I make polycrystalline diamond with tape casting followed by HPHT sintering. When i sintered the samples up till May, the sintering was good. When i sintered the samples in June and July at the same conditions, the sintering was not good. I used the same slurry making conditions, tape casting conditions, debinding conditions, heat treatment conditions, and sintering conditions.
The only changed parameter i can think of may be humidity, as humidity is very high in June, July and August in Korea.
What tests should i perform and at what stages? How to overcome this issue?
Thank you.
Thank you so much Mr. Tobias Makuochukwu Onyia for your time and very detailed response to my query.
Muhammad Waqas Khalid In fact a very detailed response by Tobias Makuochukwu Onyia generated by ChatGPT ;)
I am wondering if the water content of pyrophyllite and the oxidation of cemented carbide have changed leading to the bad sintering. The sintering of PDC without tape casting may help you exclude that.
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