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Preparation method for rotary roasting and reduction of yttrium oxide doped tungsten composite powder

A technology of composite powder and yttrium oxide, which is applied in the field of rotary calcination and reduction preparation, can solve the problems of low calcination and reduction efficiency, unsuitable for mass production, low furnace body reduction efficiency, etc., and achieves resource saving, efficiency improvement and reduction. Efficiency improvement effect

Inactive Publication Date: 2019-06-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The precursor powder layer is relatively thin, although the powder reduction is sufficient, but the reduction efficiency of the furnace body is low, and the ultrafine nanometer W-Y can be obtained at the same time 2 o 3 There are fewer composite powders, a lot of resources are wasted, and it is very unsuitable for mass production
The calcination and reduction efficiency of this static way of laying precursor powder is particularly low, which restricts W-Y 2 o 3 One of the main links in the mass production of nanocomposite powders

Method used

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  • Preparation method for rotary roasting and reduction of yttrium oxide doped tungsten composite powder
  • Preparation method for rotary roasting and reduction of yttrium oxide doped tungsten composite powder
  • Preparation method for rotary roasting and reduction of yttrium oxide doped tungsten composite powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Taking the single temperature zone rotary furnace BTF-1200C-R as an example, put 30g of precursor powder obtained by the freeze-drying method into a rotary furnace, and adjust the furnace tube speed to 5 rpm;

[0031] (2) Then the precursor powder was calcined at 450°C for 0.5h in an argon atmosphere;

[0032] (3) After two-step reduction in pure hydrogen (550°C, 1.5h; 750°C, 2h) and cooling to room temperature in a hydrogen atmosphere, the ultrafine nanometer W-1wt%Y was finally obtained 2 o 3 Composite powder, marked as A powder.

[0033] (4) For the convenience of comparison, 3g of freeze-dried precursor powder is placed in a rotary furnace, and the furnace tube speed is adjusted to 0 rpm (that is, static powder spreading). The subsequent steps are the same, marked as B powder; 30g of freeze-drying precursor powder is placed in a rotary furnace, and the furnace tube speed is adjusted to 0 rpm (that is, static powder spreading). The subsequent steps are the same...

Embodiment 2

[0035] (1) Taking the single temperature zone rotary furnace BTF-1200C-R as an example, put 20g of precursor powder obtained by the evaporation precipitation method into the rotary furnace, and adjust the furnace tube speed to 10 rpm;

[0036] (2) Then the precursor powder was calcined at 400°C for 2h in an argon atmosphere;

[0037] (3) After two-step reduction in pure hydrogen (550°C, 2h; 800°C, 1h) and cooling to room temperature in a hydrogen atmosphere, the ultrafine nanometer W-0.5wt%Y was finally obtained 2 o 3 Composite powder, marked as A powder.

[0038] (4) For the convenience of comparison, 2g of precursor powder by evaporative precipitation method is placed in a rotary furnace, and the furnace tube speed is adjusted to 0 rpm (that is, static powder spreading). The subsequent steps are the same, marked as B powder; at the same time, use 20g of evaporative precipitation precursor powder is placed in a rotary furnace, and the furnace tube speed is adjusted to 0 rpm...

Embodiment 3

[0040] (1) Taking the single temperature zone rotary furnace BTF-1200C-R as an example, put 20g of precursor powder obtained by the sol-gel method in the rotary furnace, and adjust the furnace tube speed to 3 rpm;

[0041] (2) Then the precursor powder was calcined at 500 °C for 1 h in air atmosphere;

[0042] (3) After two-step reduction in pure hydrogen (650°C, 1h; 700°C, 2h) and cooling to room temperature in a hydrogen atmosphere, the ultrafine nanometer W-1wt%Y was finally obtained 2 o 3 Composite powder, marked as A powder.

[0043] (4) For the convenience of comparison, 2g of sol-gel method precursor powder is placed in a rotary furnace, and the furnace tube speed is adjusted to 0 rpm (i.e. static powder spreading). The subsequent steps are the same and marked as B powder; 20g of sol-gel precursor powder is placed in a rotary furnace, and the furnace tube speed is adjusted to 0 rpm (that is, static powder spreading). The subsequent steps are the same, marked as C powder...

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Abstract

The invention provides a preparation method for rotary roasting and reduction of yttrium oxide doped tungsten composite powder. Precursor powder obtained through various chemical methods is put in a rotary furnace, and the rotating speed of a furnace pipe is adjusted; the precursor powder is roasted in the furnace; and then two-step reduction is carried out in the reducing atmosphere, cooling is carried out in the reducing atmosphere to room temperature, and finally the ultrafine yttrium oxide doped tungsten composite powder is obtained. The preparation method for rotary roasting and reductionis suitable for precursor powder prepared by all chemical methods; and meanwhile, compared with traditional roasting and reduction of precursor powder, the reduction efficiency of the preparation method for rotary roasting and reduction can be improved by 10 times or above. Meanwhile, resources are saved, cost is reduced, and time is saved.

Description

technical field [0001] The invention provides a rotary calcination and reduction preparation method for yttrium oxide-doped tungsten composite powder, which belongs to the technical field of powder preparation engineering. Background technique [0002] Tungsten-based alloys are widely used in superalloys, cemented carbides and other fields because of their many excellent properties. At the same time, tungsten is considered to be the most likely candidate material for future fusion reactor PFM. Due to the high melting point of tungsten, tungsten-based alloys are generally prepared by powder metallurgy. However, tungsten-based alloys also have many problems that need to be solved urgently, such as difficulty in sintering densification, low temperature brittleness, recrystallization embrittlement, etc. Studies have shown that Y 2 o 3 It is the best oxide dispersed phase. [0003] At the same time, the finer the powder, the higher the sintering activity. At present, the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00C22C1/05C22C27/04C22C1/10
Inventor 马宗青扈伟强董智孔祥炜刘永长郭倩颖余黎明李冲刘晨曦
Owner TIANJIN UNIV
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