Properties of Alumina Coatings Deposited by Detonation Spraying

2021 ◽  
Vol 1016 ◽  
pp. 1350-1355
Author(s):  
Vladimir Ulianitsky ◽  
Alexandr Shtertser ◽  
Igor Batraev ◽  
Igor Smurov
Keyword(s):  
Silicone Oil ◽  
Computer Control ◽  
Erosive Wear ◽  
Dielectric Strength ◽  
Alumina Powder ◽  
Specific Resistivity ◽  
Computer Control System ◽  
Detonation Spraying ◽  
Gun Barrel ◽  
Coating Microstructure

Coatings deposited by detonation spraying equipment CCDS2000 using alumina powder are studied. CCDS2000 is characterized by a computer control system, robot compatible spraying unit (gun barrel), a portable chiller, two powder feeders, and other peculiar properties. This installation allows to deposit coatings on complex shape surfaces and thin-walled parts under optimal conditions. Studies of the coating properties included measurements of coating microstructure, porosity, microhardness, adhesion, cohesion, abrasive and erosive wear, and dielectric properties (specific resistivity and dielectric strength). The detonation sprayed coatings have an adhesion of 60-70 MPa, cohesion of 100 MPa, microhardness of 1500 HV100, porosity of about 1% (measured on microsections of coatings using OLYMPUS Stream Image Analysis software). Impregnation of coatings with silicone oil showed that the real open porosity of coatings is up to 6%. Dielectric strength of the ceramic layer with the thickness of 200 μm exceeds 30 kV/mm. Specific resistivity depends on atmospheric humidity and when the relative humidity is less than 60%, the specific resistivity is greater than 1013 Ω·cm.

A computer-control program for TEM in situ fatigue experiments

1989 ◽  
Vol 47 ◽  
pp. 620-621
Author(s):  
Kenneth S. Vecchio ◽  
John A. Hunt
Keyword(s):  
Slow Crack Growth ◽  
Computer Control ◽  
Control Program ◽  
Video Tape ◽  
Computer Control System ◽  
Transmission Electron ◽  
In Situ Experiments ◽  
Tremendous Amount ◽  
And Control

In-situ experiments conducted within a transmission electron microscope provide the operator a unique opportunity to directly observe microstructural phenomena, such as phase transformations and dislocation-precipitate interactions, “as they happen”. However, in-situ experiments usually require a tremendous amount of experimental preparation beforehand, as well as, during the actual experiment. In most cases the researcher must operate and control several pieces of equipment simultaneously. For example, in in-situ deformation experiments, the researcher may have to not only operate the TEM, but also control the straining holder and possibly some recording system such as a video tape machine. When it comes to in-situ fatigue deformation, the experiments became even more complicated with having to control numerous loading cycles while following the slow crack growth. In this paper we will describe a new method for conducting in-situ fatigue experiments using a camputer-controlled tensile straining holder.The tensile straining holder used with computer-control system was manufactured by Philips for the Philips 300 series microscopes. It was necessary to modify the specimen stage area of this holder to work in the Philips 400 series microscopes because the distance between the optic axis and holder airlock is different than in the Philips 300 series microscopes. However, the program and interfacing can easily be modified to work with any goniometer type straining holder which uses a penrmanent magnet motor.

scholarly journals PEP Computer Control System

1979 ◽  
Vol 26 (3) ◽  
pp. 3267-3271 ◽  
Author(s):  
A. W. Chao ◽  
R. A. Early ◽  
J. D. Fox ◽  
A. E. Gromme ◽  
R. H. Helm ◽  
...  
Keyword(s):  
Control System ◽  
Computer Control ◽  
Computer Control System

Computer Control System for Continuous Reheating Furnace

1981 ◽  
Vol 14 (2) ◽  
pp. 2619-2624
Author(s):  
M. Kamata ◽  
S. Murakami ◽  
H. Wakasuki
Keyword(s):  
Control System ◽  
Computer Control ◽  
Computer Control System ◽  
Reheating Furnace

Design of Hydraulic Descaling Computer Control System

2014 ◽  
Vol 608-609 ◽  
pp. 19-22
Author(s):  
Ping Xu ◽  
Jian Gang Yi
Keyword(s):  
Control System ◽  
Stability Problem ◽  
Computer Control ◽  
Control Methods ◽  
Computer Control System ◽  
Control Software ◽  
Pressure Water ◽  
Working Principle ◽  
The Stability

Hydraulic descaling system is the key device to ensure the surface quality of billet. However, traditional control methods lead to the stability problem in hydraulic descaling system. To solve the problem, the construction of the hydraulic descaling computer control system is studied, the working principle of the system is analyzed, and the high pressure water bench of hydraulic descaling is designed. Based on it, the corresponding computer control software is developed. The application shows that the designed system is stable in practice, which is helpful for enterprise production.

Once Bitten — Twice Shy

1980 ◽  
Vol 13 (10) ◽  
pp. i-i
Author(s):  
Joe Wilson
Keyword(s):  
Control System ◽  
Process Control ◽  
Control Engineer ◽  
Computer Control ◽  
Digital System ◽  
Computer Control System ◽  
Computer Based ◽  
New System

Outlines the problems and self-questioning facing the process control engineer when deciding to replace the computer control system which he has found difficult to justify over the last decade. Should he return to conventional analogue instrumentation or choose a microprocessor based control system? Having highlighted in his mind the problems with his computer based system, has he missed the majority of the advantages which a digital system brings? Does he realise that a major manufacturer has been acutely aware of his problems and has sought to eliminate them with the design of any new system? Can his faith be restored?

Sign in / Sign up

Export Citation Format

Share Document