Low temp. ZrC produced 1st time in Iran

News ID: 2790677 -
ISFAHAN, Jun. 30 (MNA) – Scientists in Najafabad of Isfahan managed to produce Zirconium carbide powder in low-heat for the first time in the world.

Iran Nano-technology Initiative Council (INTIC) reported a breakthrough achieved in Islamic Azad University branch of Najafabad in Isfahan Province to find a synthesizing method of Nanostructured Zirconium carbide powder which does not necessitate the traditional high-temperature process and accordingly reduces the costs on the way getting Zirconium carbide (ZrC) and improves the anti-corrosive quality of the final material.

An extremely hard refractory ceramic material, Zirconium carbide is made by carbo-thermal reduction of zirconia by graphite. Densified ZrC is made by sintering powder of ZrC at upwards of 2000 °C. Hot pressing of ZrC can bring down the sintering temperature consequently helps in producing fine grained fully densified ZrC. Spark plasma sintering also has been used to produce fully densified ZrC.

Poor oxidation resistance over 800°C limits the applications of ZrC. One way to improve the oxidation resistance of ZrC is to make composites. Important composites proposed are ZrC-ZrB2 and ZrC-ZrB2-SiC composite. These composites can work up to 1800°C.s

Dr. S.A. Hassanzadeh-Tabrizi, and Dr. Amir Hossein Emami are the two university professors who along with two researchers Saman Salahshour and Danial Davoodi, collaborated to garner the accomplishment.

The synthesized powders were studied by X-ray diffraction (XRD), differential thermal analysis (DTA), field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). Zirconium carbide (ZrC) was produced after 30h milling. Thermodynamic calculation showed the reaction to be a mechanically induced self-sustaining one (MSR). DTA analysis indicated that the temperature of exothermic reaction decreases significantly after 12 h milling.

The result of their scientific efforts on this project has formed a paper published in Ceramics International journal of August 2015, Pages 8397–8401.

 

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