Glass-ceramics and methods of making the same

A glass-ceramic and glass technology, applied in the field of glass-ceramic and its preparation, can solve problems such as difficulty in processing dental geometry

Inactive Publication Date: 2014-03-05
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid tool wear, fully densified structural ceramics such as Al 2 o 3 and ZrO 2 Machining into complex dental geometries will be difficult

Method used

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  • Glass-ceramics and methods of making the same
  • Glass-ceramics and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0185]By adding 4.77 grams of lanthanum oxide particles (obtained from Molycorp, Inc., Greenwood Village, CO) to a plastic bottle, 3.66 grams of alumina particles (obtained under the trade designation "Al6SG" from Arkansas Alcoa Industrial Chemicals, Bauxite, AR), 1.57 grams of zirconia particles (obtained from Z-Tech Inc., Bow, NH, Bow, New Hampshire) ) and 100 grams of alumina grinding media (cylindrical, 0.635 cm in height and diameter; 99.9% alumina; available from CoorsTek, Golden, CO) in Golden, Colorado (CoorsTek, Golden, CO)) to prepare Example 1.

[0186] The contents of the plastic bottle were milled at 60 revolutions per minute (rpm) for 1 hour. After milling, the milling media was removed and the powder mixture was dried in an oven at 110°C. The dried mixture was melted and cooled using laser melting together with pneumatic levitation as described in US Patent No. 6,482,758 (Weber et al.), the disclosure of which is incorporated herein by reference. The formation...

example 2-33

[0191] Examples 2-5 were prepared as described in Example 1, except that the starting composition and heat treatment temperature were varied as indicated in Table 1 below (all shown in mole %).

[0192] Table 1

[0193] example

Al 2 o 3

La 2 o 3

ZrO 2

SiO 2

CeO 2

Gd 2 o 3

Nb 2 o 5

TiO 2

HfO 2

BaO

CaO

2

62.33

22.67

15.00

[0194] 3

62.77

22.28

15.00

4

53.57

21.43

25.00

5

53.87

21.13

25.00

6

62.49

25.51

12.00

7

60.36

24.64

15.00

8

62.49

25.51

...

example 34

[0199] To a plastic bottle was added 43 grams of isopropanol, 1 gram of dispersant (obtained under the trade designation "SOLSPERSE 20000" from Lubrizol Corporation, Wickliffe, OH) and 3 grams of polyvinylpyrrolidone . Then add the following oxide powders: 36.75 g Al 2 o 3 , 31.5 g La 2 o 3 , 1.6 g Gd 2 o 3 and 30.16 g of HfO 2 . Approximately 1000 grams of alumina grinding media was added to the bottle and the contents were ground at 120 rpm for 24 hours. After grinding, a few drops of deionized water are added, which thickens the grind to a gel-like consistency. The gel-like mass was then transferred to a glass tray and dried in an air oven at 121°C.

[0200] After grinding with a mortar and pestle, a portion of the dried powder was fed into a hydrogen / oxygen torch flame to generate molten glass beads. The torch used to fuse the particles to produce molten glass beads was a bench burner (obtained from Bethlehem Apparatus Co., Hellertown, PA, under the trade designa...

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Abstract

Provided is glass-ceramics which comprises A12O3 and rare earth oxide, yttrium oxide, and / or alkaline earth oxide. Uses of the glass-ceramics include dental articles, orthodontic appliances, abrasive particles, cutting tools, infrared windows, and ceramic bearings.

Description

[0001] Cross references to related patent applications [0002] This patent application claims the benefit of US Provisional Patent Application No. 61 / 502172, filed June 28, 2011, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] While performance and durability are highly desired attributes for, for example, dental replacement and restorative work, they are not the only concerns of physicians and patients. Esthetic value or dental materials and articles as well as orthodontic appliances are equally desirable when viewed in the mouth. [0004] For example, in revision dentures and restorative dentistry, where replacement teeth or restorations are tailored to fit in or on the tooth structure, there are situations where the restoration or repair can be seen from a short distance away with the mouth open. In these cases it is therefore highly desirable that the dental material be little different from the adjacent tooth s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02A61K6/027C03C4/00
CPCC03C4/0021C03C10/00A61K6/025C03B32/02A61K6/0273C03C10/0036A61K6/822
Inventor A·Z·罗森弗兰兹J·A·谭格曼
Owner 3M INNOVATIVE PROPERTIES CO
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