Showing papers on "Geopolymer published in 1993"

Low-density inorganic moulding and process for producing it

Abstract: The description relates to a process for producing light, at least largely inorganic mouldings with a density < 400 kg/m3. To this end a light microporous filler with a powder density < 150 kg/m3 is bonded with a geopolymer. The fillers used are, in particular, blown perlite and vermiculite. The geopolymer is produced by a stone-forming component, especially an oxide mixture containing silicon and aluminium oxides and an alkaline silicate solution as the hardener. The moulding compound consisting of the stone-forming component, the microporous filler and the hardener is poured into a possibly heated mould, pressed with a reduction in volume and removed from the mould after less than 3 min. The mouldings obtained contain a continuous phase of geopolymer with a dispersed phase of the light, microporous fillers. The mouldings have excellent resistance to temperature variations, a high temperature resistance, light weight and low heat conductivity.

Advances in ceramic-matrix composites

Abstract: Ceramic Fibers. Poly[(Alkylamino)Borazine]-Derived Boron Nitride Fibers for Composite Applications (S. Bernard, S. Duperrier, F. Chassagneux, D. Cornu, and P. Miele). Processing. Multilayered Materials by ICVI in Non-Oxide Self-Healing Ceramic Matrix Composites for High Temperature Applications (L. Vandenbulcke). Processing of Oxide/Oxide Composite Components for Efficient Energy Conversion Applications (C. Kaya). From Polysaccharides to SiSiC Composites by 3D Printing (N. Travitzky, K. Zimmermann, R. Melcher, P. Greil). Characterization. Ultrasonic NDE of Reaction Bonded Ceramics (P.G. Karandikar and M.K. Aghajanian). On the Use of Digital Image Correlation to Analyze the Mechanical Properties of Brittle Matrix Composites (F. Hild, J.-N. Perie, J. Lamon and M. Puyo-Pain). Multiscale X-ray CMT of C/C Composite Preforms: A Tool for Properties Assessment (O. Coindreau, G.L. Vignoles and J.-M. Goyheneche). Microstructural Investigations of Reinforcing Materials in Zinc Phosphate Composites (C.A. Weiss, Jr., H. Benitez, M.C. Sykes and P.G. Malone). Oxide Composites. High-Temperature Thermal Conductivity of Alumina-Reinforced Zirconia Composites (N.P. Bansal and D. Zhu). Dielectric Behavior in Ni0.93Co0.02Mn0.05Fe1.95O4-delta + PZT Composites (S.V.Suryanarayana, S.N. Babu and T. Bhimasankaram). Mechanical Properties. Interlaminar Tension/Shear Properties and Stress Rupture in Shear of Various Continuous Fiber-Reinforced Ceramic Matrix Composites (S.R. Choi and N.P. Bansal). Fatigue Behavior of NextelTM720/Alumina (N720/A) Continuous Fiber Ceramic Composite - Effects of Temperature and Steam Environment (C.A. Eber, M.B. Ruggles-Wrenn, and S. Mall). Microstructure and Mechanical Properties of Polymer-Derived Al2O3-SiC Micro-Nano Composites (D. Galusek, J. Sedla ek, and R. Riedel). High Temperature Creep of Yttria Tetragonal Zirconia Nanocrystals: The Role of Yttrium Segregation at the Grain Boundaries (C. Lorenzo, D. Gomez, A. Dominguez, and J. Routbort). Creep-Rupture Behavior of NextelTM720/Alumina (N720/A) Continuous Fiber Ceramic Composite - Effects of Temperature and Steam Environment (L.B. Harlan, M.B. Ruggles-Wrenn, and S. Mall). Damage Morphology of C/C-SiC Composites under Impact Tests (V.K. Srivastava). Geopolymers and Geopolymer Matrix Composites. On Mix Compositions of Fly Ash Based Inorganic Polymeric Materials (P. Sun and H.-C. Wu). Nanostructural Design of Multifunctional Geopolymeric Materials (P. Duxson, G.C. Lukey and J.S.J. van Deventer). Thermal Conversion and Microstructural Evaluation of Geopolymers or "Alkali Bonded Ceramics" (ABCs) (M. Gordon, J. Bell, and W.M. Kriven). Disposition of Water in Metakaolinite Based Geopolymers (D.S. Perera, E.R. Vance, K.S. Finnie, M.G. Blackford, J.V. Hanna, D.J. Cassidy, and C.L. Nicholson). High-Temperature Deformation of a Geopolymer (F. Gutierrez-Mora, A. Dominguez-Rodriguez, K.C. Goretta, D. Singh, J.L. Routbort, G.C. Lukey and J.S.J. van Deventer). Modeling Si/Al Ordering in Metakaolin-Based Geopolymers (J.L. Provis, P. Duxson, G.C. Lukey and J.S.J. van Deventer). Matrix and Interphase Design of Geopolymer Composites (B. Nair, Q. Zhao, T. Rahimian, R.F. Cooper, and P.N. Balaguru).

Low-density inorganic composite material and production process

Abstract: For producing particularly lightweight inorganic insulating materials or insulating elements to be formed therefrom, preferably for the off-peak power storing sector or for electrical equipment, a coating comprising a mixture of lightweight fillers and an inorganic hardener with a geopolymer is provided for stabilising the layer of pyrogenic salicic acid, the layer and the coating being intensively bonded by, in particular, the pressing operation. Mouldings produced in this way have a relatively high strength, in particular high compressive strength, and a favourable average pore size. Shrinkage does not occur, in particular not even in the region of the layer and coating interface, specifically not even under considerable exposure to alternating temperatures.