|
|
Solder Joint Reliability and Wetting Characteristics Influence
Labaj, Radek ; Stejskal, Petr (referee) ; Starý, Jiří (advisor)
This thesis deals with the methodology of testing the wetting characteristics for different material and process effects in the double-plated base material. Testing is performed by wetting balance method. There is designed procedure to calculate the angles on each side of the non-homogeneous material. The Design of Experiments method is used to interpret the results, by using this method are also interpreted electrical and mechanical properties of solder joints. The correlation with wetting characteristics is discussed.
|
|
|
Influence of Inert Atmosphere on Surface Wetting in Lead Free Soldering
Nestrojil, Michal ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This master´s thesis dealing with study of influence of inert atmosphere on the wettability of soldered surfaces. The theoretical part is discussed the issue of the soldering, solder joint, oxidation, and inert atmosphere. The glass cover with internal inert gas preheating for the wetting balance testing was prepared in the practical part. With this adjustment were realised tests, in which was examined the effect of the inert gases on the wettability of different materials combination. Further experiments were focused on plasma surface cleaning as possible flux substitution. The evaluation of these experiments were discussed in the end of this master´s thesis. Some of topics were designed for further experiments.
|
|
|
Evaluation of wood surface treatments by non-destructive methods
Plšek, Matěj ; Brožovský, Jiří (referee) ; Vaněrek, Jan (advisor)
This bachelor thesis will be describing the basic technologies of timber processing and macroscopic signs according to which the visual strength grading is performed. Imaging methods will be described to identify the roughness of wood surface. In the experimental part, the surface roughness parameters for various surface treatment methods will be determined and the dependence of the surface roughness on wetting and penetration depth of the adhesive will be monitored.
|
|
| |
|
|
Fabrication of aluminium nano-templates by controlled dip anodizing
Stehlíček, Kamil ; Dvořák, Petr (referee) ; Lednický, Tomáš (advisor)
In this thesis we focus on the optimization of the technological process of making porous aluminium oxide (porous alumina), with emphasis on the level of orderliness of the final structure. Theoretical part is aimed primarily at the research part with overlap to defining the initial parameters values for experimental part. Experimental part is then focused on finding the optimal values of experimental parameters. Parallel task to the experimental part is the assembly of the laboratory setup used for anodization process.
|
|
|
Fabrication of aluminium nano-templates by controlled dip anodizing
Stehlíček, Kamil ; Dvořák, Petr (referee) ; Lednický, Tomáš (advisor)
In this thesis we focus on the optimization of the technological process of making porous aluminium oxide (porous alumina), with emphasis on the level of orderliness of the final structure. Theoretical part is aimed primarily at the research part with overlap to defining the initial parameters values for experimental part. Experimental part is then focused on finding the optimal values of experimental parameters. Parallel task to the experimental part is the assembly of the laboratory setup used for anodization process.
|
|
|
Smáčivost povrchu dřeva kapalinami v závislosti na jeho drsnosti
Kořínek, Zdeněk
This work discusses about the problems of surface properties of wood. Specifi-cally engaged wettability depending on the influence of mechanical processing concrete-ly on the influence of rotational speed of the speed during milling of the oak wood. And the experimental determination of contact angle and the surface free energy according to the methodology of Liptakova and Kudela. From the measurements it was found, that the impact speed of the rotation of the tool causes increase a speed and increase of contact angle and decrease the surface ener-gy and vice versa. The main question remains a factor that causes this effect, because the roughness measurement was no indication the main factor that would influence this is-sue. The values of the surface energy of wood ranges from 59 to 82 mJ/m2 in all the measured speeds.
|
|
|
Evaluation of wood surface treatments by non-destructive methods
Plšek, Matěj ; Brožovský, Jiří (referee) ; Vaněrek, Jan (advisor)
This bachelor thesis will be describing the basic technologies of timber processing and macroscopic signs according to which the visual strength grading is performed. Imaging methods will be described to identify the roughness of wood surface. In the experimental part, the surface roughness parameters for various surface treatment methods will be determined and the dependence of the surface roughness on wetting and penetration depth of the adhesive will be monitored.
|
|
| |
|
|
Influence of Inert Atmosphere on Surface Wetting in Lead Free Soldering
Nestrojil, Michal ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This master´s thesis dealing with study of influence of inert atmosphere on the wettability of soldered surfaces. The theoretical part is discussed the issue of the soldering, solder joint, oxidation, and inert atmosphere. The glass cover with internal inert gas preheating for the wetting balance testing was prepared in the practical part. With this adjustment were realised tests, in which was examined the effect of the inert gases on the wettability of different materials combination. Further experiments were focused on plasma surface cleaning as possible flux substitution. The evaluation of these experiments were discussed in the end of this master´s thesis. Some of topics were designed for further experiments.
|
guest ::
