Preparation method of rare earth molybdenum alloy with different grain sizes

A technology of grain size and molybdenum alloy, which is applied in the field of preparation of rare earth molybdenum alloys with different grain sizes, can solve the problems of limited grain size adjustment range, difficulty in meeting large-scale grain adjustment, and limited maximum temperature adjustment range, etc., to achieve The effect of low cost, meeting the needs of grain size, and wide adjustment range

Active Publication Date: 2017-07-25
JINDUICHENG MOLYBDENUM CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this method to adjust the grain size of the rare earth molybdenum alloy, it is often limited by the maximum temperature of the sintering equipment, and the adjustment range of the maximum temperature is limited, so the grain size of the rare earth molybdenum alloy can only be adjusted within a small range.
Moreover, even if the equipment temperature can meet the higher temperature requirements, since the powder characteristics have been finalized, the adjustment range of the grain size obtained by sintering is quite limited, and it is difficult to meet the large-scale adjustment of the grain size between 20 and 2000 μm

Method used

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Examples

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Effect test

preparation example Construction

[0022] In the preparation method of rare earth molybdenum alloys with different grain sizes of the present invention, the first step adopts rare earth oxide powder and MoO 2 The powder solid-solid mixing method, in the process of solid-solid mixing, deionized water is sprayed into the mixer by spraying the mixed material, and the final prepared rare earth molybdenum can be controlled according to the amount of deionized water added. The grain size of the alloy, after the materials are mixed evenly and dried, the mixed material is obtained, and then the mixed material is placed in a hydrogen reduction furnace for reduction treatment to obtain doped molybdenum powder. Compared with other reduction furnaces, the hydrogen reduction furnace is the most suitable In the reduction reaction of the above-mentioned mixed materials; then the above-mentioned doped molybdenum powder is placed in an intermediate frequency furnace for sintering to prepare a rare earth molybdenum alloy with a r...

Embodiment 1

[0028] Prepare the rare earth molybdenum alloy with an average grain size of 20 μm, the steps are as follows:

[0029] The first step, solid-solid mixing

[0030] Take MoO 2 Powder and La 2 o 3 Powder, put the above two powders into the vacuum drying equipment for mixing, and spray deionized water into the vacuum drying equipment while mixing. 2 Add 0.01L of deionized water to the powder to obtain a mixed material;

[0031] The second step, restore

[0032] Place the mixed material prepared in the first step in a hydrogen reduction furnace for reduction, the reduction temperature is 800°C, and the reduction time is 8 hours to obtain doped molybdenum powder;

[0033] The third step, sintering

[0034] The doped molybdenum powder obtained in the second step is placed in an intermediate frequency furnace for sintering. The sintering temperature is 1700°C, and the heating rate of the intermediate frequency furnace is 6°C per minute. Finally, a rare earth molybdenum alloy wit...

Embodiment 2

[0036] The rare earth molybdenum alloy with an average grain size of 500 μm is prepared, and the steps are as follows:

[0037] The first step, solid-solid mixing

[0038] Take MoO 2 Powder and Y 2 o 3 Powder, put the above two powders into the vacuum drying equipment for mixing, and spray deionized water into the vacuum drying equipment while mixing. 2 Add 0.06L of deionized water to the powder to obtain a mixed material;

[0039] The second step, restore

[0040] The mixed material prepared in the first step is placed in a hydrogen reduction furnace for reduction, the reduction temperature is 1000°C, and the reduction time is 4 hours to obtain doped molybdenum powder;

[0041] The third step, sintering

[0042] The doped molybdenum powder obtained in the second step is placed in an intermediate frequency furnace for sintering. The sintering temperature is 1900°C, and the heating rate of the intermediate frequency furnace is 1°C per minute. Finally, a rare earth molybde...

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Abstract

The preparation method of the rare earth molybdenum alloy with different grain sizes disclosed by the invention comprises three steps of solid-solid mixing, reduction and sintering. The preparation method of rare earth molybdenum alloys with different grain sizes in the present invention realizes rare earth molybdenum alloys by controlling the addition method and amount of water in the doping process, and without making too complicated changes to the existing sintering process and sintering method. The molybdenum alloy grain size can be adjusted in a large range between 20 and 2000 μm. The method is simple in operation, low in cost, strong in controllability, and has a wide adjustment range of grain size, and meets the requirements of different products on the grain size of the rare earth molybdenum alloy.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of rare earth molybdenum alloys with different grain sizes. Background technique [0002] Molybdenum is a rare and insoluble metal with a melting point as high as 2620 ° C. Adding rare earth elements La, Y or Nd oxide La to molybdenum 2 o 3 , Y 2 o 3 、Nd 2 o 3 The formation of rare earth molybdenum alloys can effectively increase the recrystallization temperature of molybdenum and improve its room temperature brittleness, and is widely used in the preparation of wire cutting materials, high temperature furnace heating elements, high temperature resistant components of electric light sources, heat shielding materials, etc. [0003] According to the different uses of the prepared products, the requirements for the grain size of rare earth molybdenum alloys are quite different. For example, when preparing heat shielding materials, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05
Inventor 曾毅付小俊肖江涛刘秋萍安鹏飞白阳张岁虎冯鹏发张菊平
Owner JINDUICHENG MOLYBDENUM CO LTD
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