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2 Journal of Achievements in Materials and Manufacturing Engineering

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The properties of porous TiO2TiC/C and TiC biomorphous materials

Tański T., Krzemiński Ł., Wiśniowski M.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 72, nr 2

75--84

Purpose: Purpose of this paper is to present results of the ceramization of biomorphic materials under different conditions. The aim of the study is to characterize the structure and the usefulness of the material resulting in further applications. Possibility of making a porous material made up of different phases and composition depending of high temperature process and the input material has been demonstrated. Design/methodology/approach: Pyrolisis was done on wood pine samples. Obtained char was subjected to infiltration with solution of titanium alkoxide precursor. After the process of infiltration and drying ceramization subjected in carbon-TiO2 char in three different conditions. Scanning microscopy investigation and XRD analysis were carried out. Structure and phase composition of various biomorphic materials was determined and compared. Findings: The result of the processes was to obtain various biomorphic products, for which the phase composition and chemical depending on the atmosphere participating during annealing were investigated. Research limitations/implications: Biomorphic material is deformed due to loss of integrity during the manufacturing process, which depends on the gaseous atmosphere under annealing processes. Further studies are limited by poor durability and structure easy to pulverize. Practical implications: reinforcement of composite materials, active filters, precursors to ceramic nanopowders Originality/value: comparing biomorphic material prepared under different conditions. Comparison of the porous structure of TiC/C biomorphic material with pure TiO2 after high temperature process and TiC ceramic wood.

Preparation and properties of carbon/carbon and polymer/carbon porous monolithic composites

Krzesińska M.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 1

45--53

Purpose: An overview of own works on preparation of monolithic carbon/carbon and polymer/carbon composites, that were fabricated using natural biological precursors for both composite components: carbonized plant stem for a support and chitosan or furfuryl alcohol for a filler, is presented. Composites based on monolithic porous supports prepared from expanded graphite are also discussed. Design/methodology/approach: The supports were prepared by carbonization of plants stems or by compression of expanded graphite. Next step was infiltration with the polymers, that were cross-linked on the supports. The structure and properties of the supports and the composites were characterized using numerous experimental techniques: thermogravimetry, helium gas densitometry, mercury porosimetry and adsorption of N2 gas, ultrasonic and electrical measurements, FTIR, EPR and observed with microscopes: optical, SEM and TEM. Findings: The carbon based composites were found to exhibit properties of the polymeric fillers, as well as electrical conductivity and high stiffness of monolithic carbon framework. Practical implications: The materials could be utilized as adsorbents/absorbents, catalysts supports, sensors, filters, etc. Originality/value: New class of original biodegradable bio-composites in the form of monoliths of optional shapes was obtained in contrast to adsorbents usually fabricated as granules or to composites being resins fulfilled by granules or fibres.