Application of MDO technology for internal combustion engines

The prospects of using nano-crystalline ceramic coatings on internal combustion engine parts obtained by micro-arc oxidation (MDO) technology are considered. The tendency of development of engine building on replacement of cast-iron blocks and sleeves on aluminum with the special coverings received by galvanic methods is shown. It is noted that this direction does not involve the use of repair technologies, which significantly affects consumers. Analysis and practical tests have shown the possibility of using MDO technology both in the manufacture of engine parts and for the performance of restoration work. It is concluded that it is necessary to introduce this technology into the mass production of engines and pistons, as well as the need to develop a set of equipment for repair work.

Applications of ceramics in composite protective structures

Object and purpose of research. The object of the study is ceramic-containing protective structures. The purpose of the study is to substantiate the feasibility and effectiveness of using ceramics as part of standard ship structures for protection against the effects of high-speed damaging elements. Materials and methods. Composites of the "ceramic + steel", "ceramic + fiberglass" type, made with the use of poly-crystalline ceramic materials based on boron carbide, nitride and silicon carbide, aluminum oxide and some other types, are considered. The study is based on an analytical approach, the results of ballistic tests of ceramic-containing composites and computational collapse simulation of ceramics in the composition of armor structures. Main results. The results of experimental studies demonstrating the level of efficiency of ceramic-containing structures are presented. The influence of the fragmentation features of various types of ceramics on the ballistic robustness of protective structures is shown. Structural and technological solutions aimed at increasing the survivability and ensuring the mounting of ceramic-containing structures on the ship are presented. Conclusion. The high efficiency of ceramics use in ship structures for protection against the impact of high-speed damaging elements is demonstrated. The use of ceramics in protective structures allows to get a significant increase in the ballistic robustness of structures while ensuring their ballistic survivability.

Dielectric and Optical Spectroscopy of New Poly-Crystalline Ceramic for device Applications

The polycrystalline double perovskite Li2GdFeTiO6 was synthesized through solid-state mixed oxide method and its preliminary crystal structure was investigated by XRD technique. The structure of the material was identified to be tetragonal with space group P4bm using POWD and MATCH software. The morphology of the sample was investigated through a scanning electron microscope (SEM) and the average grain size was found 3.82 µm using intercept technique. The investigation of the perovskite phase and various vibrational modes were carried out through FTIR spectroscopic technique. The band gap (Eg = 1.73 eV) and visible light sensitivity of the material were identified by UV-Visible spectroscopic operation carried in the range 200–700 nm. The dielectric and related properties were investigated as a function of frequency and temperature using an impedance analyzer (LCR meter). Room temperature dielectric investigation suggests it may be useful for storage application. The transport activities investigated through conductivity, impedance and modulus technique illustrate the significant influence of grains on transportation of charges.

The Flexural Strength of Concrete Panels with Crystalline Ceramic Waste Aggregates

Increased development has an impact on increasing material requirements and environmental pollution due to waste. Material needs must consider the energy-saving aspects and the thought of useless material to be useful, one of which is a crystalline ceramic waste. The crystalline ceramic waste is very sharp and hard. The utilization of crystalline ceramic waste as a concrete panel material is very important to reduce environmental pollution. The purpose of this research was to utilize crystalline ceramic waste as a concrete panel material and test its flexural capacity. Panel testing was carried out on specimens measuring 30 mm x 400 mm x 800 mm assuming the panel as a deep beam on simple support. Testing is done by a three-point bending flexural test method. Loading is carried out monotonically until the panel collapses. From the results of the ceramic concrete panel test showed that the flexural strength increased by 31.89% compared to the flexural strength of normal concrete panels.