A kind of preparation method of li‑al‑si series porous glass-ceramics
A technology of porous glass-ceramics and uniform mixing, which is applied in the field of preparation of Li-Al-Si porous glass-ceramics, can solve the problems of single crystal structure and complicated preparation process, and achieves good thermal stability, simple process and ultra-high temperature. Effect of low thermal expansion coefficient
Active Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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Problems solved by technology
However, during the preparation of these methods, the raw material powder needs to be transformed into a glass body at high temperature, and then corroded or foamed by adding a foaming agent. The preparation process is complicated, and the crystal structure in the formed product skeleton is relatively simple, involving Li-Al- Si-based porous microcrystalline structures are rarely studied
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[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
technical field [0001] The invention relates to a method for preparing Li-Al-Si porous glass-ceramics which can be used in filters, catalytic carriers, gas sensors and the like. Background technique [0002] Compared with conventional dense materials, porous materials have better physical and mechanical properties because of their advantages such as low density, light weight, large specific surface area, and good damping performance. It can be widely used in many occasions such as separation, filtration, air distribution, noise reduction, shock absorption, packaging, heat insulation, etc. It is a functional structural material with great application potential. Porous glass-ceramics is an important family of porous materials. Since the discovery of glass-ceramics by Stookey, a Corning company in the United States, glass-ceramics has gradually developed into polycrystalline and composite functional materials, among which Li 2 O-Al 2 o 3 -SiO 2 As an important variety in t...
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IPC IPC(8): C03C11/00C03C10/14
Inventor 王波张亚明张辉吴桐郭海霞赵美玲杨建锋
Owner XI AN JIAOTONG UNIV