Mehdi Shahedi Asl

5 Questions 28 Answers 0 Followers

Questions related from Mehdi Shahedi Asl

What is the nature of chemical bonding of ZrB2?

I need the exact nature of chemical bonding of ZrB2. I think it is mainly covalent, however, is there any reference or an exact database about he percentage of covalent or ionic bondings?

29 March 2015 7,378 12 View

What is the mechanism of thermal etching in ceramics?

I have used the thermal etching method (vacuum atmosphere) for detection of grain boundaries. I would like to know which mechanisms or phenomena can lead to the appearance of grain boundaries? Do...

29 March 2015 2,808 6 View

Can the mismatch in the coefficients of thermal expansion lead to the formation of stress during the sintering?

Can the mismatch in the coefficients of thermal expansion at "a" and "c" directions of a hexagonal structure lead to the formation of stresses at the grain boundaries of poly-crystal ceramics...

29 March 2015 8,143 9 View

What is the best method for detection of impurities in very pure ceramic powders?

I have purchased some ceramic powders (e.g. SiC, BN). The dealer claims that the purity is more than 99 percent. How can I detect and characterize the type of impurities (less than 1 percent) in...

19 November 2013 2,186 6 View

Solution to the journal's disregard for the submitted manuscript

I had submitted a manuscript to the Canadian Metallurgical Quarterly on Aug 25, 2019. A year later, its status is still "with editor" !!! I have sent several emails to the journal that either...

01 January 1970 667 8 View