Authors:
Jazmina Navarrete Cuadrado (CEIT-BRTA, Spain),
Tomas Soria Biurrun (CEIT-BRTA, Spain),
Steven Moseley (Hilti Corporation, Liechtenstein),
Nerea Gonzalez Polvorosa (Hilti Corporation, Liechtenstein),
Jose M. Tarragó (Hilti Corporation, Liechtenstein),
Jose M. Sanchez-Moreno (CEIT-BRTA, Spain)
Abstract:
Tungsten borides are potential candidates for the fabrication of tool materials. Among them, tungsten tetraboride is attracting increasing attention due to its very high hardness (» 47 GPa), good electrical conductivity and abrasion and corrosion resistance. Nevertheless, the technologies needed to obtain WB4 based usable tools are still to be developed. In this work, full densification of WB4 based hard materials has been achieved by applying glass encapsulated HIP cycles to powders mixtures with different W|B ratios and Ta additions. Contrary to that reported by other authors, it has been confirmed that Ta addition enhance the transformation of tungsten tetraboride (WB4) into tungsten diboride (WB2). Processing parameters have been tailored for retaining the hard WB4 hexagonal phase after sintering reaching hardness values over 26 GPa (HV5). Interaction between WB4 and different metals has been investigated in order to find suitable binder phases for producing tougher WB4-metal cermets.
DOI:
https://doi.org/10.59499/WP225371740