Preparation and Characterization of Alumina -Strontium Aluminate Based Composite

Madhuchhanda, Manali (2015) Preparation and Characterization of Alumina -Strontium Aluminate Based Composite. MTech thesis.



Alumina-Strontium aluminate composites were prepared by mixing of Al2O3 and Sr(NO3)2 and calcination of powder at 1100oC. The calcined powder was compacted and sintered at 1600oC . The calcined powder XRD reveal that about 7% SrO. Al2O3 has formed in-situ in Al2O3. The sintered sample had poor relative density (75% of theoretical). The sintered samples were characterised for apparent porosity, bulk density, hardness, strength and toughness. The hardness of sintered sample was 2.49 GPa, bi-axial flexural strength was 37.3 MPa and Indentation Strength on Bending(ISB) fracture toughness of 1.7 MPam1/2. SEM microstructure of the sintered samples exhibit a porous microstructure. The strontium aluminate particles were seen as bright particles in phase contrast mode. The crack path was also viewed in SEM. It was noted that the cracks either were branched on interacting with strontium aluminate or stopped. This feature indicates the possibility of producing a tough sample if proper density and homogeneous distribution of Strontium aluminate could be achieved.

Item Type:Thesis (MTech)
Uncontrolled Keywords:Alumina-Strontium, composite, toughness, microstructure
Subjects:Engineering and Technology > Ceramic Engnieering > Ceramic Processing
Divisions: Engineering and Technology > Department of Ceramic Engineering
ID Code:6866
Deposited By:Mr. Sanat Kumar Behera
Deposited On:06 Jan 2016 17:28
Last Modified:06 Jan 2016 17:28
Supervisor(s):Bhattacharyya, S

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