Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for manufacturing large-size thorium-tungsten blank bars

A large-size, thorium-tungsten technology is applied in the field of manufacturing large-size thorium-tungsten billets, which can solve the problems of large crystallites, high-temperature burning loss, and difficulty in uniform particle weight distribution, and achieves reduction of process costs and shortening of the process. , the effect of improving production efficiency

Active Publication Date: 2011-04-13
XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current situation where global resources and energy are increasingly tense, the industrial production of small billets is no longer suitable for the requirements of the low-carbon era
However, during the preparation and sintering of large-sized thoriated tungsten billets, it is easy to cause the problem of sporadic large crystals in the center of the thoriated tungsten billet and the problem of ThO 2 Hidden danger of high temperature burning, it is difficult to guarantee ThO 2 The particles are evenly distributed in the tungsten matrix

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Thorium-doped tungsten powder (tungsten powder doped with thorium oxide powder, 98.0% of tungsten powder and 2.0% of thorium oxide powder by weight) with different particle sizes is used for pressing, and the average particle size is fuss1.56μm. After cold isostatic pressing, the billet is pressed into a billet with a powder content of 2.5kg and a cross-section of Φ18.5-19.5mm. Pre-sintering was carried out under a hydrogen atmosphere at 1350°C. Afterwards, the high-temperature sintering process was adjusted, and the temperature was raised from room temperature to the first holding zone for 1.5 minutes. The current of the first holding zone was 2000A, the holding time was 2 minutes, and the temperature range was 1600-1700°C; Then heat up to the second heat preservation zone in 4 minutes. The current of the second heat preservation zone is 3760A. The heat preservation time is 8 minutes. 4700A, holding time 30min, temperature range 2700~2780℃. After vertical melting, the...

example 2

[0020] Doped thorium tungsten powder with different particle sizes (mixed and dried powder of tungsten powder and thorium nitrate solution, wherein the tungsten powder is 97.0% by weight and thorium nitrate is 3.0%) is used for pressing, and the average particle size is Fisher's particle size fsss1. 62 μm. After cold isostatic pressing, the billet is pressed into a billet with a powder content of 3kg and a cross-section of Φ19.5-20.5mm. Carry out pre-sintering under a hydrogen atmosphere at 1350°C, adjust the high-temperature sintering process, and heat up from room temperature to the first holding zone in 2 minutes. The current in the first holding zone is 2000A, holding time is 2 minutes, and the temperature range is 1500-1650°C; then heat up in 5 minutes To the second heat preservation zone, the current of the second heat preservation zone is 3920A, the heat preservation time is 8min, the temperature range is 2100~2500℃, and then the temperature is raised to the third heat ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fisherman's average particle sizeaaaaaaaaaa
Fisherman's particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for manufacturing large-size thorium-tungsten blank bars and belongs to the manufacturing field of powder metallurgy. The method comprises the steps of prepressing, presintering, high-temperature sintering and the like and concretely comprises: pressing doped thorium-tungsten powder of different grain sizes; and subjecting the pressed thorium-tungsten powder to isostaticcoolpressing to make large-size (more than 2kg) thorium-tungsten blank bars. Presintering is performed in an atmosphere of hydrogen at 1,200 to 1,540 DEG C, the high-temperature sintering process is regulated, and three important thermal-insulation areas are adopted; therefore, the grain uniformity of the large-size thorium-tungsten blank bars is ensured, the manufacturing cost is reduced and production efficiency is improved.

Description

technical field [0001] The invention relates to a method for manufacturing a large-size thoriated tungsten billet, which belongs to the field of powder metallurgy manufacturing. Background technique [0002] The existing method for manufacturing tungsten billet is: disposing tungsten powder, pressing, pre-sintering and double vertical melting of tungsten billet. Using this process or other processes, the current weight of a single tungsten rod at home and abroad is 0.8-1.5kg. However, in the current situation where global resources and energy are increasingly tense, the industrial production of billets is no longer suitable for the requirements of the low-carbon era. However, during the preparation and sintering of large-sized thoriated tungsten billets, it is easy to cause the problem of sporadic large crystals in the center of the thoriated tungsten billet and the problem of ThO 2 Hidden danger of high temperature burning, it is difficult to guarantee ThO 2 The particle...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F3/16
Inventor 王竹青方毅金梁树荣
Owner XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD