Yazar "Herrmann, M" için listeleme
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The design of compositions for multi-cation doped alpha-beta SiAlON ceramics by the Rietveld method
Kurama, Semra; Herrmann, M; Mandal, Hasan (Trans Tech Publications LTD, 2003)Although densification of alpha-beta-SiAlON ceramics is easier by using sintering additives, it is difficult to achieve the designed composition and therefore the mechanical properties after sintering. This is mainly due ... -
The effect of processing conditions, amount of additives and composition on the microstructures and mechanical properties of alpha-SiAlON ceramics
Kurama, Semra; Herrmann, M; Mandal, Hasan (Elsevier Sci LTD, 2002)A series of samples with yttrium alpha -SiAlON compositions and different amounts of additive has been fabricated from alpha -Si3N4, AIN, Al2O3 and Y2O3 starting powders, using gas pressure sintering and three different ... -
Improvement of elongated alpha-SiAlON ceramics by variation of the processing conditions and amounts of additives
Kurama, Semra; Herrmann, M; Mandal, Hasan (Trans Tech Publications LTD, 2002)Two types of Y-alpha -SiAlON composition, with different amounts of additional liquid phase were densified in a gas pressure sintering furnace using three different sintering cycles. One series of samples was heated up to ... -
Investigation of the phase composition and stability of the alpha-SiAlONs by the Rietveld method
Herrmann, M; Kurama, S; Mandal, Hasan (Elsevier Sci LTD, 2002)Different compositions of Y- and Nd-alpha-SiAlONs were sintered at 1825 degreesC and analysed by the XRD method. The Rietveld technique was used for characterisation of the diffraction pattern and the x value of alpha-SiAlON, ... -
Sr2+-Mg2+-doped SiAlON ceramics
Kurama, Semra; Çiğdemir, G; Mandal, Hasan; Herrmann, M (Blackwell Publishing, 2006)In the present work, multi-cation-doped (Sr2+-Mg2+) SiAlON ceramics were investigated. MgO and SrO were used in 100:0 and 50:50 molar ratios. The mixture was sintered at 1800 degrees and 1830 degrees C for 1 h in a gas ... -
Thermal stability of yittrium-and-neodymium-doped alpha/beta-SiAlON ceramics
Kurama, Semra; Herrmann, M (Belgian Ceramic Society, 2004)A series of samples of yttrium and neodymium containing alpha-SiAlON (Rx+vSi12-(m+n)Alm+nOnN16-n with R = Y, Nd) has been synthesised at different temperatures and isothermal sintering times. The Rietveld technique was ...
