Gel injection molding method for high-gravity alloy
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A technology of gel injection molding and high specific gravity, which is applied in the field of high specific gravity alloy products with high solid content and complex shape by gel injection molding with excellent performance, and can solve the difficulties in preparation, complex shapes, and development limitations of parts, etc. problems, to achieve the effect of simple process, reduced production cost and high production efficiency
Inactive Publication Date: 2010-06-16
UNIV OF SCI & TECH BEIJING
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However, due to the influence of binders and degreasing, currently only parts with relatively complex shapes and small thickness (or diameter) (10mm) can be formed.
The development of large-thickness parts or other parts with large dimensions and cross-sectional changes with more co
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Embodiment 1
[0022] Example 1: Superheavy alloy W-Ni-Cu based gel injection molding
[0023] 1. According to the superheavy alloy W-Ni-Cu formula, respectively mix -500 mesh tungsten powder, nickel powder, copper powder and molybdenum powder (W 85-98%, Ni1.35-10%, Cu 0.6-3%, Mo 0.05 ~2%) after ball milling and mixing for 6 hours, weigh 1.7 kg of mixed alloy powder for use. .
[0024] 2. Dissolve 24.7g monomeric acrylamide and 0.27g crosslinking agent N,N′-methylenebisacrylamide in 115ml deionized water, add the mixed alloy powder in step 1, and stir evenly;
[0025] 3. Measure 0.7ml of dispersant oleic acid and 0.2ml of self-made dispersant into the solution in the second step, stir evenly, and make a slurry with moderate fluidity after ball milling for 7.5 hours, and degas the slurry for 25 minutes under vacuum ;
[0026] 4. Measure 0.8ml of catalyst N,N,N',N'-tetramethylethylenediamine and 1ml of initiator ammonium persulfate, add them to the slurry in step 3, and stir evenly.
[002...
Embodiment 2
[0030] Example 2: Gel injection molding of superheavy alloy W-Ni-Fe system weight ring
[0031] 1. According to the superheavy alloy W-Ni-Fe system formula, 650 mesh tungsten powder, nickel powder and iron powder (W 85-98%, Ni1.35-10%, Fe 0.6-2.5%, Mo 0.05-2.5%) After ball milling and mixing for 10 hours, 3.4 kg of mixed alloy powder was weighed for use.
[0032] 2. Dissolve 45.4g of monomeric acrylamide and 0.55g of crosslinking agent N,N'-methylenebisacrylamide in 276ml of deionized water, add the mixed alloy powder in step 1, and stir evenly;
[0033] 3. Measure 2.9ml of dispersant oleic acid into the solution in the second step, stir evenly, and make a slurry with moderate fluidity after ball milling for 7 hours, and degas the slurry for 35 minutes under vacuum to remove residual air bubbles;
[0034] 4. Measure 2ml of catalyst N, N, N', N'-tetramethylethylenediamine and 3.2ml of initiator ammonium persulfate (to ensure sufficient injection molding time), add to the slurr...
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Abstract
The invention discloses a gel injection molding method for high-gravity alloy, which belongs to the field of powder metallurgy. The method is characterized by comprising the following steps: firstly, weighing metal powder of tungsten, nickel, iron, copper, molybdenum, and the like used as raw materials with the average particle size of 1 to 100 micros according to a proportion, and ball-milling the metal powder for 1 to 20 hours to mix the metal powder evenly; then, mixing a monomer and a cross linker in a mass ratio of (1-250): 1, and dissolving the mixture into deionized water to obtain 10 to 55 percent solution; adding the evenly-mixed alloy powder and dispersant accounting for 0.01 to 5 percent of the volume of the alloy powder into the solution, ball-milling the mixture for 2 to 10 hours to form slurry with good fluidity, and exhausting the air for 5 to 60 minutes; and adding 0.02 to 2 percent of catalyst and initiator accounting for 0.02 to 5 percent of the mass of the monomer into the slurry, stirring the mixture evenly and slowing injecting the mixture into a die after exhausting, solidifying the mixture for 20 to 180 minutes at the temperature of between 20 and 70 DEG C, then releasing the solidified mixture from the die, drying the mixture for 30 to 120 hours in vacuum, and then sintering the mixture for 0.5 to 3 hours at the temperature of between 1,100 and 1,550 DEG C to obtain high-gravity alloy workpieces. The molded alloy workpieces have consistent performance, small weight dispersion degree, high size precision and high yield. The method does not need complex equipment and special degreasing process, and has simple process and low production cost.
Description
technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and in particular provides a method for preparing high specific gravity alloy products with high solid phase content, excellent performance and complex shape by gel injection molding. Background technique [0002] High specific gravity alloys refer to the addition of nickel, iron, copper or other alloying elements to tungsten as a matrix, with a specific gravity of 17.0-18.5g / cm 3 between. Due to its advantages of high density, high strength and hardness, strong ability to absorb X-rays or γ-rays, high corrosion and oxidation resistance, good electrical conductivity, and low thermal expansion coefficient, it is often used as shielding materials, contact materials and armor-piercing projectile materials. Used in aerospace, energy, military, machinery and metallurgy and other fields. [0003] At present, there are two series of high specific gravity tungsten alloys, W-Ni-Cu ...
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