Browsing by Author "Karunaratne, B.S.B."
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Item Clay-polymer nanocomposites : Investigation of their electrical, mechanical, thermal and green catalytic properties for industrial and technological applicationsWijeratne, S.; Rajapakse, R.M.M.Y.; Rajapakse, R.M.G.; Karunaratne, B.S.B.; Bandara, H.M.N.; Tennakoon, D.T.B.; Bandara, B.M.R.Item Creep deformation of glass ceramic composite materials(1993) Karunaratne, B.S.B.; Ekanayake, P.Item Creep deformation of silicon carbide fibre reinforced lithium aluminosilicate (LAS) and Calcium aluminosilicate (CAS) glass ceramic compositesTennakoon, T.M.T.N.; Karunaratne, B.S.B.Item Effects of environment pH on slow crack growth in Porcelain ceramics(1991) Abeyweera, S.M.S.; Karunaratne, B.S.B.Item Electrical properties of zircon ceramics doped with different dopants(University of Peradeniya. Peradeniya, 2002) Dahanayake, U.; Karunaratne, B.S.B.Item Extraction of zirconia from zircon sand(1993) Karunaratne, B.S.B.; Ekanayake, P.; Tennakoon, T.M.T.N.Item High Temperature creep behaviour of ceria-satabilized zirconia ceramics(1991) Abeyweera, S.M.S.; Karunaratne, B.S.B.Item High temperature creep of a Si3N4 ceramic prepared by hot isostatic pressing(1990) Karunaratne, B.S.B.; Karunaratne, B.A.; Abeyweera, S.M.S.Item Low temperature fired phosphate bonded clay bricks(2006) Fernando, H.D.N.S; Karunaratne, B.S.B.Item Mechanical properties and microstructure of ceramic materialsKarunaratne, B.S.B.Item Phosphate bonded clay bricks for building industry(2005) Fernando, H.D.N.S.; Karunaratne, B.S.B.Item Positive temperature coefficient resistance (PTCR) effect of barium titanate based ceramics(University of Perdeniya. Peradeniya, 1999) Karunaratne, B.S.B.; Ravirajan, P.Item A study of grain boundary segregation and determination of thickness of segregate layer of a sialon ceramic using auger spectroscopy(University of Peradeniya. Peradeniya, 1997) Karunaratne, B.S.B.This paper presents a method of analysing grain boundary chemical composition and determination of grain boundary thickness of ceramic materials by Auger Electron Spectroscopy (AES). A sialon ceramic hot pressed with Mn3O4 was used as the ceramic sample. The AES analysis of intergranular grain boundary fracture surfaces of the ceramic indicated the presence of Mn, Al, Si, O and impurity Ca at grain boundaries. The chemical profile of segregate atoms normal to the fracture surface was determined using the sputtering technique and AES analysis alternatively. The approximate thickness of the boundary layer phase was estimated from these chemical profiles and it was found to be about 15 - 20 A. This value is somewhat lager than the value (10 A) reported by high resolution electron microscopy. This is because of the presence of lager volumes of residual intergranular glassy phase at triple junctions of the ceramic and also the uncertainty in defining the boundary limits in the AES profiles. However AES may be the most suitable technique available for analyising a thin layer of boundary interface.