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A kind of preparation method of sodium-doped molybdenum alloy material

A sodium-doped and molybdenum alloy technology is applied in the field of preparation of sodium-doped molybdenum alloy materials, which can solve the problems of uneven alloy density, long sintering time, adverse effects of processing and use, etc., and achieve good processing performance and use performance, The grain is not easy to grow and the effect of shortening the sintering time

Active Publication Date: 2021-08-10
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are following problems in above-mentioned method: 1. the dihydrate sodium molybdate (Na 2 MoO 4 .2H 2 O) contains two crystalline waters, and at a high temperature of 1200°C to 1600°C in hot isostatic pressing, the crystalline water in sodium molybdate dihydrate will decompose and form water vapor that volatilizes in the billet, affecting the compactness of the billet , in order to increase the density and avoid excessively large and excessive pores in the alloy material after sintering, the required sintering time is long, but it is easy to promote the growth of grains, which will adversely affect subsequent processing and use
2. The temperature of hot isostatic pressing is high (1200℃~1600℃), the pressure is low (45MPa~55MPa), the sintering time is long (3h~5h), and the sodium in the sodium-doped molybdenum billet volatilizes under high temperature and low pressure for a long time The increase of the amount reduces the efficiency of hot isostatic pressing, and the sodium content of the sodium-doped molybdenum alloy is not stable, the uniformity is not good, and it is easy to promote the grain growth, and the alloy density is not uniform, which also affects the subsequent processing and use. to adversely affect

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  • A kind of preparation method of sodium-doped molybdenum alloy material

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Embodiment 1

[0022] Embodiment 1 Preparation of sodium-doped molybdenum alloy material N-1

[0023] (1) According to the design of product N-1, the sodium content of the sodium-doped molybdenum alloy material is designed to be 1%. According to weighing 150% of the sodium content required by the design composition, take the corresponding weight of the analytical grade (purity ≥ 99%) ) sodium molybdate dihydrate and molybdenum dioxide; then dissolve sodium molybdate dihydrate with deionized water, so that the weight of the sodium molybdate solution is 15% by weight of the molybdenum dioxide powder.

[0024] (2) Add the weighed molybdenum dioxide powder into the jacketed spiral mixer, then add the sodium molybdate solution prepared by (1) into the spiral mixer, stir and mix evenly, and then pour the Put steam into the jacket, heat the mixture under stirring condition, the heating temperature is 90°C, and keep stirring until the water evaporates completely, so that the powder is in a loose sta...

Embodiment 2

[0030] The preparation of embodiment 2 sodium-doped molybdenum alloy material N-2

[0031] (1) According to the design of product N-2, the sodium content of the sodium-doped molybdenum alloy material is designed to be 2%, and according to weighing 150% of the sodium content required by the design composition, take the analytically pure grade (purity ≥ 99%) of the corresponding weight ) sodium molybdate dihydrate and molybdenum dioxide; then dissolve sodium molybdate dihydrate with deionized water, so that the weight of the sodium molybdate solution is 15% by weight of the molybdenum dioxide powder.

[0032](2) Add the weighed molybdenum dioxide powder into the jacketed spiral mixer, then add the sodium molybdate solution prepared by (1) into the spiral mixer, stir and mix evenly, and then pour the Put steam into the jacket, heat the mixture under stirring condition, the heating temperature is 85°C, and keep stirring until the water evaporates completely, so that the powder is ...

Embodiment 3

[0039] The preparation of embodiment 3 sodium-doped molybdenum alloy material N-3

[0040] According to the design of product N-3, the sodium content of the sodium-doped molybdenum alloy material is designed to be 2.9%. According to weighing 140% of the sodium content required by the design composition, weigh the corresponding weight of analytically pure grade (purity ≥ 99%) dihydrate Sodium molybdate and molybdenum dioxide; then dissolve sodium molybdate dihydrate with deionized water, so that the weight of the sodium molybdate solution is 20% by weight of the molybdenum dioxide powder.

[0041] (2) Add the weighed molybdenum dioxide powder into the jacketed spiral mixer, then add the sodium molybdate solution prepared by (1) into the spiral mixer, stir and mix evenly, and then pour the Put steam into the jacket, heat the mixture under stirring condition, the heating temperature is 80°C, and keep stirring until the water evaporates completely, so that the powder is in a loose...

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Abstract

The invention discloses a method for preparing a sodium-doped molybdenum alloy material, which comprises the following steps: (1) preparation of a doping solution; (2) doping; (3) preparation of doped molybdenum powder; (4) doping Cold isostatic pressing of molybdenum powder; (5) Calcination of sodium-doped molybdenum billets; (6) Preparation of sodium-doped molybdenum alloy materials. In the method of the present invention, in the sodium doping process, molybdenum powder doping is improved to molybdenum dioxide doping; molybdenum dioxide and sodium molybdate dihydrate are mixed and dried to prepare doped molybdenum dioxide, which is reduced to sodium doped molybdenum dioxide at high temperature. Miscellaneous molybdenum powder, the crystal water in sodium molybdate dihydrate is decomposed from sodium molybdate to form water vapor that volatilizes from the doped molybdenum powder, and the prepared sodium-doped molybdenum alloy powder no longer contains crystal water; After the molybdenum-sodium alloy billet is taken by isostatic pressing and during the hot isostatic pressing process, the billet is more compact, and the sodium-doped molybdenum alloy material produced has stable sodium content and good uniformity, high and uniform density, and fine grain structure , Uniformity, good processability and usability.

Description

technical field [0001] The invention belongs to the technical field of alloy materials and solar cell materials, and in particular relates to a preparation method of a sodium-doped molybdenum alloy material. Background technique [0002] Solar energy is a safe, clean and sustainable new energy, which has been valued by countries all over the world. Our country has made long-term plans for the development and utilization of solar energy. [0003] The first-generation solar cells are crystalline silicon cells, and the second-generation cells are copper indium gallium selenide (CuInGaSe) 2 ) thin-film solar cells, known as CIGS photovoltaic cells. The structure of CIGS photovoltaic cells is that molybdenum (Mo) electrode layer, CIGS light absorption layer, buffer layer, transparent conductive window layer and surface contact layer are sequentially arranged on the substrate. Due to its high energy conversion rate and stable performance, it has been recognized in the photovoltai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/04B22F9/22B22F3/04B22F3/10B22F3/15
CPCB22F3/04B22F3/1007B22F3/15B22F9/22B22F2998/10B22F2999/00C22C1/045C22C27/04B22F2201/01
Inventor 易小明吴建国张外平魏修宇宋立强刘伟
Owner ZHUZHOU HARD ALLOY GRP CO LTD