scholarly journals Lag, Constant and Decay Release Characteristic of St-PVOH Encapsulated Urea as a Function of Coating Thickness Using Different Empirical Models

2019 ◽  
Author(s):  
Chigozie Francolins Uzoh ◽  
Stone Raphael Odera
Keyword(s):  
Coating Thickness ◽  
Empirical Models ◽  
Release Characteristic

scholarly journals Quantitative Analysis of Electroplated Nickel Coating on Hard Metal

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Hassan A. Wahab ◽  
M. Y. Noordin ◽  
S. Izman ◽  
Denni Kurniawan
Keyword(s):  
Coating Thickness ◽  
Nickel Coating ◽  
Hard Metal ◽  
Metal Substrate ◽  
Empirical Models ◽  
Electrode Gap ◽  
High Quality ◽  
Diamond Deposition ◽  
Nickel Deposition ◽  
Electroplating Process

Electroplated nickel coating on cemented carbide is a potential pretreatment technique for providing an interlayer prior to diamond deposition on the hard metal substrate. The electroplated nickel coating is expected to be of high quality, for example, indicated by having adequate thickness and uniformity. Electroplating parameters should be set accordingly for this purpose. In this study, the gap distances between the electrodes and duration of electroplating process are the investigated variables. Their effect on the coating thickness and uniformity was analyzed and quantified using design of experiment. The nickel deposition was carried out by electroplating in a standard Watt’s solution keeping other plating parameters (current: 0.1 Amp, electric potential: 1.0 V, and pH: 3.5) constant. The gap distance between anode and cathode varied at 5, 10, and 15 mm, while the plating time was 10, 20, and 30 minutes. Coating thickness was found to be proportional to the plating time and inversely proportional to the electrode gap distance, while the uniformity tends to improve at a large electrode gap. Empirical models of both coating thickness and uniformity were developed within the ranges of the gap distance and plating time settings, and an optimized solution was determined using these models.

X-RAY STUDIES RELATED TO COATING THICKNESS MEASUREMENTS

1984 ◽  
Vol 45 (C2) ◽  
pp. C2-33-C2-36 ◽  
Author(s):  
D. A. Sewell ◽  
I. D. Hall ◽  
G. Love ◽  
J. P. Partridge ◽  
V. D. Scott
Keyword(s):  
Coating Thickness ◽  
X Ray ◽  
Thickness Measurements

Analysis of methods for checking coating thickness gauges

Metrologiya ◽  
2019 ◽  
pp. 3-16
Author(s):  
V.S. Sekatsky ◽  
O.A. Gavrilova ◽  
N.V. Merzlikina ◽  
V.N. Morgun Morgun
Keyword(s):  
Coating Thickness

Semi-Empirical Models for the Variation of Soil Complex Permittivity with Depth

2008 ◽  
Vol 4 (1) ◽  
pp. 26-32
Author(s):  
Jawad K. Ali ◽  
Adil H. Ahmad
Keyword(s):  
Complex Permittivity ◽  
Empirical Models ◽  
Soil Complex ◽  
Semi Empirical

Evaluation of the accuracy indicators in determination of the coating thickness by crater grinding method

2020 ◽  
Vol 86 (7) ◽  
pp. 39-44
Author(s):  
K. V. Gogolinsky ◽  
A. E. Ivkin ◽  
V. V. Alekhnovich ◽  
A. Yu. Vasiliev ◽  
A. E. Tyurnina ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Functional Dependence ◽  
Measurement Procedure ◽  
Metrological Certification ◽  
Measuring Instruments ◽  
Properties Of Coatings ◽  
Special Equipment ◽  
Grinding Method ◽  
Accuracy Of Measurements ◽  
Wide Range

Thickness is one of the key indicators characterizing the quality and functional properties of coatings. Various indirect methods (electromagnetic, radiation, optical) most often used in practice to measure thickness are based on the functional dependence of a particular physical parameter of the system «base – coating» on the coating thickness. The sensitivity of these procedures to the certain properties of coatings imposes the main restriction to the accuracy of measurements. Therefore, the development and implementation of the approaches based on direct measurements of geometric parameters of the coating appears expedient. These methods often belong to the class of «destructive» and, in addition to measuring instruments, require the use of special equipment. To ensure the uniformity of measurements in the laboratory or technological control, these methods are isolated as a separate procedure (method) and must undergo metrological certification in accordance with GOST R 8.563–2009. We present implementation, metrological certification and practical application of the method for measuring thickness of coatings by crater-grinding method. The principles of technical implementation of test equipment, measurement procedure and calculation formulas are described. The results of evaluating the accuracy indicators of the proposed procedure by calculation and experimental methods are presented. In both cases, the relative error did not exceed 6%. The applicability of the developed technique is shown for a wide range of coating materials (from soft metals to superhard ceramics) of different thickness (with from units to hundreds of micrometers). Apart from the goals of process control and outgoing inspection, the method can be recommended as a reference measurement procedure for calibration of measures and adjusting samples for various types of thickness gauges.

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