Abstract
Low-melting glass-crystalline materials with a low temperature coefficient of linear expansion (TCLE) are widely used in various engineering fields. These materials are utilized for joints, protective coatings, additives in sintering of ceramic materials, including as matrices for high-strength dispersion-reinforced materials based on oxygen-free silicon compounds. This paper presents the results of a study on glass-crystalline materials in the pseudo-binary spodumene–manganese cordierite system. Based on experimental data, a fusibility diagram was constructed. Crystalline phases formed during the cooling of the glass melts were identified using X-ray phase analysis and their crystallization tendency was evaluated. It was found that the crystallization ability of the glasses decreases with an increasing content of manganese cordierite. The most promising, low-melting glass composition was identified, with a LiAlSi2O6:Mg2Al4Si5O18 ratio of 30:70 wt.%. The glass formation temperature for this compostion lies in the range of 1200–12500C, and the practical melting temperature is 14500C. The synthesized glass exhibits softening and intensive crystallization onset temperatures of 7600C and 9600C, respectively. The TCLE of the glass is 34.910–7 0С–1. The primary crystalline phase, -spodumene, forms bundles of needle-like crystals 10–15 m in length within the residual glass phase, reducing the material’s TCLE to 20.910–7 0С–1. The developed material shows potential as a glass-crystalline binder for producing high-strength ceramic materials (wear-resistant and impact-resistant) based on SiC and Si3N4 with reduced sintering temperatures.
Published Version
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