The formation mechanism providing high-adhesion properties of an electric-explosive coating on a metal basis

2013 ◽  
Vol 58 (3) ◽  
pp. 82-84 ◽  
Author(s):  
E. A. Budovskikh ◽  
V. E. Gromov ◽  
D. A. Romanov
Keyword(s):  
Formation Mechanism ◽  
Adhesion Properties ◽  
High Adhesion ◽  
Metal Basis

scholarly journals Production of modified adhesive composites based on EVA and modified PE

2020 ◽  
pp. 45-47
Author(s):  
M. D. Sizova ◽  
A. N. Zelenetsky ◽  
V. Ya. Ivolgin
Keyword(s):  
Maleic Anhydride ◽  
Polymer Matrix ◽  
Morphological Changes ◽  
Adhesive Properties ◽  
Adhesion Properties ◽  
High Adhesion

An adhesive based on EVA and LDPE is developed which can be used up to 60°C. It was modified by polyisocyanate fragments of a grafted and reticulate nature for structural and morphological changes of the polymer matrix and improvement of physical, mechanical and adhesive properties. For additional compatibilization of the components, LDPE modified with maleic anhydride (MA) was used. High adhesion properties of the obtained composites were confirmed.

Characterization of the sortase A from Lactobacillus acidophilus ATCC 4356 involved in adherence to intestinal cells

2020 ◽  
Vol 15 (7) ◽  
pp. 485-496 ◽  
Author(s):  
Zhen Wu ◽  
Jing Wu ◽  
Fengxuan Lang ◽  
Zhendong Cai ◽  
Xiaoqun Zeng ◽  
...  
Keyword(s):  
Lactobacillus Acidophilus ◽  
Active Sites ◽  
Probiotic Strain ◽  
Site Directed Mutagenesis ◽  
Adhesion Properties ◽  
Class A ◽  
Adhesion Ability ◽  
High Adhesion ◽  
Phenyl Vinyl

Aim: Confirmation of the enzymatic activity of Class A sortase (SrtA) in probiotic strain Lactobacillus acidophilus associated with the adhesion properties. Materials & methods: SrtA from L. acidophilus ATCC 4356 was purified and its enzymatic properties was investigated by site-directed mutagenesis approach and the sensitivity to metal ions was also detected. Results: SrtA of L. acidophilus ATCC4356 can recognize LPxTG and LPxTD sorting motifs. The active sites of SrtA include His137, Cys198 and Arg205. Furthermore, acacetin can increase the activity of SrtA, while phenyl vinyl sulfone could effectively inhibit the activity of SrtA with an IC50 of 143.32 μg/ml. The adhesion ability of L. acidophilus was also decreased resulting from the inhibition of SrtA activity. Conclusion: The unique properties of SrtA of L. acidophilus can provide some insights into the development of high-adhesion Lactobacillus strains in the GI tract.

Determination of adhesive characteristics of coatings by application a modern scratch test. Part 1. Possibilities of application a modern scratch test to determine adhesion properties of coatings.

2020 ◽  
Vol 76 (2) ◽  
pp. 143-152
Author(s):  
V. K. Belov ◽  
E. V. Gubarev ◽  
O. V. Krivko ◽  
A. V. Papshev ◽  
N. G. Gofman ◽  
...  
Keyword(s):  
Scratch Test ◽  
Ceramic Coatings ◽  
Strength Parameters ◽  
Subjective Character ◽  
Properties Of Coatings ◽  
Adhesion Properties ◽  
Power Characteristics ◽  
High Adhesion ◽  
Metal Products

At present, many kinds of metal products are produced with application of various coatings. Coatings along with requirements to provide their functional properties, must also meet additional general requirements, in particular, must have a high adhesion resistivity. Methods of direct measuring of adhesion characteristics considered. It was shown, that estimation of coatings adhesion properties by regular standard methods has a subjective character, since it is accomplished visually by specially trained laboratory assistants. Appearance of new standards and modern devices for determining of adhesion characteristics of different coatings by scratch test creates new possibilities of those properties regulation in digital form without subjective estimations. A methodology considered for determining coatings adhesion properties by application theory of scratch test. Estimation of strength parameters of the coating material depending on coating destruction character by power and geometric parameters of the deformation hearth was carried out. The relation of power characteristics of deformation hearth under indenter analyzed. Advantages and drawbacks of the scratch test quoted. It was noted, that implementation of new devices for the scratch test has required adoption of new standards for polymer and ceramic coatings. Implementation of those standards and devices for estimation of different coatings adhesion properties by application scratch test at present has no insuperable obstacles.

scholarly journals High-adhesion unlayered films: physical and technological basis of their production

2020 ◽  
Vol 28 (2) ◽  
pp. 75-78
Author(s):  
V. F. Bashev ◽  
S. I. Ryabtsev
Keyword(s):  
Q Factor ◽  
Adhesion Properties ◽  
Cu Films ◽  
Technological Basis ◽  
Potential Value ◽  
Plasma Sputtering ◽  
Ion Plasma ◽  
High Adhesion ◽  
Film Adhesion ◽  
Mechanical Separation

Using the modernized three-electrode ion-plasma sputtering method, high-adhesion Cu-films without underlayer were obtained. Films were deposited on glass-ceramic (sitall) substrates. The film thickness was ~500 nm. In this case, the calculated cooling rate reached ~ 1012–1014 K/s. The adhesion properties of Cu films were investigated by the standard method of mechanical separation of the film from the substrate – the “fungus” method. It is established that such film adhesion is more than 20 MPa. It is determined that the obtained high adhesion depends on bias potential value. Using these Cu films in strip resonators without a sublayer makes it possible to increase their Q-factor by 1.5–1.7 times and thereby significantly reduce the resulting operating noise.

Nanostructured Calcium Phosphate Coating for Stents

2007 ◽  
Vol 361-363 ◽  
pp. 721-724
Author(s):  
U. Lembke ◽  
Regina Lange ◽  
Ulrich Beck ◽  
Hans Georg Neumann
Keyword(s):  
Calcium Phosphate ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Metallic Surfaces ◽  
Good Adhesion ◽  
Adhesion Properties ◽  
High Adhesion ◽  
Reduced Risk

A nanoporous calcium phosphate (CaP) coating on metallic surfaces is presented. The coating consists of a stack of (a) a TiNbN layer deposited by physical vapor deposition and acting as diffusion barrier against allergenic ions, (b) a SiO2 xerogel layer providing good adhesion properties and designing the nanoporosity of the outer CaP layer (c) precipitated electrochemically. SEM results verified a homogeneous nanoscale porous structure of the CaP coating. It is characterized by a high adhesion strength. If applied to stent covering the nanoporous CaP coating has promising properties to initiate rapid endothelium formation and reduced risk of restenosis.

Three-Layer Coating for Stents with Nanostructured Surface

2008 ◽  
Vol 396-398 ◽  
pp. 627-630
Author(s):  
Ulrich Beck ◽  
Regina Lange ◽  
U. Lembke ◽  
Hans Georg Neumann
Keyword(s):  
Vapour Deposition ◽  
Nanoporous Structure ◽  
Physical Vapour Deposition ◽  
Nanostructured Surface ◽  
Good Adhesion ◽  
Adhesion Properties ◽  
High Adhesion ◽  
Cap Layer ◽  
Layer Coating ◽  
Reduced Risk

A three-layer coating for stents with a nanostructured surface of calcium phosphate (CaP) is pre-sented. The coating stack consists of (a) a TiNbN layer deposited by physical vapour deposition and acting as diffusion barrier against allergenic ions, (b) a SiO2 xerogel layer providing good adhesion properties and designing the nanoporosity of the outer CaP layer (c) precipitated electrochemically. The verification of the SiO2-layer (and therewith its influence onto adhesion and structure of the outer CaP layer) succeeded only by use of XPS because of the very small amount of the xerogel. SEM results verified a homogeneous nanoscale nanoporous structure of the CaP coating. It is char-acterised by high adhesion strength. If applied for stent covering the nanoscale CaP coating has promising properties to initiate rapid endothelium formation and reduced risk of restenosis.

scholarly journals Modification of polyolefins by reactive extrusion methods: a comparison of melt and solid-state modifications carried out on the same equipment

2020 ◽  
Vol 1 (11-12) ◽  
pp. 21-26
Author(s):  
A. N. Zelenetsky ◽  
M. D. Sizova ◽  
V. P. Volkov ◽  
S. N. Zelenetsky ◽  
V. S. Bolduev
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Solid Phase ◽  
Chemical Properties ◽  
Reactive Extrusion ◽  
Physical And Chemical Properties ◽  
Adhesion Properties ◽  
High Adhesion ◽  
Physical And Chemical ◽  
And Chemical Properties

The modification of polyolefi ns by polar monomers in the melt and solid state on one extruder was investigated. The features of changes in the physical and chemical properties of polyolefi ns with melt and solid modifi cations are studied.The reactivity of comonomers in liquid-phase and solid-phase modifi cation processes has been compared. The method of grafting solid modifi cation, in which pre-ozonated polyethylene is used as a copolymerization initiator, has been investigated. High adhesion properties of the copolymers were found.

Evaluation of Bond Strength With Void Subjected to Harmonic Peeling Loads

2001 ◽  
Author(s):  
A. Vaziri ◽  
H. R. Hamidzadeh ◽  
H. Nayeb-Hashemi
Keyword(s):  
Shear Stress ◽  
Dynamic Response ◽  
System Response ◽  
Harmonic Force ◽  
Adhesion Properties ◽  
High Adhesion ◽  
Initiation And Propagation ◽  
Bonded Joint ◽  
Out Of Plane ◽  
Bond Area

Abstract Joining components by using adhesives is becoming more popular with the development of adhesives with high adhesion properties. These components are often subjected to dynamic loading, which may cause initiation and propagation of failure in the joint. In order to ensure the reliability of these structures, their dynamic response and its variation with the presence of defects in the bonded area, must be understood. Dynamic response of a single lap joint subjected to an out of plane harmonic force is evaluated. The bonded joint is modeled as Euler Bernoulli beams, joined with an adhesive and constrained at one end and subjected to a harmonic force at the free end. The results show that the system response is not sensitive to a range of adhesive loss factor of 0-1. Furthermore, the system response is little affected by the presence of void in the bond area. The system response seems to be more sensitive to the void location than to its size. Peel and shear stress in bond area are obtained and found to be confined to the edge of the overlap. For adhesive and adherents properties and geometry investigated the maximum peel and shear stress in the bond area are little affected with the presence of a central void which covers less than 60% of the over lap length for all range of frequency. However, when the frequency of the applied load is close to the natural frequency of the structure, a void increases both maximum peel and shear stress.

Sign in / Sign up

Export Citation Format

Share Document