Abstract
The paper presents the methodology behind the statistical selection of input parameters using the example of spraying two cold-sprayed coatings. The Ti and Cr3C2-25(Ni20Cr)-Gr coatings were tested. Despite the large difference in the structure of these coatings, nanoindentation studies were carried out focusing on the nano hardness H and elastic modulus E. Based on the four input parameters and two output parameters, a 2-level factorial 2(k-p) experimental design was performed. The conducted analysis showed the significant influence of the spray distance on the H and E values in the case of the Ti coating. The input parameters of the spray distance and the type of carrier gas used turned out to be statistically significant in the case of the cermet coating. Taking into account the statistical analysis, the coatings were sprayed with modified values of the input parameters.
Highlights
The basic functions of thermal spray coatings include different applications, e.g. wear-resistant and regenerating coatings [1,2,3,4]
Cold spraying is the latest generation of this technology and is widely used in production engineering, as well as in implantology [6]
Does a change in the factor value affect the final result and what is its share in the final result? The solution to this problem would be to change the input quantities values according to a complete plan, that is, to try all possible combinations of the values of the input quantities that make up the design of the experiment plan
Summary
The basic functions of thermal spray coatings include different applications, e.g. wear-resistant and regenerating coatings [1,2,3,4]. Coatings with a thickness of a few to several mm make it possible to produce individual products, being classified as additive technologies [5]. Cold spraying is the latest generation of this technology and is widely used in production engineering, as well as in implantology [6]. 2(k-p) optimization methods were tested for the selection of controlled parameters of the experiment to obtain high values of H and E of coatings applied with the SC technology. The coatings were deposited by a cold spray process. This method ensures the absence of phase transitions during the coating application process. The material does not melt, minimising the influence of the process on properties of the resulting coating
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