Super particle size molybdenum powder preparing method

A molybdenum powder and particle size technology is applied in the field of preparation of high melting point alloy powder to achieve the effect of ensuring sintering strength, high sintering strength and good fluidity

Inactive Publication Date: 2008-07-23
JINDUICHENG MOLYBDENUM CO LTD
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  • Claims
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  • Super particle size molybdenum powder preparing method

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preparation example Construction

[0020] A method for preparing super-large particle size molybdenum powder, comprising the following steps:

[0021] (1) Select the appropriate conventional molybdenum powder. The particle size and density of molybdenum powder are moderate (the Fischer particle size is 2.5μm-3.5μm, and the bulk density is 0.9g / cm 3 ~1.1g / cm 3 ), the chemical composition is uniform and qualified (especially the oxygen content is not more than 0.08wt%), the molybdenum powder has a relatively regular appearance, and there is no excessive overlap.

[0022] (2) Compact molding. Use hydraulic presses and molds of sufficient tonnage to press molybdenum powder into blanks to ensure that the pressing force reaches 15MPa-30MPa during the pressing process, and the holding time reaches more than 30s. The size of the compact is determined according to the size of the hydraulic press table.

[0023] (3) Low temperature sintering. Put the compacts into the molybdenum tray one by one, place zirconia balls ...

Embodiment 1

[0026] First, choose the Fibonacci particle size to be 2.76μm, and the bulk density to be 0.98g / cm 3 The molybdenum powder has an oxygen content of 0.067wt%, and its microscopic appearance is shown in Figure 1. Then, on a YA32-315A four-column hydraulic press, the pressing force of 20 MPa and the holding time of 30 s were used to press the compact into a compact, and the compact size was 16mm×60mm×160mm. Put the compacts into the molybdenum tray one by one, place zirconia balls with a particle size of 1 μm to 5 μm between the compacts and the supporting sheet, and use molybdenum wires of φ1 mm to separate the compacts. Put the tray into the muffle furnace, and select the process of 900°C / 2.5h for low-temperature sintering. After heat preservation and sintering, push it into the cooling zone of the muffle furnace to cool for 1 hour, and the flow rate of hydrogen in the muffle furnace is 0.7m 3 / h~0.8m 3 / h. Then the sintered molybdenum slabs are fed one by one to the YGM782...

Embodiment 2

[0029] Other conditions are the same as in Example 1, the selected Fischer particle size is 2.5 μm to 3.5 μm, and the bulk density is 0.9 g / cm 3 ~1.1g / cm 3 , molybdenum powder with an oxygen content of less than 0.08% (weight); pressed into a billet at 15MPa; sintered at a temperature of 800°C for an hour; crushing, ball milling and sieving the sintered billet to prepare a product with an average particle size of 100 μm to 200 μm Molybdenum powder composed of granules. Its shape is relatively round, which can meet the requirements of subsequent use such as thermal spraying.

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Abstract

The invention provides a preparation method of a molybdenum powder with ultra-large granularity, which relates to the preparation method used for an alloy powder with special physical performance and high melting point. The invention is characterized in that the preparation process comprises the following steps that: (1) a molybdenum powder is selected, with the Fisher particle size of 2.5-3.5 Mum, the loose density of 0.9 g/cm<3>-1.1 g/cm<3> and the oxygen content less than 0.08wt%; (2) the selected molybdenum powder is pressed into a blank under the pressure of 15MPa-30MPa; (3) the pressed blank is sintered for 1-5 hours under the temperature of 800-1200 DEG C; (4) the sintered blank is broken, ball milled and screened so as to prepare the molybdenum powder which consists of the grain groups with the average granularity of 100-200 Mum. By adopting the method of the invention, the molybdenum powder which consists of the grain groups with the average granularity of 100-200 Mum can be prepared and more than 80% of the yield can be realized.

Description

technical field [0001] The invention discloses a method for preparing molybdenum powder with super-large particle size, relating to a method for preparing high-melting-point alloy powder with special physical properties. Background technique [0002] With super large particle size (average particle size over 10μm), high specific gravity (loose density up to 2.5g / cm 3 Molybdenum powder with special physical properties such as above), high fluidity (Hall flow rate is more than 30min / 50g), has the incomparable performance of conventional granular molybdenum powder, and shows a wide range of application prospects in aerospace, electronics, automobiles and other fields . [0003] Since it became an independent discipline and professional technology in the 1940s, after more than half a century of development, powder preparation technology has made great progress. At present, powder preparation technology can be divided into gas phase method (including evaporation condensation me...

Claims

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Application Information

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IPC IPC(8): B22F9/04
Inventor 冯鹏发陈强武州
Owner JINDUICHENG MOLYBDENUM CO LTD
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