Метасиликат лития

Description

Lithium metasilicate Li2SiO3 is an inorganic alkali metal silicate, a salt of silicic acid H2SiO3. Class: silicates. A white crystalline substance, found in the form of powder and rhombic needle-shaped crystals. It is characterized by high heat resistance and acid resistance. Along with the solid form, aqueous solutions of lithium silicates used in coatings are on the market.

Basic Attributes

• CAS No.: 10102-24-6
• Chemical formula: H2O3Si 2Li (Li2SiO3)
• Molecular Weight: 89.97
• Appearance: white powder or rhombic needle crystals
• Melting enthalpy: 28.00 kJ/mol
• Solubility: soluble in water and alkaline solutions; insoluble in alcohols and organic solvents
• Heat and acid resistance: high

Receipt

The industrial route is the fusion of lithium carbonate with silicon dioxide. The ratio of components determines the phase composition: with an excess of carbonate, orthosilicate Li4SiO4 is formed, with stoichiometry corresponding to metasilicate, Li2SiO3.

Scope of application

• dental glass ceramics: metasilicate glass ceramics have low strength and fracture toughness and therefore are easily milled into restorations with complex geometries; after mechanical processing, it is transferred by heat treatment to lithium disilicate, which has significantly higher mechanical and optical characteristics
• glass systems, salt melts, high-temperature ceramic glazes
• flux in glazes and ceramic enamels
• anti-corrosion coatings and binders: inorganic zinc-rich paints, materials for welding production
• intermediate phase in the synthesis of lithium orthosilicate and in the compositions of high-temperature carbon dioxide sorbents

Dental direction more details

Glass ceramics based on lithium silicates are in demand due to their biocompatibility, chemical inertness, high strength and final phase fracture toughness, aesthetics, color stability and light transmittance. The technological scheme is two-stage: the workpiece in the metasilicate state is processed on a milling machine, then crystallizes into lithium disilicate. This procedure eliminates the contradiction between the workability and strength of the finished restoration.

Note on source data

In the original supplier card, the detailed description field is not filled in, and the list of synonyms is uploaded automatically, without spaces between words. The given characteristics are collected from reference sources; phase transition temperatures, density and GHS classification should be requested in the specific batch data sheet.

Storage and handling

Lithium silicates are alkaline and bind moisture and carbon dioxide in air, so the container is kept tightly closed in a dry room. When working with powder, use gloves, safety glasses and respiratory protection, and avoid dust.