Wyniki wyszukiwania - BazTech

1

The Use of Black Coal Fly Ash at the Production of Ceramic Materials, 1. Part

Michalikova F., Brezani I., Sisol M., Mihokova L., Stehlikova B.

Inżynieria Mineralna

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2014

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R. 15, nr 1

227--234

EN

In the contribution, methods of utilizing power plant fly ash for the bricks production are presented. The utilization of fly ash at maximum of 30 % (wt) meets the requirements to the bending strength (after drying and firing) of the probe bricks. The laboratory tests prove the justification of the application of fly ash in the brick manufacturEng.

PL

W artykule przedstawiono metodę produkcji cegieł z wykorzystaniem popiołu lotnego z elektrowni. Udział popiołu lotnego w ilości 30% (wagowo) spełnia wymagania dotyczące wytrzymałości na zginanie (po wysuszeniu i wypaleniu) cegieł. Badania laboratoryjne wykazały skuteczność zastosowania popiołów lotnych w produkcji cegły.

2

Modification of the structure of the layers of superficial soda - calcium - silicon glasses nano molecules inorganic compounds

Drajewicz M., Sieniawski J.

Journal of Achievements in Materials and Manufacturing Engineering

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2012

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Vol. 53, nr 2

76--80

EN

Purpose: Finding a new surface treatment of glass. Design/methodology/approach: Testing results of the glass operational properties, such as bending strength, scratching resistance, micro-hardness, chemical resistance and optical properties have been presented. Nano-molecules were spread onto the heated glass surface, or onto cold glass surface and then heated up to temperatures close to the glass transformation, when nano-molecules penetrate into the glass surface. Findings: Refining method of soda - calcium - silicon glassy surfaces with inorganic compounds nanomolecules assures profitable operational properties of the glass, such as increased bending strength, scratching resistance, micro-hardness and chemical resistance without deterioration of the optical properties. Research limitations/implications: Structural definition of inorganic compounds nano-powders exposed to thermal processing, including grain-size analysis has been discussed. Practical implications: Optimal technical and technological parameters of the refining process have been selected. Originality/value: The presented method undoubtedly develops new possibilities not only in case of container glass, float glass and glass fibres but also in the field of glass processing.

3

Microstructure of thermal barrier coatings deposited by APS method with application of new type ceramic powders

Góral M., Sosnowy P.

Journal of Achievements in Materials and Manufacturing Engineering

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2012

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Vol. 55, nr 2

912--917

EN

Purpose: The paper presents results of structural research into thermal barrier coatings obtained by the APS. For the base the Rene 80 alloy was used, whereas a MeCrAlY-type multicomponent alloy was used for an interlayer. Design/methodology/approach: Throughout the research an optic microscope as well as a scanning electron microscope were employed. Measurements of the formed structure’s porosity were taken. Findings: It has been observed that application of novelty ceramic powders allows for a possibility of forming thermal barrier coatings, which can be used for protecting of the combustion chamber’s surface as well as turbine’s blades in an aircraft engine. Research limitations/implications: Further research into resistance to oxidation of these coatings seems necessary for experimental determination of their actual work temperature. Practical implications: They can be successfully applied in automotive industry for coating of petrol or diesel engine’s components. Originality/value: Investigation into possible applications of two-layer and composite coatings, which may improve the work temperature of thermal barrier coatings, is feasible.

4

Characterization of powders used for LPPS Thin Film plasma spraying of thermal barrier coatings

Góral M., Drajewicz M., Pytel M., Kotowski S.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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Vol. 47, nr 2

157--165

EN

Purpose: The authors described in this article the basic properties of materials used for spray process of thermal barrier coatings under low pressure The characteristic of selected powders applied for bond-coats and outer ceramic layer was introduced. The authors presented the analysis of powders based on zirconium oxide stabilized by yttrium oxide, magnesium and calcium. Design/methodology/approach: The described powders was analyzed by scanning electron microscopy and particle distribution by IPS U analyzer. Findings: The ceramic powders were characterized by irregular particle shape caused by grinding process. The only exception was Metco 204 powder, with spheroid-shaped particles. Research limitations/implications: The ceramic powders were made of zirconium oxide, which was stabilized by different types of oxides: yttrium (Metco 204), calcium (Metco 201) and magnesium (Metco 210). It is necessary to assess influence of the oxide, stabilizing the yttrium oxide, on stability of obtained ceramic layer of TBC coating. Practical implications: Powders analysed in the article will be submitted to plasma spraying process with different methods. Originality/value: The ceramic powder used for LPPS-Thin Film process were first time described.

5

Wear of ceramic tools in hard machining

Grzesik W.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 26, nr 2

127-130

EN

Purpose: The principle purpose of this investigation is to recognize the wear phenomenon of the mixed ceramic tips against 60 HRC alloy steel specimens in dry and hard turning operations. This knowledge allows optimal machining chains to be planned by the manufacturing engineers. Design/methodology/approach: Light optical microscopy (LOM), scanning electron microscopy (SEM), BSE technique and X-ray diffraction analysis (XRM) were applied for observations of worn tool surfaces, wear products and the distinction of wear mechanisms occurring. Findings: It was found that wear mechanisms observed in the machining tests involve abrasion, fracture, plastic flow, material transfer and tribochemical effects which appear depending on the mechanical and thermal conditions generated on the wear zones. Research limitations/implications: Investigations were performed under varying feed rate, constant cutting speed of 100 m/min and small depth of cut of 0.2 mm to perform finishing cuts. Practical implications: In this study both microscopic and microstructural aspects of ceramic tool wear were taken into consideration. Moreover, the development of the crater and flank wear and the associated wear mechanisms were identified. Originality/value: In particular, two types of transfer layer formation with different morphologies occurring at the rake-chip interface are distinguished.