Nanocrystalline tungsten carbide: As incompressible as diamond

Zhijun Lin; Lin Wang; Jianzhong Zhang; Ho-kwang Mao; Yusheng Zhao
November 2009
Applied Physics Letters;11/23/2009, Vol. 95 Issue 21, p211906
Academic Journal
We investigate the compressibility of nanocrystalline tungsten carbide (nano-WC) using synchrotron x-ray diffraction. Nano-WC displays a bulk modulus (452 GPa) comparable to that of diamond; it is 10%–15% larger than previously reported values for bulk WC. This finding is consistent with a generalized model of nanocrystal with a compressed surface layer. The linear bulk moduli of nano-WC along a- and c-axes were determined to be 407 and 546 GPa, respectively. First-principles density functional theory (DFT) calculations confirm the experimental observations of an anisotropic linear compressibility and a lower bulk modulus for microsized WC.


Related Articles

  • Hard alloys WC-Co (6 wt %) and WC-Co (10 wt %) based on nanocrystalline powders. Kurlov, A. S.; Rempel', A. A.; Blagoveshenskii, Yu. V.; Samokhin, A. V.; Tsvetkov, Yu. V. // Doklady Chemistry;Jul2011, Vol. 439 Issue 1, p213 

    The article presents a study which synthesizes hard alloys in the tungsten carbide (WC)-cobalt (Co) system, as well as to describe the technological issues in the use of traditional sintering and the features of hard alloys created from nanocrystalline WC-Co powder mixtures. The study used...

  • Surface Coating of Tungsten Carbide by Electric Exploding of Contact. Grigoryev, Evgeny G. // AIP Conference Proceedings;1/17/2011, Vol. 1315 Issue 1, p1395 

    Electric exploding of a tungsten carbide-cobalt material near-by high-speed steel surface forms on it a hardening coating. The essential structure properties of the formed coatings are determined by parameters of contact exploding electrode at the pulse current amplitude from above 106 A/cm2 and...

  • Selecting the Correct Braze Alloy. Walz, Thomas J. // Penton's Welding Magazine;Apr2007, Vol. 80 Issue 4, p30 

    The article discusses how to select the right braze alloy in welding. According to the author, there are basically four kinds of alloys used in brazing tungsten carbide. The use of a 50 percent cadmium-free alloy is being replaced by High Impact braze alloy. The standard braze alloy used for...

  • Dynamic Torsion Testing of Nanocrystalline Coatings Using High-Speed Photography and Digital Image Correlation. Francois Barthelat; Z Wu; Barton C Prorok; Horacio Dante Espinosa // Experimental Mechanics;Sep2003, Vol. 43 Issue 3, p331 

    The strength and ductility of microcrystalline and nanocrystalline tungstsen carbide-cobalt (WC-Co) cermets have been evaluated by employing a stored energy Kolsky bar apparatus, high-speed photography and digital image correlation. The test specimens were thin-walled tubular Al7075-T6...

  • HVOF Thermal Spray Technology. Thorpe, Richard; Kopech, Howard; Gagne, Noel // Advanced Materials & Processes;Apr2000, Vol. 157 Issue 4, p27 

    Deals with materials that may be sprayed with high-velocity oxygen fuel (HVOF) process. How metal powders and HVOF equipment can be improved; Tungsten carbide-cobalt compositions applied by HVOF to prevent wear; Materials available for HVOF in addition to tungsten carbide; Powder modification...

  • BEST PAPER AWARD.  // International Journal of Powder Metallurgy;Fall2014, Vol. 50 Issue 4, p33 

    The article focuses on a study that investigated the fracture and fatigue behavior of tungsten carbide-cobalt (WC-cobalt) alloy.

  • Enhancement in the microhardness of arc plasma melted tungsten carbide. Nayak, B. B. // Journal of Materials Science;Jun2003, Vol. 38 Issue 12, p2717 

    Microhardness is found to increase significantly in arc plasma melted tungsten carbide. To understand the mechanism for such increase, tungsten carbide powder was mixed with tungsten metal powder to prepare mixtures of seven different compositions. The mixtures with varying WC/W ratio were...

  • Stressing out over tungsten-carbide failure. Powell, Robed // American Machinist;Sep2000, Vol. 144 Issue 9, p84 

    Focuses on the popularity of tungsten carbide as material of choice for manufacturing tools, dies and wear parts because of their resistance to wear, shock, corrosion and abrasion. Difficulty of matching the proper grade of tungsten carbide to a particular application; Circumstances that can...

  • Physicochemical properties of electrodeposits based on tungsten carbide and zirconium diboride on steels. Malyshev, V. V.; Gab, A. I. // Protection of Metals;Feb2007, Vol. 43 Issue 1, p45 

    The electrodeposition of coatings based on tungsten carbide and zirconium diboride on steel materials and their physicochemical and mechanical properties are studied. The coatings enhance the wear resistance of steel samples by a factor of 6–11 and the abrasive stability by a factor of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics