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Preparation method of molybdenum-tungsten alloy powder

A molybdenum-tungsten alloy and molybdenum-tungsten technology is applied in the field of powder material preparation, which can solve the problems of uneven particles and poor uniformity of molybdenum-tungsten alloy powder, and achieve the effects of small quality difference, improved uniformity and large hybrid power.

Inactive Publication Date: 2020-01-17
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw materials used in this method are molybdenum powder and tungsten powder, which itself has a certain particle volume and quality. Even if the mechanical mixing is sufficient, the particles are always uneven, and then the uniformity of the molybdenum-tungsten alloy powder is poor.

Method used

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  • Preparation method of molybdenum-tungsten alloy powder
  • Preparation method of molybdenum-tungsten alloy powder
  • Preparation method of molybdenum-tungsten alloy powder

Examples

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Embodiment 1

[0028] This embodiment includes the following steps:

[0029] Step 1. Prepare a mixed solution of ammonium molybdate and ammonium tungstate: mix 800.15g deionized water and 400.26g ammonia water to obtain diluted ammonia water, and then mix the Add 267.21g of molybdenum trioxide and 67.18g of tungstic acid into diluted ammonia water and stir to dissolve for 1 hour. The supernatant obtained after solid-liquid separation is a mixed solution of ammonium molybdate and ammonium tungstate;

[0030]Step 2, preparing the molybdenum-tungsten composite oxide precursor: using a spray drying tower to spray dry the mixed solution of ammonium molybdate and ammonium tungstate obtained in step 1 to obtain a molybdenum-tungsten composite oxide precursor; the spray drying process Among them, the air inlet temperature of the spray drying tower is 251°C, the air outlet temperature is 154°C, and the atomizer speed of the spray drying tower is 1.9×10 4 r / min;

[0031] Step 3. Preparation of molyb...

Embodiment 2

[0036] This embodiment includes the following steps:

[0037] Step 1. Prepare a mixed solution of ammonium molybdate and ammonium tungstate: mix 1500.36g deionized water and 1499.98g ammonia water to obtain diluted ammonia water, and then mix the Add 751.33g of molybdenum trioxide and 750.55g of tungstic acid into diluted ammonia water and stir to dissolve for 1.5h. The supernatant obtained after solid-liquid separation is a mixed solution of ammonium molybdate and ammonium tungstate;

[0038] Step 2, preparing the molybdenum-tungsten composite oxide precursor: using a spray drying tower to spray dry the mixed solution of ammonium molybdate and ammonium tungstate obtained in step 1 to obtain a molybdenum-tungsten composite oxide precursor; the spray drying process Among them, the air inlet temperature of the spray drying tower is 205°C, the air outlet temperature is 110°C, and the atomizer speed of the spray drying tower is 0.8×10 4 r / min;

[0039] Step 3. Preparation of mol...

Embodiment 3

[0044] This embodiment includes the following steps:

[0045] Step 1. Prepare a mixed solution of ammonium molybdate and ammonium tungstate: mix 1200.65g deionized water and 800.19g ammonia water to obtain diluted ammonia water, and then mix the Add 500.91g of molybdenum trioxide and 300.12g of tungstic acid into diluted ammonia water and stir to dissolve for 1.5h. The supernatant obtained after solid-liquid separation is a mixed solution of ammonium molybdate and ammonium tungstate;

[0046] Step 2, preparing the molybdenum-tungsten composite oxide precursor: using a spray drying tower to spray dry the mixed solution of ammonium molybdate and ammonium tungstate obtained in step 1 to obtain a molybdenum-tungsten composite oxide precursor; the spray drying process Among them, the air inlet temperature of the spray drying tower is 235°C, the air outlet temperature is 151°C, and the atomizer speed of the spray drying tower is 1.5×10 4 r / min;

[0047] Step 3. Preparation of moly...

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Abstract

The invention discloses a preparation method of molybdenum-tungsten alloy powder. The method comprises the steps that firstly, molybdenum trioxide and tungstic acid are added into diluted ammonia water to be dissolved to obtain an ammonium molybdate and ammonium tungstate mixed solution; secondly, the ammonium molybdate and ammonium tungstate mixed solution is sprayed and dried to obtain a molybdenum-tungsten composite oxide precursor; thirdly, the molybdenum-tungsten composite oxide precursor is subjected to roasting decomposition under the temperature gradient condition to obtain a molybdenum-tungsten composite oxide; fourthly, the molybdenum-tungsten composite oxide is subjected to first-stage reduction under the hydrogen condition to obtain a molybdenum-tungsten low-valence oxide; andfifthly, the molybdenum-tungsten low-valence oxide is subjected to second-stage reduction under the hydrogen condition to obtain the molybdenum-tungsten alloy powder. The molybdenum-tungsten alloy powder is prepared by fully mixing molybdate ions and tungstate ions and conducting roasting and reduction, so that size and mass differences of molybdenum particles and tungsten particles are small, hybrid power is high, the uniformity of the molybdenum-tungsten alloy powder is improved, and the problem of insufficient uniformity caused by mechanical mixing of molybdenum powder and tungsten powder is eliminated.

Description

technical field [0001] The invention belongs to the technical field of powder material preparation, in particular to a method for preparing molybdenum-tungsten alloy powder. Background technique [0002] Molybdenum and tungsten are the elements of the fifth and sixth periods of the sixth subgroup in the periodic table of elements, and they are refractory metals with relatively similar physical and chemical properties. Molybdenum and tungsten are mainly used in metal products, catalysts in petroleum smelting, and metal targets in the electronics industry in industrial production. [0003] Molybdenum-tungsten alloy powder is the raw material for preparing molybdenum-tungsten alloy. The uniformity of molybdenum-tungsten alloy powder directly affects the high-temperature strength and service life of molybdenum-tungsten alloy. The traditional method of preparing molybdenum-tungsten alloy powder is a mechanical mixing method. The steps are: 1. Mechanically mix molybdenum powder a...

Claims

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Application Information

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IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 厉学武唐丽霞曹维成刘东新席莎崔玉青郭军刚陈强姚成安耿张菊平罗建海
Owner JINDUICHENG MOLYBDENUM CO LTD
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