Synthesis and Thermo-Mechanical Properies of Sol-Gel Derived Zironica Toughened Alumina Nanocomposite (Record no. 74163)

000 -LEADER
fixed length control field nam a22 7a 4500
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20170707111526.0
006 - FIXED-LENGTH DATA ELEMENTS--ADDITIONAL MATERIAL CHARACTERISTICS--GENERAL INFORMATION
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008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 170703b2007 xxu||||| m||| 00| 0 eng d
041 ## - LANGUAGE CODE
Language code of text/sound track or separate title eng
100 ## - MAIN ENTRY--AUTHOR NAME
Personal name Sarkar, Debasis
Roll Number/Miscellaneous information 50408002
245 ## - TITLE STATEMENT
Title Synthesis and Thermo-Mechanical Properies of Sol-Gel Derived Zironica Toughened Alumina Nanocomposite
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Year of publication 2007
300 ## - PHYSICAL DESCRIPTION
Number of Pages 146 p.
502 ## - DISSERTATION NOTE
Degree Type Thesis (Ph.D)-
Name of granting institution National Institute of Technology, Rourkela
520 ## - SUMMARY, ETC.
Summary/Abstract, etc Al<br/>2<br/>O<br/>3<br/>-ZrO<br/>2<br/> composite precursor powder containing 5-15mol% ZrO<br/>2<br/> is prepared by wet <br/>chemical route. The washed gel containi<br/>ng pseudoboehmite and amorphous zirconia are <br/>characterized with respect to DTA/TG, XRD and IR spectroscopy. In the calcined powder <br/>phase evolution of Al<br/>2<br/>O<br/>3<br/> follows the sequence: pseudoboehmite <br/>→<br/> bayerite <br/>→<br/> boehmite <br/>→<br/>γ<br/>-Al<br/>2<br/>O<br/>3 <br/>→<br/>θ<br/>-Al<br/>2<br/>O<br/>3 <br/>→<br/>α<br/>-Al<br/>2<br/>O<br/>3<br/>; while that of ZrO<br/>2<br/> follows amorphous ZrO<br/>2<br/>→<br/> t-ZrO<br/>2<br/>→<br/> (t + <br/>m)-ZrO<br/>2<br/>. However, the crystallization behavior of aluminum-hydroxide is somewhat affected <br/>with addition of zirconia. FTIR study reveal the number of M-OH and M-O bond increases on <br/>increasing mol% of ZrO<br/>2<br/> due to a change in the cationic charge of the composite powder. The <br/>formation of amorphous material before crystallization can also be predicted from TEM study, <br/>where particle exhibits different morphology; and show smooth, distinct and faceted surfaces <br/>at different temperature. A bi<br/>modal particle size distribution is observed because of both <br/>unagglomerated and partial agglomerated partic<br/>les in the range from15 to 210nm for highest <br/>zirconia content, however, the specific surface area of powder decreases with increasing <br/>zirconia content. The addition of 5wt% uncal<br/>cined precursor enhances the consolidation <br/>process. The sintered zirconia toughened alum<br/>ina nano-composite with 98% relative density <br/>has been achieved at 1550<br/>o<br/>C for 4h. The average grain size ratio <br/>d<br/>Al2O3<br/>/<br/>d<br/>ZrO2<br/> varies in between <br/>4.35 for Al<br/>2<br/>O<br/>3<br/>-5ZrO<br/>2<br/> and 2.29 for Al<br/>2<br/>O<br/>3<br/>-15ZrO<br/>2<br/>, whereas average grain size of alumina and <br/>zirconia in Al<br/>2<br/>O<br/>3<br/>-10ZrO<br/>2<br/> composite are 360nm and 125nm respectively. EPMA confirms the <br/>near uniform distribution of zirconia part<br/>icles in the alumina matrix. For homogenous <br/>dispersion of ZrO<br/>2<br/> in Al<br/>2<br/>O<br/>3<br/>, the optimum amount of ZrO<br/>2<br/> is found to be 10mol% and up to <br/>the critical amount of ZrO<br/>2<br/> addition, flexural strength and fracture toughness increase and the <br/>size of the intergranular zirconia strongly influences these properties. The room temperature <br/>fracture strength of these composite varies within ~500 to 700MPa, but drastic decrease of <br/>high temperature strength for lowest zirconia containing specimen is observed above 600<br/>0<br/>C, <br/>where transformation toughening is no longer effective. The elastic modulus and hardness, <br/>both the properties decrease with ZrO<br/>2<br/> content. Thermal shock study reveals the retained <br/>flexural strength varies with zirconia content. <br/>The hystersis effect in the dilatation curve due <br/>to t<br/>→<br/>m transformation is also influenced by the grain size of ZrO<br/>2<br/>.
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Engineering and Technology
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Ceramic Engnieering
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Zirconia
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Nanocomposites
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Ceramic Processing
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name Adak, Suumar
Relator term Supervisor
710 ## - ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Department of Ceramic Engineering
856 ## - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier http://ethesis.nitrkl.ac.in/83/
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type Thesis (Ph.D/M.Tech R)
Holdings
Withdrawn status Damaged status Collection code Permanent Location Current Location Shelving location Date acquired Accession Number Koha item type
    Reference BP Central Library BP Central Library Thesis Section 03/07/2017 T27 Thesis (Ph.D/M.Tech R)

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