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CN-121491353-B - Grain refinement and ignition performance collaborative optimization preparation method of rare earth ignition alloy

CN121491353BCN 121491353 BCN121491353 BCN 121491353BCN-121491353-B

Abstract

The invention relates to a preparation method for grain refinement and ignition performance collaborative optimization of a rare earth ignition alloy, which belongs to the technical field of rare earth ignition alloy manufacturing, and the preparation raw materials of the blank comprise, by percentage, 35-45% of lanthanum, 15-30% of cerium, 5-15% of tin, 5-10% of zinc, 5-10% of praseodymium, 1-5% of neodymium and 15-25% of iron. The nanometer active metal additive and the blank cooperate to make the RE igniting alloy produce continuous spark under slight friction or impact and raise the igniting performance of the RE igniting alloy.

Inventors

  • DING JICHENG
  • E Shengze
  • WANG HAIQING
  • SUN XIANG

Assignees

  • 包头市晶鑫稀土新材料有限公司

Dates

Publication Date
20260508
Application Date
20260113

Claims (7)

  1. 1. The preparation method of the rare earth ignition alloy is characterized by comprising the following steps of: (1) The molten liquid treatment, namely placing the blank into a high-temperature heat treatment furnace, and heating to 850-1050 ℃ and preserving heat for 5-6 hours to obtain molten metal; (2) Pouring molten metal into a tundish preheated to 900 ℃, controlling the molten metal to flow out in a stable and continuous liquid flow form at a speed of 1-5m/s by a discharge spout at the bottom of the tundish, and spraying an atomization medium to interact with the molten metal by a preset atomization nozzle at a speed of 300-600m/s below the discharge spout to cut the molten metal into atomization liquid drops; (3) The preparation process of the active metal additive comprises the steps of mixing magnesium powder, iron powder, titanium powder and aluminum powder to obtain the active metal additive, wherein the iron powder is prepared by reducing iron and steel phosphorus by adopting hydrogen to obtain sponge iron, crushing and screening to obtain iron powder; (4) Adding active metal for synergistic optimization, namely adding active metal additives and solid powder particles into a stirrer at the same time for 25r/min to stir for 5-10min, and then applying ultrasonic vibration with the frequency of 20-40kHz for 10-15min to obtain a prefabricated material; (5) And (3) spark plasma sintering, namely placing the prefabricated material into a sintering cavity, performing spark plasma sintering in a nitrogen environment, and cooling to obtain the rare earth ignition alloy.
  2. 2. The method for preparing rare earth ignition alloy according to claim 1, wherein the raw materials for preparing the blank comprise, by percentage, 35-45% lanthanum, 15-30% cerium, 5-15% tin, 5-10% zinc, 5-10% praseodymium, 1-5% neodymium and 15-25% iron.
  3. 3. The preparation method of the rare earth ignition alloy with the coordinated optimization of grain refinement and ignition performance is characterized by comprising the steps of weighing raw materials of all components according to mass percentages, putting the raw materials into a smelting furnace together, smelting at a high temperature under the condition of isolating oxygen, after the raw materials of all components are melted, uniformly mixing by electromagnetic stirring, discharging, and cooling and casting ingots under the condition of isolating oxygen to obtain the blank.
  4. 4. The method for preparing rare earth sparking alloy according to claim 1, wherein the atomizing medium in the step (2) is nitrogen.
  5. 5. The method for preparing the rare earth ignition alloy by grain refinement and ignition performance collaborative optimization according to claim 1, which is characterized in that the mass ratio of magnesium powder, iron powder, titanium powder and aluminum powder is 1:0.5:0.3:0.8.
  6. 6. The method for preparing rare earth ignition alloy according to claim 5, wherein the mass ratio of the active metal additive to the solid powder particles is 0.2:1.
  7. 7. The method for preparing the rare earth ignition alloy by grain refinement and ignition performance collaborative optimization according to claim 1, wherein the temperature is raised at a rate of 7 ℃ per minute in the step (1), the spark plasma sintering is raised to 600 ℃ to 700 ℃ at a rate of 200 ℃ per minute under a pressure of 50MPa to 60MPa in the step (4), the temperature is kept for 3min to 6min, and the temperature is lowered at a rate of 8 ℃ per minute in the step (4).

Description

Grain refinement and ignition performance collaborative optimization preparation method of rare earth ignition alloy Technical Field The invention belongs to the technical field of rare earth sparking alloy manufacturing, and particularly relates to a preparation method for grain refinement and ignition performance collaborative optimization of rare earth sparking alloy. Background The igniting alloy, also called igniting alloy or flint alloy, is an alloy which is pyrophoric after being contacted with air in powder form, and mainly comprises rare earth alloy, zirconium alloy, metal powder of iron, cobalt, nickel, vanadium, titanium, manganese and the like, and the metal powder is called igniting metal, and is divided into a non-rare earth system and a rare earth system. The grains of the traditional rare earth ignition alloy are rough, inclusions, pores or uneven grain sizes are easily formed in the rare earth ignition alloy, the fluctuation range of hardness and tensile strength is large, partial products are easily broken under repeated impact or friction, slag is easily generated, and continuous ignition cannot be realized. Disclosure of Invention The invention aims to provide a preparation method for the grain refinement and ignition performance collaborative optimization of rare earth ignition alloy for solving the problems. The invention realizes the above purpose through the following technical scheme: The invention provides a preparation method for grain refinement and ignition performance collaborative optimization of a rare earth ignition alloy, which comprises the following steps: (1) The molten liquid treatment, namely placing the blank into a high-temperature heat treatment furnace, and heating to 850-1050 ℃ and preserving heat for 5-6 hours to obtain molten metal; (2) Pouring molten metal into a tundish preheated to 900 ℃, controlling the molten metal to flow out in a stable and continuous liquid flow form at a speed of 1-5m/s by a discharge spout at the bottom of the tundish, spraying an atomization medium at a speed of 300-600m/s by a preset atomization nozzle below the discharge spout to interact with the molten metal, shearing the molten metal into atomization liquid drops, injecting the atomization liquid drops into a condensing tower, and flying, settling, cooling and solidifying the atomization liquid drops in the condensing tower to obtain solid powder particles; (3) Adding active metal for synergistic optimization, namely adding active metal additives and solid powder particles into a stirrer at the same time for 25r/min to stir for 5-10min, and then applying ultrasonic vibration with the frequency of 20-40kHz for 10-15min to obtain a prefabricated material; (4) And (3) spark plasma sintering, namely placing the prefabricated material into a sintering cavity, performing spark plasma sintering in a nitrogen environment, and cooling to obtain the rare earth ignition alloy. As a further optimization scheme of the invention, the raw materials for preparing the blank comprise, by percentage, 35-45% of lanthanum, 15-30% of cerium, 5-15% of tin, 5-10% of zinc, 5-10% of praseodymium, 1-5% of neodymium and 15-25% of iron. The preparation process of the blank comprises the steps of weighing raw materials of all components according to mass percentage, putting the raw materials into a smelting furnace together, smelting at high temperature in a state of isolating oxygen, after the raw materials of all components are melted, uniformly mixing by adopting electromagnetic stirring, discharging, and cooling and casting ingot in a state of isolating oxygen to obtain the blank. As a further optimization scheme of the invention, the atomizing medium in the step (2) is nitrogen. The preparation process of the active metal additive comprises the steps of mixing magnesium powder, iron powder, titanium powder and aluminum powder to obtain the active metal additive, wherein the iron powder is prepared by reducing iron and steel phosphorus by adopting hydrogen to roll iron and steel phosphorus to obtain sponge iron, crushing and screening to obtain iron powder, the titanium powder is prepared by reducing titanium chloride by adopting a Clay method to obtain sponge titanium, crushing and screening to obtain titanium powder, and the particle size of the magnesium powder, the iron powder, the titanium powder and the aluminum powder is 10-15nm. As a further optimization scheme of the invention, the mass ratio of the magnesium powder to the iron powder to the titanium powder to the aluminum powder is 1:0.5:0.3:0.8. As a further refinement of the invention, the mass ratio of active metal additive to solid powder particles is 0.2:1. According to the method, the temperature is increased at the rate of 7 ℃ per minute in the step (1), the temperature is increased to 600-700 ℃ at the rate of 200 ℃ per minute under the pressure of 50-60 MPa in the step (4), the temperature is kept for 3-6 min, and the temperature is redu