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Large-size fine grain molybdenum rod and preparation method thereof

A large size, molybdenum rod technology, applied in the field of powder metallurgy, can solve the problems of no grain size and comprehensive mechanical properties, and achieve the effect of fine and uniform grain structure, fine grain and high pass rate

Active Publication Date: 2020-01-24
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Zhang Lingjie et al. prepared molybdenum electrodes with a diameter of 500-700 mm and a length of 2500-3000 mm (a method for preparing ultra-large fine-grained molybdenum electrodes, patent publication number CN104190937B, inventor: Zhang Lingjie, etc.), but the large-sized electrodes prepared by this method Molybdenum electrodes are mainly used in the production of glass fiber filaments, without specific grain size and comprehensive mechanical properties

Method used

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  • Large-size fine grain molybdenum rod and preparation method thereof
  • Large-size fine grain molybdenum rod and preparation method thereof
  • Large-size fine grain molybdenum rod and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] (1) Molybdenum powder selection: the selected particle size is 3.0μm, and the loose-loading ratio is 1.1g / cm 3 molybdenum powder as raw material;

[0041] (2) cold isostatic pressing forming: the molybdenum powder (pure molybdenum powder) selected in step (1) is put into the mould, and then pressurized under 150MPa pressure for 6 minutes to obtain a forming blank with a diameter of 205mm;

[0042] (3) High-temperature sintering: put the formed billet obtained in step (2) into an intermediate-frequency high-temperature hydrogen sintering furnace for sintering: heat up to 1200°C at a rate of 80°C / h, hold for 6 hours, and continue at a rate of 120°C / h Raise the temperature to 1900°C and keep it warm for 4 hours to obtain a sintered compact with a diameter of 180mm and a length of 900mm;

[0043] (4) Forging and deformation processing: the sintered billet obtained in step (3) is subjected to two times of rapid forging and deformation processing; wherein, the heating temper...

Embodiment 2

[0047] (1) Molybdenum powder selection: the selected particle size is 3.5μm, and the loose-pack ratio is 1.2g / cm 3 molybdenum powder as raw material;

[0048] (2) cold isostatic pressing forming: the molybdenum powder (pure molybdenum powder) selected in step (1) is put into the mould, and then pressurized under 180MPa pressure for 8 minutes to obtain a forming blank with a diameter of 270mm;

[0049] (3) High-temperature sintering: put the formed billet obtained in step (2) into an intermediate frequency high-temperature hydrogen sintering furnace for sintering, raise the temperature to 1200°C at a rate of 70°C / h, keep it warm for 8h, and continue at a rate of 110°C / h Raise the temperature to 1950°C and keep it warm for 5 hours to obtain a sintered compact with a diameter of 235mm and a length of 850mm;

[0050] (4) Forging deformation processing: The sintered billet obtained in step (3) is subjected to two times of rapid forging deformation processing, wherein the heating t...

Embodiment 3

[0054] (1) Selection of molybdenum powder: the selected particle size is 4μm, and the bulk ratio is 1.3g / cm 3 molybdenum powder as raw material;

[0055] (2) Cold isostatic pressing: put the molybdenum powder (pure molybdenum powder) selected in the first step into the mould, and hold the pressure for 10 minutes under a pressure of 200MPa to obtain a formed blank with a diameter of 350mm;

[0056] (3) High-temperature sintering: put the shaped blank obtained in step (2) into an intermediate frequency high-temperature hydrogen sintering furnace for sintering, raise the temperature to 1200°C at a rate of 60°C / h, keep it for 10h, and continue at a rate of 100°C / h Raise the temperature to 2000°C and keep it warm for 6 hours to obtain a sintered billet with a diameter of 305mm and a length of 750mm;

[0057] (4) Forging and deformation processing: the sintered billet obtained in step (3) is subjected to two times of rapid forging and deformation processing; wherein, the heating te...

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Abstract

The invention discloses a preparation method of a large-size fine grain molybdenum rod. The method comprises the steps of forming treatment, wherein forming treatment is carried out on molybdenum powder to obtain a formed blank; sintering treatment, wherein sintering treatment is carried out on the formed blank to obtain a sintered blank; forging deformation treatment, wherein forging deformationtreatment is carried out on the sintered blank to obtain a forging rod blank; and heat treatment, wherein annealing heat treatment is carried out on the forging rod blank to obtain a molybdenum rod. The production specifications of the pure molybdenum rod prepared with the preparation method of the large-size fine grain molybdenum rod can be enlarged, the diameter can range from 90 millimeters to150 millimeters, and the length can reach 3,000 millimeters; and according to the material, crystalline grains are fine and uniform, the room temperature tensile strength is higher than or equal to 550 MPa while the percentage elongation after fracture is larger than or equal to 15% at the room temperature, and at 1,000 DEG C, the high-temperature strength is higher than or equal to 200 MPa, and the percentage elongation after fracture is larger than or equal to 20%.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a large-size fine-grained molybdenum rod and a preparation method thereof. Background technique [0002] Pure molybdenum has a high melting point, high elastic modulus, good electrical and thermal conductivity and low thermal expansion coefficient, and has been widely used in the medical field, aerospace, power electronics and other fields. At present, the common specifications produced in China are rods with a diameter of less than 80mm. The foreign standard ASTM B387 requires molybdenum rods with a diameter greater than 80mm to have a tensile strength greater than 450MPa, a yield strength greater than 380MPa, an elongation greater than 10%, and a hardness greater than HV205. [0003] With the further acceleration of the localization process of high-end medical components, and the continuous development of aerospace and weapon industry applications, the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/04B22F3/10B22F3/17B22F3/24B22F5/00
CPCB22F3/04B22F3/1017B22F3/17B22F3/24B22F5/00B22F2003/248B22F1/05
Inventor 王承阳董帝刘国辉弓艳飞苏国平苏国军熊宁张树勇王寅常洋康聚磊
Owner 安泰天龙钨钼科技有限公司
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