Muhammad Waqas Khalid

10 Questions 16 Answers 0 Followers

Questions related from Muhammad Waqas Khalid

What could be the possible reason that sintering of polycrystalline diamond fabricated with tape casting has suddenly started failing?

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...

17 July 2024 3,180 5 View

What may cause whitish discolor of polycrystalline diamond surface, and cracks near edge?

I am preparing polycrystalline diamond (PCD) with tape casting. The powder is 8~12 um. After drying of tapes, I place several tapes in Ta cup without warm-pressing. Next, debinding is carried...

24 June 2024 7,714 2 View

How to melt PEG-100 solid that is not in granules or flakes form, and looks like the solid as in the picture attached?

I usually use PEG-200 and PEG-300 that are in liquid form. Recently I received PEG-100 from a company that usually do not make PEG-100, and made it once specially for us. It is not in liquid...

13 March 2024 1,786 5 View

What viscosity Methyl cellulose binder is used for tape casting of 10 um powder particles? What are general recommendations for such sized particles?

I am using 4000 cP methyl cellulose for aqueous tape casting. Since it gives very viscous solution, I am dissolving it in 1.5 wt% in 98.5 wt% DI water. Still it is a very viscous solution. Because...

18 October 2023 1,894 2 View

How much Alumina and PVA binder should be used in aqueous tape casting of fine alumina (500 nm)?

I want to make slurry for aqueous tape casting of alumina (500 nm avg. particle size) using PVA binder and PEG plasticizer, but I am not being able to optimize the contents. 1. In what quantity...

26 April 2021 832 4 View

Is line-intercept method using ImageJ correct way to find grain size from microstructure of a "porous" sample?

Usually I measure grain size of my dense ceramic samples from SEM microstructures using ImageJ by line-intercept method. But now I have a range of samples with 90 to 94% density. The SEM images...

14 October 2020 5,537 4 View

What mold releasing agent is recommended for slip casting of alumina slurry using gypsum mold?

Can you please tell what releasing agent should i use for gypsum mold for slip casting, and how to use?

25 August 2020 2,419 9 View

Are simple geometric cheap plaster of paris molds commercially available for academic slip casting purpose? Can a mold be reused several times?

I have recently started working on slip casting. I couldn't find the plaster of paris molds in the market where I could search for laboratory scale slip casting. Plus I have read in papers they...

25 March 2020 2,401 3 View

In sintering kinetics of a powder compact, should i use shrinkage as dL/Lo (unitless), or should i calculate its percentage, and how?

In papers, shrinkage during sintering is mentioned in percentage. What is the reason for it, and how to calculate the percentage? And please also tell how to calculate activation energy of...

12 December 2018 9,737 3 View

Does anyone have pdf of ASTM C1161-18 standard for flexural strength of ceramics at ambient temperature?

If you have, please send me at [email protected] Thank you.

12 September 2018 8,508 1 View