Download Free Investigation Of The Effects Of Temperature On Physical And Mechanical Properties Of Monolithic Refractory Made With Pozzolanic Materials Book in PDF and EPUB Free Download. You can read online Investigation Of The Effects Of Temperature On Physical And Mechanical Properties Of Monolithic Refractory Made With Pozzolanic Materials and write the review.

In recent years, scientific studies are carried out to find new refractory material. Having good mechanical properties under very high temperatures, refractories are widely used in industries like iron, steel, glass, cement and pottery. Researches are focused on monolithic refractory making because of their superior properties comparing to conventional firebrick refractories. Providing a mono-block body, having no joints makes the monolithic refractories more durable at elevated temperatures. Easier production and installation are two main points that people are choosing monolithic refractories, thus an economy is made. In this study, for monolithic refractory production, high alumina cement was used as binding material. It is known that the increase in alumina (Al2O3) content increases the high temperature resistance, so that crushed firebrick, having 85% Al2O3 was used as aggregate. Pozzolanic materials, which are silica fume, fly ash, ground granulated firebrick and ground granulated blast furnace slag, were added to improve physical and mechanical properties of mortar. With the addition of steel fibres, change in compressive strength and flexural strength was observed. Superplasticizer was used to understand its behaviour under high temperatures. Portland cement containing mortars were also prepared to make comparison with high alumina cement containing specimens. Specimens were prepared in 5x5x5 cm and 4x4x16 cm prisms. They were cured for one day at curing room, then heated to 105°C and then heated to 1100°C. Weight, size and ultrasound velocity change, compressive strength and flexural strength tests were done to determine physical and mechanical properties of the monolithic refractories, before and after heating. Heated and non-heated specimens were pulverized for microstructural investigation with X-Ray diffraction (XRD) method. Using high alumina cement with 50 6 60 % granulated blast furnace slag or granulated firebrick, by the weight of cement, and crushe.
There is interest in studying the mechanical properties of refractory metals as functions of temperature, taking into account such factors as the admixtures content, structural state, and the deformation rate. In this report an attempt is made to generalize the available data on the effect of the temperature and the above-listed factors on the mechanical properties of refractory metals of the VA (V, Nb, and Ta) and VIA (Cr, Mo, and W) groups. A large portion of the experimental data used for this purpose was obtained on specially developed equipment permitting research to be carried out on extension in the -196 to 2600C temperature range and the rate of deformation to be varied in a wide range. (Author).
An apparatus is described for preparing 9-in.long Mo crystals by floating-zone electronbombardment melting. An assessment was made of the effects of (a) q ality of starting material, (b) speed of growth, and (c) molten zone size on crystal perfection and purity. Three etchpit techniques for revealing dislocations and sub-boundaries in, Electron bombardment, Microstructure, Solid state physics, Refractory materials, Lattices, Deformation. An apparatus is described for preparing 9-in.long Mo crystals by floating-zone electronbombardment melting. An assessment was made of the effects of (a) q ality of starting material, (b) speed of growth, and (c) molten zone size on crystal perfection and purity. Three etchpit techniques for revealing dislocations and sub-boundaries in Mo; (a) chemical etching in potassium ferricyanide-sodium hydroxide, (b) electro-etching in sodium hydroxide, and (c) electro-etching in oxalic acid, have been investigated. All of the technique appear to give the same sub-boundary configurations, but etching treatments (c) produces more random etch-pits than the treatments (a) and (b). Comparative creep tests were made at 1000 C on asgrown and polygonized beam-melted Mo crystals. (Author).