Crystallization-resistant glass compositions suitable for manufacturing glass frits for microreactors
A technology of micro-reactor and glass composition, which is applied in the field of preparing the glass composition of the above-mentioned glass frit, and in the field of preparing glass frit with thermal shock resistance and excellent chemical durability, which can solve the problem of powder cracking, loss of glass luster, mechanical Strength reduction and other issues
Inactive Publication Date: 2008-12-03
CORNING INC
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Problems solved by technology
As stated in U.S.2004 / 0152580A1, The problem with glass frits is that during sintering at 700-800°C they lose their vitreous luster (i.e. form crystals of different materials)
However, due to the formation of crystals with a high thermal expansion coefficient and the volume change accompanied by the crystallographic phase transition of cristobalite at about 200°C, the mechanical strength decreases
Method used
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[0036] One method of making a microreactor may be based on micro-molding a frit structure onto a substrate and then covering the frit with a suitable cover material. The method is based on the micromolding technique disclosed in U.S. Patent No. 5,853,446 (the '446 patent) for preparing shaped glass structures that are used in the formation of barrier ribs for plasma display units. Especially useful for structs.
[0037] '446 Patent's figure 2 The powder bonded (adhered) to the substrate is shown. For the preparation of microreactors, such as the application Figure 4 As shown in , two substrates are used (a first or bottom substrate and a second or top substrate) with the powder sandwiched between them.
[0038] One way to make a microreactor is to use two sintering steps to make the powder structure strong. The first sintering step or heat treatment is called "pre-sintering", and the viscosity of the powder in this step is about 1×10 10 Poise temperature for 25-40 minute...
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Abstract
The invention is directed to a glass composition that can be used to make glass frits suitable for use in the manufacturing of microreactors. The glass compositions, after final sintering to produce a finished microreactor, have a surface crystalline layer of 30 [mu]m or less, or are completely amorphous throughout. Generally, the borosilicate glasses of the invention have a composition Of B2O3 = 12-22 mol %; SiO2 = 68-80 mol % and additional components selected from the group consisting of either (a) Al2O3 = 3-8 mol % and Li2O = 1-8 mol %, or (b) K2O = 0-2 mol % and Na2O = 0- 2-ol %, except that both K2O and Na2O cannot both equal zero at the same time. One borosilicate glass has a composition, in mole percent (mol%) of B2O3 = 18-22 mol %, SiO2 = 75-80 mol %, K2O = 0-2 mol %, and Na2O = 0-2 mol %, except that both K2O and Na2O cannot both equal zero at the same time.
Description
technical field [0001] The present invention relates to non-crystalline glass frits suitable for use in the production of glass microreactors using micromolding techniques, and to glass compositions for the preparation of said frits; in particular to the preparation of glass frits with thermal shock resistance and excellent chemical properties. Durable frit. Background technique [0002] Due to economic imperatives, environmental considerations, waste disposal regulations, and other factors, activities in the field of thermal and chemical process engineering are increasingly oriented towards the use of microreactors for R&D activities including model studies and chemical reactions. In addition, microreactors have begun to be used in pharmaceutical and biological research, development and analysis. A microreactor is a device capable of performing gaseous or liquid chemical reactions in low milliliter volumes (5-10ml), unlike early laboratory "bench-top" experiments and provi...
Claims
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IPC IPC(8): C03C3/089B01J19/00B01L3/00
CPCB01J2219/00831B01J2219/00889C03C8/02B01L3/5027C03C3/093C03C3/089C03C3/091B01J19/00B01L3/00
Inventor G·P·J·马克斯R·莫伦纳H·E·哈吉
Owner CORNING INC