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Preparation method of molybdenum metal grille

A technology of molybdenum metal and grid, which is applied in the field of preparation of molybdenum metal grid, can solve the problems of poor forming performance and low plasticity, and achieve the effects of good fluidity, dense and uniform particles, and high sphericity

Active Publication Date: 2018-12-18
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares molybdenum powder into spherical molybdenum powder, and then uses a powder bed electron beam 3D printer to prepare a molybdenum metal grid. The spherical molybdenum powder has good fluidity, dense and uniform particles, and is tightly combined after rapid melting, and the heat of the electron beam is high. The characteristics of molybdenum metal overcome the shortcomings of high strength, low plasticity, easy oxidation, poor formability, and difficulty in processing into complex structural and functional parts, and obtain (10mm~100mm)×(10mm~100mm)×(10mm~100mm ) (length × width × height), the size of each square through hole is (1mm~10mm)×(1mm~10mm), the wall thickness of the partition is 0.1mm~1mm molybdenum metal grid, and the molybdenum metal grid is improved Excellent performance, saving the cost of preparation

Method used

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  • Preparation method of molybdenum metal grille

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Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the present embodiment comprises the following steps:

[0036] Step 1, preparation of molybdenum rods:

[0037] Step 101, put the molybdenum powder into the prefabricated rubber sleeve mold, seal it with a rubber stopper after vibration treatment, and then place it in the pressure chamber of the cold isostatic press for 12 minutes of cold isostatic pressing under the condition of a pressure of 180 MPa, Molybdenum rod biscuit is obtained after demolding; the particle size of the molybdenum powder is 3.6 μm, the mass purity of the molybdenum powder is 99.97%, the mass content of oxygen is 1100ppm, and the tap density of the molybdenum powder is 3.5g / cm 3 ;

[0038] Step 102, trimming the outer surface of the molybdenum rod blank obtained in step 101 to remove its corner burrs and surface defects, and then placing it in a vacuum furnace for high-temperature sintering treatment to obtain a molybdenum rod semi-finished product; the specific process...

Embodiment 2

[0048] The preparation method of the present embodiment comprises the following steps:

[0049] Step 1, preparation of molybdenum rods:

[0050] Step 101, put the molybdenum powder into the prefabricated rubber sleeve mold, seal it with a rubber stopper after vibration treatment, and then place it in the pressure chamber of the cold isostatic press for 10 minutes of cold isostatic pressing under the condition of a pressure of 150 MPa, The molybdenum rod biscuit is obtained after demolding; the particle size of the molybdenum powder is 2.0 μm, the mass purity of the molybdenum powder is 99.95%, the mass content of oxygen is 1500 ppm, and the tap density of the molybdenum powder is 2.0 g / cm 3 ;

[0051] Step 102, trimming the outer surface of the molybdenum rod blank obtained in step 101 to remove its corner burrs and surface defects, and then placing it in a vacuum furnace for high-temperature sintering treatment to obtain a molybdenum rod semi-finished product; the specific p...

Embodiment 3

[0061] The preparation method of the present embodiment comprises the following steps:

[0062] Step 1, preparation of molybdenum rods:

[0063] Step 101, put the molybdenum powder into the prefabricated rubber sleeve mold, seal it with a rubber stopper after vibration treatment, and then place it in the pressure chamber of the cold isostatic press for 15 minutes of cold isostatic pressing under the condition of 230 MPa After cold isostatic pressing, molybdenum rod green body is obtained after demoulding; the particle size of the molybdenum powder is 4.5 μm, the mass purity of the molybdenum powder is 99.97%, the mass content of oxygen is 1200ppm, and the tap density of the molybdenum powder is 6.0 g / cm 3 ;

[0064] Step 102, trimming the outer surface of the molybdenum rod blank obtained in step 101 to remove its corner burrs and surface defects, and then placing it in a vacuum furnace for high-temperature sintering treatment to obtain a molybdenum rod semi-finished product...

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Abstract

The invention discloses a preparation method of a molybdenum metal grille. The preparation method comprises the steps of 1, conducting cold isostatic pressing, high-temperature sintering, hot fine forging and straightening treatment on molybdenum powder to obtain a molybdenum rod; 2, machining the molybdenum rod into spherical molybdenum powder through plasma rotating electrode powder manufacturing equipment; and 3, preparing a molybdenum metal grille molded part with the spherical molybdenum powder as a raw material through a powder bed electron beam 3D printer and then conducting annealing,hot isostatic pressing and alkaline washing in sequence to obtain the molybdenum metal grille. According to the preparation method, the molybdenum powder is prepared into the spherical molybdenum powder; the molybdenum metal grille is prepared through the powder bed electron beam 3D printer; according to the characteristics that the spherical molybdenum powder is good in fluidity, compact and uniform in particle and tight in combination after quick melting and the heat of electron beams is high, the defects that molybdenum metal is high in strength, low in plasticity, very easy to oxidize andpoor in formability and is not likely to be machined into complex structural parts and functional parts are overcome, the specification and using properties of the molybdenum metal grille are improved, and the preparation cost is saved.

Description

technical field [0001] The invention belongs to the field of processing refractory metal materials, and in particular relates to a method for preparing a molybdenum metal grid. Background technique [0002] The melting point of molybdenum is 2620°C, the boiling point is 5560°C, and the coefficient of linear expansion is (5.8~6.2)×10 -6 %, molybdenum metal has the advantages of high temperature resistance, corrosion resistance, small expansion coefficient, excellent electrical conductivity and thermal conductivity, etc. At the same time, due to the strong bonding force between molybdenum atoms, molybdenum metal has high strength and high temperature at room temperature and high temperature. hardness. Therefore, molybdenum metal is widely used as an additive in the iron and steel smelting industry, as an electrode and packaging material in the power electronics industry, as a high-temperature resistant nozzle part in the aerospace field, as a corrosion-resistant and temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14B22F3/105B22F3/15B22F5/10B33Y10/00
CPCB22F3/15B22F5/10B22F9/14B33Y10/00B22F2998/10B22F10/00B22F10/25B22F10/28B22F10/64B22F10/50B22F10/80B22F2003/248Y02P10/25
Inventor 韩强王峰何凯李晶
Owner JINDUICHENG MOLYBDENUM CO LTD
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