Papers by Author: Irina Hussainova

Abstract: The main goal of present work was to study room temperature wear behaviour of advanced cermet particle reinforced hardfacings. For this purpose three different recycled powders: WC-Co, TiC-NiMo and Cr3C2-Ni were used as reinforcements for the commercially used NiCrBSi matrix alloy. Plasma transferred arc hardfacing process was used for deposition of the hardfacings. Manufactured hardfacings show only average wear resistance compared to WC/W2C reinforced NiCrBSi hardfacing with two times higher wear values. However, in combined impact/abrasive and erosive contacts, manufactured hard particle reinforced hardfacings have shown very promising results with high wear resistance. It was shown, that double structuring along with right material constituent and coating procedure selection may provide high wear resistance.

Abstract: Microstructure analysis and mechanical characterization were performed on newly developed WC based and yttria stabilized tetragonal zirconia (ZrO2) doped cermets with nickel metal binder produced by hot isostatic pressing. The cermets have reached higher than 99% of theoretical density after processing at 1700 0C and 206 MPa for 1 hour. Zirconia has appeared to form agglomerates of about 1 µm and suppressed carbide grains growth. Hardness of zirconia doped materials was of the same magnitude and fracture toughness was slightly higher as compared to conventionally produced WC-Co hardmetals of the same metal binder content while wear resistance in conditions of erosion and abrasion in silica media is increased by two fold.

Abstract: The properties, performance, and reliability of a cermet material depend mostly on the intrinsic properties influenced by microstructure that evolves during processing and use. In this study, the effect of microstructure on reliability of multiphase materials in erosive media is analyzed with reference to WC-, TiC-, and Cr3C2 - based ceramic-metal composites. Microstructure of multiphase materials, fracture mechanisms, ability of energy dissipation, thermo-mechanical parameters and erosion resistance are examined. It has been shown that microstructural variables play a very important role in cermets performance. The energetic criterion of non-homogeneous materials selection has been presented.

Abstract: Solid particle erosion tests were conducted on WC-, TiC-, and Cr3C2 - based ceramicmetal composites (cermets) to study their performance in erosive media. The overall objectives of this study are: (i) to improve our current understanding with regards to the influence of intrinsic properties on wear behavior of cermets, (ii) to estimate an influence of metallurgical features during cermets fabrication on resistance to fracture; (iii) to consider micromechanical aspects of cermets durability; and (iiii) to offer the criteria of material reliability in different erosive conditions. For this reasons, microstructure of multiphase materials, fracture mechanisms, ability of energy dissipation and thermo-mechanical parameters and erosion resistance were analyzed.