Sintering Al-AlN compacts in nitrogen atmosphere. How will i prevent swelling?

Evarastics Polycarp @Evarastics-Polycarp

22 March 2017 1 5K Report

1. Mixed powder consists of Al , AlN and sometime +Mg as a wetting agent.

2. Sintering temperature ranging from 550 0C for 2hrs to 650 0C for 1hour in nitrogen atmosphere

3. Results: swelling of sintered compacts instead of shrinkage

Suggest how to prevent this swelling.

Xu Wang

Did Mg make the swelling any better?

Most of the swelling is related to poor wet of liquid on particles, pushing particles away.

Here you have alumina layer and AlN formation affecting the wet.

How about try solid phase sintering and/or pressure sintering?

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