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Informacje o czasopiśmie
Format
Czasopismo
eISSN
2083-4799
Pierwsze wydanie
23 Sep 2008
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

Tom 18 (2018): Zeszyt 4 (December 2018)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
2083-4799
Pierwsze wydanie
23 Sep 2008
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

5 Artykułów
Otwarty dostęp

Storage of Hydrogen in Activated Carbons and Carbon Nanotubes

Data publikacji: 03 Jan 2019
Zakres stron: 5 - 16

Abstrakt

Abstract

Activated carbons and carbon nanotube were synthesized with chemical and microwave processes of olive leaf in media with and without ultrasonic waves, and chemical vapor deposition method, respectively. The samples were characterized by x-ray diffraction, calorimetry, Brunauer, Emmett and Teller method, scanning electron microscopy/energy-dispersive X-ray, and zetasizer nano S90 instruments. The activated carbon synthesized in the ultrasonic bath had a higher surface area. The hydrogen adsorption capacity of carbon structures including activated carbons and carbon nanotube was measured as a function of pressure at 77 K. The hydrogen storage capacity of the carbon nanotube is 300% and 265% higher than the hydrogen storage capacity of activated carbons synthesized in medium without and with ultrasonic waves, respectively. Results showed the correlation between hydrogen storage capacity and specific surface area. The highest H2 storage value was obtained with carbon nanotube at 77 K. As a result, activated carbon and carbon nanotube can be used in hydrogen storage and therefore, the olive leaf can be converted into a high added value product in the energy field.

Słowa kluczowe

  • Olive leaf
  • carbon nanotube
  • activated carbon
  • hydrogen energy
Otwarty dostęp

Nanotubular Oxide Layers and Hydroxyapatite Coatings on Porous Titanium Alloy Ti13Nb13Zr

Data publikacji: 03 Jan 2019
Zakres stron: 17 - 23

Abstrakt

Abstract

The surface condition of an implant has a significant impact on response occurring at the implant-biosystem border. The knowledge of physical-chemical and biological processes allows for targeted modification of biomaterials to induce a specified response of a tissue. The present research was aimed at development of technology composing of obtaining the nanotube oxide layers on a porous titanium alloy Ti13Nb13Zr, followed by the deposition of phosphate coating. The porous substrate (porosity about 50%) was prepared by a selective laser melting of the Ti13Nb13Zr powder with the SLM Realizer 100 equipment. The nanotubular oxide layers were fabricated by electrochemical oxidation in H3PO4 + 0.3% HF mixture for 30 min. at a constant voltage of 20V. The calcium phosphate coatings were formed by the electrochemically assisted deposition (ECAD). The presence of nanotubular oxide layers with their internal diameters ranging from 30 to 100 nm was observed by SEM (JEOL JSM-7600F). The nanotubes have dimensions that facilitated the deposition of hydroxyapatite.

Słowa kluczowe

  • titanium alloy Ti13Nb13Zr
  • electrochemical oxidation
  • nanotubular titanium oxides
  • hydroxyapatite coatings
  • SEM
Otwarty dostęp

Microstructure and Mechanical Properties of Ni-WC Thermal Sprayed Composite Coatings

Data publikacji: 03 Jan 2019
Zakres stron: 24 - 34

Abstrakt

Słowa kluczowe

  • Composite coatings
  • thermal spraying process
  • Ni-WC
  • microstructure
Otwarty dostęp

Influence of Dopants on Structure of Polycrystalline Bismuth Niobate

Data publikacji: 03 Jan 2019
Zakres stron: 35 - 41

Abstrakt

Abstract

Bismuth niobate (BiNbO4) has attracted attention as a low-fired ceramics with promising microwave application potential. BiNbO4 ceramics was fabricated by mixed oxide method and sintered at temperature T<1000°C. As the sintering aids a small amount of CuO oxide was used. The crystalline structure of the ceramic samples was examined by X-ray diffraction method at room temperature. The Rietveld refinement method was used for analysis of diffraction data. As a result an influence of dopants on crystal structure of bismuth niobate (BiNbO4) ceramics was revealed. It was found that fabricated BiNbO4 ceramics adopted the orthorhombic symmetry (α-BiNbO4 phase, Pnna (52) space group). Small differences in elementary cell parameters were found.

Słowa kluczowe

  • BiNbO ceramics
  • X-ray diffraction
  • phase analysis
  • crystal structure
Otwarty dostęp

Investigation of Mechanical and Anti-Corrosion Properties of Flame Sprayed Coatings

Data publikacji: 03 Jan 2019
Zakres stron: 42 - 53

Abstrakt

Abstract

This article presents the results of an examination of the properties of thermal flame sprayed coatings produced by material in the form of four powders (two polymers: PA11 and PA12 CastoPlast, and two high purity: tin and aluminum) on the substrate of the unalloyed structural steel of S235JR grade. Investigations of coating properties are based on metallography tests (SEM and CLSM), measurement of microhardness (acc. to PN-EN ISO 6507-1:2007), anticorrosive (acc. to PN-EN ISO 9227:2017-06) and bend testing. Results demonstrate properties of flame sprayed coatings that are especially promising in the industrial applications where corrosion-resistant coating properties are required. Consequently, performed experiments show that the highest corrosion resistance is demonstrated by steel samples with a polyamide anti-corrosion system. Accelerated corrosion tests showed the lowest corrosion resistance of the tin coating system, however, they do not fully correspond to the corrosion processes in operating conditions.

Słowa kluczowe

  • Flame spray technology
  • polymer powder
  • aluminum powder
  • tin powder
  • corrosion-resistant coating
5 Artykułów
Otwarty dostęp

Storage of Hydrogen in Activated Carbons and Carbon Nanotubes

Data publikacji: 03 Jan 2019
Zakres stron: 5 - 16

Abstrakt

Abstract

Activated carbons and carbon nanotube were synthesized with chemical and microwave processes of olive leaf in media with and without ultrasonic waves, and chemical vapor deposition method, respectively. The samples were characterized by x-ray diffraction, calorimetry, Brunauer, Emmett and Teller method, scanning electron microscopy/energy-dispersive X-ray, and zetasizer nano S90 instruments. The activated carbon synthesized in the ultrasonic bath had a higher surface area. The hydrogen adsorption capacity of carbon structures including activated carbons and carbon nanotube was measured as a function of pressure at 77 K. The hydrogen storage capacity of the carbon nanotube is 300% and 265% higher than the hydrogen storage capacity of activated carbons synthesized in medium without and with ultrasonic waves, respectively. Results showed the correlation between hydrogen storage capacity and specific surface area. The highest H2 storage value was obtained with carbon nanotube at 77 K. As a result, activated carbon and carbon nanotube can be used in hydrogen storage and therefore, the olive leaf can be converted into a high added value product in the energy field.

Słowa kluczowe

  • Olive leaf
  • carbon nanotube
  • activated carbon
  • hydrogen energy
Otwarty dostęp

Nanotubular Oxide Layers and Hydroxyapatite Coatings on Porous Titanium Alloy Ti13Nb13Zr

Data publikacji: 03 Jan 2019
Zakres stron: 17 - 23

Abstrakt

Abstract

The surface condition of an implant has a significant impact on response occurring at the implant-biosystem border. The knowledge of physical-chemical and biological processes allows for targeted modification of biomaterials to induce a specified response of a tissue. The present research was aimed at development of technology composing of obtaining the nanotube oxide layers on a porous titanium alloy Ti13Nb13Zr, followed by the deposition of phosphate coating. The porous substrate (porosity about 50%) was prepared by a selective laser melting of the Ti13Nb13Zr powder with the SLM Realizer 100 equipment. The nanotubular oxide layers were fabricated by electrochemical oxidation in H3PO4 + 0.3% HF mixture for 30 min. at a constant voltage of 20V. The calcium phosphate coatings were formed by the electrochemically assisted deposition (ECAD). The presence of nanotubular oxide layers with their internal diameters ranging from 30 to 100 nm was observed by SEM (JEOL JSM-7600F). The nanotubes have dimensions that facilitated the deposition of hydroxyapatite.

Słowa kluczowe

  • titanium alloy Ti13Nb13Zr
  • electrochemical oxidation
  • nanotubular titanium oxides
  • hydroxyapatite coatings
  • SEM
Otwarty dostęp

Microstructure and Mechanical Properties of Ni-WC Thermal Sprayed Composite Coatings

Data publikacji: 03 Jan 2019
Zakres stron: 24 - 34

Abstrakt

Słowa kluczowe

  • Composite coatings
  • thermal spraying process
  • Ni-WC
  • microstructure
Otwarty dostęp

Influence of Dopants on Structure of Polycrystalline Bismuth Niobate

Data publikacji: 03 Jan 2019
Zakres stron: 35 - 41

Abstrakt

Abstract

Bismuth niobate (BiNbO4) has attracted attention as a low-fired ceramics with promising microwave application potential. BiNbO4 ceramics was fabricated by mixed oxide method and sintered at temperature T<1000°C. As the sintering aids a small amount of CuO oxide was used. The crystalline structure of the ceramic samples was examined by X-ray diffraction method at room temperature. The Rietveld refinement method was used for analysis of diffraction data. As a result an influence of dopants on crystal structure of bismuth niobate (BiNbO4) ceramics was revealed. It was found that fabricated BiNbO4 ceramics adopted the orthorhombic symmetry (α-BiNbO4 phase, Pnna (52) space group). Small differences in elementary cell parameters were found.

Słowa kluczowe

  • BiNbO ceramics
  • X-ray diffraction
  • phase analysis
  • crystal structure
Otwarty dostęp

Investigation of Mechanical and Anti-Corrosion Properties of Flame Sprayed Coatings

Data publikacji: 03 Jan 2019
Zakres stron: 42 - 53

Abstrakt

Abstract

This article presents the results of an examination of the properties of thermal flame sprayed coatings produced by material in the form of four powders (two polymers: PA11 and PA12 CastoPlast, and two high purity: tin and aluminum) on the substrate of the unalloyed structural steel of S235JR grade. Investigations of coating properties are based on metallography tests (SEM and CLSM), measurement of microhardness (acc. to PN-EN ISO 6507-1:2007), anticorrosive (acc. to PN-EN ISO 9227:2017-06) and bend testing. Results demonstrate properties of flame sprayed coatings that are especially promising in the industrial applications where corrosion-resistant coating properties are required. Consequently, performed experiments show that the highest corrosion resistance is demonstrated by steel samples with a polyamide anti-corrosion system. Accelerated corrosion tests showed the lowest corrosion resistance of the tin coating system, however, they do not fully correspond to the corrosion processes in operating conditions.

Słowa kluczowe

  • Flame spray technology
  • polymer powder
  • aluminum powder
  • tin powder
  • corrosion-resistant coating

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