Investigation of the effect of vacuum on the curing of mixtures on a silicate binder

The article presents the results of a study of the effect of vacuuming on the curing processes of liquid‑glass mixtures. The method of conducting experiments using an original laboratory vacuum installation and the mechanisms of curing a liquid‑glass mixture with various hardening methods are described. Studies have shown that vacuuming can signifi antly accelerate the curing and increase the strength of the mixture while reducing the content of the silicate binder. This; in turn; facilitates the knockability of liquid‑glass mixtures and expands the prospects for using these environmental friendly mixtures in foundry as an alternative to sands based on organic binders.

Variation in Heat Deflection Behaviour of Alkali Treated and Untreated Hybrid Fibre Reinforced Composites

Regular Fiber fortified composites discovers place in numerous applications as they have the benefits of being light, solid, modest and progressively ecological well disposed. This investigation planned to decide the impact of antacid treatment on normal fiber and its effect on the warmth diversion conduct of the regular and glass fiber fortified cross breed composites ,in this work two kind of half and half composite are made with glass, sisal and flax fiber ,the crossover strengthened composite covers were manufactured by hand lay-up technique. Examples are cut from the manufactured cover and their warmth diversion conduct was tried by ASTM D648 benchmarks. From the outcome it is comprehended that the basic treatment has improved the warmth avoidance withstanding limit of flax/glass half and half composite and don't have much impact on sisal/glass mixture composite.

An Experimental Investigation on Segregation Process of Binary Materials Based on Various Vibration Conditions

The mixing and segregation process of binary steel-glass mixture within a vertically vibrated containerat different frequencies are investigated in this paper. The image processing techniques areemployed to track the convection flow of granular materials.Six different amounts of frequency (20, 25, 30, 35, 40, and50 Hz) for certain amplitudes are used to study the effects of miscellaneous vibration conditions on the velocity fields of moving beads.The results show that increasing frequency with constant amplitude has a positive effect on increasing the velocity movement of the beads in addition, the decreasing of amplitude at almost constant dimensionless vibrational acceleration cause the velocity movement of the beads to be increased.The granular bed was divided into three horizontal parts and a separate study was provided for each one.

An Experience of a Liquid Glass Mixture Using for AlpHaset Process in Russia

The features of a technology application AlpHaset process in Russia are considered, as well as the requirements imposed on the used materials, especially to forming sand, the reasons, which lead to searching for the technology, eliminating defects of this process, and the capability of using resins and hardeners of the Russian fabricator. The question about the opportunity of substitution of resin for liquid glass for this process was elaborated. The experience of AlpHaset technology process was learned, with the usage of a liquid glass, the extent of a regeneration of such a mixture at the factories of Russia was also studied. Laboratory studies were done and recipe of the mixture was created for AlpHaset process, where a resin is completely replaced with a liquid glass. At the same time, the work on receiving a reclaim from an aged dump of liquid glass mixture, which could serve as a substitute of fresh sand in a compounding for AlpHaset process, was completed. As the result, there was created and embedded a recipe of a mixture, where the reclaim (which is completely replacing fresh forming sand), received from aged dumps of traditional liquid glass mixture for process CO2, was used. The compounding of forming a mixture began to look as follows: a reclaim of liquid glass mix, a reclaim from the line, a liquid glass, and hardener.

Improvement of efficiency of use of liquid-glass mixtures. Part 4. Combined strengthening

Technological methods applied for intensification liquid-glass mixture hardening process are described. Influence of physical and chemical processes at liquid-glass mixtures technological properties are examined. The application of combined methods of hardening the mixture is proposed, as well as examples of such technological processes are given. The effect of combined methods on the technological properties of the mixture is described. The need for more hard research in this area is justified

Porous formation process of granules from man-triggered raw materials

The results of studies of porous structure formation in a granular glass mixture are presented. Raw mixes were prepared from glass cullet, waste of magnetite ores dressing and liquid glass. The reason for adding of magnetite ores waste to the glass mixture was the information on chemical and mineral composition, results of studies of thermal transformations of waste. The rationale for adding of 20 – 30% of magnetite ores waste into the raw mix is confirmed by lowering the bloating temperature and increasing granules porosity. The effect of pyrite mineral on structural transformations in a glass mixture has been studied for the first time. It was revealed that the presence of pyrite up to 10% in the glass mixture intensifies swelling at lower temperatures. A method for preparing a molding mixture is proposed, which ensures the formation of highly porous granules with equal distribution of cells in the structure. The method involves mechanical activation of mixture of glass cullet and magnetite ores waste by grinding in a vibratory mill and subsequent portion-wise introduction of the activated mixture into liquid glass. A complex of technological methods allows obtaining porous granules with a packed density of 300 kg/m3 at a temperature of 825°C.

Reentrance in an active glass mixture

Adding a driven, active component to a model spin glass system leads to dramatic shifts in the phase diagram and the emergence of a reentrant glass transition.