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Method and article from aluminum oxide glass and articles made therefrom

a technology of aluminum oxide glass and articles, applied in glass making apparatus, glass reforming apparatus, manufacturing tools, etc., can solve the problem of not being able to form bulky or complex shapes

Inactive Publication Date: 2009-03-19
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method of making articles from glass by heating and cooling the glass to form a ceramic attachment to a substrate. The glass can be made from a first glass that has a unique composition and properties, including a difference between its Tg and Tx of at least 5K. The method can also involve heating and cooling a second, third, or more different glasses, each with its own unique composition and properties. The resulting article has a composite of different glass compositions and forms a strong attachment to the substrate. The method can be used to make glass articles with specific mechanical properties and can be practiced with different types of glass compositions.

Problems solved by technology

Although a large number of metal oxides can be obtained in an amorphous state by melting and rapidly quenching, most, because of the need for very high quench rates to provide amorphous rather than crystalline material, cannot be formed into bulk or complex shapes.
Generally, such systems are very unstable against crystallization during subsequent reheating and therefore do not exhibit typical properties of glass such as viscous flow.

Method used

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  • Method and article from aluminum oxide glass and articles made therefrom
  • Method and article from aluminum oxide glass and articles made therefrom
  • Method and article from aluminum oxide glass and articles made therefrom

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0128]A polyethylene bottle was charged with 27.5 grams of alumina particles (obtained under the trade designation “APA-0.5” from Condea Vista, Tucson, Ariz.), 22.5 grams of calcium oxide particles (obtained from Alfa Aesar, Ward Hill, Mass.) and 90 grams of isopropyl alcohol. About 200 grams of zirconia milling media (obtained from Tosoh Ceramics, Division of Bound Brook, N.J., under the trade designation “YTZ”) were added to the bottle, and the mixture was milled at 120 revolutions per minute (rpm) for 24 hours. After the milling, the milling media were removed and the slurry was poured onto a glass (“PYREX”) pan where it was dried using a heat-gun. The dried mixture was ground with a mortar and pestle and screened through a 70-mesh screen (212-micrometer opening size).

[0129]After grinding and screening, some of the particles were fed into a hydrogen / oxygen torch flame. The torch used to melt the particles, thereby generating melted glass beads, was a Bethlehem bench burner PM2D m...

examples 2-9

[0130]Examples 2-9 glass beads were prepared as described in Example 1, except the raw materials and the amounts of raw materials used are listed in Table 1, below, and the milling of the raw materials was carried out in 90 (milliliters) ml of isopropyl alcohol with 200 grams of the zirconia media (obtained from Tosoh Ceramics, Division of Bound Brook, N.J., under the trade designation “YTZ”) at 120 rpm for 24 hours. The sources of the raw materials used are listed in Table 2, below.

TABLE 1Weight percentBatchExampleof componentsamounts, g2CaO: 36CaO: 18Al2O3: 44Al2O3: 22ZrO2: 20ZrO2: 103La2O3: 45La2O3: 22.5TiO2: 55TiO2: 27.54La2O3: 36La2O3: 18TiO2: 44TiO2: 22ZrO2: 20ZrO2: 105BaO: 47.5BaO: 23.75TiO2: 52.5TiO2: 26.256La2O3: 48La2O3: 24Al2O3: 52Al2O3: 267La2O3: 40.9La2O3: 20.45Al2O3: 40.98Al2O3: 20.49ZrO2: 18.12ZrO2: 9.068La2O3: 43La2O3: 21.5Al2O3: 32Al2O3: 16ZrO2: 12ZrO2: 6SiO2: 13SiO2: 6.59SrO: 22.95SrO: 11.47Al2O3: 62.05Al2O3: 31.25ZrO2: 15ZrO2: 7.5

TABLE 2Raw MaterialSourceAlumina p...

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Abstract

A method of making an article from an aluminum oxide glass is disclosed. The aluminum oxide glass includes a rare earth oxide. The aluminum oxide glass has a glass transition temperature and a crystallization temperature, and these temperatures differ by at least 25K. The method includes: providing a glass in a form comprising particles, beads, microspheres, or fibers; heating the glass above the Tg such that the particles, beads, microspheres, or fibers coalesce to form a coalesced shape; and cooling the coalesced shape to form the article.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. Ser. No. 10 / 211,491, filed Aug. 2, 2002, which is a continuation-in-part of U.S. Ser. No. 09 / 922,526, filed Aug. 2, 2001, now abandoned. This application is related to U.S. 2007 / 0135290 A1 filed Jan. 15, 2007. This application is also related to U.S. Ser. No. ______ (Attorney Docket No. 56938US018) and U.S. Ser. No. ______ (Attorney Docket No. 56938US019) filed on even date herewith.FIELD OF THE INVENTION[0002]The present invention relates to a method of making an article by coalescing a plurality of the glass particles. Examples of articles include kitchenware (e.g., plates), dental brackets, and reinforcing fibers, cutting tool inserts, abrasives, and structural components of gas engines, (e.g., valves and bearings).DESCRIPTION OF RELATED ART[0003]A large number of glass and glass-ceramic compositions are known. The majority of oxide glass systems utilize well-known glass-formers such as SiO2, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C03C3/064C03B23/00C03C3/062
CPCC03B19/01C03B19/102C03B19/063
Inventor ROSENFLANZ, ANATOLY Z.
Owner 3M INNOVATIVE PROPERTIES CO
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