Keyword: «mechanical activation»

The paper considers a promising class of polymer materials - thermoplastic vulcanizates (TPV), which have the properties of elastomers, but can be processed by advanced technology of processing of thermoplastics. The formulation and technology of producing TPV based on frost-resistant propylene oxide rubber and polypropylene modified with ultra-dispersed additives obtained by joint mechanical activation of aluminum powders or natural zeolites with a plasticizer have been developed. The structure of the materials obtained are considered by electron microscopy and DSC. It is shown that the introduction of ultra-dispersed additives leads to a significant improvement in the physico-mechanical characteristics, frost resistance coefficient and oil resistance of TPR, which is associated with better dispersion of the elastomeric phase particles and its more uniform distribution in the polypropylene matrix.

The paper presents the results of a study of polymer composite materials based on polytetrafluoroethylene (PTFE) with nanosized boron nitride with mechanical activation and ultrasonic treatment. The introduction of boron nitride with ultrasonic activation in PTFE leads to the preservation of deformation-strength properties with an increase in compressive strength by 58% and hardness by 24% compared to the initial polymer. The lowest value of the mass wear rate was obtained for the composition with ultrasonic activation while maintaining a low friction coefficient. The CLTE of composites decreases by ~2.5 times relative to the polymer matrix. It is shown that composites with ultrasonic treatment are characterized by higher mechanical and tribological properties compared to composites containing boron nitride with mechanical activation.

The results of deformation-strength, tribotechnical and structural studies of polymer composite materials (PCM) based on activated polytetrafluoroethylene (PTFE) are presented. It is shown that the addition to PTFE of 10 wt.% activated PTFE leads to an increase in tensile strength and elongation by 20–35%. The influence of the technology of mechanical activation of the polymer matrix and fillers Sibunite and magnesium spinel on the properties of PCM is investigated. The use of activated Sibunite up to 2 wt.% as a filler of the developed polymer matrix leads to an increase in wear resistance by 56 times, activated magnesium spinel up to 2 wt.% by 27 times with indicators of deformation and strength characteristics at the level of the initial PTFE.

The accumulated experience in the operation of road surfaces in the climatic conditions of the Republic of Sakha (Yakutia) shows that one of the options for increasing the period between repairs of roads is the use of a hard surface – asphalt concrete pavement on a cement concrete base. To reduce shrinkage and temperature deformations inherent in cement concretes, it is advisable to use «lean» concretes, i.e., concretes with a low binder content. The use of mechanical activation technologies in the production of «lean» concrete is an effective way to control the performance properties of building materials.

A study of hydrogen reduction of metallic manganese from iron-manganese ores of colloidal origin has been carried out. The structure of oxides and hydroxides of iron and manganese are typical structures of crystallized dispersed systems with a solid dispersed medium – colloids. The optimal temperature and gas supply rate have been experimentally selected to facilitate the course of an intensive reduction reaction. The reduction of manganese occurs sequentially from higher oxides to S.G.lower ones to pure manganese. Preliminary mechanical activation of the ore on the vibrator contributed to the complete course of the manganese reduction reaction.