Sami Tehrani

8 Questions 5 Answers 0 Followers

Questions related from Sami Tehrani

Are there any disadvantages for using reciprocating wear test in high speed?

Please could someone advise if there are any disadvantages while using reciprocating wear test at high speed around 10 HZ in terms of COF. Is there any possibility that the system cannot read the...

12 December 2016 996 9 View

How can I interpret the Raman spectra of alumina and 3Y-TZP?

I have a Raman Spectra of Alumina and 3Y-TZP sintered around 1500 C. The Raman Spectra is showing few small peaks above 1000 cm-1 and one peak around 1650 cm-1. As most literature does not...

11 November 2016 5,523 2 View

Could someone please suggest what type of stabilization ( Steric, electrostatic or Electrosteric) in Zirconia and alumina composite happens ?

Could someone please suggest what type of stabilization ( Steric, electrostatic or Electrosteric) in Zirconia and alumina composite happens while citric acid is used as dispersant and the...

05 May 2016 3,506 0 View

Please could someone suggest why the samples which have been processed in exactly the same way obtain different colour after sintering by SPS?

Please could someone suggest what are the possible reasons that the samples (Alumina and zirconia) which have been processed in exactly the same way ( Ceramics Processing and also the same recipe...

01 January 2016 6,397 7 View

Does anyone know why the surface of SPSed (Spark Plasma Sintering) Samples are rougher than pressureless sintered Samples?

Please could you help me to understand about main reasons that make surface of Spsed samples rougher than pressureless samples?

11 November 2015 818 5 View

The shrinkage rate Vs temperature graph shows two peaks at different temp. Would it cause a problem for sintering and densifying processes?

I have two different phases in my composite which are Alumina and Zirconia. The shrinkage rate Vs temperature graph shows two peaks at different temperature. I am not sure if two different max...

04 April 2015 4,966 4 View

Has anyone ever had the experience of having bumpy surface after making a zirconia /Alumina sample by SPS followed by thermal etch?

After making composite out of zirconia and alumina by SPS followed by grinding, polishing and thermal etch, my samples get bumps over surface. I'm not sure about the possible reasons. Please see...

03 March 2015 7,678 5 View

Why do researchers mix strontium carbonate with Alumina to form strontium hexaluminate rather than directly mixing strontium oxide and alumina?

I see in publications that people don't directly use strontium oxide to react with Alumina and instead they use other derivatives of Strontium such as Strontium carbonate to form strontium...

03 March 2015 3,073 4 View