Method for preparing molybdenum powder for preparing molybdenum end cap of magnetron

A molybdenum end cap and magnetron technology, which is applied in the field of metal powder manufacturing, can solve the problems of low atomization rate, low production efficiency, and low yield of atomizers, so as to avoid pollution and damage the environment, high production efficiency, The effect of high yield

Active Publication Date: 2014-01-01
JINDUICHENG MOLYBDENUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The Chinese patent "a special molybdenum powder for automatic forming and its preparation method" with the publication number CN101786160A discloses a special molybdenum powder that can be directly applied to the automatic forming of precision devices in the machinery and electronics industries. Polyethylene glycol, stearic acid metal salt, ammonium polyacrylate and other additives, the time to prepare the slurry is as long as 10h~36h, and the temperature of the air inlet and outlet of the spray tower is too high, and the atomization rate of the atomizer is low, resulting in This method has low production efficiency, low yield and high energy consumption

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  • Method for preparing molybdenum powder for preparing molybdenum end cap of magnetron

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Embodiment 1

[0023] The preparation method of the molybdenum powder for the preparation of the magnetron molybdenum end cap of the present embodiment is as follows:

[0024] Step 1. Stir polyvinyl alcohol and deionized water at a mass ratio of 1:100 for 34 minutes at a temperature of 86° C. to form a binder; the average degree of polymerization of the polyvinyl alcohol is 1300, and the degree of alcoholysis is 89 %;

[0025] Step 2, stirring the raw material molybdenum powder with the binder and the Fischer grain size of 3.5 μm and a mass purity of 99.9% in the step 1 at a temperature of 20° C. for 50 minutes to obtain a slurry; The mass fraction of ionized water is 20%;

[0026] Step 3. Put the slurry described in step 2 into a spray drying tower for granulation to obtain pellets; the temperature of the air inlet of the spray drying tower is 210°C, the temperature of the air outlet is 140°C, and the spray drying tower is atomized The rotational speed of the tor is 1.5 x 10 4 r / min, the...

Embodiment 2

[0030] The preparation method of the molybdenum powder for the preparation of the magnetron molybdenum end cap of the present embodiment is as follows:

[0031] Step 1. Stir polyvinyl alcohol and deionized water at a mass ratio of 1.3:100 at a temperature of 80°C for 50 minutes to form a binder; the average degree of polymerization of the polyvinyl alcohol is 2000, and the degree of alcoholysis is 90 %;

[0032] Step 2, stirring the raw material molybdenum powder with the binder and the Fischer particle size of 2.0 μm and a mass purity of 99.5% in step 1 at a temperature of 21° C. for 30 minutes to obtain a slurry; The mass fraction of ionized water is 25%;

[0033] Step 3. Put the slurry described in step 2 into a spray drying tower for granulation to obtain pellets; the air inlet temperature of the spray drying tower is 240°C, the air outlet temperature is 100°C, and the spray drying tower is atomized The rotational speed of the tor is 1.5 x 10 4 r / min, the atomization ra...

Embodiment 3

[0037] The preparation method of the molybdenum powder for the preparation of the magnetron molybdenum end cap of the present embodiment is as follows:

[0038] Step 1. Stir polyvinyl alcohol and deionized water at a mass ratio of 1.8:100 at a temperature of 95°C for 30 minutes to form a binder; the average degree of polymerization of the polyvinyl alcohol is 1800, and the degree of alcoholysis is 99 %;

[0039] Step 2, the binder described in step 1 and the Fibonacci particle size are 2.5 μ m, and the raw material molybdenum powder with a mass purity of 99.8% is stirred at a temperature of 22° C. for 40 minutes to obtain a slurry; The mass fraction of ionized water is 28%;

[0040] Step 3. Put the slurry described in step 2 into a spray drying tower to granulate to obtain pellets; the air inlet temperature of the spray drying tower is 200°C, the air outlet temperature is 130°C, and the spray drying tower is atomized The rotational speed of the tor is 1.9×10 4 r / min, the at...

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Abstract

The invention provides a method for preparing molybdenum powder for preparing a molybdenum end cap of a magnetron, comprising the following steps of: 1, preparing polyvinyl alcohol and water into adhesives; 2, mixing the adhesives and molybdenum powder serving as a raw material into slurry; 3, placing the slurry in a spray drying tower for granulation to obtain granules; and 4, sieving the granules to obtain molybdenum powder for preparing the molybdenum end cap of the magnetron. The method for preparing the molybdenum powder for preparing the molybdenum end cap of the magnetron has the advantages of high production efficiency and yield, and low energy consumption; the prepared molybdenum powder has even granule, and good fluidity and formability; and the molybdenum end cap of the magnetron prepared by the method has the advantages of even and consistent density, small size deviation and high working performance.

Description

technical field [0001] The invention belongs to the technical field of metal powder manufacturing, and in particular relates to a method for preparing molybdenum powder for magnetron molybdenum end caps. Background technique [0002] Magnetron is a kind of microwave electron tube. It has the characteristics of simple structure, high working efficiency, low working voltage, and strong ability to adapt to load changes. It has been widely used in household appliances such as microwave ovens, industrial equipment such as high-frequency heating equipment, and AC radar systems. widely used. [0003] The molybdenum end cap is an important part of the magnetron. It is used to support the microwave transmitting coil of the magnetron, and at the same time block the axial divergence of thermal electrons, so that a uniform charge distribution is formed in the effective space to ensure the stability of microwave emission. [0004] Molybdenum end cap is a molybdenum product with complex ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08
Inventor 刘俊怀罗锋丁飞
Owner JINDUICHENG MOLYBDENUM CO LTD
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