Glass suitable for chemically tempering and chemical tempered glass

Abstract

The invention provides silica-alumina-sodium oxide glass which is suitable for a low-temperature ion exchange process and is easy to melt. The glass is suitable for chemical tempering, and comprises the following compositions in percentage by weight: 55 to 60 percent of SiO2, 0.1 to 2.5 percent of B2O3, 11 to 16 percent of Al2O3, 14 to 17 percent of Na2O, 1 to 8 percent of K2O, 0 to 8 percent of ZrO, 0 to 5 percent of CaO, 0 to 5 percent of MgO, and 0 to 1 percent of Sb2O3. The invention, by reasonably setting the compositions, reduces the manufacturing difficulty of the glass, obviously reduces the melting temperature of the glass, and is favorable for reducing energy consumption and improving the rate of finished products of products; and under the conditions that the tempering temperature of the glass is between 380 and 500 DEG C and the tempering time is between 4 and 12 hours, the surface compressive stress of the glass can reach between 610 and 1,100MPa, the depth of a stress layer can reach between 31 and 80 mu m, and the glass is strengthened and has good shock resistance. The glass has higher wear resistance, and is suitable for protective glass materials of high-grade electronic display products such as mobile phones, PDA and the like.

Description

technical field [0001] The invention relates to a glass suitable for chemical toughening and the chemical toughened glass thereof. Background technique [0002] During the production, processing and use of glass, a large number of microcracks will be generated on the surface. The existence of these microcracks makes the actual strength of the glass much lower than the theoretical strength. Usually, it is necessary to generate compressive stress on the glass surface by adopting thermal tempering or chemical tempering. To improve the strength of glass and inhibit the expansion of surface microcracks. [0003] The chemical tempering of glass is to immerse the heated alkali-containing glass in a molten salt bath, change the chemical composition of the glass surface through ion exchange between the glass and the molten salt, and form a compressive stress layer on the glass surface to increase the strength of the glass. There are currently two types of ion exchange tempering. The...

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Problems solved by technology

CN101337770A also discloses a kind of glass for chemical tempering. Under the conditions of tempering temperature of 490°C and tempering time of 3-8 hours, the glass sample is chemically tempered. After tempering, the Vickers hardness can reach 638Mpa, but its glass A large amount of Al is added to the composition 2 o 3 , due to Al 2 o 3 The melting point of the glass is high, the viscosity of the glass increases, and the bubbles are difficult to eliminate, so Sb must be added during the melting process. 2 o 3 , SO 3 、As 2 o 3 And fluoride, can get sufficient clarification effect, the product manufacturing process is more difficult

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