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Journal Details
Format
Journal
eISSN
2083-4799
ISSN
1730-2439
First Published
23 Sep 2008
Publication timeframe
4 times per year
Languages
English

Search

Volume 10 (2010): Issue 2 (June 2010)

Journal Details
Format
Journal
eISSN
2083-4799
ISSN
1730-2439
First Published
23 Sep 2008
Publication timeframe
4 times per year
Languages
English

Search

3 Articles
Open Access

Temperature measurement using a Chx/porous silicon/Si structure encapsulated in a CO2 rich environment

Published Online: 26 Aug 2010
Page range: 4 - 10

Abstract

Temperature measurement using a Ch<sub>x</sub>/porous silicon/Si structure encapsulated in a CO<sub>2</sub> rich environment

This work reports on the possible use of microporous silicon as a temperature sensor. This work is based on previous published works [7, 8, and 9]. The device is based on hydrocarbon group (CHx) / porous silicon (PS) /Si structure. The porous sample was coated with hydrocarbons groups deposited by the plasma of methane /argon mixture. Current-voltage characteristics have been investigated as a function of temperature in the range 20°C-70°C. The results show that for a constant voltage in the range 0.7-1V, the current increases linearly with the environment temperature reaches a maximum at 70°C and then stabilizes. This result suggests that the developed structure can be used for sensing temperatures not exceeding 70°C.

Keywords

  • porous silicon
  • temperature sensor
  • carbon dioxide
Open Access

Failure analysis of the exhaust valve face in diesel marine engine

Published Online: 26 Aug 2010
Page range: 11 - 18

Abstract

Failure analysis of the exhaust valve face in diesel marine engine

The exhaust valve from marine diesel engine which was damaged after 2000 hours of service was investigated. In order to prolong the service time the valve face was cladded with cobalt base alloy using laser technique. After failure microstructural and chemical analyses reviled that cladding process was conducted improperly. The chemical composition of the clad layer was far from the designed one and what more completely inhomogeneous. As a result the valve presented different properties in different regions which led to premature failure.

Keywords

  • cobalt base alloy
  • laser cladding
  • wear
Open Access

Optimal Features of Porosity of Ti Alloys Considering their Bioactivity and Mechanical Properties

Published Online: 26 Aug 2010
Page range: 20 - 30

Abstract

Optimal Features of Porosity of Ti Alloys Considering their Bioactivity and Mechanical Properties

This article reviews the influence of porosity and pore sizes of titanium and titanium alloys, used as orthopaedic materials, on bioactivity and mechanical properties of the porous structures. The optimal features of porous titanium scaffolds allow the reconstruction and regeneration of bone tissue in load-bearing applications.

Keywords

  • bioactivity
  • mechanical properties
  • porosity
  • pore size
  • titanium
3 Articles
Open Access

Temperature measurement using a Chx/porous silicon/Si structure encapsulated in a CO2 rich environment

Published Online: 26 Aug 2010
Page range: 4 - 10

Abstract

Temperature measurement using a Ch<sub>x</sub>/porous silicon/Si structure encapsulated in a CO<sub>2</sub> rich environment

This work reports on the possible use of microporous silicon as a temperature sensor. This work is based on previous published works [7, 8, and 9]. The device is based on hydrocarbon group (CHx) / porous silicon (PS) /Si structure. The porous sample was coated with hydrocarbons groups deposited by the plasma of methane /argon mixture. Current-voltage characteristics have been investigated as a function of temperature in the range 20°C-70°C. The results show that for a constant voltage in the range 0.7-1V, the current increases linearly with the environment temperature reaches a maximum at 70°C and then stabilizes. This result suggests that the developed structure can be used for sensing temperatures not exceeding 70°C.

Keywords

  • porous silicon
  • temperature sensor
  • carbon dioxide
Open Access

Failure analysis of the exhaust valve face in diesel marine engine

Published Online: 26 Aug 2010
Page range: 11 - 18

Abstract

Failure analysis of the exhaust valve face in diesel marine engine

The exhaust valve from marine diesel engine which was damaged after 2000 hours of service was investigated. In order to prolong the service time the valve face was cladded with cobalt base alloy using laser technique. After failure microstructural and chemical analyses reviled that cladding process was conducted improperly. The chemical composition of the clad layer was far from the designed one and what more completely inhomogeneous. As a result the valve presented different properties in different regions which led to premature failure.

Keywords

  • cobalt base alloy
  • laser cladding
  • wear
Open Access

Optimal Features of Porosity of Ti Alloys Considering their Bioactivity and Mechanical Properties

Published Online: 26 Aug 2010
Page range: 20 - 30

Abstract

Optimal Features of Porosity of Ti Alloys Considering their Bioactivity and Mechanical Properties

This article reviews the influence of porosity and pore sizes of titanium and titanium alloys, used as orthopaedic materials, on bioactivity and mechanical properties of the porous structures. The optimal features of porous titanium scaffolds allow the reconstruction and regeneration of bone tissue in load-bearing applications.

Keywords

  • bioactivity
  • mechanical properties
  • porosity
  • pore size
  • titanium

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