Optical (a) and SEM images (b–d) showing tensile cracking of alumina scale on the Kanthal A-1 alloy after 70 h cyclic oxidation at 1200°C with cooling at 10°C/min. Partial spalling of the oxide, visible on (b) and (c), occurs at room temperature. All cracks form deep grooves on the oxide
A study is made of the cracking and interfacial adhesion characteristics of atomic layer deposited alumina films on as-received and water–plasma-treated polycarbonate using tensile testing. Optical microscopy was used to observe the initial cracking and subsequent evolution of multiple cracks and film delamination from the substrate during
Abstract. Alumina ceramic powders have high melting point and are prone to cracking during the rapid heating and cooling process of selective laser melting (SLM). Research on the crack formation and growth mechanisms forms the basis to developing crack suppression techniques. Variable laser power experiments based on single-track, zigzag, and
tensile cracking experiments, the effect of increasing anodize thickness has been examined. Scanning electron microscopy has also been used to relate the measured strengths to the cracking patterns observed at the failure surfaces. Through the fatigue experiments, it was found that the thinnest anodize coatings yielded the highest fatigue
2.4. Tensile stresses and cracking might develop in MLCCs after soldering themto alumina boards, which is due to the differences in CTEs between the ceramic material and substrate, with the latter having lower CTEs. These stresses were responsible for many observed failures in the first ceramic chip capacitors mounted
Tensile testing was performed using a hydraulic universal testing machine (Instron 8400) with a capacity of 500 kN. As shown in Fig. 3, a separate test device was designed.Given that the porcelain insulator comprises components that are continuously connected, the grip devices were designed to simulate the actual cap and pin components, to constrain the insulators and thus produce the same
Fiber tensile test results indicated that the tensile strength of quartz fibers with alumina–silica/α-Al 2 O 3 coatings was about 3.7 times (22.78 MPa) that of the original quartz fibers. Compared with the original quartz fibers, the surface of the alumina–silica/α-Al 2 O 3 -coated quartz fibers sintered at 1150 °C for 4 h showed no
Various processing parameters leading to edge cracking in hot-rolled coils are described, along with a study of the effect of these parameters on the occurrence of edge cracking during commercial production of semi-killed hot-rolled coils. High-temperature tensile testing revealed that ductility decreased with a decrease in test temperature from 850 to 750 °C and improved with a further drop
In summary, the factors that affect cracking ofthe anodized coatings are asfollows: • Temperature: Temperature is the most important factor for cracking of anodized coating• The tensile stress in the coating is proportional to the temperature change [6]. Both hot-water sealing and thermal cycling may cause the formation and propagation of
Load relaxation and cross-head displacement rate-change experiments have been used to establish log10 stress intensity factor (K) versus log10 crack velocity (v) diagrams for double torsion specimens, of synthetic quartz cracked on thea plane in liquid water and moist air.For crack propagation normal toz and normal tor at 20°C,K Ic (the critical stress intensity factor) was found to be 0.852
2.4. Tensile stresses and cracking might develop in MLCCs after soldering themto alumina boards, which is due to the differences in CTEs between the ceramic material and substrate, with the latter having lower CTEs. These stresses were responsible for many observed failures in the first ceramic chip capacitors mounted
coatings and alumina barrier coatings sputtered onto high temperature aromatic polyesters. The onset strain for tensile failure and related cohesive strength of the coatings, and their adhesion to the polymer substrate, are analyzed by means of bending tests and fragmentation tests. The former test enables accurate electrical
A tensile stress can cause preexisting flaws to extend across the layer and into the adjacent layers and then tunnel until they meet either another crack or a free surface. A previous analysis has shown that for a given residual stress there is a critical layer thickness, below which no tunnel cracks will exist, regardless of initial flaw
OSTI.GOV Journal Article: Cracking of laminates subjected to biaxial tensile stresses Title: Cracking of laminates subjected to biaxial tensile stresses Full
Coking is the process of carbon deposition from a gas phase that is encountered in many reforming, cracking and other high temperature processes. Coking in certain petrochemical processes can lead to carbon build up causing reduced process efficiency, corrosive attack and degradation of the alloy. Steam cracking of hydrocarbons is one of the most important process for manufacturing many base
CRACKING OF LAMINATES SUBJECTED TO BIAXIAL TENSILE STRAINS C. Hillman, Z. Suo, and F. F. Lange Materials Department University of California, Santa Barbara Santa Barbara, CA 93106 Journal of American Ceramic Society 79, 2127-2403 (1996) Abstract During the processing of laminar ceramic, biaxial, residual stresses can arise due to differential thermal contraction between unlike
Coil Spring Manufacturing Process. Whether you have an exist ing spring application in need of re-engineering or a new one that requires design in g this guide will help. The engineering team and Duer Carolina Coil has been manufacturing springs for well over 100 years and has refined the coil spring manufacturing process for the industry – for all types of coil
Bauxite is a naturally occurring, heterogeneous material composed primarily of one or more aluminum hydroxide minerals, plus various mixtures of silica, iron oxide, titania, aluminosilicate, and other impurities in minor or trace amounts. The principal aluminum hydroxide minerals found in varying proportions with bauxites are gibbsite and the polymorphs boehmite and
This study has used thermogravimetric, acoustic emission and finite-element modelling techniques to examine the tensile cracking of a chromia layer on a 20Cr25Ni steel during thermal cycling from
This study investigates the effect of alumina nanoparticles (ANPs) on tension and fracture characteristics of polymer concrete (PC). ANPs with a maximum particle size of 50 nm were used at 0.5, 1.0, 2.0, and 3.0 wt.% of epoxy resin. Tensile
Pure aluminium reinforced with 44 vol.% alumina particles, tested in tension and unloaded at periodic plastic deformations, is analysed by neutron diffraction during each reloading elastic step, at 30%, 50%, 70% and 90% of the tensile flow
Spalling and Cracking in Alumina by Compression Spalling and Cracking in Alumina by Compression ADAMS, MARC; SINES, GEORGE 00:00:00 Crack damage produced by compressive loads in a dense alumina ceramic was studied with a replication technique that recorded damage done to the specimen\'s surface. The characteristics of the spalling produced in an externally
cracking” problems. This paper describes real behavior of deformation at temperature cycling and PCB bending of chip components (body size 0603). By using piezoresistive effect in thick film resistors effects of stress on alumina body can be determined and described for whole temperature range of interest.
corrosion cracking of in service component has long been responsible for major safety concerns, waste in production time, and cost in the maintenance of the material in some of major industries, such as the chloride in marine application and caustic SCC in alumina processing and pulp industries[2-5]. The stresses can be the result of the
The cracking processes during the indentation test of brittle solids is simulated by means of the finite element method (FEM) using elements exhibiting cohesive post-failure behaviour and alumina
Both boehmite and alumina plaets increased the tensile modulus, yield stress and fracture toughness of the epoxy composite by up to 40%, 35% and 320%,
Dynamic fragmentation of an alumina ceramic subjected to shockless spalling: An experimental and numerical study J.L. Zinsznera, B. Erzarb, P. Forquina,n, E. Buzaudb a Laboratoire Sols Solides Structures-Risques (3SR), Université Grenoble Alpes, BP 53, 38041 Grenoble Cedex 9, France b CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France article info Article
Coil Spring Manufacturing Process. Whether you have an exist ing spring application in need of re-engineering or a new one that requires design in g this guide will help. The engineering team and Duer Carolina Coil has been manufacturing springs for well over 100 years and has refined the coil spring manufacturing process for the industry – for all types of coil
INDUSTRIAL EXPERIENCE ON THE CAUSTIC CRACKING OF STAINLESS STEELS AND NICKEL ALLOYS - A REVIEW Raúl B. Rebak Lawrence Livermore National Laboratory, Livermore, CA, 94550 ABSTRACT Caustic environments are present in several industrie s, from nuclear power generation to the fabrication of alkalis and
State-of-the-art of Coke Formation during Steam Cracking: Anti-Coking Surface Technologies Steffen H. Symoens,† Natalia Olahova,† Andres E. Muń ̃oz Gandarillas, ‡ Hadiseh Karimi,‡ Marko R. Djokic,† Marie-Françoise Reyniers, † Guy B. Marin,† and Kevin M. Van Geem*,† †Ghent University, Laboratory for Chemical Technology, Technologiepark 914, 9052 Gent,