Short-process non-consumable arc melting preparation method of high-density high-melting-point tungsten alloy
An arc melting and arc melting furnace technology, applied in the field of short-flow non-consumable arc melting preparation, can solve problems such as long production cycle, and achieve the effects of reducing preparation cost, high processing efficiency and strong reproducibility
Active Publication Date: 2021-07-09
CENT SOUTH UNIV
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Benefits of technology
This patented technology involves three steps: 1) making an initial mixture for creating alloys through grinding or mixing metal particles together into tiny balls that are then pressed under specific pressures at very low temperatures (C). These processes allow for efficient production without consuming expensive resources such as molybdenum or tantalum. Secondly, these methods involve combining different types of metals before melting them down, resulting in improved properties like strengths and durability over time compared to traditional methodologies. Thirdly, this new technique allows for reuse of consumables made from welded components instead of disposing it afterward when needed. Overall, this technical effect makes producing highly pure nanometer-thick films more efficiently than current technological means.
Problems solved by technology
This patented describes different ways to make highly resistant weldmetals (TW) without losing their ability to form strong bonds like titanium). These techniques involve making certain parts stronger than usual ones through specific chemical compositions called tungsand gunspowders. By combining these two components together, they may achieve better results compared to traditional methods involving fusion/sponitation. Additionally, the resulting material should also maintain its own shape even when subjected to severe conditions over time. Compared to conventional methods, the new technique described in this patents allows for faster manufacturing times while improving economics and productivity.
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[0029] The invention designs and uses the non-consumable arc smelting method, and rapidly prepares high-density and high-melting tungsten alloys on the basis of optimizing the powder pressing process. Higher concentration, part of the original impurities in the sample or the trace impurities introduced and generated during the preparation process will be purified at high temperature, which has a certain purification effect. The main process flow is as follows: First, uniformly mix the alloy powder in a 3D mixer, and then use cold isostatic pressing to obtain a block-shaped green body. Under the condition of ensuring the vacuum degree (≤4Pa) in the furnace, argon gas is introduced. , using the non-consumable arc melting method to preheat, premelt, smelt and remelt the sample (4-6 times), and obtain a high-density tungsten alloy with high melting point (above 97.5%) after rapid cooling.
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The invention relates to a short-process non-consumable arc melting preparation method of a high-density and high-melting-point tungsten alloy. According to the invention, W powder with an average particle size of 3-5 micrometers and tantalum powder with an average particle size of 5 micrometers are uniformly mixed according to designed components and then are put into a cold isostatic pressing sheath, and a prefabricated block is obtained through cold isostatic pressing forming; the cold isostatic pressing process conditions comprise the steps that firstly, the cold isostatic pressing pressure is gradually increased to 250 MPa and kept, then, the cold isostatic pressing pressure is gradually reduced to 160 MPa at the speed of 18 MPa/min and kept for 2 min, and finally, the pressure is reduced to normal pressure from 160 MPa at the speed of 10 MPa/min; and finally, high-density and high-melting-point tungsten alloy or pure tungsten is obtained through non-consumable electric arc melting. The block-shaped green body with strong binding force is prepared by adopting cold isostatic pressing in one step, and a compact product with uniform components is obtained by combining a subsequent process. The preparation process is simple and controllable, the obtained product is excellent in performance, and large-scale industrial application is facilitated.
Description
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