A kind of preparation method of vanadium slag/calcium oxide diffusion couple

A calcium oxide and diffusion couple technology, applied in the field of material research, can solve the problems of not finding calcium oxide, not finding it, deliquescence, etc., to reduce deliquescence degeneration and avoid cracking.

Inactive Publication Date: 2020-04-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there is no precedent for studying the solid-phase reaction of vanadium slag / calcium oxide diffusion couple by preparing vanadium slag / calcium oxide diffusion couple, let alone a method to avoid deliquescence of calcium oxide in the diffusion couple

Method used

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  • A kind of preparation method of vanadium slag/calcium oxide diffusion couple
  • A kind of preparation method of vanadium slag/calcium oxide diffusion couple
  • A kind of preparation method of vanadium slag/calcium oxide diffusion couple

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Embodiment 1

[0050] This embodiment provides a method for preparing a vanadium slag / calcium oxide diffusion couple, comprising the following steps:

[0051] S1. Use a high-energy ball mill to mill 30g of calcium oxide powder at a speed of 150r / min for 3 hours, then dry it, and use a field emission scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) to characterize the calcium oxide powder. The characterization results are as follows figure 1 shown. Depend on figure 1 It can be seen that the particle size of the calcium oxide powder is relatively uniform, and the particle size is about 200nm.

[0052] The calcium oxide powder was put into a stainless steel mold with an inner diameter of 30mm, and a pressure of 14130N was applied by a tablet press to press the calcium oxide powder into a tablet with a diameter of 30mm and a thickness of 5mm. Place the prepared sheet in a vacuum hot-press furnace for sintering: set the pressure of the vacuum hot-press furnace to 14130N, wh...

Embodiment 2

[0060] This embodiment provides a method for preparing a vanadium slag / calcium oxide diffusion couple, comprising the following steps:

[0061] S1. Mill 20g of calcium oxide powder with a high-energy ball mill at a speed of 200r / min for 1 hour, and then dry it. Put the calcium oxide powder after ball milling and drying into a stainless steel mold with an inner diameter of 30mm, and press the calcium oxide powder into a tablet with a diameter of 30mm and a thickness of 5mm by applying a pressure of 13800N by a tablet press. Place the prepared sheet in a vacuum hot-press furnace for sintering: set the pressure of the vacuum hot-press furnace to 13800N, when the vacuum degree reaches 160Pa, raise the temperature to 1563K at a heating rate of 10K / min, and after holding for 80min, heat it to 20K / min cooling rate down to 873K, and then down to room temperature at a cooling rate of 10K / min. Then the tablet is taken out, and the upper and lower circular surfaces of the tablet are gr...

Embodiment 3

[0068] This embodiment provides a method for preparing a vanadium slag / calcium oxide diffusion couple, comprising the following steps:

[0069] S1. Mill 30g of calcium oxide powder with a high-energy ball mill at a speed of 300r / min for 2 hours, and then dry it. Put the calcium oxide powder after ball milling and drying into a stainless steel mold with an inner diameter of 30mm, and press the calcium oxide powder into a tablet with a diameter of 30mm and a thickness of 5mm by applying a pressure of 14890N by a tablet press. Place the prepared sheet in a vacuum hot-press furnace for sintering: set the pressure of the vacuum hot-press furnace to 14890N, when the vacuum reaches 180Pa, raise the temperature to 1553K at a heating rate of 10K / min, and after holding for 100min, heat it up to 1553K at a temperature of 20K / min cooling rate down to 873K, and then down to room temperature at a cooling rate of 10K / min. Then the tablet is taken out, and the upper and lower circular surfa...

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Abstract

The invention belongs to the technical field of material research methods, and in particular relates to a vanadium slag / calcium oxide diffusion couple and a preparation method thereof. The method comprises the following steps: S1, calcium oxide powder is subjected to tabletting, vacuum hot pressing sintering and grinding and polishing to obtain a calcium oxide tablet; S2, the vanadium slag is tabletted on two side surfaces of the calcium oxide tablet to obtain a vanadium slag-calcium oxide-vanadium slag three-layer tablet billet; S3, the vanadium slag-calcium oxide-vanadium slag three-layer tablet billet is subjected to vacuum hot pressing sintering to obtain a pre-sintered composite tablet; and S4, the pre-sintered composite tablet is coated in a coating base material, the pre-sintered composite tablet coated with the coating base material is subjected to pressurizing and vacuum hot pressing heating, and a core-shell structure is obtained, and the core-shell structure is sintered to obtain a vanadium slag / calcium oxide diffusion couple. The method can greatly reduce deliquescence degeneration of calcium oxide, and besides, needed technical support is provided for exploration on the solid phase reaction of the vanadium slag and the calcium oxide.

Description

technical field [0001] The invention belongs to the technical field of material research methods, and in particular relates to a preparation method of a vanadium slag / calcium oxide diffusion couple. Background technique [0002] Vanadium is an important strategic resource known as "industrial vitamin". It is widely used in steel, chemical industry, aerospace and other fields, and can significantly improve the toughness and heat resistance of steel. Vanadium production enterprises mainly adopt the vanadium extraction process of "vanadium slag sodium roasting-water immersion" to produce vanadium oxide products. This process has the advantages of mature technology, simple operation, and good product quality, but the content of calcium and silicon in vanadium slag is strictly limited. , the cost of auxiliary materials is high, and a large amount of solid waste such as sodium sulfate is produced by-product, and the economic and environmental problems are more prominent. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32G01N1/36G01N1/44
CPCG01N1/286G01N1/32G01N1/36G01N1/44G01N2001/2866G01N2001/366
Inventor 岳宏瑞韦旺薛向欣
Owner NORTHEASTERN UNIV LIAONING
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