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Preparation method of Li-Al-Si porous microcrystalline glass

A porous glass-ceramic and fast technology, applied in the field of preparation of Li-Al-Si series porous glass-ceramic, can solve the problems of single crystal structure and complicated preparation process, and achieve good thermal stability, simple process, ultra-low temperature Effect of Thermal Expansion Coefficient

Active Publication Date: 2015-09-02
XI AN JIAOTONG UNIV
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  • Application Information

AI Technical Summary

Benefits of technology

This new type of ceramic material called LixA2O4 can be made through an initial step where certain materials like silicon dioxide or calcium hydroxyapatite were added together beforehand into a mixture containing other raw ingredients such as sodium bicarbonate during production. These starting components react quickly at very specific temperatures while maintaining their shape when held over long periods under controlled conditions. Afterwards these mixtures solidify naturally forming tiny particles known as foams which help create small holes within them. They have excellent physical and chemical resistance compared to previous methods used previously due to its low thermal expansivity and stable structure.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to make porous ceramics from existing starting materials without requiring transformation steps like melting or bubbling agents.

Method used

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  • Preparation method of Li-Al-Si porous microcrystalline glass
  • Preparation method of Li-Al-Si porous microcrystalline glass
  • Preparation method of Li-Al-Si porous microcrystalline glass

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with specific embodiments.

[0019] (1) According to the formula ingredients in Table 1, LiO 2 , K 2 O, CaO 2 , Na 2 O is introduced in the form of Na 2 CO 3 ,K 2 CO 3 , Ca 2 CO 3 , Na 2 CO 3 , The grade of raw materials is experimental grade analytical grade, mixed evenly by ball milling, the ball milling medium is absolute ethanol, and the ratio of balls, materials, and medium is 2:1:1.

[0020] (2) The mixture is loosely packed into the crucible, and sintered with the process parameters in Table 2 in an air furnace to induce SiO 2 with Li 2 CO 3 The reaction between releases CO 2 The molten glass body is formed, and the mixture of glass liquid and gas forms a porous structure. The porous structure is retained during the cooling process, and a small amount of crystals are produced in the glass through phase separation. The porous glass-ceramic obtained at this stage has a pore...

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Abstract

The invention discloses a preparation method of Li-Al-Si porous microcrystalline glass. The method is characterized in that by quickly heating to glass transition temperature and performing short-time thermal insulation in an original oxide and carbonate introduction mode, CO2 gas generated by reaction is uniformly distributed in the molten glass to obtain the porous microcrystalline glass comprising three seed structures, including lithium aluminosilicate (LiAlSi3O8), lithium disilicate (Li2Si2O5) and lithium metasilicate (Li2SiO3); and a secondary heat treatment mode is utilized to regulate the variety of the crystals inside the glass and enhance the crystal content, thereby preparing the porous microcrystalline glass product capable of satisfying the operating requirements, wherein the pore size is adjustable within the range.

Description

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Claims

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Application Information

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Owner XI AN JIAOTONG UNIV
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