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Porous material produced by ceramic injection molding

Matula G., Krzysteczko J.

Journal of Achievements in Materials and Manufacturing Engineering

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2015

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Vol. 71, nr 1

14--21

EN

Purpose: The aim of this research is presented the process of alumina injection molding with a multicomponent binder system based on polymer (polypropylene – PP/polyethylene- HDPE), paraffin wax (PW) and stearic acid (SA). Debinding and sintering process was also studied. Design/methodology/approach: The volume fractions of powder in the feedstocks were 50%vol and the volume of polypropylene and polyethylene were changed from 0-22%vol. The concentrations of SA were kept at 6%vol. The feedstock was heated to melt the binder and injected into a mold. Debinding process was carried out after injection step. The organic part was removed through combination of solvent and thermal debinding. Samples were sintered at 1200-1600°C in one cycle with debinding process. Findings: Thermogravimetric analysis (TGA) was performed to determine decomposition temperatures of polypropylene, polyethylene, paraffin wax and stearic acid. Morphology of alumina powder by scanning electron microscopy (SEM) was disclosed. The microstructure and properties was tested to see how the selected sintering parameter ,as a temperature, affects the structure. Originality/value: The paper presents ceramic injection molding process of alumina parts and sintering to produce porous material which is possible to use as a preform for infiltration by aluminium alloys.

2

Qualitative and numerical analysis of chemical composition of selected iron alloys technique wave dispersive spectrometry (WDS) by calibration curves

Pawlyta M., Krzysteczko J., Nieradka B.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 66, nr 1

20--30

EN

Purpose: Purpose of the dissertation was accomplish qualitative and quantitative analysis of chemical composition of selected iron alloys using wavelength-dispersive spectroscopy (WDS) by calibration curve method. In this dissertation information about X-ray microanalysis physical basis and about X-ray detection in scanning electron microscope were presented. Design/methodology/approach: Research was execute on scanning electron microscope, on the X-ray diffraction instrument, on energy and wavelength-dispersive spectrometer. Carbon content and confidence interval at unknown steel sample were determined. Findings: Method of calibration curves allowed the designation of the carbon content of the steel samples of unknown chemical composition, depending on a reflection intensities derived from coal. Performed tests have confirmed the possibility of using this method, even in case of depositing the carbon layer. Originality/value: The paper presents qualitative and numerical analysis of chemical composition of selected iron alloys technique wave dispersive spectrometry (WDS) by calibration curves. Carbon content and confidence interval at unknown steel sample were determined.

3

Ceramic injection moulding process of alumina

Matula G., Krzysteczko J., Lipowska B.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 67, nr 1

32--38

EN

Purpose: The aim of this research is presented ceramic injection moulding process of alumina parts. Firstly alumina parts was performed by using binder system. The binder consisted of a mixture of a polypropylene (PP), paraffin wax (PW) and stearic acid (SA). Design/methodology/approach: The volume fractions of powder in the feedstocks were changed from 40-50%vol and the volume of polypropylene were changed from 20-34%vol The concentrations of SA were kept at 6%vol. Secondly the feedstock was heated to melt the binder and injected into a mould. Thirdly the polymeric and wax binder was debinding by using solvent and thermal debinding. The thermal cycle was performed based on the results of the thermogravimetric analysis. Previously samples were sintered in one cycle with debinding of the binder during 23 h at 1400°C using heating rates of 0.5°C/min. Findings: Thermogravimetric analysis (TGA) was performed to determine decomposition temperatures of polypropylene, paraffin and stearic acid. Morphology of alumina powder by scanning electron microscopy (SEM) was disclosed. Originality/value: The paper presents ceramic injection moulding process of alumina parts for selected samples.