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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 29
Vála, Lukáš , Vavruňková, Veronika , Jandová, Věra , Pola, Michal , Křenek, Tomáš
Formation of iron sulfide photocatalytic colloidal dispersion via pulsed laser ablation in liquids

Pulsed laser irradiation of iron sulfide in water and ethanol allows laser ablation and generation of FeS nano/micro particles. Measurement of the size distribution reveals 100, 1000 and 5000 nm sized particles in water and 180 nm sized particles in ethanol. The values of ...

Glanc, Aleš , Houdková Šimůnková, Šárka , Jansa, Zdeněk , Vostřák, Marek
Microstructure, tribological behaviour and xrd analysis of hvof sprayed and laser remelted cocrtaalcsiy coatings

Superalloys with cobalt as a base material are widely used among different industry applications. Their main advantages are excellent corrosion and wear resistance. Material CoCrTaAlCSiY was chosen for this study as an unexplored representative of Co-based superalloys with a potential for go...

Bricín, David , Jansa, Zdeněk , Somr, Josef , Elmanová, Andrea , Kříž, Antonín
Influence of heat treatment on properties of SD251-PH1 composite produced by additive SLM technology

The aim of this case study was to evaluate how heat treatment affects the structure and properties of the engineered composite material labelled SD251-PH1. This composite material was formed by mixing two powder blends in a weight ratio of 90 wt. % WC-Co powder SD251 with...

Průcha, Vojtěch , Bricín, David , Kříž, Antonín , Jansa, Zdeněk
Properties of Cryogenic Treated Cemented Carbides (WC-Co)

The present paper explores the effects of deep cryogenic treatment (DCT) on the properties of WC-Co cemented carbides. The investigation involved four different cemented carbide (CC) grades. Two of them were coarse-grained WC with grain sizes larger than 6 µm and binder fractions o...

Průcha, Vojtěch , Bricín, David
Properties of Borided Cemented Carbides with Various Binders

This paper explores the thermochemical treatment of cemented carbides (CC), specifically the boriding process. Six different types of CCs with different size of tungsten carbide (TC) grains were chosen as experimental materials. They contained binders of different chemical compositions. In five&#...

Bricín, David , Ackermann, Michal , Jansa, Zdeněk , Kubátová, Dana , Kříž, Antonín , Špirit, Zbyněk , Štafka, Jiří
Development of the structure of cemented carbides during their processing by SLM and HIP

The study focuses on microstructural evolution in a WC-Co powder mixture during Selective Laser Melting (SLM) and hot isostatic pressing (HIP) processing. This powder mixture contained a 13 plus/minus 0.6 % weight fraction of Co binder and WC particles of mean size of 3.0 ...

Bricín, David , Špirit, Zbyněk , Kříž, Antonín
Influence of boridation on microstructure and properties of aluminium alloy EN AW-2024

The aim of this case study was to analyse the influence of the boriding process on the structure and mechanical properties of the aluminium alloy EN AW 2024. The prepared samples were processed under various process parameters in Durferrit powder. After chemical-thermal treatment, ...

Bartoň Klufová, Pavla , Kříž, Antonín
Effects of basalt on corrosion resistance of composite basalt-copper laser cladding

The present contribution explores the effects of basalt on corrosion resistance of basalt-copper composite material which has been deposited onto steel substrate by laser cladding. For this experimental study, three mixtures of filler powders were prepared, containing 15, 20 and 25 weight&#x...

Bricín, David , Votava, Filip , Kubátová, Dana , Kříž, Antonín
Influence of the quality of models made by additive technologies on the quality of castings cast by investment casting

The article deals with the use of additive technologies (AM) to produce a fusible model for a casting. AM technologies SLA, FDM, or PolyJet have been used to create models of castings of musical instrument keys from various polymeric materials. The roughness profiles of the&#x...

Kříž, Antonín , Vilcsek, Igor , Kaleta, Karel
Oprava tělesa ventilu parní turbíny svařováním

This paper is based on the already published paper "The impact of steam turbine valve repair by welding on the change of material properties" and pays particular attention to the technology of welding repair. To determine the technology and assess its accuracy, a number&#...

Průcha, Vojtěch , Benešová, Soňa , Veselý, Vilém , Kesl, Miloslav
Effects of hot forging on the structural condition in HS 6-5-2 high-speed steel

Microstructure analysis was performed on rolled bars of high-speed steel after two and three forging cycles, each cycle comprising one upsetting and one drawing out operation. High-speed steels belong to difficult-to-form materials with a narrow forging temperature interval. Forging above the...

Bartoň Klufová, Pavla , Tittel, Jan , Vostřák, Marek , Jansa, Zdeněk , Kříž, Antonín
Corrosion resistance of laser-deposited composite copper-basalt overlay

This paper deals with an assessment of the corrosion resistance of copper-basalt composite cladded by laser. The filler powder for laser overlaying was a mixture of high-purity copper powder Oerlikon METCO 55 consisting of 45–90 µm particles and a basalt powder comprising particles 50–2...

Bartoň Klufová, Pavla , Vostřák, Marek , Kříž, Antonín
Chemical heterogeneity of Inconel 625 overlay with an increased molybdenum content and its evaluation using the potentiodynamic corrosion test

The paper focuses on a detailed analysis of chemical heterogeneity of Inconel 625 overlays with an increased molybdenum content deposited by laser cladding. Fifteen samples of laser overlays on S355J2 steel were prepared, each with an area of 90×140 mm. The thickness of the steel&#...

Khalaj, Omid , Saebnoori, Ehsan , Jirková, Hana , Chocholatý, Ondřej , Svoboda, Jiří
Corrosion Behavior and Mechanical Properties of New Developed Oxide Precipitation Hardened Steels

The Oxide Precipitation Hardened (OPH) steel is a new developed group of materials from Oxide Dispersion Strengthened (ODS) alloys which are well known advanced materials for high temperature properties. Besides, the corrosion resistance of these types of material is so important regarding&#...

Křenek, Tomáš , Mikysek, Petr , Pola, Michal , Vála, Lukáš , Melaré, Estela , Jandová, Věra , Vavruňková, Veronika , Rieger, David
Formation of metastable zirconium oxides using pulsed laser deposition of ZrO based target

There is a growing interest about the possibilities for preparation of various zirconium oxides from scientific as well asapplication point of view. Laser ablation of solid target consisting of sintered grains of metallic hexagonal Zr3O and monoclinic ZrO2 results in evaporation of Zr,&...

Bricín, David , Pomahač, Jiří , Kříž, Antonín
Degradation of Sintered Carbides in Different Corrosive Environments

The aim of the study was to determine the corrosion resistance of different types of sintered carbides in alkaline and acidic environments. The degradation environment for sintered carbides was chosen so that its pH corresponds to those with which these carbides normally come into&...

Bartoň Klufová, Pavla , Kříž, Antonín , Vostřák, Marek
Development of laser clads with high corrosion resistance for nuclear power industry

This contribution deals with development of a system consisting of a base material and a composite laser clad with high corrosion resistance. The cladding material for laser overlaying was a powder mixture of inorganic substances based on copper and oxides of silicon, iron, calcium...

Glanc, Aleš , Houdková Šimůnková, Šárka , Vostřák, Marek
Microstructure and tribological behavior of HVOF sprayed and laser treated CoCrTaAlCSiY coatings

Co-based alloys are used over a wide range of application because of their excellent corrosion and wear properties. Especially the Stellites (Co-Cr-W) are well known and quite well researched. The CoCrTaAlCSiY is a new material on the field of thermal spray coatings and due to...

Vála, Lukáš , Křenek, Tomáš
Advanced oxidation processes

There is a great interest in the synthesis of various nanosized green reusable catalysts which would better assist various chemical reactions in industrially important technologies. Heterogeneous catalysts are widely used in advanced oxidation processes. Its can remove organic pollutants in waste...

Průcha, Vojtěch , Benešová, Soňa , Veselý, Vilém , Kesl, Miloslav
The influence of hot forging on the size and frequency of carbides in HS 6-5-2

This paper follows on from a paper entitled “Effects of hot forging on the shape and size of prior austenite grain in HS 6-5-2 high-speed steel” which was devoted to a microstructure analysis of slugs from rolled bars of a high-speed steel after two and three forging...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 29