Sintering Process of Nanosized Tungsten Powder
- Details
- Category: Tungsten Information
- Published on Wednesday, 27 May 2015 19:14
Nanosized tungsten powder with a particle size of 60 nm was used as raw material, which was prepared by catalysis-gel process. By means of compacting with a steel die, the green compact was sintered in hydrogen so as to look into its shrinkage kinetic curve. By these methods the changes of grain size and relative density during sintering at different temperatures and different sintering time were tested. Now we could clearly see that the compact of nanosized tungsten powder begins to shrink at the temperature of 200 ℃ and stops shrinking at 1 300 ℃.And we can also se that the highest shrinkage rate comes out at 1 225 ℃. From 1 000 ℃ to 1 200 ℃, the relative density increases by 24%. After sintered at 1 200 ℃ for 120 min, the average grain size is 5 μm, and the relative density is 95% at the same time.
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