scholarly journals Computer controlled detonation spraying: a spraying process upgraded to advanced applications

2011 ◽  
Author(s):  
I. Smurov ◽  
V. Ulianitsky
Keyword(s):  
Detonation Spraying ◽  
Computer Controlled ◽  
Spraying Process ◽  
Advanced Applications

scholarly journals TECHNOLOGY FOR RESTORATION AND REPAIR OF AIRCRAFT ENGINE PARTS

Aviation ◽  
2021 ◽  
Vol 25 (4) ◽  
pp. 262-267
Author(s):  
Serhii Nyzhnyk ◽  
Ihor Zorik ◽  
Kostiantyn Danko ◽  
Justas Nugaras
Keyword(s):  
Titanium Alloy ◽  
Substrate Surface ◽  
Aircraft Engine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Technological Parameters ◽  
Detonation Spraying ◽  
Compressor Blades ◽  
Complex Technology ◽  
Spraying Process

Problems of increasing the service life of compressor blades of aircraft gas turbine engines using detonation spraying technology are considered. The simulation of the parameters of the velocity and temperature of the particles of the sprayed material in the barrel of the detonation unit and in the flooded space to the substrate was carried out, followed by the choice of the optimal technological parameters of the spraying process. The control system of the detonation unit has been modernized. An experiment was carried out on the deposition of the Al2O3 coatings on the samples of a substrate made of titanium alloy VT3-1. Based on the results of the experiment, technological recommendations were developed concerning both the parameters of the spraying process and the parameters of the preparation of the substrate surface before spraying. The equipment for brazing the blades of the guide vanes is described and a device for spraying coatings on the end surfaces of the compressor blades is proposed. Thus, a complex technology has been developed for restoring the end surfaces of titanium alloy compressor blades by deposition of Al2O3 coatings.

Application of Taguchi Method to the Optimization of Detonation Spraying Process

2000 ◽  
Vol 15 (1) ◽  
pp. 139-153 ◽  
Author(s):  
P. Saravanan ◽  
V. Selvarajan ◽  
D. Srinivasa Rao ◽  
S.V. Joshi ◽  
G. Sundararajan
Keyword(s):  
Taguchi Method ◽  
Detonation Spraying ◽  
Spraying Process

scholarly journals Computer-Controlled Detonation Spraying: Flexible Control of the Coating Chemistry and Microstructure

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1244 ◽  
Author(s):  
Vladimir Yu. Ulianitsky ◽  
Dina V. Dudina ◽  
Alexandr A. Shtertser ◽  
Igor Smurov
Keyword(s):  
Chemical Properties ◽  
Ceramic Composites ◽  
Detonation Spraying ◽  
Gaseous Mixtures ◽  
Flexible Control ◽  
Variable Chemical ◽  
Computer Controlled ◽  
Detonation Gun ◽  
Chemical And Phase Compositions ◽  
Novel Applications

This article is a focused review aimed to describe the potential of the computer-controlled detonation spraying (CCDS) for producing and designing coatings with variable chemical and phase compositions and microstructure and promising properties. The development of the detonation spraying method is briefly analyzed from a historical perspective and the capabilities of the state-of-the art facilities are presented. A key advantage of the CCDS is the possibility of using precisely measured quantities of the explosive gaseous mixtures for each shot of the detonation gun and different oxygen to fuel ratios, which can create spraying environments of different chemical properties—from severely oxidizing to highly reducing. The significance of careful adjustment of the spraying parameters is shown using material systems that are chemically sensitive to the composition of the spraying environment and temperature. Research performed by the authors on CCDS of different materials—metals, ceramics, intermetallics and metal-ceramic composites is reviewed. Novel applications of detonation spraying using the CCDS technology are described.

scholarly journals THE FEATURES OF DETONATION SPRAYING TECHNOLOGY FOR TUNGSTEN CARBIDE BASED COATINGS

2019 ◽  
Vol 16 (32) ◽  
pp. 739-754
Author(s):  
Lev Kh. BALDAEV ◽  
Boris G. KHAMITSEV ◽  
Sergey L. BALDAEV ◽  
Mikhail V. PROKOFIEV
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Heat Removal ◽  
Detonation Products ◽  
Detonation Spraying ◽  
Substrate Adhesion ◽  
A Minor ◽  
The Relationship ◽  
Carbide Component ◽  
Spraying Process

The authors studied the effect of key parameters of detonation spraying process on tungsten carbidebased coatings and their mechanical properties, microstructure, and phase composition. Two main tasks are solved when developing the technology for spraying the carbide-containing materials. The relationship is established between the phase composition of tungsten-based coatings and their strength, hardness, and substrate adhesion. It was established that the WC dissolution in the metal phase promotes the increase of substrate adhesion as well as strength and hardness of coating material. A procedure of spraying coatings in the reduction mode is proposed: i.e., using working gas mixtures with excess acetylene. It prevents the decarbonization of WC carbides under the action of detonation products and environment. The phase composition heterogeneity (both along with the layer thickness and along the spraying spot diameter) is established. This depends on a complex of factors that determine the intensity of heat removal from the area of layer formation. For optimizing the structure and the mechanical characteristics of the coating, we need to control decarbonization of carbide component (WC) and formation of Ni (W) solid solution at different stages of spraying. Even a minor departure from carbon content leads to either appearance of graphite or formation of the fragile phase (Co3W3C), thus strongly reducing the mechanical properties.

Possibilities of the Computer-Controlled Detonation Spraying method: A chemistry viewpoint

2014 ◽  
Vol 40 (2) ◽  
pp. 3253-3260 ◽  
Author(s):  
Dina V. Dudina ◽  
Igor S. Batraev ◽  
Vladimir Yu. Ulianitsky ◽  
Michail A. Korchagin
Keyword(s):  
Detonation Spraying ◽  
Computer Controlled ◽  
Spraying Method

Computer controlled detonation spraying of WC/Co coatings containing MoS2 solid lubricant

2012 ◽  
Vol 206 (23) ◽  
pp. 4763-4770 ◽  
Author(s):  
A. Shtertser ◽  
C. Muders ◽  
S. Veselov ◽  
S. Zlobin ◽  
V. Ulianitsky ◽  
...  
Keyword(s):  
Solid Lubricant ◽  
Detonation Spraying ◽  
Computer Controlled

SPECTRA: A program for processing electron images of crystals

1992 ◽  
Vol 50 (1) ◽  
pp. 132-133
Author(s):  
M.F. Schmid ◽  
R. Dargahi ◽  
M. W. Tam
Keyword(s):  
Lattice Distortion ◽  
Data Transfer ◽  
Reciprocal Lattice ◽  
Data Entry ◽  
Image Data ◽  
Distortion Correction ◽  
Specimen Preparation ◽  
Electron Image ◽  
Computer Controlled ◽  
Program Modules

Electron crystallography is an emerging field for structure determination as evidenced by a number of membrane proteins that have been solved to near-atomic resolution. Advances in specimen preparation and in data acquisition with a 400kV microscope by computer controlled spot scanning mean that our ability to record electron image data will outstrip our capacity to analyze it. The computed fourier transform of these images must be processed in order to provide a direct measurement of amplitudes and phases needed for 3-D reconstruction.In anticipation of this processing bottleneck, we have written a program that incorporates a menu-and mouse-driven procedure for auto-indexing and refining the reciprocal lattice parameters in the computed transform from an image of a crystal. It is linked to subsequent steps of image processing by a system of data bases and spawned child processes; data transfer between different program modules no longer requires manual data entry. The progress of the reciprocal lattice refinement is monitored visually and quantitatively. If desired, the processing is carried through the lattice distortion correction (unbending) steps automatically.

Applications of CCEM to Environmental Health Problems

1985 ◽  
Vol 43 ◽  
pp. 102-103
Author(s):  
R. J. Lee ◽  
J. S. Walker
Keyword(s):  
Electron Microscopy ◽  
Image Analysis ◽  
Environmental Health ◽  
Computer Control ◽  
External Agent ◽  
External Agents ◽  
Computer Controlled ◽  
Primitive State ◽  
Textural Changes ◽  
General Aspects

Electron microscopy (EM), with the advent of computer control and image analysis techniques, is rapidly evolving from an interpretative science into a quantitative technique. Electron microscopy is potentially of value in two general aspects of environmental health: exposure and diagnosis.In diagnosis, electron microscopy is essentially an extension of optical microscopy. The goal is to characterize cellular changes induced by external agents. The external agent could be any foreign material, chemicals, or even stress. The use of electron microscopy as a diagnostic tool is well- developed, but computer-controlled electron microscopy (CCEM) has had only limited impact, mainly because it is fairly new and many institutions lack the resources to acquire the capability. In addition, major contributions to diagnosis will come from CCEM only when image analysis (IA) and processing algorithms are developed which allow the morphological and textural changes recognized by experienced medical practioners to be quantified. The application of IA techniques to compare cellular structure is still in a primitive state.

High-speed brightfield 3-D imaging and 3-D image analysis of thick and overlapped cell clusters in cytological preparations

1994 ◽  
Vol 52 ◽  
pp. 218-219
Author(s):  
Robert W. Mackin
Keyword(s):  
Image Analysis ◽  
High Speed ◽  
Three Dimensional ◽  
Image Data ◽  
Ccd Camera ◽  
Objective Lens ◽  
Array Processor ◽  
Vaginal Smears ◽  
Low Contrast ◽  
Computer Controlled

This paper presents two advances towards the automated three-dimensional (3-D) analysis of thick and heavily-overlapped regions in cytological preparations such as cervical/vaginal smears. First, a high speed 3-D brightfield microscope has been developed, allowing the acquisition of image data at speeds approaching 30 optical slices per second. Second, algorithms have been developed to detect and segment nuclei in spite of the extremely high image variability and low contrast typical of such regions. The analysis of such regions is inherently a 3-D problem that cannot be solved reliably with conventional 2-D imaging and image analysis methods.High-Speed 3-D imaging of the specimen is accomplished by moving the specimen axially relative to the objective lens of a standard microscope (Zeiss) at a speed of 30 steps per second, where the stepsize is adjustable from 0.2 - 5μm. The specimen is mounted on a computer-controlled, piezoelectric microstage (Burleigh PZS-100, 68/μm displacement). At each step, an optical slice is acquired using a CCD camera (SONY XC-11/71 IP, Dalsa CA-D1-0256, and CA-D2-0512 have been used) connected to a 4-node array processor system based on the Intel i860 chip.

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