Author:
,Logvinkov S.M.,Borysenko O.M., ,Ivashura A.A.,Shabanova H.M.,Shumejko V.M.,Korohodska A.M.,Tsapko N.S.
Abstract
In this article, the mechanism of sintering of Al2O3 in the presence of small amounts of Na2O and CaO was investigated. Based on the results of the electron microscopy, the granulometry and morphological features of the particles of the studied alumina were established. The uniform nature of the distribution of sodium-containing phases was revealed, in contrast to silicon-containing ones, and the dislocation of submicron particles from calcium-containing phases was determined mainly on the basal planes of relatively large corundum particles. It was shown that such an arrangement of calcium-containing phases promotes the formation of a dense layered microstructure during sintering, especially in the presence of -alumina. The general pattern of the branched mechanism of the reaction phase formation during the sintering of the compositions in the Na2O–СаО–Al2O3 system was illustrated by a diagram explaining the trend of physicochemical processes and the feasibility of using specific types of dispersed alumina for technologies of corundum products and refractory concretes with different contents of aluminous cements.
Publisher
SHEI Ukrainian State University of Chemical Technology
Reference7 articles.
1. 1. Pilli V, Sarkar R. Carbon sources for alumina-carbon functional refractories: an overview. Emerg Mater Res. 2020; 9(2): 308-316. doi: 10.1680/jemmr.19.00118.
2. 2. Fernando ED, Korda AA. Effect of aluminum and silicon antioxidants addition on porosity, cold crushing strength, wear resistance and hydration effect of alumina spinel refractories. IOP Conf Ser Mater Sci Eng. 2019; 547: 012008. doi: 10.1088/1757-899X/547/1/012008.
3. 3. Chaplianko SV, Nikichanov VV. Influence of reactive alumina type on the properties of corundumspinel castables (review). Scientific Research on Refractories and Technical Ceramics. 2021; 121: 103-112. doi: 10.35857/2663-3566.121.11.
4. 4. Tang H, Jiang N, Yuan W, Deng C, Zhu H. Effects of fine composite powders addition on properties of corundum-spinel refractory castables. In: Han Y, editor. Advanced Functional Materials. CMC 2017. Singapore: Springer; 2018: p. 555-562. doi: 10.1007/978-981-13-0110-0_61.
5. 5. Primachenko VV, Kryvoruchko PP, Mishnyova YuYe, Syniukova YeI, Kuz'menko AN. Issledovanie sostava shikhty, vida zerna i kolichestva razzhizhayushchikh dobavok na svoistva vibrolitovykh krupnogabaritnykh khromoksidnykh ogneuporov iz zernistoi massy dlya proizvodstva pechei steklovolokna Research on influence of grain composition of bland, quality and quantity of sispersants on properties of vibrocast large dimensions chromic oxide refractories from grainy masses for fiberglass manufacturing furnaces. Zb Nauk Pr VAT "UkrNDIVohnetryviv imeni A.S. Berezhnogo". 2009; 109: 3-9. (in Russian).