01 January 2018 2 5K Report

What is the ignition (minimum required) temperature for the direct synthesis of Vanadium Carbide (VC) using Vanadium and Carbon (Graphite) elements?

More Mehdi Shahedi Asl's questions See All
What is the melting point of Al4Si?

The formation of Al4Si intermetallic phase was detected by XRD analysis due to the addition of Al as a sintering aid in an ultrahigh temperature ceramic composite. I want to know the melting...

09 October 2018 7,094 6 View

Does anyone know about the coefficients of thermal expansion of HCP single crystal ceramics?

Is there any reference for the coefficients of thermal expansion of hexagonal single crystals? Especially, I need to know the probable differences between the coefficients at different directions...

02 March 2015 7,585 3 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...

02 March 2015 8,052 7 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...

02 March 2015 1,469 10 View

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?

02 March 2015 4,612 12 View

How to measure the stoichiometric variations during sintering?

What is the easiest way to check the stoichiometric variations during the sintering process of ultrahigh temperature ceramics such as ZrB2 or TiB2? How to recognize the final composition of the...

10 November 2014 7,894 0 View

How can I use micro-hardness (Indentation) method to study the kinetics of ceramic matrix composites?

Do you have any references about this topic? I am working on UHTCs (e.g. ZrB2-SiC composites)

08 September 2014 1,571 1 View

Open pores vs. Closed pores?

I have prepared some UHTCs through hot pressing at 1700, 1850 and 2000 °C. Open pores were dominant type of porosity in the samples hot pressed at 1700 °C, but the type changes completely to...

01 February 2014 4,474 5 View

Is it possible to use "Direct Crack Measurement" method for determination of fracture toughness in ceramics that have 25% porosity?

Because of many porosities in the polished surface of a ceramic composite, I'm not able to detect the cracks induced by vickers indenter. Does the Direct Crack Measurement method only work for...

31 December 2013 2,128 3 View

How can I thermally etch a polished surface of an ultrahigh temperature ceramic composite?

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...

11 December 2013 7,170 15 View

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