Fabrication and Characterization of Piezoelectric Ceramic Fiber/Aluminum Alloy Composites
Tetsuro Yanaseko,
Hiroshi Asanuma,
Hiroshi Sato
Issue:
Volume 3, Issue 4, August 2014
Pages:
22-26
Received:
11 September 2014
Accepted:
24 September 2014
Published:
30 September 2014
Abstract: This paper describes the fabrication and characterization of a piezoelectric ceramic fiber/aluminum alloy composite using the Interphase Forming/Bonding (IF/B) method. A metal-core piezoelectric ceramic fiber is very fragile and reacts with molten aluminum; therefore, general fabrication processes such as diffusion bonding and casting are difficult to apply. In this study, hot pressing conditions were examined in order to embed a metal-core piezoelectric ceramic fiber, without mechanical damage and loss of piezoelectricity, in an aluminum alloy matrix instead of the pure aluminum matrix used in previous studies. As the results, the proper hot pressing conditions, that is, pressure and temperature of 2.2 MPa and 873 K, respectively, enable the removal of the coarse and fragile eutectic alloy phase from the composite. In addition, the output voltage characteristics of the piezoelectric ceramic fiber/aluminum composite were evaluated by impact testing. The results show that the output voltage generated from the composite is proportional to the square root of impact energy.
Abstract: This paper describes the fabrication and characterization of a piezoelectric ceramic fiber/aluminum alloy composite using the Interphase Forming/Bonding (IF/B) method. A metal-core piezoelectric ceramic fiber is very fragile and reacts with molten aluminum; therefore, general fabrication processes such as diffusion bonding and casting are difficult...
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Evaluation of the Iron Ore Tailings from Itakpe in Nigeria as Concrete Material
Elinwa Augustine Uchechukwu,
Maichibi Juliana Ezekiel
Issue:
Volume 3, Issue 4, August 2014
Pages:
27-32
Received:
19 September 2014
Accepted:
27 September 2014
Published:
30 September 2014
Abstract: An evaluation of the Itakpe iron ore tailings (IOT) for concrete production has been carried out using the material to replace sand and cement, in proportions of 5 % up to 30 %, and curing for periods 90 days in water. Characterization of the material showed that it has pozzolanic properties, and can be used as a retarder for hot-weather concreting. Other characteristics of the IOT, as sand and cement replacements materials in concrete production exhibited improved workability and higher compressive strengths over the control strength with approximately 10 % and 38 % for sand and cement respectively. The linear regression models that were developed on the experimental data showed that they are significant and could be used to predict relationships of IOT-OPC concrete.
Abstract: An evaluation of the Itakpe iron ore tailings (IOT) for concrete production has been carried out using the material to replace sand and cement, in proportions of 5 % up to 30 %, and curing for periods 90 days in water. Characterization of the material showed that it has pozzolanic properties, and can be used as a retarder for hot-weather concreting...
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