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Optimization of surface treatment of stainless steels
Mačátová, Lucie ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
The project deals with the processes of degreasing industry and testing new laser cleaning process, which has been experimentally verified and tested in the production process. Project also deals with soldering in general as a technology of joining metals. Included are the main components of the soldering, such as solder, flux, the types of connections and their use, ways of soldering and last but not least the soldering corrosion-resistant steel.
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Electromagnetic analysis of circuit breaker tripping unit
Mlynář, Zdeněk ; Augusta, Zbyněk (referee) ; Valenta, Jiří (advisor)
Using circuit breakers as devices for protecting the circuit, equipment, property, and not least the people is an important part of the generation, transmission and distribution of electricity. This puts high demands on the design of complex devices such as circuit breakers. To ensure proper function is one of many parts and that is the trip unit. Trip unit is used to evaluate the current flowing through the breaker and respond to undesirable overcurrent. For these reasons, this work deals with electromagnetic analysis - specifically thermal magnetic trip unit. The focus will be on improving the actual situation and finding more suitable design solutions.
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Influence of printed board surface finishing on solderability with vapour soldering
Matras, Jan ; Starý, Jiří (referee) ; Šandera, Josef (advisor)
Thesis deals with vapor soldering and wetting the surface with solder during the soldering process. It describes in detail the advantages and disadvantages of various surface finishes on the PCB. Generally characterizes the properties of lead-free solders and fluxes. Describes vapor soldering process, including the properties of the liquid itself. It also focuses on a method of evaluating the wettability by using solder balls and its performance on individual samples surface finishes.
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Life and work of Isaac Newton
MAŇÁSKOVÁ, Lenka
The work is intended as a study text for the course History of Physics. It is divided into four parts. The first part is briefly summarized Newton's entire life. The second part is an overview of the political situation in Europe and the state of scientific knowledge in Newton's times. There is a list of prominent scientific personalities. The third part describes Newton's work in the field of mathematics, classical mechanics, optics and astronomy. There is also mention of ether. Part four briefly describes the work, "Mathematical Principles of Natural Philosophy".
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Sintering ability of feldspars and their alternatives
Votava, Petr ; Štubňa,, Igor (referee) ; Sokolář, Radomír (advisor)
The main goal of this Bachelor’s thesis is to compare sintering ability of feldspars which are the most used flux in ceramics with their alternatives such as quarry dust and bone ash. Theoretic part describes process of sintering, sintering activities of used fluxes and their use in the manufacture of ceramics. Practical part is dedicated to description and evaluation of experiment in witch sintering activities of various fluxes ceramic product are compared in dependence on their percent proportion in raw material mix.
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Lead-Free Voids Cause Mechanisms and Influence on Reliability
Šimon, Vojtěch ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
The aim of this work is to analyze reliability of lead-free solder join, in particular the voids generated during the soldering process. The main target of the theoretical part of the work is to isolate basic mechanisms of formation of the voids and optimize the soldering process. The practical part of the paper is based on monitoring the count and size of the voids in a solder join. An X-Ray tomograph has been chosen as a non-destructive method of detection. The statistical part of this work compares conventional soldering of the entire board with local soldering by IR radiation.
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HAL Technology and Selected Parameters Influence on Quality
Jakub, Miroslav ; Jana, Toulová (referee) ; Starý, Jiří (advisor)
Bachelor thesis describes and deals the problems of printed circuit boards production. It focuses on issues of process of lead – free HAL and influence of selected parameters on quality in production process GATEMA s.r.o. in Boskovice. Bachelor thesis contains analysis of PCB using microsection, optical microscopy and a sample of defects created during this process. Bachelor thesis presents on the test boards quality of solder mask developing, evaluates flux contamination with water, residual water on the PCB and it compares the PCB delay in liquid solder. It also determines the limit of non defective cover with the solder and determines the typical thickness of solder mask on the Cu pads and the ratio between the width of font and solder mask thickness.
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Electromigration of Flux Residues on PCB Surface
Tylich, Ondřej ; Zatloukal, Miroslav (referee) ; Starý, Jiří (advisor)
Diploma thesis introduces the problems of electromigration, fluxes and flux residues. It includes a proposal for methods of measuring surface insulation resistance, information about selected types of fluxes and conformal coatings. It focuses on the influence of temperature, humidity. There are applied conductometric method and method of measuring SIR by IPC-25-B. The thesis describes the practical measurement of SIR and ionic contamination of PCB covered with flux and influence of RH, temperature and applied voltage is evaluated and discussed.
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Analysis of Aplication Flux and Solder Paste on PCB for BGA components
Toufar, Michal ; Řihák, Pavel (referee) ; Vala, Radek (advisor)
This thesis deals with rework of BGA components. There are described defects and errors in a solder joints. The current trend is focused on thin packages with fine pitch. It is assembled with smaller and smaller solder balls. It is described effect of different application of flux and solders paste for rework. The main part is focused on dipping and dispensing. These methods are suitable for repair process.
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