Investigation of technology schemes for the production of cast composite functional materials

Obtaining and using ligatures, modifiers and deoxidizers to obtain structural alloys of a given composition and properties in metallurgy and foundry is an important production task. One of the existing developments in the field of technologies for the preparation of functional composites on a matrix basis for non-ferrous and ferrous alloys is the combination of solid filler with a melt of an active metal binder. At that, from the filler material, which is selected from the group comprising iron, nickel, titanium, silicon, boron, manganese, first a porous workpiece of a given geometric shape with a technological total pore volume is formed, then it is heated to a temperature corresponding to the liquidus temperature of the active binder, the heating being carried out in a gas inert medium, after which the heated workpiece is impregnated with the melt of this binder by forced infiltration of the melt into the pores of the workpiece under pressure, mainly by the method of liquid stamping. The task of the study was to expand the scope of use of composites, to create a single flexible universal, and at the same time, simplified technology that will provide an opportunity to obtain a wide range of diverse in composition and service characteristics of deoxidizers, modifiers and ligatures for non-ferrous and ferrous alloys. The developed technology, based on vacuum impregnation (suction) of the matrix alloy through porous filler, makes it possible to obtain new functional metal-matrix composite materials of a given composition for use as inexpensive ligatures, modifiers and deoxidizers in metallurgical processes, as well as to simplify and make their use safe. The proposed method for obtaining ligatures, modifiers and deoxidizers provides a possibility of their industrial serial production and is easy to perform, and also reduces the cost of the metallurgy product obtained with their application by increasing the effective content of active components and their more complete assimilation, which reduces the consumption of scarce and expensive materials.

Thermodynamically study of phase formation of Ni-Ti-Si nanocomposites produced by self-propagating high-temperature synthesis method

Understanding the phase formation mechanisms in self-propagating high-temperature synthesis from the thermodynamical aspect of view is important. In this study, the phase formation of the ternary system of nickel-titanium-silicon was studied by using the HSC software V6.0, and phase formation is predicted by calculating the adiabatic temperature of exothermic reaction between reagents. Then, by using X-ray diffractometer analysis, the results of the simulation were evaluated by experimental achievements. Results showed a good correlation between thermodynamical calculation and prediction with experimental. It could be concluded that the equilibrium mechanism is the dominant mechanism in phase formation in the SHS synthesis method. NiTiSi solid solution phase is obtained from the reaction between Ti5Si3 and Ni2Si and Ni.

Nanotechnology Intervention- Sugarcane Waste to Wealth: A Review

Nanotechnology is nothing but anything smaller than micro technology. Nanoparticles have been widely used because of their incredible properties such as high heat resistance and chemical inertness. They are synthesized using different metals and metalloids such as calcium, titanium, silicon, etc. In the recent years there has been increased interest on synthesis of nanoparticles using organic waste. Sugarcane bagasse is one of the green ways for synthesis of nanoparticles. Various methods can be used to obtained nano-cellulose, such as acid hydrolysis, ultrasonic technique and enzymatic hydrolysis etc. This review focuses on the how best we could use sugarcane waste material for production of nanoparticles.

Titanium–silicon ferrierites and their delaminated forms modified with copper as effective catalysts for low-temperature NH3-SCR

Titanium–silicon ferrierites with different Si/Ti ratios and their delaminated forms were modified with copper by ion-exchange.

Ternary TiO2/SiOx@C nanocomposite derived from a novel titanium–silicon MOF for high-capacity and stable lithium storage

The all-in-one TiO2/SiOx@C derived from a novel titanium–silicon MOF exhibits enhanced lithium storage performance due to the unique ternary architecture.