Abstract. The possibility of foam glass production by means of one-stage technology based on the natural tripoli and technogenic silica is determined. 45 % sodium hydroxide solution is used for the synthesis of foam glass. The addition of microsilica as an extra component in an amount of 10 to 50 wt. % in batch component increases the strength of the obtained material to 4 MPa and reduces foaming temperature from 870 to 830 °C. The increased mechanical strength of the material is due to the residual quartz dissolution and cristobalite crystallization. The samples obtained from batch with 30 wt. % microsilica have maximum strength.
Geopolymers are high-performance, cost-effective materials made from industrial waste that ideally fit the needs of 3D printing technology used in construction. The novelty of the present work lies in the investigation of methods to mix geopolymer concrete from fly ash (FA) class F, ground granulated blast furnace slag (GGBS), and raw calcined kaolin clay (RCKC) to determine the mixing procedure which provides the best mechanical strength and structural integrity. The experimental results show that aluminosilicates with different reaction parameters when mixed one after another provide the optimal results while the geopolymer concrete possesses the highest compressive strength and the denser structure. The results demonstrated that the reactivity of GGBS, FA, and RCKC increased for different depolymerization speeds of the selected aluminosilicates. This research will provide results on how to improve the mixing order for geopolymer synthesis for 3D printing demands. The highest compressive strength and denser structure of geopolymer concrete is achieved when each type of aluminosilicate is mixed with an alkaline medium separately.
The aim of this work is to improve the known methods of forming coatings on titanium implants: anodizing, plasma spraying, and ceramic one. For this purpose we use hydroxyapatite (HA) obtained from biological raw materials by roasting technology that preserves the microstructure of natural HA. The sol-gel method has been used to impart bioactivity to anodic coatings. In addition, criteria for evaluating the effectiveness of the methods for forming coatings, based on analysis of author data and expert opinions, are proposed. The evaluation of the methods used in this paper is presented.
Для получения однородных керамических материалов, синтезированных путём горения ферросиликоалюминия (ФС65А15) в атмосфере азота предложено использовать исходные образцы в форме полого цилиндра с газопроницаемыми стенками. Проведено сравнительное сопоставление результатов, подтверждающих влияние формы исходного образца ферросиликоалюминия на степень однородности конечного продукта. Показано, что при горении в атмосфере азота образцов продукт состоит из фаз
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