7 Questions 35 Answers 0 Followers
Questions related from Mehdi Shahedi Asl
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 7,451 12 View
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 2,867 6 View
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 8,197 9 View
I have used β-SiAlON as an additive in a ceramic matrix composite. The powder mixture was sintered at 1900 C for 2 h. I want to know what the destiny of the β-SiAlON is? Does it melt? Is it...
09 December 2014 1,129 6 View
What is the best and easiest method for thermally etching of UHTCs? I want to analyze the microstructure, calculate the grain size, and investigate the grain boundaries of a polished sample. Is...
27 December 2013 9,021 14 View
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 2,242 6 View
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 727 8 View
