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American Journal of Materials Engineering and Technology

ISSN (Print): 2333-8903

ISSN (Online): 2333-8911

Website: http://www.sciepub.com/journal/MATERIALS

Current Issue» Volume 3, Number 1 (2015)

Article

Dental Ceramics: Part I – An Overview of Composition, Structure and Properties

1Department of Prosthodontics, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India

2Department of Dental Materials, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India

3Department of Chemistry, Sasi Merit School, Bhimavaram, West Godavari, Andhra Pradesh, India


American Journal of Materials Engineering and Technology. 2015, 3(1), 13-18
DOI: 10.12691/materials-3-1-3
Copyright © 2015 Science and Education Publishing

Cite this paper:
P. Jithendra Babu, Rama Krishna Alla, Venkata Ramaraju Alluri, Srinivasa Raju Datla, Anusha Konakanchi. Dental Ceramics: Part I – An Overview of Composition, Structure and Properties. American Journal of Materials Engineering and Technology. 2015; 3(1):13-18. doi: 10.12691/materials-3-1-3.

Correspondence to: Rama  Krishna Alla, Department of Dental Materials, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India. Email: ramakrishna.a@vdc.edu.in

Abstract

Over the last decade, it has been observed that there is an increasing interest in the ceramic materials in dentistry. Esthetically these materials are preferred alternatives to the traditional materials in order to meet the patients’ demands for improved esthetics. Dental ceramics are usually composed of nonmetallic, inorganic structures primarily containing compounds of oxygen with one or more metallic or semi-metallic elements. Ceramics are used for making crowns, bridges, artificial denture teeth, and implants. The use of conservative ceramic inlay preparations, veneering porcelains is increasing, along with all-ceramic complete crown preparations. This article is a review of dental ceramics; divided into two parts such as part I and II. Part I reviews the composition, structure and properties of dental ceramics from the literature available in PUBMED and other sources from the past 50 years. Part II reviews the developments in evolution of all ceramic systems over the last decade and considers the state of the art in several extended materials and material properties.

Keywords

References

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Article

Effect of Mg on the Wear Behaviour of as-cast Al-4.5Cu-3.4Fe in-situ Composite

1Materials and Metallurgical Engineering, Bangladesh university of Engineering and Technology, Dhaka, Bangladesh


American Journal of Materials Engineering and Technology. 2015, 3(1), 7-12
DOI: 10.12691/materials-3-1-2
Copyright © 2015 Science and Education Publishing

Cite this paper:
Mohammad Sharear kabir, Tamzid Ibn Minhaj, Md Delower Hossain, ASW Kurny. Effect of Mg on the Wear Behaviour of as-cast Al-4.5Cu-3.4Fe in-situ Composite. American Journal of Materials Engineering and Technology. 2015; 3(1):7-12. doi: 10.12691/materials-3-1-2.

Correspondence to: ASW  Kurny, Materials and Metallurgical Engineering, Bangladesh university of Engineering and Technology, Dhaka, Bangladesh. Email: aswkurny@mme.buet.ac.bd

Abstract

Wear behaviour of Al-4.5 mass% Cu-3.4 mass% Fe in-situ composite with different Mg additions was investigated. The composite was produced by solidification processing whereby Al3Fe intermetallic formed in-situ in Al-Cu matrix. The percentages of iron, copper and aluminium were kept constant while varying the mass% of Mg. The microstructure of the original composite revealed needle shaped Al3Fe intermetallic phase/precipitates. These needle shaped precipitates changed to fine irregular shaped precipitates which were widely dispersed throughout the matrix as Mg additions were increased from 1.5 mass% to 4.0 mass%. The hardness of the composite also increased as Mg additions were increased. The wear behaviour of the composites was studied by performing dry sliding wear test using a pin-on-disc wear tester by varying the applied load from 5-15 N for 600 seconds and also by varying the time from 300 to 1200 seconds at an applied load of 5 N. The morphology of the worn out surface was determined by scanning electron microscopy (SEM). It is observed that as the applied load and time increases, the wear rate increases but decreases with increasing Mg addition to the composite. The wear resistance increased as hardness of the composite increased. Hence, incorporation of Mg in the Al-4.5 mass% Cu-3.4 mass% Fe in-situ composite increases the hardness and wear resistance of the material due to change in the morphology of the intermetallic phase/precipitate.

Keywords

References

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Article

Experimental Investigations towards Optimization of the Parameters for Wear Loss Quantities in A356/Al2O3 Nanocomposites

1Mechanical Engineering Department, Faculty of Engineering, Benha University, Cairo, Egypt


American Journal of Materials Engineering and Technology. 2015, 3(1), 1-6
DOI: 10.12691/materials-3-1-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
El-Sayed El-Kady, Tamer Khalil, Tarik Tawfeek. Experimental Investigations towards Optimization of the Parameters for Wear Loss Quantities in A356/Al2O3 Nanocomposites. American Journal of Materials Engineering and Technology. 2015; 3(1):1-6. doi: 10.12691/materials-3-1-1.

Correspondence to: Tarik  Tawfeek, Mechanical Engineering Department, Faculty of Engineering, Benha University, Cairo, Egypt. Email: tariktewfic@yahoo.co.uk

Abstract

Metal matrix composites (MMCs) reinforced with nano-particles which called Nanocomposites (MMNCs), are ex-tensively studied in the recent years. Nanocomposites present high strength, wear resistance, hardness and exception- al microstructure stability. The nano-particles can improve the base material in terms of wear resistance, damping properties and mechanical strength. In this paper the tribological behavior of A356/Al2O3 nanocomposites were in- vestigated at room temperatures under dry sliding conditions. The results showed that the wear rate of the A356 alloy was significantly improved by the addition of the Al2O3 nano-particles. The wear rate of the nanocomposites was re- duced to about 25% (for nanocomposites containing 5 vol.-% of nano-particles) of the wear rate of the A356 mono- lithic alloy.

Keywords

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