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New Refractory Metals and Hard Materials Findings from Jagiellonian University Described (Oxidation, graphitization and thermal resistance of PCD...

July 25, 2014



New Refractory Metals and Hard Materials Findings from Jagiellonian University Described (Oxidation, graphitization and thermal resistance of PCD materials with the various bonding phases of up to 800 degrees C)

By a News Reporter-Staff News Editor at Mining & Minerals -- A new study on Refractory Metals and Hard Materials is now available. According to news originating from Krakow, Poland, by VerticalNews correspondents, research stated, "Three types of polycrystalline diamond composites (PCDs) were studied. The first material was sintered using the mixture containing 80 wt.% diamond, 15 wt.% of Ti-Si-C powder (mixture of 47.1 wt.% Ti3SiC2 and TiSi2, TiC and SiC, from self-propagating high-temperature synthesis) and 5 wt.% nanometric Ti(CN) powders."

Our news journalists obtained a quote from the research from Jagiellonian University, "The second material was prepared using diamond powder and 10 wt.% of titanium diboride. Materials were sintered using a Bridgman-type high-pressure apparatus at 8 GPa and at the temperature of 2000 degrees C. The third material was a commercial PCD containing 88 wt.% of diamond, 10 wt.% of Co and 2 wt.% of WC. The coefficients of friction for diamond composites in a sliding contact with an Al2O3 ceramic ball were determined from room temperature of up to 800 degrees C, in air. X-ray diffraction patterns of diamond composites after HP-HT sintering and wear tests are presented. In the studies, due to the use of Raman spectroscopy the strong influence of the bonding phase on the oxidation of diamond composites was confirmed. The most thermally stable material is the diamond composite with TiB2."

According to the news editors, the research concluded: "High temperature bonding phase for diamond composites guarantees higher hardness and low coefficient of friction at elevated temperatures."

For more information on this research see: Oxidation, graphitization and thermal resistance of PCD materials with the various bonding phases of up to 800 degrees C. International Journal of Refractory Metals & Hard Materials, 2014;45():109-116. International Journal of Refractory Metals & Hard Materials can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; International Journal of Refractory Metals & Hard Materials - www.elsevier.com/wps/product/cws_home/405934)

The news correspondents report that additional information may be obtained from L. Jaworska, Jagiellonian University, Fac Chem, PL-30060 Krakow, Poland. Additional authors for this research include M. Szutkowska, P. Klimczyk, M. Sitarz, M. Bucko, P. Rutkowski, P. Figiel and J. Lojewska.

Keywords for this news article include: Krakow, Poland, Europe, Refractory Metals and Hard Materials

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Source: Mining & Minerals


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