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Preparation method of lanthanum-doped molybdenum alloy powder

A technology of alloy and molybdenum powder, which is applied in the field of material preparation, can solve problems such as increasing production costs and environmental pollution, and achieve the effects of preventing moisture absorption, reducing errors, and improving uniformity

Active Publication Date: 2015-07-29
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of preparation method of lanthanum-doped alloy molybdenum powder, solve existing solid-liquid doping and liquid-liquid doping and can produce NO, NO when preparing lanthanum-doped alloy molybdenum powder 2 Such as nitrogen oxides, pollute the environment, and increase the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of lanthanum-doped molybdenum powder includes the following steps:

[0035] The first step is the selection of raw materials

[0036] Take MoO 3 The powder is used as the raw material, and the Fischer particle size is selected as 0.1μm La 2 O 3 ·XH 2 O powder is used as an additive, among which La 2 O 3 The quality of La 2 O 3 ·XH 2 The mass parts of the total mass of O powder is 85%;

[0037] The second step is to prepare MoO 2 powder

[0038] The MoO obtained in the first step 3 The powder is put into a reduction furnace, and a stage of reduction is carried out under a hydrogen atmosphere to reduce the MoO 2 Sieve through a 40 mesh screen to prepare MoO 2 Powder 1470.2kg;

[0039] The third step is to prepare the initial mixture

[0040] Take 50kg of MoO prepared in the second step 2 Powder and 12.5kg of La 2 O 3 ·XH 2 O powder is sieved, and a 40-mesh sieve is selected when sieving, and La 2 O 3 ·XH 2 O powder is evenly added to MoO 2 In the powder, sieve...

Embodiment 2

[0049] The preparation method of lanthanum-doped molybdenum powder includes the following steps:

[0050] The first step is the selection of raw materials

[0051] Take MoO 3 The powder is used as the raw material, and the Fischer particle size is selected as 0.3μm La 2 O 3 ·XH 2 O powder is used as an additive, among which La 2 O 3 The quality of La 2 O 3 ·XH 2 The mass parts of the total mass of O powder is 86%;

[0052] The second step is to prepare MoO 2 powder

[0053] The MoO obtained in the first step 3 The powder is put into a reduction furnace, and a stage of reduction is carried out under a hydrogen atmosphere to reduce the MoO 2 Sieve through a 60 mesh screen to prepare MoO 2 1041.2kg of powder;

[0054] The third step is to prepare the initial mixture

[0055] Take 20kg of MoO prepared in the second step 2 Powder and 9.84kg of La 2 O 3 ·XH 2 O powder is sieved, and a 60-mesh sieve is selected when sieving, and La 2 O 3 ·XH 2 O powder is evenly added to MoO 2 The powder is sie...

Embodiment 3

[0064] The preparation method of lanthanum-doped molybdenum powder includes the following steps:

[0065] The first step is the selection of raw materials

[0066] Take MoO 3 The powder is used as the raw material, and the Fisher particle size is 0.5μm La 2 O 3 ·XH 2 O powder is used as an additive, among which La 2 O 3 The quality of La 2 O 3 ·XH 2 The mass parts of the total mass of O powder is 87%;

[0067] The second step is to prepare MoO 2 powder

[0068] The MoO obtained in the first step 3 The powder is put into a reduction furnace, and a stage of reduction is carried out under a hydrogen atmosphere to reduce the MoO 2 Sieving through a 120 mesh screen to prepare MoO 2 589.9kg of powder;

[0069] The third step is to prepare the initial mixture

[0070] Take 20kg of MoO prepared in the second step 2 Powder and 20.2kg of La 2 O 3 ·XH 2 O powder is sieved. When sieving, a 120 mesh screen is selected. During the sieving process, La 2 O 3 ·XH 2 O powder is evenly added to MoO 2 In th...

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PUM

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Abstract

The invention discloses a method for preparing lanthanum-doped alloy molybdenum powder. The method includes the steps of selecting raw materials, preparing MoO2 powder, preparing initial mixed materials, preparing lanthanum-doped MoO2 pre-mixing material matrixes, preparing lanthanum-doped MoO2 and preparing the lanthanum-doped alloy molybdenum powder. The method solves the problems that nitric oxides like NO and NO2 can be generated in the process of preparing the lanthanum-doped alloy molybdenum powder in an existing solid-liquid doping method and an existing liquid-liquid doping method, environment can be polluted and production cost is increased. The method is combined with advantages of a solid-solid doping method and a water spraying method, and the nitric oxides will not be generated; La2O3 xH2O powder is used as additives, the uniformity of La contents of products is improved, and the phenomenon of moisture absorption is prevented; a great number of lanthanum-doped MoO2 pre-mixing material matrixes can be prepared at a time and used for preparing the lanthanum-doped MoO2 in batches, and therefore errors of the La contents among batches are reduced; different types of lanthanum-doped MoO2 can be prepared by adjusting the added amount of the pre-mixing material matrixes, and finally the La contents in the products can be changed.

Description

Technical field [0001] The invention belongs to the technical field of material preparation, and specifically relates to a preparation method of lanthanum-doped alloy molybdenum powder. Background technique [0002] The addition of rare earth La to pure molybdenum can not only increase the strength and toughness of molybdenum products, but also increase the recrystallization temperature of molybdenum, improve the brittleness of molybdenum materials at room temperature, and make molybdenum materials have good thermionic emission properties. Therefore, La-doped molybdenum alloys are It is widely used in the preparation of electrode materials, wire cutting materials, electric light sources and other industries. At present, there are three main methods for adding lanthanum to molybdenum powder at home and abroad: [0003] Solid-solid doping. This method mainly combines lanthanum with MoO in the form of solid pure metal or oxide. 2 Or mixed with molybdenum powder. The method has low p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22C22C27/04C22C1/04C22B5/12
Inventor 付小俊肖江涛刘秋萍安鹏飞曾毅白阳张岁虎
Owner JINDUICHENG MOLYBDENUM CO LTD