TY - JOUR
T1 - Nanocomposites nc-TiN/a-Si3N4/a- and nc-TiSi2 with hardness exceeding 100 GPa and high fracture toughness
AU - Veprek, S.
AU - Niederhofer, A.
AU - Moto, Keba
AU - Nesladek, P.
AU - Mannling, H.
AU - Bolom, T.
PY - 2000
Y1 - 2000
N2 - In course of further development of our generic concept for the design of novel superhard nanocomposites we have recently developed new multi-phase ultrahard nanocomposite coatings with Vickers microhardness of 80 to 105 GPa which is in the range of natural diamond. The coatings show a high elastic recovery of up to 90% upon a relatively large indentation deformation. The hardness measured by the depth sensing technique agree with those calculated from the area of the remaining pseudoplastic deformation. The very high apparent fracture toughness is illustrated by the absence of any radial cracks upon indentation with a large load of 1 N into 10.3 μm thick film. The unusual combination of high hardness, elastic recovery and apparent fracture toughness was attributed to the ample possibility of cracks deflection, meandering and termination during loading and cracks closure upon unloading. The suggested nanostructure of the coatings has been elucidated on a basis of a complex analysis by means XRD, EDX, ERD, XPS and HR TEM.
AB - In course of further development of our generic concept for the design of novel superhard nanocomposites we have recently developed new multi-phase ultrahard nanocomposite coatings with Vickers microhardness of 80 to 105 GPa which is in the range of natural diamond. The coatings show a high elastic recovery of up to 90% upon a relatively large indentation deformation. The hardness measured by the depth sensing technique agree with those calculated from the area of the remaining pseudoplastic deformation. The very high apparent fracture toughness is illustrated by the absence of any radial cracks upon indentation with a large load of 1 N into 10.3 μm thick film. The unusual combination of high hardness, elastic recovery and apparent fracture toughness was attributed to the ample possibility of cracks deflection, meandering and termination during loading and cracks closure upon unloading. The suggested nanostructure of the coatings has been elucidated on a basis of a complex analysis by means XRD, EDX, ERD, XPS and HR TEM.
UR - http://www.scopus.com/inward/record.url?scp=0033702843&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:0033702843
SN - 0272-9172
VL - 581
SP - 321
EP - 326
JO - Materials Research Society Symposium - Proceedings
JF - Materials Research Society Symposium - Proceedings
T2 - The 1999 MRS Fall Meeting - Symposium F 'Nanophase and Nanocomposite Materials III'
Y2 - 29 November 1999 through 2 December 1999
ER -