Method for increasing density of tungsten-nickel-iron alloy through high-energy ball milling
A tungsten-nickel-iron alloy and high-energy ball milling technology, which is applied in the field of high-energy ball milling to increase the density of tungsten-nickel-iron alloy, can solve the problem of few reports on the mechanical properties of ball milling powder
Inactive Publication Date: 2016-04-06
何小红
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Problems solved by technology
At present, there are many related reports on the superfine powder of high specific gravity alloys, but there are few reports on the mechanical properties of ball milled powders.
Method used
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Embodiment
[0013] The test uses high-purity tungsten powder, carbonyl iron powder, and electrolytic nickel powder. The main physical and chemical properties of the powder are shown in Table 1.
[0014]
[0015] After mechanically mixing W, Ni, and Fe powders according to the ratio of 93:41:9:2:1 (mass fraction), divide them into two parts, one part is numbered No. 1, and the other part is numbered No. 2. The No. 2 powder was ball-milled in a high-energy ball mill with cemented carbide balls, the ball-to-material ratio was 5B1, and the ball-milling time was 10 h. Ar was used as the protective atmosphere. The two mixed powders were pressed by an isostatic press, and latex was used as the material, and the forming pressure was 200MPa. The sample was sintered under the H2 protective atmosphere. During the sintering process, the temperature was raised according to the uniform system and the same sintering temperature and holding time.
[0016] The two kinds of powder compacted samples wer...
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Abstract
The invention discloses a method for increasing the density of tungsten-nickel-iron alloy through high-energy ball milling. According to the method, tungsten-nickel-iron alloy powder is subjected to ball milling in a high-energy ball milling machine; tungsten carbide balls are adopted, the ball-to-powder ratio is 5:1, and the ball milling time is 10 h; the powder subjected to ball milling is pressed through an isostatic pressing machine, the powder is packaged through latex in a sleeved mode, the forming pressure is 200 MPa, and then the powder is sintered in an H2 protective gas atmosphere. Tests prove that the density of a sample formed by pressing the tungsten-nickel-iron alloy powder subjected to ball milling can reach more than 98%, that is, the density of the sample sintered at the solid-state stage can reach the requirements; meanwhile, the tungsten-nickel-iron alloy powder subjected to ball milling can also be subjected to solid-state sintering at 1400 DEG C, the sintering temperature is decreased obviously, and energy is saved; moreover, the tungsten-nickel-iron alloy subjected to solid-state sintering does not deform and can be manufactured into complex-shaped products.
Description
technical field [0001] The invention relates to a method for increasing the density of tungsten-nickel-iron alloy by high-energy ball milling, and belongs to the technical field of performance optimization of tungsten-nickel-iron alloy. Background technique [0002] High-density tungsten alloys are generally densified by liquid phase sintering, but particle growth and segregation are prone to occur in the liquid phase, which affects the mechanical properties of the alloy. The structure of the high specific gravity alloy is composed of body-centered cubic hard tungsten phase and face-centered cubic binder phase surrounding the tungsten phase. The former constitutes the tungsten skeleton to ensure the density and strength of the alloy, and the latter is formed by alloying elements and tungsten. The factors affecting liquid phase sintering of WNiFe alloy include temperature, particle size, time, atmosphere and many other aspects. For high-density tungsten alloys, the influence...
Claims
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IPC IPC(8): B22F1/00C22C1/04
Inventor 何小红
Owner 何小红