scholarly journals The Analysis of Resistance to Brittle Cracking of Tungsten Doped TiB2 Coatings Obtained by Magnetron Sputtering

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 807
Author(s):  
Jerzy Smolik ◽  
Joanna Kacprzyńska-Gołacka ◽  
Sylwia Sowa ◽  
Artur Piasek
Keyword(s):  
Fracture Toughness ◽  
Magnetron Sputtering ◽  
Composite Structure ◽  
Columnar Structure ◽  
Mode I ◽  
Nano Composite ◽  
Tungsten Concentration ◽  
Tib2 Coating ◽  
Crack Length Measurement

In this work, the authors present the possibility of characterization of the fracture toughness in mode I (KIC) for TiB2 and TiB2 coatings doped with different concentration of W (3%, 6% and 10%). The Young’s modulus, hardness and fracture toughness of this coatings are extracted from nanoindentation experiments. The fracture toughness was evaluated using calculation of crack length measurement. An important observation is that increasing tungsten concentration in the range 0–10% changes the microstructure of the investigated coatings: from columnar structure for TiB2 coating to nano-composite structure for Ti-B-W (10%) coating. It can be concluded that doping with concentration 10 at.% W causes an increase of the fracture toughness for the tested coatings.

Mode I Fracture Toughness Characterization of a Resistance Welded Carbon / PPS Laminate

2010 ◽  
Author(s):  
Nilson E. Narita ◽  
Luciana S. Marques ◽  
Gustavo G. da Costa ◽  
Sergio Frascino M. de Almeida
Keyword(s):  
Fracture Toughness ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness

scholarly journals Multi-parametric characterization of mode I fracture toughness of asphalt concrete: Influence of void and RA contents, binder and aggregate types

2018 ◽  
Vol 11 (3) ◽  
pp. 274-284 ◽  
Author(s):  
Saannibe Ciryle Somé ◽  
Montassar Abdhelack Fredj ◽  
Mai-Lan Nguyen ◽  
Arnaud Feeser ◽  
Alexandre Pavoine
Keyword(s):  
Fracture Toughness ◽  
Asphalt Concrete ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness

Synthesis and Characterization of Quaternary Ti-Si-C-N Film Deposited by Middle Frequency Magnetron Sputtering

2012 ◽  
Vol 581-582 ◽  
pp. 540-543
Author(s):  
Jin Long Jiang ◽  
Di Chen ◽  
Wei Jun Zhu
Keyword(s):  
Magnetron Sputtering ◽  
Elastic Recovery ◽  
Amorphous Structure ◽  
Columnar Structure ◽  
Maximum Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Large Particles ◽  
Si Wafer

Quaternary Ti-Si-C-N films were deposited Si wafer by middle frequency magnetron sputtering Ti80Si20 twin-targets in mixture atmosphere of Ar, CH4 and N2. Scanning electron microscopy (SEM) and x-ray diffraction (XRD) results indicate that the films present an amorphous structure with no columnar structure. These films are quite uniform and dense without large particles. The film deposited at 10 sccm CH4 and 10 sccm N2 flow rates exhibits a maximum hardness of 18.9 GPa and high elastic recovery of 97%.

Fracture toughness (Mode I) characterization of SiO 2 nanoparticle filled basalt/epoxy filament wound composite ring with split-disk test method

2017 ◽  
Vol 119 ◽  
pp. 114-124 ◽  
Author(s):  
Mehmet Turan Demirci ◽  
Necmettin Tarakçıoğlu ◽  
Ahmet Avcı ◽  
Ahmet Akdemir ◽  
İbrahim Demirci
Keyword(s):  
Fracture Toughness ◽  
Test Method ◽  
Mode I ◽  
Composite Ring ◽  
Filament Wound ◽  
Filament Wound Composite ◽  
Wound Composite ◽  
Disk Test

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

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