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INFLUENCE OF PROCESSING VARIABLES ON MICROSTRUCTURE DEVELOPMENT AND HARDNESS OF BULK SAMPLES OF TWO NOVEL CERAMICS PREPARED BY PLASMA PRESSURE COMPACTION

Gireesh, Guruprasad
http://rave.ohiolink.edu/etdc/view?acc_num=akron1144246756

Abstract Details

2006, Master of Science, University of Akron, Mechanical Engineering.
In this study, two novel ceramics, namely (a) titanium boride (TiB2) with boron carbide (B4C) and (b) hafnium boride (HfB2), were consolidated to near theoretical density using the rapid consolidation technique of plasma pressure compaction. Consolidation time, temperature and pressure of compaction exert an influence on microstructure, hardness, and the presence of internal defects in the ceramic. The microstructure of the ceramic sample, in the as-consolidated condition, was characterized by both optical microscopy and scanning electron microscopy observations. The nature, morphology and distribution of intrinsic microstructural features, processing-related artifacts and other microstructural defects are presented, and their influence on microhardness of the ceramic samples is highlighted. Image analyses of the as consolidated samples was done to determine the volume fraction of the each of the constituents with the intent of establishing the influence of sintering parameters on size, distribution, volume fraction of the constituent phases, and grain size. The magnitude and severity of residual stress induced and present in the microstructure of the Titanium Boride (TiB2)-Boron Carbide (B4C) composite upon cooling from the consolidation temperature was determined using finite element analysis. The stress levels were found to be high enough for the initiation of fine microscopic cracks. A final correlation between temperature of consolidation, composition and time for obtaining optimum favorable mechanical properties was found out. The hafnium boride powder was consolidated with different amount of carbon. The presence of carbon and its influence on microstructural development, grain size and hardness was determined and is presented and discussed. The optimum composition of carbon required for maximum density and hardness was found and reported.
Tirumalai Srivatsan (Advisor)
Engineering, Materials Science
microstructure; Titanium diboride; boron carbide; microhardness; hafnium boride; ceramic composite

Recommended Citations

Citations

  • Gireesh, G. (2006). INFLUENCE OF PROCESSING VARIABLES ON MICROSTRUCTURE DEVELOPMENT AND HARDNESS OF BULK SAMPLES OF TWO NOVEL CERAMICS PREPARED BY PLASMA PRESSURE COMPACTION [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1144246756

    APA Style (7th edition)

  • Gireesh, Guruprasad. INFLUENCE OF PROCESSING VARIABLES ON MICROSTRUCTURE DEVELOPMENT AND HARDNESS OF BULK SAMPLES OF TWO NOVEL CERAMICS PREPARED BY PLASMA PRESSURE COMPACTION. 2006. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1144246756.

    MLA Style (8th edition)

  • Gireesh, Guruprasad. "INFLUENCE OF PROCESSING VARIABLES ON MICROSTRUCTURE DEVELOPMENT AND HARDNESS OF BULK SAMPLES OF TWO NOVEL CERAMICS PREPARED BY PLASMA PRESSURE COMPACTION." Master's thesis, University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1144246756

    Chicago Manual of Style (17th edition)

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© 2006, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.