The effect of time and crystallization temperature on the mechanical and physical properties of basalt scoria glass-ceramics (BGCs)

• Main Authors: Sukmana, Irza, Risano, Ahmad Yudi Eka, Tarkono, Hendronursito, Yusup
• Format: Conference Proceeding
• Language: English
• Subjects: Additives; Basalt; Bioceramics; Crystallization; Diamond pyramid hardness tests; Fracture toughness; Glass ceramics; Indentation; Independent variables; Iron; Mechanical properties; Nucleation; Physical properties; Variance analysis
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0129811

This research analyzes the holding time and crystallization temperature on basalt glass-ceramics hardness and fracture toughness (BGCs) effects. Glass-ceramics are made from scoria basalt without additives. The formation of BGCs begins with the melting process at a temperature of 1,200oC followed by a cooling treatment. Nucleation point at temperature of 600oC for 2hrs followed by crystallization at temperature variation of 850oC, 950oC, and 1,050oC. The holding time of the crystallization process for 3 and 8hrs. The micro-Vickers hardness test with an indentation load of 1N for 12 seconds. The hardness and fracture toughness (KIC) test were performed five times a repetition. Meanwhile, the fracture toughness (KIC) of BGCs was carried out using an equation approach obtained from the former indentation of the Vickers micro-test. The analysis of variance (ANOVA) showed that temperature had a significant effect and contributed 64.065 and 60.47% to hardness and KIC, respectively. Meanwhile, temperature contributes 17.67% to hardness and 18.78% to KIC. The contour plot shows the area of BGCs hardness of more than 1,800 Hv at a crystallization temperature of 900oC, withholding time for 7hrs. At KIC, the interaction area for independent variables of time and temperature that can produce a high KIC value>2.8 is the time variable 7,6hrs with a temperature between 950oC to 1,040oC. The higher of crystallization temperature and the longer of holding time caused the higher of hardness and KIC values. The mechanical characteristics of these BGCs are still not uniform due. The reduction in Fe content is required to improve the uniform mechanical characteristics of BGCs. The time and temperature of crystallization influences the formation of glass-ceramics from scoria basalt. This research can be developed as a bioceramics material.