weight: 100 parts of diluent, 1-30 parts of modified copper and aluminum alloy powder; 1.3 Add 1-10wt.% of initiator to the premixed liquid and stir in vacuum to remove bubbles. Stirring time is 20-30 minutes to obtain aluminum alloy slurry with good curing performance.

2. The method for preparing a light-cured aluminum alloy material with good curing performance according to claim 1, characterized in that: The surface modifier is one or more of KH550, KH560 and KH570.

3. The method for preparing aluminum alloy material by photocuring according to claim 1, characterized in that: In step 1), by weight: 10-15 parts of a surface modifier and 30-40 parts of an aluminum alloy mixture having a particle size range of 2-5 μm.

4. The method for preparing aluminum alloy gradient material by photocuring according to claim 3, characterized in that: 10-15 parts of surface modifier; 5-6 parts of aluminum alloy particles with a particle size of 2-5μm produced and sold by Aladdin.

5. The method for preparing aluminum alloy material by photocuring according to claim 1, characterized in that: The diluent is one or more of HEA, HDDA and TMPTA.

6. The method for preparing aluminum alloy material by photocuring according to claim 1, characterized in that: The initiator is one or more of TPO, 819, and 184. The aluminum alloy slurry prepared by the present invention is solidified and formed on a 405nm optical machine to obtain an alloy blank; the solidified blank is degreased; and the degreased aluminum alloy blank is placed in a gas pressure sintering furnace at a sintering temperature of 1200-2200°C.