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A kind of ultra-large-scale high-performance molybdenum alloy plate and its preparation method

An ultra-large size, molybdenum alloy technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor fluidity of molybdenum alloy powder, cracking structure and performance of large ingots, insufficient strength, etc., to expand the scope of application and improve mechanical properties. and the effect of recrystallization temperature

Active Publication Date: 2020-08-11
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

With the development of science and technology, more and more occasions need to use molybdenum alloy sheets with super large specifications and high performance. Due to the influence of equipment and technology accumulation, the commonly used solutions generally adopt the method of splicing, but spliced ​​sheets There are disadvantages such as high temperature variability, insufficient strength, and poor precision
[0003] For molybdenum alloy sheets with a unit weight of more than 500kg, the preparation process has the following difficulties: 1) Due to the poor fluidity of the molybdenum alloy powder, the conventional powder loading process is likely to cause problems such as the size of the compact and the warping of the sheet surface, and the large sheet The heavy slab adopts the traditional demoulding process, which is difficult to demould. If the operation is improper, it is easy to cause the compact to break; Large ingot cracking and uneven structure and properties; 3) Large-size ingots have defects such as uneven distribution of residual stress and uneven deformation during rolling and deformation, which lead to slab cracking and uneven structure and properties

Method used

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  • A kind of ultra-large-scale high-performance molybdenum alloy plate and its preparation method
  • A kind of ultra-large-scale high-performance molybdenum alloy plate and its preparation method
  • A kind of ultra-large-scale high-performance molybdenum alloy plate and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Firstly, the molybdenum powder after the air suspension classification treatment is mixed according to the weight percentage of Mo-0.50Ti-0.10Zr-0.12C-1.0Hf, wherein the Mo powder has a Fisher particle size of 3.0 μm, and the TiH 2 , ZrH 2 , HfC, Mo 2 The particle size of C powder is -300 mesh; the configured raw materials are subjected to two vibrating screening treatments, the mesh number of which is 80 mesh, and then the raw materials are mixed in a three-dimensional mixer for 4 hours, and mixed evenly for later use.

[0037] 2) Put the mixed alloy powder into the mold cavity, carry out vibration treatment when the filling amount is 1 / 2, 3 / 4 and completely filled respectively, and then seal and complete cold isostatic cooling under the condition of 150MPa and holding pressure for 15s Press and form. When demoulding, first open the side panel of the mold shell, and then erect the slab together with the rubber sleeve, take off the rubber sleeve to expose the slab,...

Embodiment 2

[0044] 1) First, mix the molybdenum powder after air suspension and classification according to the weight percentage ratio of Mo-0.45Ti-0.08Zr-0.10C-1.2Hf, wherein the Fischer particle size of Mo powder is 3.5 μm, TiH 2 , ZrH 2 , HfC, Mo 2 The particle size of C powder is -200 mesh. The prepared raw materials were vibrating and sieved three times, and the mesh size of the screen was 100 mesh. After that, the raw materials were mixed in a double-motion mixer for 5 hours, and mixed evenly for later use.

[0045] 2) Put the mixed alloy powder into the mold cavity, carry out vibration treatment when the filling amount is 1 / 2, 3 / 4 and completely filled respectively, and then seal and press to form under the condition of 200MPa and holding pressure for 10s. When demoulding, first open the side panel of the mold shell, and then erect the slab together with the rubber sleeve, take off the rubber sleeve to expose the slab, and tie the exposed part of the slab compact with a sling to...

Embodiment 3

[0052] 1) Firstly, the molybdenum powder after the air suspension classification treatment is mixed according to the weight percentage of Mo-0.40Ti-0.07Zr-0.08C-1.0Hf, wherein, the Mo powder has a Fisher particle size of 4.0 μm, and the TiH 2 , ZrH 2 , HfC, Mo 2The particle size of C powder is -400 mesh; the prepared raw materials are vibrating and sieved twice, and the mesh number of the screen is 120 mesh, and then the raw materials are mixed in a three-dimensional mixer for 6 hours, and mixed evenly for later use.

[0053] 2) Put the mixed alloy powder into the mold cavity, carry out vibration treatment when the filling amount is 1 / 2, 3 / 4 and completely filled respectively, and then seal and press to form under the condition of 180MPa and holding pressure for 30s. When demoulding, first open the side panel of the mold shell, and then erect the slab together with the rubber sleeve, take off the rubber sleeve to expose the slab, and tie the exposed part of the slab compact w...

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Abstract

The invention discloses a super-large-sized high-performance molybdenum alloy plate. The composition of the molybdenum alloy includes: 0.40-0.55% Ti, 0.06-0.12% Zr, 0.05-0.12% C, 0.8-1.2% Hf, and The amount is Mo, and other unavoidable impurities; also provides a preparation method of super large-scale high-performance molybdenum alloy sheet, including: molybdenum alloy powder preparation, press forming, high temperature sintering, rolling deformation processing, annealing heat treatment process. The tensile strength of the large-scale high-performance molybdenum alloy sheet at room temperature is Ra≥1000MPa, the elongation after fracture is A≥10%, the tensile strength at 1000°C is Ra≥500MPa, and the elongation after fracture is A≥20%; the specifications are as follows: Thickness≥5mm, width≥1500mm, length≥2000mm, unit weight≥500kg.

Description

technical field [0001] The invention belongs to the field of rare refractory metals, and in particular relates to a molybdenum alloy plate with super large specifications and high performance and a preparation method thereof. Background technique [0002] Molybdenum and molybdenum alloys are widely used in aviation due to their high melting point, high high temperature strength, low high temperature creep rate, good thermal shock resistance, good thermal conductivity, low linear expansion coefficient and sputtering rate. Aerospace, weapon electronics, nuclear power medical treatment, LED and other fields. With the development of science and technology, more and more occasions need to use molybdenum alloy sheets with super large specifications and high performance. Due to the influence of equipment and technology accumulation, the commonly used solutions generally adopt the method of splicing, but spliced ​​sheets There are disadvantages such as high temperature variability,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04B22F3/04B22F3/10B22F3/18B22F3/24B22F1/00
CPCC22C27/04B22F3/04B22F3/1007B22F3/18B22F3/24B22F2003/248B22F1/14
Inventor 董帝刘国辉苏国平苏国军李旺熊宁王承阳
Owner 安泰天龙钨钼科技有限公司