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Method for preparing lanthanum-doped alloy molybdenum powder

An alloy and molybdenum powder technology, applied in the field of material preparation, can solve the problems of increasing production cost and environmental pollution, and achieve the effects of preventing moisture absorption, reducing errors and improving uniformity

Active Publication Date: 2014-04-09
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 doped lanthanum alloy molybdenum powder comprises the steps:

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

[0036] Take MoO 3 Powder is used as raw material, and the Fischer particle size is 0.1 μm La 2 o 3 ·xH 2 O powder as an additive, where La 2 o 3 The mass of La 2 o 3 ·xH 2 The mass fraction of O powder total mass 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 the reduction furnace, and a stage of reduction is carried out under the hydrogen atmosphere, and the reduced MoO 2 Sieve through a 40-mesh sieve to prepare MoO 2 Powder 1470.2kg;

[0039] The third step is to prepare the primary mix

[0040] Get the MoO that 50kg second step makes 2 powder with 12.5kg of La 2 o 3 ·xH 2 O powder is sieved, selects 40 mesh sieves during sieving, La 2 o 3 ·xH 2 O powder was uniformly added to MoO 2 In the powder, sieve repeatedly 4 times ...

Embodiment 2

[0049] The preparation method of doped lanthanum alloy molybdenum powder comprises the steps:

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

[0051] Take MoO 3 Powder is used as raw material, and the Fischer particle size is 0.3 μm La 2 o 3 ·xH 2 O powder as an additive, where La 2 o 3 The mass of La 2 o 3 ·xH 2 The mass fraction of O powder total mass 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 the reduction furnace, and a stage of reduction is carried out under the hydrogen atmosphere, and the reduced MoO 2 Sieve through a 60-mesh sieve to prepare MoO 2 Powder 1041.2kg;

[0054] The third step is to prepare the primary mix

[0055] Get the MoO that 20kg second step makes 2 powder with 9.84kg of La 2 o 3 ·xH 2 O powder is sieved, and 60 mesh screens are selected for use during sieving, and La 2 o 3 ·xH 2 O powder was uniformly added to MoO 2 In the powder, sie...

Embodiment 3

[0064] The preparation method of doped lanthanum alloy molybdenum powder comprises the steps:

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

[0066] Take MoO 3 Powder is used as raw material, and the Fischer particle size is selected as 0.5 μm La 2 o 3 ·xH 2 O powder as an additive, where La 2 o 3 The mass of La 2 o 3 ·xH 2 The mass fraction of O powder total mass 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 the reduction furnace, and a stage of reduction is carried out under the hydrogen atmosphere, and the reduced MoO 2 Sieve through a 120-mesh sieve to prepare MoO 2 Powder 589.9kg;

[0069] The third step is to prepare the primary mix

[0070] Get the MoO that 20kg second step makes 2 powder with 20.2kg of La 2 o 3 ·xH 2 O powder is sieved, and 120 mesh screens are selected for use during sieving, and La 2 o 3 ·xH 2 O powder was uniformly added to MoO 2 In th...

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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 in particular relates to a preparation method of lanthanum-doped molybdenum alloy powder. Background technique [0002] Adding rare earth La to pure molybdenum can not only improve the strength and toughness of molybdenum products, but also increase the recrystallization temperature of molybdenum, improve the room temperature brittleness of molybdenum materials, and make molybdenum materials have good thermal electron emission performance, so La-doped molybdenum alloys are used 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 doping lanthanum in 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 molybdenum powder mixed. The method has the advanta...

Claims

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Application Information

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Patent Type & Authority Applications(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
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